820-3302-A No Backlight

Shredplayer

New member
Pardon me if i post it here since i can't find an imac section, iMac 820-3302-A works but no backlight

F9700 = 12v pin 1 & 2
R9712 = 12v pin 1 & 2
FB9708 = 12v pin 1 & 2

P MOSFET Q9702

Pins 1,2,3 = 12v
Pin 4 = 11.75
Pin 5 = 0v

Replaced Q9702 still no backlight pin 5 = 0v

R9721 pin 1 = 12v while pin 2 = 11.75 BKLT_EN_DIV and connected to MOSFET Gate, since this is a P MOSFET is this pin supposed to have lower voltage so MOSFET will let power through Drain?

Changed R9721 still 0v on MOSFET pin 5.

Currently i am staying away from replacing U9700 since VIN pin 23 power source is from PP12V_S0_BKLT_PWR which i believe generated by Q9702 Drain

Any help will be appreciated.
 

2informaticos

Administrator
Staff member
If you (at least) supposed that low voltage is required on Gate pin, WHY did you change Q9702???
I didn't see any refference about BKLT_EN presence (or not).
Post U9100 voltages.
 
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