A friend gave me a black iphone 5 to fix and it was working before the repair but the screen was badly damaged. The LCD...

If you happen to accidentally break off one of the teeny tiny little metal pieces on the logic board next to the LCD...

how did you know that this was the problem with the touch screen? the "black resistor" I am having the same trouble with my touch screen. I have restored, rebooted, bought 3 different model screens, tried gorilla tape to hold down a tight connection, used 90% alcohol to clean the insides everything. Everything is working find on the ipod except I can't get the touch screen to work and it's driving me nuts!

I am having the exact same problem! I have an ipod touch 2nd gen that I recently bought off ebay and the only problem the guy said it had was the screen would not open. I opened the ipod touch, cleaned it and looked around at the parts and everything looks ok, though I noticed from the headphone jack that the ipod has gotten wet. Everything else from what I know so far works great. The ipod powers up, is recognized by itunes, the battery charges, lcd screen works, I have restored it several times, updated the firmware, and it syncs. I have tried two different screens: #821-0627-03 and 04 but neither is working. I am about to pull my hair out trying to figure out why this screen would not be working! I keep looking at the connector thinking it may have some corrosion inbetween the pins but I can't tell (even with a magnifier) if that's just the color that's off or actual corrosion. I have cleaned the connector also with 90%+ Alcohol, too. Help Help Help PLEASE!