XS Max Touch screen problem with original display, works well with China display
 

Hi,

I have an Iphone XSM that has never been repaired before. The problem was caused by a shorted capacitor at the PP_VDD_Main line.

After repair, the phone powers up but Original TS not working. We put the original TS on another phone and it's fine.

The phone works well with a China display.

All the reading on J5800 is good using diode mode.

I have also replaced U5600 but still the same problem.

There is no voltages on the following lines
PP3V5_RACER
PP5V25_TOUCH_VDDH
PP10V0_RACER
PP1V8_TOUCH_RACER_S2

All related caps around U5600 is ok and not shorting.

Can anyone help please? Thanks

U2900 is the problem, reballing or replacing

Hi. Did you solve the problem? I have the same phone, after reworking the top board, the sensor stopped working on the original displays, it works fine on the Chinese displays. Everything is fine on the sensor connector except for some power supplies.