The files appear to be P-Cad format, .sch is just a convenient extension that a lot of pcb software uses. I imported the schematic in Altium and it shows up. If I attempt to load the schematic with the library (.lib) file, it also shows a nearly empty PCB and a schematic without symbols - I'm...
It's probably detecting DC on the output of one of the channels. If it was being overdriven before this happened, it could be a shorted output transistor. Otherwise, hard to say without opening it up.
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