7200 display problem

[gibso]

hello friend i got this 7200, no display on the LCD,
the lcd unit is confirmed 100% good with another set,
connector confirmed 100% good with another set, infact the connector works 100% on another set, so i've roled out the connector and LCD circuit as the porblem, then the problem is from the PCB,
i've cleaned with ultrasonic cleaner no result,
someone pls tell me what next to do,

thanks in advance,

gibso.

[gibso]

less i forget, i also full flashed phone, no result,

thanks ,

gibso.