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Thing is, when you are close to the TV, do you HEAR anything going on? SOmetimes when the ube or one of its "beefy" parts are going on the fritz, you will hear things "click" and discharge, or make funny high pitched noises that are different than the typical ones.
So all the things mentioned here are possible, but have you tried the easy things first:
Wigling the power connector (at each end).
Wiggling, turning the AV connnections.
Hell, one TV of mine needed a good whack to get the horizontal, what do you call it (the thing that makes the cathode ray scan horizontally across the screen), to make it work. It was probably a loose connection.
I am not recommending you whack the side of your TV, but sometimes when things get old, a few broken/loose contacts can mae the performance kind fo sketchy.
My Sony TV (just a tube tv) that I bought in 1996 started blinking a few weeks ago. Initially, it was just when we turned it on after it was off all night but now it blinks intermittently all the time and is very obnoxious. We have a dvr and thought at first that it was a problem w/ that. But when we unplug the dvr, the tv still blinks. Also, it blinks somewhat on all settings (for dvd or vhs) but most often when the dvr is on. So it blinks occasionally when we're watching a dvd or a vhs tape but ALOT when we're watching tv.
We are considering getting a new tv but don't want to unless we know for sure that the problem doesnt have anything to do w/ our cable /dvr connection. True, the tv still blinks when they're disconnected from it but it also doesnt make sense to us why some shows blink more often than others if it DOESNT have anything to do w/ the dvr.
whew!
I have the exact same problem! Mine is a Sony TV from 1995 though, hehe. And we also have a DVR and out TV also seems to blink more on certain channels or while DVR is recording. DirecTv guy came out today and couldn't find a problem. He said it was our TV. Did you ever fix your problem? THANKS SO MUCH!!!
Sincerely,
Deb
There is likely an issue in the high voltage section. Could be dust or something causing an intermittent short, or failing insulation, or a number of other possibilities. Your best bet is to just replace it. Put a wanted ad on craigslist and be prepared to be inundated with people wanting to dump their non-digital sets.
Now, about home remedies - unless you are an electrical engineer there are none. The high voltage section of a tv with a cathode ray tube is about the most dangerous place to play in your entire life. There are capacitors that can hold charges for long periods, and when the system is energized, think of it as one of those zapping bug lights designed to kill humans. IF you don't get yourself killed witht he high voltage or capacitor discharge, you still have a chance of breaking the thin neck of the tube and causing an implosion that will embed shards of leaded glass in your body and eyes. I know what I'm doing and have replaced video driver boards and all that good stuff, and the back of a CRT still scares the heck out of me.
I so disagree with replacing a set because of nervous Nellies. The first thing taught to any Electronic Technician is how to troubleshoot a television. Sure there are some that have no business in repair, but televisions are definitely repairable items and usually the parts are less than $20.00. It's usually is the labor time involved that determines whether the set is worth repairing. Most sets today don't even use the CRT that you so dread and if it does, the sets of today are so much different than bug zapper you describe.
I think I'd just take the TV to Best Buy and get a new one. It'll probably use less energy, IMO.
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riiiiiight 
