just wondering if any of you own or have delt with the "CLARION VRX578RUSB DVD MULTI-MEDIA"

i got one with the car when i bought it altho he said it was broken.

i tryed it anyway with no luck
anyway, iv checked all the fuses, took it to pieces found nothing wrong with it, put it together, plugged it in and got power! it worked.. for about 5 minutes untill i took the front face off when messing about with the buttons

i know its been to a few shops to be fixed and they said it cant be fixed or isnt worth fixing for the price!

any ideas whats wrong
any common faults with them?