djdblaster
New member
Water damaged around USB on board. Cleaned. Feeback trace is good. I get 20V out, nothing on screen. I've tried another display, same thing. What am I missing?
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820-00165-A no backlight
- Thread starter djdblaster
- Start date
Did you try PRAM reset?.
Check BKL_PWM signal when press backlight control keys.
You may need to change LP8550...
Check BKL_PWM signal when press backlight control keys.
You may need to change LP8550...
djdblaster
New member
I tried PRAM and nothing.
What are backlight control keys? PRAM combo?
I?ll report back with BKL_PWM voltage tomorrow.
What are backlight control keys? PRAM combo?
I?ll report back with BKL_PWM voltage tomorrow.
djdblaster
New member
BKL_PWM is 1.5V.
Tried new backlight IC, nothing.
Tried new backlight IC, nothing.
PWM stable 1.5V pressing backlight control keys?
Srill stuck on 20V, after changing the chip?
All return resistors OK?
Post diode mode (red probe at ground) on return lines, measured on LCD connector side; w/ and w/o LCD connected.
Srill stuck on 20V, after changing the chip?
All return resistors OK?
Post diode mode (red probe at ground) on return lines, measured on LCD connector side; w/ and w/o LCD connected.
