820-00164a power button doesnt work

Yoel Ren

Member
so I have this board, doesnt look liquid damaged, i press power button, the macbook will be shutdown, while at the same time, orange light go green light, which I have read before, is smc_Reset_l being dragged by smc_onoff_l is it ?
I have tried known good bottom case with new trackpad and keyboard flex but still the same, so I assume it will be logicboard problem
smc_onoff_l is 3.4v, and drop when shorted, I have tried changing u5110
note : I have tried shorting power pads and power button from keyboard, still the same
 

2informaticos

Administrator
Staff member
Post SMC_LSOC_RST_L level.
Try R5115/16 pads (instead of power button), with trackpad flex disconnected; same issue?
 

Yoel Ren

Member
smc_lsoc_reset_l is 380mv, the caps is not shorted
i have tried with r5115/16t pads with only board , but still the same
 

2informaticos

Administrator
Staff member
"smc_lsoc_reset_l is 380mv"
That is the problem.
Everytime you pull down SMC_ONOFF_L, you trigger SMC reset in fact.
If still low when remove C4836, then bad U5110, TP flex/board, or J4800.
 

Yoel Ren

Member
I tried removing c4836, replacing u5110, and removing the j4800 and tried smc on off, but smc reset_l is still dragged down
 
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