Sharp SX-9800 no power

Might be pointless repairing this amp as it was not that good so I read online, but I'd still like to get it up a D running again.

It just will not power up. I have seen others powering it up on utube without the preamp and not using the remote turn on cable? I think it is, not sure..

I've tested the PSU the best of my knowledge and it seems ok, just do not know the voltage as the lead coming out the other end is a clip on to the main board to give it power.

Other than this, it's all I've done.