In days of old Al, that was a reasonable assumption. But things have changed. There's certainly no power to some of the lights - but sadly for the OP, his internal fuse(s) probably are OK
Last night I was looking at that PDF service manual. Even the block diagram (which simplifies things) is surprisingly complicated for what, on the face of it, is a simple budget amp. Once you get into the full circuit diagram.....there are volt regulators / control ICs etc....several things that could be causing no lights / sound.
Bring back the simple old days I say