820-02098 no audio

[Kyle93]

No liquid damage and board looks pristine. No audio even though sound can be adjusted from keyboard and under sound output MacBook Pro Speakers are listed as built in.

When playing a YouTube video the timer for the video progresses along with the captions but the video itself remains frozen with no sound.

What should be checked next??

 

[2informaticos]

Any change when you plug headphones?

 

[Kyle93]

Yes video plays fine and sound works when headphones are plugged in

 

[2informaticos]

Check SPKRAMP_RESET_L and SPKRAMP_INT_L lines.

Compare diode mode readings around audio amplifiers with good board.

 

[Kyle93]

SPKRAMP_RESET_L diode 0.284

SPKRAMP_INT_L diode 0.284

no good board here to compare readings

 

[2informaticos]

Just in case, save data and try DFU restore.

 

[Mortentoft]

Does SPKRAMP_RESET_L have 1.8v while on?

 

[2informaticos]

1.8V should be good; pay atention to end "_L".

 

[Mortentoft]

1.8V should be good; pay atention to end "_L".

So right - stupid me...

 

[Kyle93]

No change after successful DFU restore with no errors

 

[2informaticos]

Connect at least one known good speaker.

Should be really strange to have all audio amplifiers bad.