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This sounds like a post 2000 model TV. That IC on the CRT neck board is actually the three video output transistors rolled into one package. The first thing I would do is adjust the screen (G2) control on the flyback. Some of the newer Philips/Magnavox sets have circuitry that will shut the set down if the G2 control is not set properly. Also, if you have access to a CRT tester, check the tube. If it's weak, that will be your problem. If the problem is still up in the air, you'll have to obtain a schematic and check voltages in the video output stages. Some sets have a low ohms resistor in the 200 V B+ line to the video output circuit. If this resistor opens, there will be no B+ to the video output stage and the result will be a very bright screen w/ retrace lines and then the set will usually go into overcurrent shutdown. Also, look for a high voltage electrolytic cap in this same B+ line. It can also fail and lower the B+, causing a bright screen, a smeary picture, a picture that is darker on one side, etc.
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