Car DVD play when the white screen, but there is music, what is the reason ah,

Car DVD play when the white screen, but there is music, what is the reason ah,

I was trying to

Is there a problem connecting the video line?

All white screen TFT (panel circuit) board connection screen cable contact bad, 2 positive and negative voltage circuit abnormal all the way is 12 ~ 15V all the way negative 5 ~ 7V one of the abnormal will be white

White screen is normal cable contact is not good, will be white screen instructions such as backlighting normal, check the cable and there is no voltage to the screen.