ZTE StarTrail 4 not responsive touchscreen after board replacement

[Guest Mr.n0b0dy]

The phone had problems with the NAND chip, so i replaced the board with one from ZTE blade Q, but now when i turn on the phone, the screen is not responsive at all.

I think that maybe the chip on the flex cable which is responsible for the touch can't talk to the board, so my first thought was to solder the touch ic from the original board, but then i saw that this is a common problem with this model. Everything else works.

And if someone can post a link to a board schematic of a ZTE phone i will be very thankful, because i surf the internet and found NON..

Edited August 25, 2018 by Mr.n0b0dy

[Guest Mr.n0b0dy]

Update: The issue was in problematic proximity sensor, so i removed it and now the touch is working properly!