hi all , just wanted to share my latest and crazies macbook repair.
i got non working board from a friend and generally when it write the problem 99.9% is it.
if he say no backlight then most of the time it's the blown fuse or bad ic backlight.
this time i got this 820-00165 with no backlight sticker in it. so i went straight to test fuse and after fuse was ok i replaced backlight ic as it's very cheat (2€).
after that i still see no backlight, but then noticed lvds connector got corrosion under bl pins. i replaced lvds connector but still no backlight. i measured then voltage on bl diode and found both side were 0 vol....
i said maybe it is not posting and infact connecting external lcd i didnt get anything.
i inspected the board and found 3 capacitor near smc that were reworked with some corriosion reside. i cleaned everitning and checked if pad under caps was ok. after all was goot i was almost giving up . a clenaed board in the ultrasonic didnt show any under pads corrition so u cant know exactly where was the problem before they cleaned it.
then i started touch whole board while fan was spinning... u know one finger with some very small wet in it and applying some pressure near the red marked zone and with my big surprise while touching i got apple logo and after a while i got folder mask.
when i power off then on the board i got again the no post error... i touched again the board and when i touched the area near u3210 i got image again.
i think problem was or u2940, or smc itself that was heated near it with hot air and with the glue still near it.
i then applied flux in the red are and started reflow all component near it lifting and put back in place and also did a smc reflow.
after that mainboard is working fine. i power on off and it works like normal...
hope this can help
ps: this is not the actual board picture , it's just to show the area.
i got non working board from a friend and generally when it write the problem 99.9% is it.
if he say no backlight then most of the time it's the blown fuse or bad ic backlight.
this time i got this 820-00165 with no backlight sticker in it. so i went straight to test fuse and after fuse was ok i replaced backlight ic as it's very cheat (2€).
after that i still see no backlight, but then noticed lvds connector got corrosion under bl pins. i replaced lvds connector but still no backlight. i measured then voltage on bl diode and found both side were 0 vol....
i said maybe it is not posting and infact connecting external lcd i didnt get anything.
i inspected the board and found 3 capacitor near smc that were reworked with some corriosion reside. i cleaned everitning and checked if pad under caps was ok. after all was goot i was almost giving up . a clenaed board in the ultrasonic didnt show any under pads corrition so u cant know exactly where was the problem before they cleaned it.
then i started touch whole board while fan was spinning... u know one finger with some very small wet in it and applying some pressure near the red marked zone and with my big surprise while touching i got apple logo and after a while i got folder mask.
when i power off then on the board i got again the no post error... i touched again the board and when i touched the area near u3210 i got image again.
i think problem was or u2940, or smc itself that was heated near it with hot air and with the glue still near it.
i then applied flux in the red are and started reflow all component near it lifting and put back in place and also did a smc reflow.
after that mainboard is working fine. i power on off and it works like normal...
hope this can help
ps: this is not the actual board picture , it's just to show the area.
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