Hi
If the audio is distorted or could be a SOC on the main board but we should leave that as a last resort
I would open it up and check for any bulging or popped capacitors ,also if anything looks strange I would check it with a multi metre to check if there is a short of some sort
Also try reseating any connectors (possibly cleaning them with isopropyl alcohol as you go)just in case it’s a dodgy connection
And check if the issue persists
If the issue persists let me know and we can look into in further:-)
Hopefully this helps
Any questions please ask
Thanks:-)