820-01827-01 - chime / no image / no external image

[quasimodo]

Hey guys,


having a 820-01827-01 board here. no liquid / corrosion.

Had 5V on the charger, changed a faulty CD3215, now i got 20V, 1A draw. Machine is booting. Gives me a chime, Touch-Bar is turning on. But no internal or external image.

Possible U9850 damage? Even with no external image? Or GPU-game over?

 

[2informaticos]

Check diode mode to ground on data lines of video connector.
Test external monitor disconnecting internal LCD.