57 Replies Latest reply on May 12, 2020 5:54 PM by ocsav

    My lovely RaspberryPi is dead...

    gorski

      I was so looking forward to it and I was pleasantly surprised how the  RaspBMC from the NOOBS package worked, I have even bought a wireless  keyboard for it ( http://www.totalhtpc.com/logitech-k400r-wireless-touch-keyboard-review/ ) but...

       

      The problem started about a week ago, when I had to unplug  everything to get the image going, as it was all stuck. Several reboots  and it started working again but all that unplugging and plugging it  back again - maybe it was the electricity somehow damaging some of the  HDMI/composite circuitry?

       

      I can see  that it is powered up (there is red light inside) but neither HDMI, not  Composite cables give me any image whatsoever, on the TV.

       

      I  have reformatted and copied the NOOBS files to the SD card, as  described on your pages - but I get no system booting in any way. Not a  flicker of an image on my TV.

       

      The SD card seems OK, as I have dealt with it in my laptop without a problem.

       

      I also tried other OSs, like RaspBMC alone, as well as OpenELEC. Alas, to no avail. The same applies.

       

      I have tried different ports and different cables. Not a squeak.

       

      Therefore, I must conclude it is the HW that is faulty.

       

      Please, instruct me how to return the Pi to you.

       

      A refund is preferable to "repair and return", at this point. No response from "sales" at Fernell, sadly... Just forwarded it to the other email...

       

      ========================================

       

      In addition, I hope this might help a bit...

       

      I  have read that Pi  might be susceptible to varying voltage/electricity problems. I have a  Belkin safety multiple extension cord, with serious protection against  electricity surges. So, can it still be an electrical mishap?

       

      Or is it simply the power supply issue, as some here have suggested, in which case we would need a really good one, properly advertised here and on sales website...

       

      May  I also suggest a ON/OFF switch, as a good idea, which may go  a certain  way towards preventing this from occurring. I understand that it only  uses very little electricity but I think this is beside the point.  Sometimes my NAS would not go to "Standby" mode after 10 minutes as I  set it up because it seems that RaspBMC could have been queering it?

       

      Not  sure what exactly went wrong but I can see quite clearly that both HW  and SW improvements are possible. I would urge you to contact the patent  holders ASAP, in order to make the Mark III...

       

      Best regards,

       

      gorski

       

      P.S. Anyone with multiple HDMI switches experience? I have this one in my mind: http://www.amazon.it/Ligawo-%C2%AE-switch-attivo-automaticamente/dp/B002I9LH2Q/ref=sr_1_1?ie=UTF8&qid=1382270091&sr=8-1&keywords=ligawo+5x1

        • Re: My lovely RaspberryPi is dead...
          John Beetem

          I suggest going through the Power / Start-Up section of the RasPi Troubleshooting Wiki.  If you're only seeing the red PWR LED, that only tells you that your power supply is giving you at least 3V or so.  See if the green ACTivity LED is flashing solid as RasPi comes up -- that tells you the CPU is accessing the SD card.  If you're not getting ACT, it could be that the OS image was not written correctly to the SD card.  Also, if you're not getting ACT you'll see nothing on video since that requires a good OS (or at least kernel) image.

           

          I successfully use a 3-1 HDMI Switcher which looks like this one.  It automatically switches when you turn on a new input, plus there's a manual override.  I use it with a DVI-D monitor.

          2 of 2 people found this helpful
          • Re: My lovely RaspberryPi is dead...
            Colin Barnard

            Does the network LED flash when starting up?  If the green LEDs flash, the Pi itself might be OK.

             

            Have you tried a different TV?   Early on, there were reports on the Raspberry Pi forum that some televisions HDMI ports suffered an upset if the Pi was unplugged or plugged in whilst the TV set was switched on.

              • Re: My lovely RaspberryPi is dead...
                gorski

                Thank you both - I will try again but I have my suspicions... Different OSs, NOOBS twice.... hmmm....

                 

                Besides, other devices suffer no such problems, so...

                 

                I changed HDMI ports and so on...

                 

                We'll see...

                  • Re: My lovely RaspberryPi is dead...
                    gorski

                    Only the PWR red led is ON, sadly...

                     

                    Tried aother SD card, as well, with RaspBMC - nothing...

                      • Re: My lovely RaspberryPi is dead...
                        wordpress-webdesign

                        ONE POSSIBLE SOLUTION

                        FOR RASPBERRY RED LED PROBLEM -
                        NO BOOT - NOTHING WORKS!

