Merus Amp HAT stopped working

[BerglerAndi]

Hey there,

my Merus Amp HAT sometimes stops working. To Boot the Pi doesnt help everytime. Same error one different PiOS SD-Cards. For now im not able to fix it.

Behavior:

Starting a MP3 seem to work. Time is running, but there ist no sound. I used different player, which all worked a few day ago.

PiOS 32bit 04.04.2022

aplay -l

**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: sndrpimerusamp [snd_rpi_merus_amp], Gerät 0: Merus Audio Amp ma120x0p-amp-0 [Merus Audio Amp ma120x0p-amp-0]
Sub-Geräte: 0/1
Sub-Gerät #0: subdevice #0

cat /proc/asound/cards

0 [sndrpimerusamp ]: RPi-simple - snd_rpi_merus_amp
snd_rpi_merus_amp

alsamixer freezes and lock all values at 208 (see pic)

dmesg throws a lot of errors of this type:

ma120x0p 1-0020: ASoC: error at snd_soc_component_update_bits on ma120x0p.1-0020: -121

ma120x0p 1-0020: ASoC: error at soc_component_read_no_lock on ma120x0p.1-0020: -121

What can i do?

Best Andi

[BerglerAndi]

Very interesting: i made a PiOS with the latest 32bit legacy (04.04.2022) version. It works..

When i put in the old PiOs, which doesnt work last time, a player starts playing during booting and then stops again. When the Pi was fully booted, it doesnt work anymore and it shows again the behavior i wrote in the first post.

Back in the legacy version of PiOS -> it works..