A2442 - No sound over internal speakers and no video playback

[soeren]

I am facing a strange issue, I don't have any sound over my internal MacBook speakers and also the video won't start. If I change to my head speaker or via HDMI (speaker on my external Display) the sound works over the head speaker or Display and also the video starts (ex. youtube).

All happened after the battery ran out of power overall several days when I was on vacation.

I tried to remove the battery and then reconnected the battery, and then the MacBook Pro 14 2021 won't accept any power from my power socket. Then I removed one speaker, connected again the battery and then the laptop started up again, but still no sound. Then I changed the speakers, but still the same. Before the issue occurred, I had a strange cracking sound from my speakers.

I went to the Apple Store and they said, it might be the audio board, I also changed that, but without success.

I believe it might be an issue with the logic board. What could I do to find / solve the issue?

Thanks!

[PITERPENY]

is there sound through the 3.5mm jack? are the speakers identified in the system information?

[soeren]

yes, I can see the speakers in system information and also the 3,5mm works.

[PITERPENY]

I think then it's not a problem with the sound card! Try resetting the PRAM?

[soeren]

On a M1 MacBook? How?

[PITERPENY]

make a backup! then put it in DFU mode! and restore the mac! if everything works restore the mac from the backup! that's what i would do!

[soeren]

Will do, thanks.

[soeren]

I did a fresh install using DFU mode, still the same issue. Looks like a hardware issue, right?

[soeren]

I also changed the Audio Board, same issue. Any ideas?

[mon2]

Same fault here:

https://www.badcaps.net/forum/troubl...no-sound-issue

[soeren]

Thanks, I have tried all mentioned fixes, but I have still the same issue.

[soeren]

On the line from CR738 pin 1 to UR730 pin 7 (SPKRAM_E_BOOTP) there was probably a short circuit under the UR730 IC due to liquid. This caused the SPKRAMP_E to fail and destroy the other two SPKRAMP_D and SPKRAMP_F. They were replaced and sound came back.

But I still have this strange cracking sound in the right speaker. Could it be from the CPU signal?

[PITERPENY]

Usually the crackling comes from the speaker itself due to metal dust getting in. Buy the one that makes the crackling on eBay, it's inexpensive. I have a lot of them lying around with this problem.

and still it was worth mentioning about filling the audio area board. I think it would help the Rossman masters to help you faster. I think so 😂…

[soeren]

PITERPENY
What do you mean? I don't get it.

(..)
and still it was worth mentioning about filling the audio area board. I think it would help the Rossman masters to help you faster. I think so 😂…
(..)