820-3476 no microphone

[arnonabuurs]

Hi guys, I have an 3476 that we repaired before U8030 shorted, a little hole in the board. We wrired a new U8030 and Mac worked fine. Customer returned now with Mic not working. We tried another Mic from another Mac, same it shows no activity. I checked the lines 1,2,4 on J6601 but no short circuit here. What can I check more?

Forgot to mention, the Mic is recognized in the settings, audio also working fine.

 

[2informaticos]

Do you get correct 3V3_S0 at J6601?
Did you try your test USB OSX?

 

[arnonabuurs]

3.33v at J6601.
You mean Apple ASD test? I did ran a test from external USB drive if thats what you mean, same issue. It was high sierra though, I read some people have issues with that OS and the mic?

R6332 = 75 ohm

Edit: not working in all OS. Ordered a brand new mic to make sure im using a good one, will report back