The set will come on, then picture will start pulling in on the right side, then shut down in about 20 minutes. I had a similar problem with it about a year ago and found a service letter saying to replace the 2455 capacitor. I did this and unit has worked fine until now. I thought my solder joint may have come loose, so I resoldered it but no luck. I am a very experienced mechanic but a novice on televisions. Any help would be appreciated.
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your lamp is going out, they last around 2 years, on the average, this is easily replaced by you, door is on the right side of the tv, you can take the lamp out, if it has a bubble on it, it is getting ready to go out
You either have a bad fan or one of the rotation sensors mounted on one of the fans has failed. Take the back off the set and see it the main fan slightly right of center is rotating. If it is, there are two more fans, one mounted right above the lamp and another on the optical block itself. You will have to pull the optical block to check those.
The set most probably has cracked solder joints in one of the deflection circuits, which is pretty common. The picture tube and major components are fine. A good tech can quickly resolder the main board and that should not cost too much. If your set came into my shop I would charge about $50 but ask around, the shops in your area will vary.