Sounds like some bad electrolytic capacitors on its inverter board. When caps on the power/inverter boards go bad (and they use cheap caps so these fail pretty often) the TV/monitor will flicker a lot for a while until it "warms up". The caps themselves usually (but not always) will bulge at the top (you can see this in the picture here: http/www.capacitorlab.com/visible-failures/ ). I've fixed a number of TVs and monitors by replacing bad bulging caps with quality ones. If you are comfortable soldering components (they won't be surface-mounted) then head over to badcaps.net, join-up and post a question listing your monitor's make/model and symptoms: https/www.badcaps.net/forum/
Here is a basic guide to replacing bad caps on a specific computer monitor (the process will be a little different but similar on your TV): http/www.ccl-la.com/LCDrepair9.htm
If that looks too daunting or you're not comfortable with a soldering iron or general component repair then I would start saving up for a new TV. The problem won't get any better, only worse. A repair shop would replace the entire power/inverter board which would cost too much. Unfortunately, most TV repair shops won't do individual component replacement - they just order an entirely new board (complete with the low-quality caps). Hope that helps! Good luck!
MERGED QUESTION Question from kktckr : "I have a older 55 into vision vary heavy it works great after about @ hour its fuzzy then works great"
I have a Vizio 55in it's an older one very heavy glass front works great after about a half hour and then it turns on clear but it's real fuzzy for about an hour then it works great I hate to get rid of the TV please can somebody tell me what part could be it