MacBook Pro A2442, board 820-0298-A, no backlight

[survivalbloke]

I'm working on a MacBook Pro A2442, board 820-0298-A. This device was liquid damaged and had no power. After I repaired the liquid damage, I find the device powers on and works with external video, but backlight is not working.

Anyway, I really want to improve my fault tracing skills, instead of having to rely on others to always tell me where to look and what to check. In this case, I have a question about navigating schematics. If I wanted to trace the backlight power circuit, how do I find where that circuit begins? If I search for "lcd" in the schamtic, it is listed on many pages.

[mon2]

I think you mean 820-02098?

Check the voltage of PPVOUT_LUXE to ground.

[obelix24]

i will pin myself as i have same macbook with same issue. I've 0V on PPVOUT_LUXE

[obelix24]

survivalbloke have you fixed this ? i'm having same issue,.

[obelix24]

Ok so i found the problem 🤣 i was missing one resistor in backlight near UP800 (it was i think RP832). After adding this resistor backlight start working again.

[mymacdz]

I SUGGEST THAT YOU CHECK THE CAPACITOR

[PITERPENY]

on new devices all have a problem with the display tilt sensor. check first