820-00840 liquid damage, no audio output

[Yoel Ren]

this came in with liquid near u7370, trackpad connector , and u2890, cleaned it, mac boot up. but no audio devices.
there's very little information about audio issues on this model..

 

[Yoel Ren]

solved : l83_vcp is shorted to ground C6305

 

[Yoel Ren]

well speaker works, but headphone jack got a very loud static noise, but i still can hear the actual sound is played, i don have any clue where to start.., both side of L6602 and l6600 is shorted to ground, I have removed the filter, but one side still have short, its either the headphone jack connector or inside the board, am i correct ? or is this normal ?

 

[2informaticos]

Headphones output pass through L6606/8.
L6600/2 connect to ground, depending of what is inserted in the audio jack.

Did you try another audio board?

 

[Yoel Ren]

yes I did, it does the exact same thing.

 

[2informaticos]

So, L6606/8 have both 0 ohm?
You should have something more affected by corrosion.
Check all small coils and surrounding components of U6300.