MacBook Air 13" 2011 820-3023-A sporadically loses green light/does not power on

[Inwerp]

Hello everyone.

Sorry for writing it before measuring everything, but during the first-look test laptop booted and i've decided to extract customer's data before proceeding since it started wit the battery disconnected.
i have two days off, so i am reading schematics to figure out what could be a reason for such a weird behaviour.

J2550 had corrosion around pins 44-64, nothing suspicious more.
triggering SMC reset turned off orange led instead of switching it to green.
could not find schematics for charging board (io board?), so i would appreciate some tips for onewire troubleshooting.

 

[dukefawks]

No schematic for IO board. The first thing here is to inspect the J4700, IO board and flat cable for corrosion, best to just replace IO board/cable in doubt.

 

[Inwerp]

No schematic for IO board. The first thing here is to inspect the J4700, IO board and flat cable for corrosion, best to just replace IO board/cable in doubt.

Thanks, i will test it with other board as soon as i get one.
is there some MB Pro board which could have a schematic close enough to troubleshoot it instead of simply replacing it?

 

[dukefawks]

There are no diagrams for any IO boards for this stuff. These are $15 so no use to even waste 10 minutes on them. Only thing you can quickly do is inspect the connectors for corrosion.