Behringer UMC404HD Repair – Left Speaker Not Working (Found the Issue!)

I picked up this Behringer UMC404HD for only R850, and when I tested it, the left speaker output wasn’t working at all. So I opened it up and started diagnosing the problem. In Part 1, I show: Opening the UMC404HD step-by-step First checks on the board and connectors What looked suspicious How I traced the signal path The moment I found the likely cause of the issue If you own a UMC404HD or want to learn how to repair audio interfaces, this episode will help you understand where most output problems come from and what to look for on the PCB.