820-3115 No audio devices.

[deephouse]

Hi, 820-3115 with liquid damage, does not detect audio devices. No input/output devices found. I can't find out what the problem is. There was serious damage around the U3300, and I had to put in several bridges to power the L6611 and R6610.Maybe something in the layers themselves is hurt!? I'm asking for help.
LG

 

[2informaticos]

U330 is not related with audio device; is just power switch for SD Card.

Check for corrosion U6200/01 area.
No audio devices at all on System Report?

 

[deephouse]

There is no sound at startup, the system does not detect any audio devices. Power supply feeds 4.5v in on the audio codec chip. To be sure, I replaced the U6200/01. I think everything is present in U6201

 

[deephouse]

Apple diagnostics shows no errors.

 

[2informaticos]

I expect some small resistors, or coils corroded.
Check inlcuding for corroded traces.
Check all powers around audio codec and its reset signal too.

 

[deephouse]

I solved the problem - the motherboard is rubbish.
I found that the connection was broken with U1800-R6211 / HDA_SDIN0.
Thanks for the help.