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820-3747 BKLT_PWM Low.

R

Ryanlen2

Member
Macbook air no backlight with no real history. Board has been cleaned with liquid indicators tripped.

There is an image on screen, just no backlight

BKLT_PWM (With Screen) - 1.47V

BKLT_PWM (Without Screen)- 2.6V (without screen)

BKLT_EN - 2.7V

Changed driver with no change. Also replaced r7704 and c7704 with no change.

Diode mode on BKLT_PWM - .526

Should I assume bad CPU/PCH on this...?

Thanks!
 
J

JohnB8812

New member
Nah I don't think so. What voltage are you getting on backlight currently? Also diode mode on backlight output?
 
R

Ryanlen2

Member
There happened to be a slight crack on pin 1 side of L7701. No sure how that would cause BKLT_PWM to be low, but it works.

Thanks, have a good one.
 
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