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Have you tried unplugging for an extended period of time? ...say an hour or preferably more?
The idea is to simulate a soft RESET.
And then plug back in but use a different power source/outlet.
Yes please and would look forward to an update later or when able.
This would be the simplest to try as all others would be internal and would require the use of a multi-meter and even perhaps a soldering iron.
And great if considering a DIY (do-it-yourself) repair approach.
Sorry to hear the lack of developments.
Then it would confirm the internal hardware issue.
Would you then push through with the DIY?