On Tue, 20 Aug 2024 00:38:38 +0100, Adam Sampson 
wrote:

>Having dismantled it, the reason was that it uses a 7805 regulator with
>a resistor divider to lift its ground reference pin a bit, and the
>resistor values had drifted considerably.

I have been thinking about various failure modes that could possibly
cause an overvoltage condition. This is the only one I have been able
to think up. Thank you for confirming.

Not all versions use these voltage boosting resistors, though, so the
myth that all of them will fail, is still on thin ice as far as I am
concerned.
--
RoRo

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