V3x problem

[Nasmi]

Dear Sir,

I had a V3X dead phone and i flashed it with original files but i am not able to switch on the phone, after that i started charge the and i presed the pwoer button, the the phone switched on, my problem is i am not able to switch on the phone with out charger,

please help me to find the problem on witch part it is on the bord.

THANKS
NASMI