I have a 5 inch prime view LCD display which is using in an equipment. When i switch on the power knob, the lcd lights up and then goes blank? i opened it up and there are two PCB cards inside it. When i disconnect one of the the LCD lights up OK. as soon as i connect the other card (Ribbon cable) it switches off after 1-2sec. Can someone help me out by telling me what could be a likely fault in that?