I had the same problem, where the red CRT was shorted out. It kept on getting redder and redder until on day I turned in on and it was all red. CRT's can be pricey so it would be best to call a repair tech to diagnose the problem. Most will do in home service so you probably won't have to cart the tv somewhere. Once I replaced mine it's worked great ever since.
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The set is tripping and can be due to problems in the drive or the output section. You need to disconnect power to trace this and requires some knowledge of the circuit to go about. Since the set cuts off there will not be audio as the power is cut off in protection.
It indicates a short at the Red picture tube--set has three picture tubes and each has a socket which processes signal to each tube--each has a single IC chip---in your case either the chip on the red board or the red tube.
If a bright red screen the set will detect something is pulling way too much current and shut the set down for protection---called a shutdown circuit.......
Remove back see if you can get to tubes top lenses clean all 3 from dirt/dust/ After cleaning off lenses there is a black control box has 3 controls on top 3 on bottom these are to adjust each tube R-G-B Tubes screen/ focus adjust one tube at a time--- Like to adjust red turn g,b.screen drive off turn red up adjust focus to a clear picture ,then green same and blue If you turn screen up to much it will either shut off or you will see Drive lines adjust back down.OK after doing this turn color off in menu adjust all 3 screen controls untill you have Black and white picture try to adjust as close as you can to get bl/wt picture when that is done now turn color on and you should have alot better picture.
Check the pins with a strong magnifying glass to make sure they are solderd correctly with none of the pins bridged with solder, then recheck all the wire connections to make certain they are correctly hooked up.
sounds like u are losing green? is that right. could be loose connections somewhere because it works at start up then fails when it heats up. Look in the yellow pages for a mitz auth servicer or call mitsubishi for one near u.
use the advanced options page and reset the factor blue and red convergence defaults then do re apply the auto color defaults color at first it seemed very red (which is good because red was the missing factor in the green picture) but after reseting all the color and tints to the normal ranges I then reset the color auto correct again and all seems fine.