Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
I'm in the same situation with my ZX81 at the moment: white screen with no cursor.
Which finally was the damaged part in your case, the ULA or the Z80 ? I think that do you replaced one of them, tested the ZX81 and replaced the other one later it isn't?