Touchscreen/Digitizer Issue mk16i xperia pr

[biopower]

Hello at all.

a year ago the phone fell on ground. since that time it has broken digitizer. the broken digitizer still works nicely. i gave it to a professional repair company. they ordered a new digitizer and replaced it. but it didnt work. they thought the sparepart is also defective. they ordered a second one. but also didn't work.
then i sent phone to datrepair. also big company. they said it cannot be repaired because of no stock rom. descided to make some research by myself. now i ordered a digitizer by myself and replaced it. was quite easy by the way. but it only works partly. there are working areas and non working areas. where is the problem? installed mouse and tested it with the service tests> touchscreen. before replacing the digitizer and for testing i flashed stockrom 2.3 an 4.04

Thanks in advance.
Regards Rafael.

 this is the new touchscreen.

again. the broken touchscreen works nicely.

are there soo many defective touchscreens on marketf

[Uliwooly]

The problem could be the motherboard, you need to contact your local Xperia care so they can check it

http://support.sonymobile.com/global-en/contactUs/

[biopower]

then the phone is trash. a mainboard cost three times more then a new pro. why the old digitizer works and the new one doesn't.

[Uliwooly]

it could be that perhaps the ribbon on the new digitizer its loose, or maybe its faulty. 

[biopower]

guess the ribbon is ok cos the contoller for the digitizer is on a small pcb at the digitizer itself.

[Uliwooly]

If possible test a new digitizer 

[biopower]

i will ask the seller if he can send different digitizer. but guess there is no warranty for spare parts.

[Uliwooly]

Keep us updated 

[biopower]

where does the assumption come from that it has to do with the mainboard?

How does the Digitizer communicate with the mainboard?

Regards Rafael

[Uliwooly · Accepted solution]

I don't quite understand your question but if the motherboard its faulty then other parts might not work.