MBA 2020 Intel NO audio output via internal speakers 820-01958 HEADPHONES WORK

Device arrived with minimal liquid damage to mic board.
After hardware replacement device has no internal audio but headphones work.
Diode mode j6100
pin #32 SPKRAMP_INT_L produces 0.002
pin #33 SPKRAMP_RESET_L produces 0.002.

guest account no change
checked sound in settings output recognizes internal speakers and headphones when plugged in
system report audio shows normal output.
activity monitor stopped and restart "coreaudiod" and checked /Library/Preferences/Audio folder/files is present.
Cpu usage spikes to about 6% when attempting internal speakers but only less than 1% when using headphones.
tried known good housings
Any ideas?


 
Last edited:

2informaticos

Administrator
Staff member
"Diode mode j6100
pin #32 SPKRAMP_INT_L produces 0.002
pin #33 SPKRAMP_RESET_L produces 0.002."
Check without audio cable connected.
I had one 01521 with the same problem.
In my case, I found SPKRAMP_RESET_L shorted to ground inside T2; placed near PPBUS_G3H on J6100.
 
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