820-01521 no sound by speaker.

[BCN_Techs]

Got this one. It was badly damaged by water. Repaired main lines now everything is working fine except sound.

Things that already tried:

U6400 reballed and after replaced
new sound board from working macbook air and not working too, (flex also had been changed).


I dont know what can i check now?

 

[2informaticos]

Is the audio codec recognized in System Report?
Possibly corroded traces, small coils, or resistors.
Headphones not working too?

 

[BCN_Techs]

headphone is working and audio codec is recognized ( up and down volume normally and sound bar is working but no sound from speakers)

 

[2informaticos]

Volume bar available on speakers only?
In such case, try other speakers.
You can check speakers continuity directly on the MLB connector; 4-8 ohms usually.