[SOLVED]820-3330-B Trolling me - Bad Keyboard? No backlight

Joesipaq

New member
Hello all, Today I Have a 820-3330 that is giving image, but no backlight
Client said they spilled tea on their computer (assuming kb) No liquid damage on board.

LVDS connector is good, fuse is good, not sure about cable as I don't have a spare one to try. But SW_0 is 21v, so that wouldn't be enough to give me back light anyways...

Q9706
pin 4 - 12.56
pin 3 - 12.19
pin 1,2,5,6 0.04 and drops (without screen connected)

Q9707
pin 5 - 3.3v w/screen conn
pin 4 - 0v

R0901 = 4.63k

U9600
PP1V2_S0 - 1.2V
PP1V8_S0 - 1.8v
PP3V3_S0_GMUX_R - 3.3V

U9701
BKL_EN - 3.12V
SW_0 - 21v


Capslock button turns green for a moment, then back off

Anyone know what pins on J5713 I can short to act like the brightness up button before replacing kb? Unfortunately I do not have one in stock at the moment.

Thanks!
 

dukefawks

Administrator
21V means the PWM signal is probably not present. Do a PRAM reset with an external USB keyboard first. Disconnect internal keyboard and replace it when you get a new one.
 

Joesipaq

New member
21V means the PWM signal is probably not present. Do a PRAM reset with an external USB keyboard first. Disconnect internal keyboard and replace it when you get a new one.

Thanks Duke! I didn't think about an external USB kb to try out. Worked like a charm, I have light now :) can the USB kb also be used for an SMC reset? I tried, but it didn't work for me.
 
Top