When tv get warm the picture go out until it cools and then I can turn it back on

It sounds like the CRT may have a intermittent short in it. Many times the impurities or oxidation occurs and these impurities are conductive. When the set is first turned on it shows the flaw and as the CRT warms up the impurities react to the heat and the short is removed until the set is turned off and cools down. The only cure would be to replace the CRT. Do to the cost of doing this I would just use the set until it ceases to go to a normal picture.
I hope this helps,
Skyassoc

if you bang on the TV or try kicking the very center bottom of the tv and it works or flickers you got a loose solder connection somewhere on the board. I got the same problem. When it warms up the solder, around what ever pin it might be, makes better contact. I am looking into the problem and will post my finding when i figure it out.

Change the capacitors first per the instructions in the link below. Symptoms could be anything from high-pitched hum to no picture at all. On these defective models, I would start at the caps and work back. It won't hurt to replace them anyway.

http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen

Sounds like you need a new focus block, they are actually cheap. If you need a link on where to get one let me know.

I am having a similar issue. Did you ever figure out the problem??

do you see any tiny lites you see on the end of the tubes or crts are the filiments?

You have a bad capacitor in your power supply.

Im guessing the the convergance ic are bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Check the main filter cap and B+ line.