                        @ Gor Ski

                         

                        Hi Gor Ski!

                        Since there is no answer until now for many people...and after more than 3 years I have one answer for the red led problem with the raspberry pi: I had the same problem and in the end I solved it with pure logic and a simple repair.

                         

                        Problem and situation:

                        1. the raspberry stopped working suddenly for no special reasion after months of work in perfect condition

                        2. after trying to reboot: only the red power LED was on, no blinking, no boot, no nothing nada. The device seems to be completely out of order. I did the formatting and rewriting the Image back onto the SD card with no effect. It did not play any role if I powered the device with or without a card inserted - still only the red pwr LED.

                         

                        2 relevant questions:

                        a) is it a electricial problem?

                        b) is it a mechanical problem?

                         

                        Answer to a) No!

                        because....after measuring (with connected PSU) the power at points TP2 and TP1 (or TP2 and F1) it showed up 5.1 Volts on the multimeter.

                        Seems to be OK. I always connected an old Samsung phone power supply which always worked fine (somewhat under 1000 mA or so).

                         

                        Answer to b) YES!

                        because as I discovered... the SD card housing itself was deformed due to mechanical force coming from the metal contacts (like small springs) on the PCB in combination with heat coming from the processor. As we know polymere deforms easier under the influence of heat and/or mechanical force.

                         

                        See the picture attached below! I made the illustration and a scheme to understand the cause of the "red LED raspberry pi problem".

                         

                        Explanation:

                        As the SD card is permanently inserted into the raspberry slot for several month, there a two things to remember: First of all there is a mechanical force coming from the spring like contacts on the pcb. Second there is heat from the processor that warms up the pcb and the sc card holder. So the sd card warms up and in the same time it is under  pressure of the contact's...the result is a deformation of the sd card housing and so the contacts can not fit in place.

                         

                        Conclusion: No contact - no signal flow - no boot - no nothing. It was that easy.

                         

                        Solution ################

                        Just bend the sd card slightly back into a flat shape. That may hopefully work for some time. May be a thin metal plate glued onto the sd card could prevent it from beeing deformed again... I'll see.

                         

                        GOOD LUCK for everything.

                        Andreas

                        (http://andreas-lenne.de)

                        Raspberry pi red LED no boot

                        6 of 6 people found this helpful
                  • Re: My lovely RaspberryPi is dead...
                    altairlabs

                    Gor Ski,

                    Exactly how many volts do you measure between the +5V and GND pins of the header?

                    Could be very simple, it was for me.  Originally I had 4.7 volts and many troubles like yours.  I tried several supplies and found one that gives +5.02V on the header and now mine runs for weeks.

                    Measure the voltage, tell us what you get.

                    • Re: My lovely RaspberryPi is dead...
                      smashley

                      Hi Gorski, just a thought, and sorry if you already tried this, but I see you mentioned you got a keyboard.  Have you tried unplugging it? I've had some different keyboards cause problems, especially wireless ones because some draw more power than the Pi can handle. Small ones like 'Rii' keyboards work well, but full size ones tend to cause power issues. Also as others have mentioned power supply is key. Many mobile phone supplies provide insufficient power. I always try to use ones with 5-5.25v and 1A or more.

                      • Re: My lovely RaspberryPi is dead...
                        atom_amp

                        Gor Ski,

                         

                          I have an, "extreme" computer sitting next to my desk that I built.  It cost me well over $3000.00 but, like I said, it is extreme!

                        I also have the Raspberry Pi sitting on my desk that I paid $35.00 for.

                          The power supply that I built, just for the $35.00 Raspberry Pi, has a torroidal transformer with dual output leads, 4 voltage regulators that I put together,

                        a built in 4 port USB hub and an internal cooling fan.  The power supply alone probably cost twice what I paid for the Pi.

                         

                           My point here is, if you expect something to work under all conditions, you may have to pay just a few dollars more for it. So, before returning what you think is a piece of junk, unplug all of your peripherals and turn it on.  I too feel you don't have enough power to run what you've put together.

                         

                        If all that you're getting is a red power light, then your Pi isn't trying to load the OS.  Hence, nothing is going to work...

                          • Re: My lovely RaspberryPi is dead...
                            pi_thagurras

                            I have a similar - but different - power-supply issue.

                            Using RaspbMC my RPi model B works just fine.

