820-00165 backlight

[andrespi]

good, this macbook was changed 2 times backlight chip lp8550 and after a week it comes back and fails with the same original failure, this is the original video failure. macbook works well and the light goes out, it was already tried with another screen and the problem persists. https://www.youtube.com/shorts/20yXILa1XbI

 

[2informaticos]

Did you check XW7720 bridge?
Be sure BKL_EN/PWM signals are stable.

 

[andrespi]

XW7720 there is continuity, BKL_EN/PWM are stable 3.2v

 

[2informaticos]

Possibly bad solders.
Heat the chip and gently tap it on top.
Put some good flux...

 

[andrespi]

change backlight driver lp8550, and backlight is not working. BKL_EN=0v

 

[2informaticos]

Check the resistors which generates BKL_EN signal.
Do you still have image?