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In standby mode (red led on/after the led stops from blinking), press "Display", "5", Volume (-)", "Power on" on the remote control in sequence, self diagnostic screen will be display, let me know the what is on the screen to diagnose where the fault came from.
The 5 blinks indicates a White Balance Failure. This involves checking voltages and components tied directly to the CRT. I would not suggest any attempt for self repair. The cost for this repair should not be significant. Figure a parts cost in the $30-$50 range at worst.
3 years ago, i had the same problem with a samsung 36", when i switched it on it would stay on for around half an hour, i tried to switch on straight away, but it wouldnt, i had to leave it for an hour or so, then it would stay on for about 5 minutes. And the same thing the next day (half an hour then 5 minutes). I left it into the repair shop, it had to get a circuit board replaced at a cost of £315, dont know how much it will cost to get fixed now, as i could buy the same tv for a little over that now.