Marshall AVT150 - DC volts on output?

[antieatingactivist]

Hi, I'm working on my friends avt150. It was a fuse popper. I determined that the output IC's were shorted. I replaced them and powered the amp up with a light bulb limiter. It runs with no short, the only problem is that there is -37 volts on the speaker output! This seems wrong and I am afraid to go any further because of how finiky these chips are. I also connected a dummy load to the output and it lit the bulb up bright in short pulses. Any help would be appreciated.

[booj]

Are the output chips shorting to the heatsink? Or is the heatsink shorting to the chassis?

[antieatingactivist]

The chips are insulated with the mica. I confirmed with an ohm meter.

[antieatingactivist]

Anyone? I know this is the gazillionth TDA7293 thread on here.

[Ronsonic]

Both supply rails present and roughly equal?
Solid ground?

Check the shielded signal line from the preamp, is there DC on that?

[antieatingactivist]

The DC supply volts were equal. I will check the signal for DC volts tonight. Thank you for the reply.