Steamdeck auto_null sound and microjack are not working

A few days ago I opened my Steam Deck to change the thermal paste, and when I put everything back together my Steam Deck showed "null" on the sound scale. When I tried to connect headphones through the cable, it didn’t work either. I already tried reinstalling SteamOS and checked PulseAudio. The Steam Deck doesn’t detect the speakers, but as I understand, if the problem were with the speakers, my headphones should still work. But it’s not the sound card, because in that case the sound buttons wouldn’t work