820-2936 not backlight

andrespi

Member
hello this macbook after a maintenance that i did now it does not work backlight.the macbook have image but no backlight,I also tried with a screen in good condition but the problem persists
these are some measure
f9700 its good
D9701 PIN1=12.58
D9702 PIN2=12.56
Q9706 PIN1=12.59
PIN 2=12.59
PIN3=4V
PIN 4=12.59
PIN 5=12.59
PIN 6=12.59
 

andrespi

Member
BKL_EN=3.1 v
BKL_PWM=1.9v multimeter, BKL_PWM levels need oscilloscope?
PRAM reset 2-3 times persists problem
 

2informaticos

Administrator
Staff member
Change U9701.
Be sure to get good solders.
Once the chip is removed, check traces between D9701 and U9701 pads.
 
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