820-3115 no backlight

[raainxx]

PPVOUT_SW_LCDBKLT=25V
BKL_EN=3,112V
i change before Q9706 because PPBUS_SW_LCDBKLT_PWR=0 now it's 12V

 

[rvanpruissen]

Check voltages on BKL_PWM and SMC_LID.

 

[raainxx]

BKL_PWM=1,327V and SMC_LID=3,471V

 

[dukefawks]

Do a PRAM reset, PWM is too low.

 

[raainxx]

i can't, it's strange today i can't start the board, i push on button the led white in front light but no sound of superdrive, no boot i don't understand, fan spin always.
what is need for a board make a boot?

 

[dukefawks]

what is need for a board make a boot?

A whole lot!

CPU Vcore still present?

 

[raainxx]

ok i understand.
i find Q9706 pin 3,4 in short with the other pin, not to GND. i remove Q9706 but same problem.
PPVCORE_S0_CPU = 1,159V

 

[dukefawks]

Q9706 has nothing to do with the board booting. It can be anything that you damaged while working on the backlight, I have no way to tell.