Memorex MT2274 27" TV "random character" Questions

Letters show up on the screen like someone is typing random letters numbers and punctuation. How can I fix this? I'm getting the same thing - I've had my Wega for about 10 years now...I wouldn't ...

...random character on the right. And one time yesterday it was a large black box the covered most of the viewing area. Pressing any button on the remote makes it go away but it may come back in 2 ...

random assortment of closed captioning comes on. Usually it is blind captioning with an echo. So not only does it echo, but I hear everything the person/character is doing because it is being narrated

Can't shut off closed caption My closed caption randomly turns itself on and puts a black bar on the screen with jiberish characters. It will go away if I change channels or the set off. I have tried ...