Television and Home Theater

My Pioneer big screen is acting up.  There must be a loose connection somewhere, but I am not sure where to start.  As this thing is close to 10 years old I hope to get a few more months out of it.

When watching TV, I hear a pop and the screen goes blank.  For a while, once it "rested" a bit, it would come back on.  As expected this has increased in frequency.  I took the back off and found that if I strike PCB holder, it comes back on.

I have a samsung HC-P4752W  and am trying to set up the remote to operate my emerson vcr/dvd.. I have know i will have to put a dvd code in under dvd and a vcr code in to operate the features seperatly... however I can not find any codes that actually work... the tv and the dvd/vcr combo are the same age but no up to date codes from samsung... can someone help me here... the code has to be three digits...

 I JUST BOUGHT THIS TV LAST NIGHT. I BOUGHT IT FROM A GUY USED.THE TV WORKED FINE AT HIS HOUSE. I CHECKED IT BEFORE I PAID FOR IT.I BROUGHT IT HOME LAST NIGHT AND HOOKED IT UP.  THE TV CUT ON BUT IT HAS A BLACK SCREEN AND NO SOUND. I UNPLUGGED AND WAITED 10 MINUTES TO PLUG IT UP AND THE SAME THING HAPPENED. I ALSO WAITED TO THIS MORNING TO PLUG IT UP AND SAME THING HAPPENED. THE STANDBUY LIGHT BLINKS 4 TIMES.PLEASE HELP