MACBOOK PRO a1286...part no:- 820-3330-B......not turn with power btn

[NIKHIL@1997]

Hi...i have another macbook pro a1286...part no is 820-3330-B
The problem is ..not turn on with power btn...when i remove the battery ..its turn on automaticaly...everything working fine..also keyboard too working
but once i turn of the mac its not powering on with power btn....i check another keyboard ....same status

 

[NIKHIL@1997]

when i check the MB i found corottion on R5072 & R 5082(these resistors are missing from board)....i replace the resistors and clear the area...
but again same problm.....

 

[2informaticos]

SMC_ONOFF_L steady high?
If not, check R5070.

Does the board start with R5015/16 pads, instead of power button?
If yes, check R5710.

 

[NIKHIL@1997]

SMC_ONOFF_L showing 3.4 v
also try to short R5015/16....still same

 

[NIKHIL@1997]

another intresting thing is ...when first time turn on the device(autiomatic on)...during that time if i press the pwr btn long time...the system will be of...then again i trying to switch on the device with pwrbtn..its not turn on

 

[2informaticos]

Check SMC_TPAD_RST_L level.
Also try R5015/16 pads, disconnecting keyboard.

 

[NIKHIL@1997]

HI....the problem is solved.....before i told you there is corrotion on R5072 & R5083...when i check the board there is 3.42 v missing on one side of R5072..i make a direct jumper from 3.42 line ...now the board is ok(may be track cut )...thanks for your support

 

[2informaticos]

Thanks for feedback, was a really strange issue.