How can I fix a Sky Digibox model no. BskyB 2400 Part 540E2304041 ?

My sky digibox is stuck in standby. I've tried unplugging it for 10 minutes and re-connecting to re-boot but it stays in standby using the on-box switch or the remote. The box acknowledges remote signals but still stays in standby. Before this happened it was reporting no signal on screen but in 'services' menu a good signal.
Is it fixable (electronic engineering background) with my soldering iron and Avo, or should I float test it?