                            But! using Raspbian - it reboots after about 3 minutes.

                            It didn't used to - I did a complete rpi-update, then an

                            apt-get update, and finally an apt-get upgrade. Since then,

                            it simply reboots. Has the power-handling software had

                            a rejig? Update/Upgrade the only thing that has changed

                            on my RPi'B'.

                             

                            All USB items are routed thru a Belkin 7-port powered USB hub.

                            I have upgraded from a 5V 1200ma PSU to a 5V 2A Nexus 7

                            PSU. The Video Out is via HDMI into a 55" Samsung LED TV.

                            All 5 lights are on - 1 red, 2 amber, 2 green - one of the greens

                            winks as data is being read (?) As I say, RaspbMC works, so it

                            might not be the fuse at fault. All the SD-card 'springs' are OK.

                            Nothing is hanging-off the PCB (dated 2011 and made in China).

                             

                            What to do - get a multimeter? Or replace? (I've owned it 4 months).

                              • Re: My lovely RaspberryPi is dead...
                                smashley

                                Hi John, to me it sounds more like the Raspbian image is messed up somehow, or something went wrong with the SD card (assuming its a different one than your Raspbmc image). I'd first try a different SD card with Raspian installed from scratch, or if you're not concerned with loss of data simply reinstall Raspian/NOOBS on the existing (potentially problematic) SD. I'm not exactly an expert on Linux so I don't know how/what might have caused the rebooting problem. I think you can hold Shift during a bootup to go straight into raspi-config, maybe it's overclocked or something and that's causing the reboot?  With the information at hand I don't think it's a hardware problem, unless it does turn out to be the SD card itself.

                                • Re: My lovely RaspberryPi is dead...
                                  atom_amp

                                  Hi John,

                                   

                                    I just read Matt's reply to you and have to agree with what he's telling you.

                                  when I experienced a similar problem, I found that it was the OS that I put on the SD card.

                                  After 3 or 4 tries of getting the OS onto the same SD card it finally worked ok.

                                  Another thing I found out was that putting the last update on the SD card is what was causing all my problems.

                                  I sure hope that the info between Matt and myself help you with that problem.  Good Luck...

                              • Re: My lovely RaspberryPi is dead...
                                gorski

                                Well, I tried everything, a different PSU, another installation from scratch on the SD card that came with Rpi, another SD card, different image - you name it... It didn't work.

                                 

                                So, I sent it back, as agreed with the seller, and they promised to replace it...

                                 

                                Nothing. Not a word. Repeated emails. Nada!

                                 

                                A loooong time ago now - mid November...

                                 

                                Similar experiences?

                                 

                                What am I to do?

                                  • Re: My lovely RaspberryPi is dead...
                                    gorski

                                    And still no reply.... This is now seriously worrying...

                                    • Re: My lovely RaspberryPi is dead...
                                      iagorubio

                                      Hello Gor Ski,

                                       

                                      I guess from your post you mean you bought your Pi here and there was no support for your problems.

                                       

                                      I don't know the exact detail, but I assure you I have been doing business with Farnell for 20+ years and I never had any problem with them.

                                       

                                      Even once, a long time ago, I had a problem with a etch/wash tank like this 500-005 - MEGA - ETCH/WASH TANK | Farnell España - but an older model - and I had it replaced before I sent them the faulty one. And it's a 500$ part.

                                       

                                      I am sorry  your experience  with them, is not as good as mine.

                                       

                                      I don't know how you sorted your return, but you have to go to your account page and use the return link. There you ask for a return auth number. Once you have got that number, just send them the faulty device and in two days you will have a new one shipped to you.

                                       

                                      When did you bought the Pi ? Their return policy is 21 days from sale date.

                                       

                                      Have you made those steps before your return ?

                                        • Re: My lovely RaspberryPi is dead...
                                          gorski

                                          Perhaps if you read the thread a bit more, you would have see I wrote this:

                                           

                                          "So, I sent it back, as agreed with the seller, and they promised to replace it...

                                           

                                          Nothing. Not a word. Repeated emails. Nada!

                                           

                                          A loooong time ago now - mid November..."

                                           

                                          And still, after who knows how many emails, after all this time - not a word from them...

                                            • Re: My lovely RaspberryPi is dead...
                                              iagorubio

                                              I saw what you wrote, but you did not even wrote if Farnell was where you bought the Pi.

