820-00239 not turning on.

Yoel Ren

Member
hi, this board came in with a bit of liquid damage at ub400 and ub300, both of these corresponding port will stay on, while the other two looping.
i replaced both ub400 and ub300, and i got 20v on all port now.
i tested it in chassis and it did boot.
i leave it one day, and next day it doesnt turn on anymore.

when i plug usb c charger, it will go 20v, current fluctuating like its booting, and i did get usb activity for a few second, and then it will stuck at 0.08, no more usb activity.
all port behave the same. any clue what to go for ?
 

2informaticos

Administrator
Staff member
Something else corroded on the board, or accessories.
Some I/V sensor may be triggered.
Can you turn it on in SMC bypass mode?

Also test the board alone, disconnecting anything; keep only charger.
 

Yoel Ren

Member
smc bypass always boot fine.
anyway, the problem was smc_lid_right.
i replace the 3 leg ic at J5260 that doesnt produce hall_sensor_right, and mac boot up fine now.
i thought smc_lid missing only dim the display but still produce usb activity ? ( this is solved, but just curious.. )
 

2informaticos

Administrator
Staff member
You should noted that all MacBooks boot up even with lid closed; you can hear the chime, when available.
SMC_LID controls image/backlight and trackpad/keyboard activity.

On Windows side, laptops don't turn on at all, if lid is closed.
 
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