Don't think this is the kind of thing you can fix yourself, and even if you could it wouldn't be advisable.
Take it's not under warranty so need to find an expert, can't help you there.
As to the tube thing. In old tv the tube was the display - big magnet thing firing electrons at a screen, or something like that.
Now it's pixels which are told what to do. And from what I can gather tube refers to the thing round the side that illuminates the display - this would make sense if your picture is just dark and not otherwise damaged.
Bookmarks