820-3476 pulsing backlight, SMC_LID?

[ajdoc]

Liquid damage around J5250

Was turning on but no image.
Replaced damaged J5250, R5250, C5250.
Now got image and backlight but after a few secs backlight is pulsing and once lid is closed and open there is no image so it think the lid is closed.

Any idea?

 

[2informaticos]

Check SMC_LID level in that moment.
You can remove R5250 and check if image is stable.

Probably corroded solders/traces at J5250.
You can run wires from Hall sensor IC directly to the board; 3V42, ground and lid signal...

 

[ajdoc]

R5250 removed and backlight was solid, no pulses.

Corroded trace - 3V42 to J5250.

Fixed now - many thank for help.