I tried JURB's technique yesterday and 8 resistors burned up. Use
caution

The burnt resistors should point you to the root cause of the failure.
With no load and no outputs there is no reason for anything to smoke if
the circuit works properly. Had the outputs been present they would
probably short first and blow the fuse before anything else could
happen.

Sorry about the eight resistors, but they should point you to a
component which might test good on an ohmmeter but gets leaky or shorts
at actual operating voltage.

Remember DO NOT connect speakers or a dummy load when you do this, it
WILL blow the drivers.

JURB