I have a 90 inch Visio television it has a black dot on the left-hand

I have a 90 inch Visio television it has a black dot on the left-hand

I have a black dot on my 90 inch Visio TV it also has some white spots in the left-hand side corner And when I turned it on yesterday it started to make this crackling sound and the TV turned off when I turned it back on the sound was not there can you tell me what’s going on and what I can do to replace anything that’s wrong with the TV

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