Replace Modified xbox 360 Motherboard

Hello everybody,
i wanna know something if you guys could help me. i have a modified or modchiped xbox 360. i pulled out the HD AV cable to unplug it from my xbox 360 last week it was kinda stucked when i pulled it so it break few pins inside that part. so i replaced that part.. now it only works on TV Mode. when i plug it into HDTV mode i can only hear the sound but no picture. before it was good.. so i need some serious help & i already paid 70$ to replace that part... so now what should i do..


Pleae help me.
Haroon