                                               

                                              It' not my bad reading what made me doubt about what was happening, was your explanation of what happened.

                                               

                                              Anyway supposing you bought your Pi in Farnell, got a return number and sent the Pi - because you did not yet told us if that was what happened - you should take this to customer support.

                                               

                                              Farnell is a big and serious company, you have many ways to ask for support.

                                               

                                              If you took an RMA number and sent your device you can get support here Suggest Feedback / Report a problem | Farnell UK

                                               

                                              If you still have no response you can use the phones here Technical Support and Data Services | Farnell UK

                                               

                                              You also have this email to tell them your problem, sales@farnell.co.uk .

                                               

                                              Just don't let it go, if your email contact is not working phone them or use another email.

                                               

                                              What country site did you bought your Pi ?

                                               

                                              May be you can take it to global support in support@farnell.com if you are having problems with a country branch of Farnell.

                                                • Re: My lovely RaspberryPi is dead...
                                                  gorski

                                                  Thank you for all the tips!!! Maybe, eventually, they might answer...

                                                   

                                                  However, next time you should read a little bit more carefully, starting from the very first post:

                                                   

                                                  "A refund is preferable to "repair and return", at this point. No response from "sales" at Fernell, sadly... Just forwarded it to the other email..."

                                                   

                                                  Bought it from the (Fernell, obviously) UK, returned via the courier they sent to pick it up at my address (as I said, all that looked very well, very professional) but then - zip, zilch, nada, nothing, not a sausage...

                                                   

                                                  Echhhhhhhhhhh....

                                                    • Re: My lovely RaspberryPi is dead...
                                                      gorski

                                                      ...oh, I don't know... how sad is this...?!? I have to bump it, so someone finally notices...

                                                       

                                                      Apparently, there are people here who are their employees or partners but...

                                                        • Re: My lovely RaspberryPi is dead...
                                                          Roger Wolff

                                                          Call them! sometimes Emails get lost inside big companies.

                                                            • Re: My lovely RaspberryPi is dead...
                                                              gorski

                                                              Yeah but who knows how many email from the same person...???

                                                               

                                                              But you're right, I will have to do that, too...

                                                                • Re: My lovely RaspberryPi is dead...
                                                                  Roger Wolff

                                                                  Oh, in practise it is not "a technical glitch caused your Email (and maybe a few others to be deleted from our inbox", but more likely that person X who handles the inbox forwards it to Y who forwards it to Z who thinks he's just being CCed on some conversation he doesn't have to take part in. But allow them to keep up pretences that it's the "glitch". Your followup emails follow the exact same path.

                                                                    • Re: My lovely RaspberryPi is dead...
                                                                      gorski

                                                                      Finally, somebody responded... A promise to send a replacement, on a date I requested, as I won't be here in the next few weeks...

                                                                       

                                                                      I will keep you posted... Fingers crossed!

                                                                        • Re: My lovely RaspberryPi is dead...
                                                                          DAFlippers

                                                                          I have a number of RPis and a while ago one that had been working failed to boot.  When power was applied I got the red LED but no green LED.  I goggled/binged for boot issues and you get these symptoms with faulty SD card or SD card socket.  I then tried pushing the SD card as I applied power and sometimes I got a green LED.  So as I had done a lot of work on this RPi (one of the early ones) and it was near enough out of warranty I set about adjusting the contact fingers.  Pop the SD card back in and Bob's your uncle it all worked.

                                                                           

                                                                          So if anyone gets the not booting problem and the SD card can be read in another device try pushing the SD card onto the contacts and if you get a green light it's the SD card socket.

                                                                           

                                                                          David  

                                                                            • Re: My lovely RaspberryPi is dead...
                                                                              gorski

                                                                              Thanx, David!

                                                                               

                                                                              Indeed, I managed to reprogramme the SD card but I have not messed with the contacts...

                                                                               

                                                                              I hope I don't get the chance of finding out if this is a common problem, though...

                                                                               

                                                                              Cheers!

                                                                              • Re: My lovely RaspberryPi is dead...
                                                                                thefold

                                                                                Just signed up to say thank you for the advice given in this post.

                                                                                 

                                                                                My Pi had been working absolutely fine running RaspBMC and suddenly stopped working. I was getting a power light but no card activity. I tried formatting the card and different power supplies with no joy. But after reading your post I tried pushing on the SD card while powering the device on and the activity light starting flashing! I'm so happy it's not dead as I've only had it about a month and it was a birthday present from my wife I'm guessing if it happens again a slight nudge upwards with a small screwdriver is all that is needed?

