820-3126 led 1 turns off when press power button

[BCN_Techs]

No water damage, no history. Just stopped working.


Randomly it is booting ( may boot 10 times without any problem), but some times when i press power button led 1 turns off. Already tried new power supply ( known good) but same result. Than i have to disconect cable, wait few seconds, connect and try again. No visible issue on logic board.


Any idea?


Also changed U7700 but same

 

[2informaticos]

Try changing Q8110.
3V42_G3H and SMC_PM_G2_EN are steady high?

 

[BCN_Techs]

It was q8110. Thank you

 

[lincev]

hi i have the same problem, i replace Q8110 but nothing... (I think it is well soldered)

SMC_PM_G2_EN = 3,3v
3V42_G3H= 2,75v

any ideas?

 

[2informaticos]

Please, open separate thread with your problem.

Looks to have a problem with 3V42_G3H power rail...

 

[lincev]

ok thanks with the answer I open another thread