820-3435-A no image on internal display

WeLoveApple

New member
No history. It does not seem to have liquid damage and corrosion.
There is image if I connect an external display. Though it freezes at half of boot. Also I could not seem to able to boot from external HDD.
So it seems a bit more complex.
I am not able to test with another LCD.
Where should I look?
 
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