No response on replaced touchscreen??

[3600]

Hi!

I accidently cracked the protective glass on my touchscreen, when i dropped the phone on the floor. The display still works but there is no response when i tap on the screen with my stylus.

I ordered a new touchscreen from www.mytrendyphone.se and replaced it. Still no response when i tap the screen with my styluspen =(

What could have happened with my phone? Is the motherboard damaged maybe? Maybe some circuit that has been cracked?

Must i replace the motherboard or is there some fix for this problem?

I have looked really close on the motherboard and i can´t see any damage of any kind.

What should i do?

Edit: I disassembled my P3300 and tested the replacement screen on its screenconnector. Now the replacementscreen respond to the styluspen. But the old cracked screen did´nt respond while connected to the P3300. I also tested the P3300-screen on my P3600, and it did´nt respond.

Cracked screen on P3600 = No response
Cracked screen on P3300 = No response

Replacementscreen on P3600 = No response
Replacementscreen on P3300 = Responding

P3300-screen connected to P3600 = No response
P3300-screen connected to P3300 (itself) = Responding