MacBook A1278 main 820-2327 green led but does not turn on

[reset1986]

Hello everybody,
I have this macbook with motherboard 820-2327, with power supply inserted the led turns green but does not turn on, no rotation of the board

There is no liquid damage or short circuits,

measured
PP3V42_G3H. 3.42v

PP1V05_S5_REG. 1.05 v

the initial lines S5 are present
smc on / off. 3.3v

I find 0v on the PM_SLP_S4_L line.
this is generated by the bga mcp79, I suspect it is broken and does not activate Line S3 S0

you have suggested about other measurements to do, thanks

I attach wiring diagram

[SMDFlea]

Re: MacBook A1278 main 820-2327 green led but does not turn on

https://logi.wiki/index.php/PM_SLP_S4_L_Timing

[reset1986]

Re: MacBook A1278 main 820-2327 green led but does not turn on

https://logi.wiki/index.php/PM_SLP_S4_L_Timing

thanks for the information, I will measure the lines and update

[piernov]

Re: MacBook A1278 main 820-2327 green led but does not turn on

Power button must be triggered for this machine to turn on.

[reset1986]

Re: MacBook A1278 main 820-2327 green led but does not turn on

Power button must be triggered for this machine to turn on.

Jumper the alternative ignition pins but nothing happens, no ignition