Hardware GBA Without Sound

[kerobscure]

The sound of my console does not work, it's an AGB-001 with 32 pins

I have tried:
- Changing it to an SP
- Inserting jack (If it works, although a very loud hum is heard)

I'm desperate, I had planned to do the AGB-101 and if I do not solve this I think it will not be possible...