Many years ago, I had a 2nd hand TV which just hated to come on and deliver a picture. I 'convinced' it by applying a hard-back book to its top right-front corner...with slightly more force than you'd use to swat the dog with a newspaper.
   Kept that TV going for about a year....


(I also had a coffee mill which grew more reluctant to start....had to really pound on the little plastic switch. When if finally quit, I tool it apart to see the problem.....and realized it was only a bent piece of copper with a little corrosion. I sanded it down and bent it UP again with tweezers, and VOILA! Works like new now.)