820-3437 open lid, display turns on for a second then off??

Puevig reven

New member
I have a 820-3437 when I open lid, display turns on for a second then off. If I push power button the display turns on for a second then off??
 

Puevig reven

New member
I was wrong, there is a image, it is no backlight, comes on when computer starts with apple, goes off when user screen comes up.
 
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