820-00165 no backlight

MegaObi

Member
hey all

i have 3.3 coming to u7701 also 5v is there feedback line is good
f7700 has 8.67v but nothing on lcd boost?

please help.
 

2informaticos

Administrator
Staff member
Do you have image for sure?
If yes, post BKLT_EN and BKLT_PWM voltage.
If not, check for USB activity.
Does it chime at least?
Post voltage on both pins of D7701.
 

MegaObi

Member
100% got image boot all the way to os. Chimes!
D7701 no power on both ends i checked both traces from u7701 i also change u7701 just in case.
no voltage on d7701 and bklt_en & bklt_pwm

i forgot to mention this was also some waterdamage
3 area affected with visible corrosion:
u5110
u7090
q7560

can this be part of problem?
 

MegaObi

Member
i forgot to try with lcd after u7701 replacement. i ultrasonic and test in machine its all good. everything working perfect.

thanks so much informaticos
 
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