820-00165 No backlight

rlowe215

Member
Working on a 820-00165 with no backlight

Have video but backlight missing

PPHV_S0SW_LCDBKLT 24 v

BKL_PWM 0.44v
BKLT_EN 2.88v
 

2informaticos

Administrator
Staff member
"BKL_PWM 0.44v"
Too low.
There is PWM signal, but DC value on a DMM should be higher however.

Do few PRAM reset first.
If no result, remove R7704 and run a wire from R7715 to C7704.
Confirm maxim backlight in this case (I hope).
Do again PRAM reset and finally resolder board in original state.
Let us know if then works.

BTW, backlight circuit of 00165 has lot of threads on the forum; just use the search function...
 
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