blank mode v3
 

please help me,I can not repair v3, it is in blank mode,even with testpoint ubl stops reading handset version info,flashing ok,but repair can not do.finally tell me how phone enter in normal mode,it does not turns on

I have a sililar problem but this has caused the lcd to stop displaying. Keypad is lit but nothing on screen. Lcd and flex cable is ok what to do.