                                                                                  • Re: My lovely RaspberryPi is dead...
                                                                                    John Beetem

                                                                                    Stuart Luscombe wrote:

                                                                                     

                                                                                    Just signed up to say thank you for the advice given in this post.

                                                                                     

                                                                                    My Pi had been working absolutely fine running RaspBMC and suddenly stopped working. I was getting a power light but no card activity. I tried formatting the card and different power supplies with no joy. But after reading your post I tried pushing on the SD card while powering the device on and the activity light starting flashing! I'm so happy it's not dead as I've only had it about a month and it was a birthday present from my wife I'm guessing if it happens again a slight nudge upwards with a small screwdriver is all that is needed?

                                                                                    A piece of thick paper or thin cardboard might help.  But be careful -- the SD card socket is pretty fragile.

                                                            • Re: My lovely RaspberryPi is dead...
                                                              D_Hersey

                                                              I'm a rpi guy too, but in my summer house I had a wee Android stick, USB powered to run the bedroom entertainment center.  Crummy power out there, big boxes are all on giant filters followed by big UPSs.  Line glitch like usual, blew the little PS and compy clear into the next life.  When I de-couch to set it back up again I will put a fuse and bead in series, a 5.6 or 6.2 biggie Zener in shunt along with a biggy Shottky.

                                                              • Re: My lovely RaspberryPi is dead...
                                                                D_Hersey

                                                                                  X                            X  

                                                                X  X         X   X                        X   x                                                             XXXXXXXXX          X  X

                                                                  X  X       X     X                     X     x                                                             X            X            X  X

                                                                XXXXXXXX        X       XXXXXXXX                XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

                                                                  X  X               X     X                     X     X           X                        X              X            X            X  X

                                                                X  X                  X   X                       X   X            X                        X              XXXXXXXXX          X  X

                                                                                         X                            X               X                        X

                                                                                                                                        X      X          X    X  

                                                                                                                                        X     X         X      X   

                                                                                                                                   XXXXXXX           XXXXXXXXX

                                                                                                                                  X   X X                    X X      X

                                                                                                                                 X   X   X                  X   X   X

                                                                                                                                    X      X                X     X

                                                                                                                                   X        X              X       X

                                                                                                                                 XXXXXXXXX          XXXXXXXX

                                                                                                                                        X                       X

                                                                                                                                        X                       X

                                                                                                                                        X                       X

                                                                                                                                        X                       X

                                                                                                                                        X                       X

                                                                                                                                        X                       X

                                                                                                                                   XXXXXXX            XXXXXXX

                                                                                                                                      XXX                    XXX

                                                                 

                                                                 

                                                                 

                                                                 

                                                                 

                                                                 

                                                                 

                                                                CN1 F1 F2 ZD1 SD1 FB1 CN2

                                                                 

                                                                connector one, one fuse is plastic (self resetting) and the other is metal so it goes kablooee! make it a slightly higher value, Zener diode or maybe super Zener, Shottky diodes lower drop shunts forward Zener drop, FB, make sure not saturated by DC bias!, connector two

                                                                 

                                                                DO NOT SCALE THIS DESIGN UP! -- next regime requires crowbar

                                                                 

                                                                excuse ascii-cad

                                                                 

                                                                values after coffee

                                                                • Re: My lovely RaspberryPi is dead...
                                                                  tech_kid

                                                                  I think ESD might be the culprit.

                                                                  • Re: My lovely RaspberryPi is dead...
                                                                    D_Hersey

                                                                                      X                            X  

                                                                    X  X         X   X                        X   X                                                             XXXXXXXXX          X  X

                                                                      X  X       X     X                     X      X                                                            X            X            X  X

                                                                    XXXXXXXX        X       XXXXXXXX       X        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

                                                                      X  X               X     X                     X     X           X                        X              X            X            X  X

                                                                    X  X                  X   X                       X   X            X                        X              XXXXXXXXX          X  X

