For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
i have this board very clean, no green led (PSU and official charger)
DCIN_ISOL_GATE = 6,8V
PP18V5_DCIN_ISOL = 18,5V
R7012 = 68Kohm
no the board don't turn on.
i have just the board and the magsafe board. i haven't green led, i don't connect the battery, it's easier to measure voltage on board.
SCL/SDA lines at 0V, SCL/SDA=0,5V in diode mode
the customer close the mac open for the night and the morning nothing, the mac doesn't start.
PP3V3_S5 = 0V
Oops, this is A1502 machine, no LIO board there, sorry.
RIO board present instead.
"SCL/SDA lines at 0V"
Are you sure?
You've said 3V42_G3H is present; where these lines are pulled-up through R5380/81.
Impossible with reported diode mode readings; unless both resistors are open.
Please check again.
ok i change the board and now i have the green led but nothing.
SMC_MANUAL_RST_L=2,8V strange no?
maybe it's U5110? or SMC?
First clean J6100; remove if needed.
If SMC_RESET_L still low, remove U5110 and check it again.
If not present, be sure R5100 is good.
If still low, then remove R7100 and check it again.
SMC is the last thing to test.
I change U5110 and R5100, sometimes the SMC_RESET_L come to 3,3V and the mac start normally.
I try to remove R7100 but same, i have SMC_RESET_L=1,4V
When i remove U5110 and R7100, i have fluctuant from 1,4v to 2,8V on SMC_RESET_L
If you are sure about J6100, only SMC remains.
There could be corrosion under it, or internal problem.
Should reball it first.
Once SMC is removed, check if SMC_RESET_L is steady high; with all other components resoldered.