I repaired a SNES today that displayed picture but had no audio. After I replaced the two common IC’s that cause this issue,I still had no audio. I then looked further a field and scoured the motherboard for anything obvious. I found 5 traces that had trace rot and I repaired them.

After repairing the traces I plugged the system in and was relieved to have sound back on the system

Another great repair and another retro console saved from the rubbish bin