[minnie]

Pull the screens off and see which tube isn't lit of one isn't and look into the tubes to see which one has the dot in it.

[niper]

I just got this TV from a neighbor who moved out and he said the TV worked fine, but one of the tubes burnt out, it was either a blue or a green one, I don't remember what he said. He also said it caused the green and blue colors to not display properly. So I turned on the TV and it works, and there's also a quarter-sized blue dot in the middle of the screen. Not sure what that is either. Are either of this viable problems that can be fixed?