This is the honest truth. I had a TV years ago that was acting up badly. I took it apart and had tubes tested, checked every connection I could see. I put it all back together and it was the same as before. I said, Well when all else fails, and smashed my fist down on the top of that TV, hard enough to bust it for good. You guessed it, The picture came in fine and it work fine for several years.
The schools made out great, Ed never got smart enough to see that