3 Replies Latest reply on May 19, 2011 6:48 AM by JohnDSiviter

    DLP Projector Teardown

    JohnDSiviter

      DLP Projector - TearDown

       

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      The one I obtained (£20 off ebay) had a drop to the lower left hand corner, plus the main switching regulator had gone into meltdown (Prob as a result of the drop then powered up):

       

       

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      Right image shows the blown switcher (Bottom To-220 device), the bottom left image shows the small aperture in the lamp compartment, those of you thinking of using a power LED as a replacement for the lamp will need to focus and collimate the light into this aperture, the light then passes through the colour wheel (Which has seperate RGB filters and eventually bounced off the DLP actuator and back out through the lens onto the wall. Wouldnt it be nice if we could replace the colour wheel with an high intensity RGB LED?, unfortunately very high power RGB LEDS are pretty expensive and approaches the sort of pice you would pay for a 2nd hand working projector.

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      The image left shows 1 of the 3 temperature sensors contained within the unit to detect lamp temperature, as well as detecting lamp overheating (Mercury vapour lamps require protection), they also detect that the lamp has reached sufficient temperature. The picture on the right shows the back end of the lens assembly, complete with flexible PCB and massive heatsink.

       

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      Picture on the left shows the proprietry Texas Instruments DLP DSP ASIC BGA, whilst the right one shows the flexible PCB that attaches to the back of the DLP Actuator.

       

       

       

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      The picture on the left shows the PGA DLP Holder with Fexlible PCB removed, right hand image shows the DLP actuator with FPC.

       

      After further investigation I found out the back side of the DLP board shown above had over heated destroying several components, so made it unfeasible to repair.

       

      Anyone wishing to modify a DLP for LEDs, there are lots on ebay going really cheap, just make sure the lamp is the only faulty part.

       

      Operation: