Greetings and thank you for posting at JustAnswer! I will be glad to help you with your question. Please keep in mind that there are dangerous voltages inside a TV and some components hold a charge even when the TV is unplugged.
The first thing I would recommend would be to disassemble the set and see if Q405 is shorted using a multimeter and testing between the 3 legs of the transistor. You should get nearly a short between the base and emitter, but not the collector. If it is shorted, then you can feel pretty confident that replacing the Transistor and Flyback will fix the problem. Otherwise, if the transistor is not shorted, I would suspect one of the folowing common problems:
R539, R529 and R519
Anyway, here are the part numbers you're looking for:
Horizontal Output Transistor location # XXXXX part # XXXXX
Flyback Transformer location # XXXXX part # XXXXX
Based on my research the transistor subs to a 274762 which can be purchased here:
The Flyback can be purchased here:
Let me know if you have any more questions. Otherwise, if you have found this information valuable, please click Accept! Bonuses and Feedback are also appreciated!