Unhappy HTC Endevour/One X - Wont charge+screen flickering (but works ? )

Hi everyone , yesterday i change my HOX motherboard but now when i connect it to the charger , it says in battery menu "Charging (USB)" , i wait it 4 hours but it wont charge , and + screen is a bit dark,its flickering...one guy told me it is from some little sh*t in motherboard...so can u tell me how to fix it?I will try , i am ready just tell me what i got to do ?
Thanks all