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plivesey · (This post was last modified: 06-03-2019 11:46 PM by plivesey.)

Further information.

The batteries in it were dead, but not leaking. This was a surprise as they should have been good, the calculator having not been used much since they were put in.

Anyway, I replaced them with a brand new new pair. I flashed it once with an old firmware (by mistake) and it worked. Repeated the process with the latest firmware and that's when it died.

Having checked the new batteries now, they're both at ~2.7V

Took the back off to see if anything was obviously amiss and a few of the tracks leading off from the left hand battery terminal where it joins the PCB appear a little corroded. Again, no signs of battery leakage though.

I'm thinking it's not coming back from this and so it's off to the internet to get gouged for a new HP 30b.