Television and Home Theater

I have 65-inch Mitsubishi projector tv.  I plugged in my still picture Sony camera and the screen went black.  I did this before with no problem.  Now I  have a very  snowy picture on some channels; but most channels are black and there is voice.  If I switch my tv to input from other devices, the screen is blue.    Any help to this problem would be appreciated. 

Help Me, Larry Ive seen You find the fix for all kinds of problems.  

Hello, I have a RCA tv model 20F420T, first problem was the set turned off by itself after 20 or 30 minutes, i guess caused for overheating of some component because the time decreased to 10 to 15 minutes after turned on each time.

I check solder points under the board and found a crack solder in pin 11 of flyback. I resolder all terminals of troughole components on the board and the problem still. I change C413,C411,C408,R421 and R510,R511,R512 and C504 on CRT,I check B+ and 200V is ok.