820-02016 no sound from speakers

[ajdoc]

Audio board was affect by liquid.
There was webcam connector on display board badly damaged and LP670 melted (client don't care about webcam).


Replaced audio board, it boots but there is no audio from internal speakers.
When pressing vol UP/DOWN I see on the screen volume change.
Audio input is working fine.
There is audio output on earphones.

Check with another speakers and the same issue.
Flex which connect Audio board na logic board is in great condition.

JR820, UR600 area, UR900/10/30/40 area, UD010 area, JE900 diode mode blues looks correct.

Any idea?

 

[2informaticos]

Check diode mode to ground at pins 11 & 13 of RIO connector.

 

[ajdoc]

JE900/11 .383
JE900/13 .320 (boardview says 0?)

 

[2informaticos]

Check other data pins and compare with good board.
Also check around U600.

 

[ajdoc]

I got fully working A2337 and swaped board and the same issue so for sure something wrong on the board.

Compared JE900 in diode modes and only on one line got strange reading:
JE900/3-6 PP3V3_AON_VDDMAIM .320 (good board .178)

"Also check around U600."
Cant find U600 but I think you mean UR600.
All diode mode reading around UR600 are the same with known good board.

 

[2informaticos]

Yeah UR600, sorry.

Check UR900/30 and their adjacent resistors.
UR910/40 are also involved.