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A model number would help but many have a self check; when turn set on and power light (green?) comes on and a few seconds later off on the front of the set press and hold both the menu and input (label may be source) for at least 5 seconds and release both.
Power light will blink a two digit error code like 1 blink, 2 blinks and pause and repeat it for a total of 5 times.
If you have unplugged the set it will always show the 1,2 above which is no error found, power it back and turn it on again, when fails do the check again.
set has a self diagnostic---after set does shut down press and hold MENU AND DEVICE(INPUT) buttons on front of set for 5 seconds----if 2 blinks, a pause and 2 more blinks: this is short protection error code---The set does use 2 Stk394-250 and each is protected by a pico fuse in the power supply---if either fuse is blown the set will shut down(it detects no voltage or missing voltage;) It is not uncommon for a shorted IC to cause this problem; if you locate the STK's look carefully at the resistors around them---if any are discolored or burnt---you have found your problem.
t does sound like a bulb problem, either its over heating and shutting
off to protect itself, or its already shot. Give a TV repair shop a
call and see if they can give you an approximate price, then decide to
ditch or repair it.
The repair tech is wanting to take alot of your money, you can get the entire deflection baord which has the flyback on it remanufactured for about half of what he wanys to change the flyback. Heres alink leave them a email with your model number they will send you a quote to have your deflection D board rebuilt which carrys a full warranty. heres the link. http://servicemanuals.vstore.ca/