I'm trying to get an old C128 working again. Lacking a C128 power supply, I've attached a C64's power supply's 9VAC and am supplying 5VDC from a bench power supply (with a 2A limit at the moment).
There's an old CRT TV attached to the Composite output and an old Commodore 1404 screen (which might or might not be working) is attached to the DB9 socket.
Switching the C128 on immediately draws 2A. Neither screen shows any kind of output. As far as I can tell with a quick check, the only IC that gets warm (but not hot) is the 7812. There are no funny noises or smells.
My question at this point is mainly whether it might make sense to try with a 3 amps limit?
(In case anyone happens to be hanging around 35C3, I'm at doubleoctothorpbuero (just type "double" in the C3Nav and it'll autocomplete). Thankful for any hints or pointers! :-))
Edit: thank you for the comments. I've added a question that should make it clear what I'm asking. But please keep it on hold for now as I'm trying to follow @'Brian H''s suggestion of finding a known-good device to test monitor and power supply with. Given that there's a PDP11 standing down the hall, there should also be plenty of at least C64 around here.