Nokia 5610 Xpress Music & 6500 slide

[kubaant]

Hello, I have two identical phones Nokia 5610 XpressMusic and the 6500 slide, - viscera are almost identical.

Namely:
In 5610 the display is not working, the LED is on - but no picture, everything else works, you can operate the phone in the dark, call etc.

6500 sldie keys do not work 4, (2 function and pad up and left)

After disassembled and substitution of "the top" problem is still the same. So top insert from 6500 to 5610 is revealed, so that the keys which should not normally work, because even if the flex is bad logically should not work - but how can you guess the flex is not broken. But motherboard, and now exactly what would break? For what is heard?

The same as the 6500, 5610 Xpress behaves the same on body 6500, wonder about the display works!, but unfortunately the keys do not work mentioned earlier - here to make the fault of the motherboard - only what? emi-filter’s?

Also, motherboard from 5610 was ultrasonic drip but 0 results.

For all the valuable answers, hints huge! thanks.

Sorry, my english is poor.