An upgraded wifi enabled Alexa enabled 32 inch TV is $99 on amazon(I have one that I built into 1963 console TV cabinet. I paid 99 bucks shipped)
Do not spend a moment diagnosing your current TV.
But
If you insist on diagnosing it:
Plug it into shore power seperately and see what it does.
Like, run an extension cord from your house to the TV only.
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