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Thanks very much all - I'll start with the capacitors and see where that leads. There are a few test points, and I've found 5V at the 5V test point which a good start. However there are a fair number of other tests in the technical manual but I don't (yet) have an oscilloscope. I'd like to...

Thanks! Unfortunately I do think there's something else wrong. I've got a new battery pack in there and given it a decent charge, but the behaviour is the same. All I can get out of it is a blank screen, although there is clearly some power getting through as you can see pixels on the screen...

Hi all I've recently got into the early Epson portable computers, and got hold of an HX-20 (which works perfectly) and most recently a PX-8 / Geneva. This is proving a bit more of a challenge though and I was wondering if anyone had any pointers. I'm aware of the various issues with batteries...