1 of 1 people found this helpful
There is a page here, see the comments at the bottom, there are perhaps several hundred comments there with symptoms and solutions:
Also, there are some photos here showing how you can examine the connectors to ensure they are correctly contacting with the flat flex:
If this doesn't help, it could just be faulty and need replacing. But you should check those two links, because if it originally worked but now generates garbage, you've likely unseated a flat flex cable slightly.