                                                                                             X                            X               X                        X

                                                                                                                                            X      X          X    X  

                                                                                                                                            X     X         X      X   

                                                                                                                                       XXXXXXX           XXXXXXXXX

                                                                                                                                      X   X X                    X X      X

                                                                                                                                     X   X   X                  X   X   X

                                                                                                                                        X      X                X     X

                                                                                                                                       X        X              X       X

                                                                                                                                     XXXXXXXXX          XXXXXXXX

                                                                                                                                            X                       X

                                                                                                                                            X                       X

                                                                                                                                            X                       X

                                                                                                                                            X                       X

                                                                                                                                            X                       X

                                                                                                                                            X                       X

                                                                                                                                       XXXXXXX            XXXXXXX

                                                                                                                                          XXX                    XXX

                                                                     

                                                                    SuperZ.jpg

                                                                    This is a super-Zener.  The industry hasn't been marketing power Zeners since my son was born.  I'm a grandpa.  Obviously this only apes the Zener in reverse breakdown mode, so this must be paralleled by the power Shottky.  BV(breakdown potential) is Vz+c. 0.6V, 1.2 for Darlington.

                                                                    Not all rpi setups are the same.  3.5W seems to be a max for the board alone, we could use 10W for our design-point, implying a flow of 2 Amperes.

                                                                    In an extreme stress event, this device only has to be robust (must be?) enough to live 'til the fuse rides to the rescue.  Moderate situations could have it warming up some without blowing (activating?) the fuse.

                                                                    • Re: My lovely RaspberryPi is dead...
                                                                      D_Hersey

                                                                      For the connectors, if one has reason not to mess about w/ usb pcb connectors, he could use screw-terminals and simply snip a pass-through cord about the middle, so long as he reckoning upon and implemented stout strain-reliefs.

                                                                      Since one isn't using all of the wires,one has to be careful in treating the unused ones.  If you have to construct your own lumpy bit to cover over a connection or something, one can make a little mold and fill it with silicone RTV intended for electrical application.

                                                                      Meltable and fusable inner-core heat-shrink is often available at the boat supply store, in a pinch.

                                                                      Looking at the details of it, in this low-low-power situation, the plastic fuse might not be appropriate.  It would require that we always use minimally half the power of our max drain.  So let's skip it.

                                                                      One fuse that might work is a Littelfuse 0251002.MRT1L

                                                                      leave on some of its leads and use a heatsink close to the body of the device.  This is an ultimately thermally-activated device.

                                                                      let's use a TIP31C for our power Q.  An itsy-bitsy TO-220 heatsink nudges it closer to its DS rep.

                                                                      It would be a pretty tight clip with a 4.7 V Zener at the helm.

                                                                      1N5821 is a leaded Shottky diode rated at 3A continuous with a 30V reverse breakdown potential.  Seems to be the commodity part.

                                                                      • Re: My lovely RaspberryPi is dead...
                                                                        D_Hersey

                                                                        This circuit should offer pretty-good ESD protection.

                                                                         

                                                                        I haven't described our bead.  We want slow-mix, and we only want to half-saturate at 3A dc.  Lunch time, I'll be back with a p/n.

                                                                        • Re: My lovely RaspberryPi is dead...
                                                                          D_Hersey

                                                                          fair-rite 2773009111 would be workin' hard, but it would probably work.

                                                                           

                                                                          Nothin' says we can't bulk up with a little bulk capacitance across the supply.  Maybe some e-lytic water-towers, some MLCC for speed.  I don't recommend tantalum for reasons of conscience.

                                                                          • Re: My lovely RaspberryPi is dead...
                                                                            D_Hersey

                                                                            I'd go, maybe, 2200 uF w/ da e-lytic.  Your best protection against ESD indoors is humidity.  I have an off-the-shelf feedback controller running a dumb humidifier through an SSR.  Attached to the front-end of the controller is a linear humidity sensor I got for $20.  Whole deal just < $200.  Took me half-an-hour to setup.

                                                                            • Re: My lovely RaspberryPi is dead...
                                                                              crystalnetworks

                                                                              After reading this post for no other reason other than a notificaiton on my droid I thought I would go mess with my RPi since I was having some trouble with RASPXBMC which turned out was because I needed a power supply with higher current. I resolved that with a 12$ mini hub I bought on a impulse.  Here is where it gets kinda odd.

                                                                               

                                                                              My 12$ hub is plugged into wall power

                                                                              The pi power is plugged into the Hub.  Great now it powers up.

                                                                               

                                                                              For giggles I plugged the hubs USB imput cable into the PI thinking this can't work.  I am creating a ground loop.  It works perfectly.

                                                                              So then I thought I wonder if I can plug in the wifi donge, keyboard and mouse to the hub.  It works PERFECTLY!

                                                                              Then I thought.  I wonder if it will also power my ARDUINO!.  It works perfectly and I can program it through INO over SSH through the Pi.

                                                                              Then I thought.  I wonder if I can put the PiFace daughter board on.  It works!

                                                                              Then I thought.  I wonder if I can put the LCD screen on the Arduino.  It STILL WORKS!!

                                                                               

                                                                              I stood back and looked at it and discovered that I accidently created a whole system of mashed together platforms that I could build just about anything with all because I was reading this thread about power issues.  Its been running for 2 days now with out a glitch.  Next step will be to build a battery pack that can power the whole lot of it.

                                                                               

                                                                              I know I didn't help any but I thought it was funny.

                                                                              • Re: My lovely RaspberryPi is dead...
                                                                                D_Hersey

                                                                                Well, let's give that one a think. . .

                                                                                 

                                                                                Now, it may defeat the original purpose, (which is a dubious one in my mind, I don't lose sleep over these little losses in prototype systems) somewhat, but an inrush surge limiter in series w/ da power could clear that up, maybe, at the cost of always having to draw 200mA.  Be a little brutish, but we could throw a backward Shottky diode across our load and hope our relay contacts don't weld before the relay actuates, a fairly safe bet, IMHO, if we are talking wall-wart.  Seems more bulk capacitance across the supply would help by allowing more time in the reverse-case. . .

                                                                                 

                                                                                Frankly, if it is a little CMOS controller, I often just use a linear regulator to drop to my logic potential.  I just tell my self that the intervening diode(s) are helping my drop-out situation.

                                                                                • Re: My lovely RaspberryPi is dead...
                                                                                  D_Hersey

                                                                                  One could use a bistable relay. . .

                                                                                   

                                                                                  This seems to get sorta rococo.  This event of getting skunked by the reverse-polarity wall-wart-from-perdition is a rare, although terrible, event.  I'm thinkin' if Qdiss is that bigga deal, how about a series picofuse and a shunt backwards Shottky diode?  We can tape a spare up under the box.

                                                                                    • Re: My lovely RaspberryPi is dead...
                                                                                      altairlabs

                                                                                      Even simpler  ==  Just swap the NO and NC contacts, and turn around all the diodes and LEDs…. DOH

                                                                                       

                                                                                      So when power is applied the relay coil energizes only if polarity is correct, then power is passed to load after a delay of a few milliseconds.

                                                                                       

                                                                                      No idea what the author was smoking, it’s an old trick and he still managed to get it backwards.  The way he does it, that few milliseconds of reverse polarity is an awful long time in the world of electrons.

                                                                                    • Re: My lovely RaspberryPi is dead...
                                                                                      D_Hersey

                                                                                      Except for a little time delay, that's similar to a circuit that uses a relay to shunt a resistor after the filter caps are filled on an audio amp.  The only problem with this scheme is that the original  motivation was to avoid the power dissipation implied by the forward drops in our protection diodes.  Now we've got that darn relay coil on all of the time, presuming we are using a conventional relay.

                                                                                      • Re: My lovely RaspberryPi is dead...
                                                                                        lirva1

                                                                                        I had the same symptoms as the original post and it was due to the wrong format on my SD. When I changed from exFat to FAT32 everything was wonderful again.

                                                                                        • Re: My lovely RaspberryPi is dead...
                                                                                          ninjas005

                                                                                          i have got a problem yesturday. i was working on a project with my raspberry pi 2.

                                                                                           

                                                                                          suddenly i lost connectiontion to my pi. i restartted it several times now its not comming back on.

                                                                                           

                                                                                          symptoms: Red pwr led and green led are lit always. green led is not blinking as if said before. i tried by connecting through the hdmi port. it shows a blank black screen only.  i also tried by removing sd card (without card), same symtoms persists. i think i have a problem with the sd card slot. as the card is working with my pc. i formatted the card and tried with a fresh sd card. the same problem persists.

                                                                                           

                                                                                          can anyone help me in rectifying this prkblem. is there any kinda fix for this problem.

                                                                                           

                                                                                          regards.

                                                                                          • Re: My lovely RaspberryPi is dead...
                                                                                            sollys19xx

                                                                                            Hello everyone

                                                                                            I am in need of help, the problem is that I need to buy a computer that is high enough to be able to work and play games. May all help, advice.

                                                                                            Thank you

                                                                                            1 of 1 people found this helpful