iPhone 7 water damage repair fully functional with non Apple but not OEM screen - GSM-Forum

Tech_Jedi · 06-04-2020, 06:23

I did an ultrasonic cleaning on the iPhone 7 motherboard and touched up any bad solder joints and replaced several components on the board and the phone appeared to be fully functioning. The screen I was using to test the phone was an aftermarket screen.

I reassembled the phone with the original Apple screen and the apple logo came up a very light gray instead of black (iphone 7 silver so white screen with black Apple logo on boot). When the phone booted up to the lock screen there is no color, everything is very light gray, and there is no touch functionality. I tried multiple aftermarket screens and multiple OEM screens and it was the same each time. Can anyone explain this?

I have done diode mode readings on the touch and display connector and the only faulty values I am seeing are on pins 32, 36 and 38. The diode mode readings are low at those pins. I checked the resistance on each of the coils on each of those lines L3901, L3903 and they are a little low compared to the known good values but nothing crazy. The next connection on those lines is under the CPU.

I'm stuck about what I should try next.

Any help would be appreciated.

Tech_Jedi · 06-06-2020, 03:06

Does anyone have any ideas?

06-04-2020, 06:23	#1 (permalink)
Tech_Jedi Junior Member Join Date: Sep 2018 Location: Lincoln, Nebraska Posts: 11 Member: 2863634 Status: Offline Thanks Meter: 0	iPhone 7 water damage repair fully functional with non Apple but not OEM screen I did an ultrasonic cleaning on the iPhone 7 motherboard and touched up any bad solder joints and replaced several components on the board and the phone appeared to be fully functioning. The screen I was using to test the phone was an aftermarket screen. I reassembled the phone with the original Apple screen and the apple logo came up a very light gray instead of black (iphone 7 silver so white screen with black Apple logo on boot). When the phone booted up to the lock screen there is no color, everything is very light gray, and there is no touch functionality. I tried multiple aftermarket screens and multiple OEM screens and it was the same each time. Can anyone explain this? I have done diode mode readings on the touch and display connector and the only faulty values I am seeing are on pins 32, 36 and 38. The diode mode readings are low at those pins. I checked the resistance on each of the coils on each of those lines L3901, L3903 and they are a little low compared to the known good values but nothing crazy. The next connection on those lines is under the CPU. I'm stuck about what I should try next. Any help would be appreciated.

06-06-2020, 03:06	#2 (permalink)
Tech_Jedi Junior Member Join Date: Sep 2018 Location: Lincoln, Nebraska Posts: 11 Member: 2863634 Status: Offline Thanks Meter: 0	Does anyone have any ideas?