Macbook Pro A1286 power on problem

[Simpletek]

Hi all, i have an issue with this Macbook, MB code 820-2850

Magsafe light always green, battery not charging, pressing power button nothing happend....

tried smc bypass, not work

take apart motherboard :

tested voltage, magsafe connected 12v on PPBUS_G3H (all 12v rail) changes between 7v and 12v continuously

only battery connected 12v ok but no power

tried 16,5 volts from universal notebook adapter, soldered on ground and first fuse, 12v rail ok and not change but no power

any ideas?? thanks

[spidey]

Re: Macbook Pro A1286 power on problem

is there any liquid trace under keyboard ?

[Simpletek]

Re: Macbook Pro A1286 power on problem

is there any liquid trace under keyboard ?

No, MBP seems like new....

[xalu]

Re: Macbook Pro A1286 power on problem

Hi, I am also looking for the board view

[highpulse]

Re: Macbook Pro A1286 power on problem

chek with boardview , were to find SMC_ONOFF_L or SMC_ON_OFF_L
you will see ++3ghot power signal 3.42 volts
short with GND , it should turn on
reove keyboard , and remove battery , without battery macbook should turn on alone as well
if not , could be bad SMC or bad SMC contact
meanwhile here it is , BDV and schematic for the board you need

[MikkiG]

Re: Macbook Pro A1286 power on problem

Thanks for this!

chek with boardview , were to find SMC_ONOFF_L or SMC_ON_OFF_L
you will see ++3ghot power signal 3.42 volts
short with GND , it should turn on
reove keyboard , and remove battery , without battery macbook should turn on alone as well
if not , could be bad SMC or bad SMC contact
meanwhile here it is , BDV and schematic for the board you need