820-3115 chime speaker sub not working

Gmorb

Member
already tried a known good speaker and i get no sound from it. no chime.

j6703 does get voltages under 1v each pin gets. but on a known good board those pins get no voltage at all

tried swapping out u6620 and u6610 no luck. machine produces sound from the small speaker but not sub
 

2informaticos

Administrator
Staff member
Sub and right speakers share the same connector.
You must get similar DC voltage on both.
Did you try another speaker?
 

2informaticos

Administrator
Staff member
Maybe U6620 is not properly soldered.
You can also change U6201...

Check traces between the two chips.
Also C6620/21 and R6622.
 

Gmorb

Member
Switched out u6620 changed u6201 checked traces for c6620/21 and r6622 even changed out c6620/21. Still no luck but i did notice that u6880 and sorrounding resistors had water damage as well.
 

2informaticos

Administrator
Staff member
U6880 is for microphone.
I suppose you still have some resistors, or small coils affected by corrosion in that area.
Various components related with tip detection can trick the audio codec.
Also corroded trace could be...
Peel out the black sponge near BIL connector and clean the board there.
 

Gmorb

Member
Ran board through ultra sonic and replaced some suspicious resistors and retraced line but still no luck. Any other ideas?
 
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