I have been dealing with the same problem with the identical set. I'm pretty handy so rather than junk the set, I took off the rear panel and stuck a small fan in the back to cool down the inside of the cabinet. I love the picture on this TV so I'm doing all I can to save it. Sometimes it doesn't turn on so I have now taken off the front panel (speaker cover) and also the front access panel. I carefully reach inside and have to wrap on the part (with a long wooden spoon) that I hear clicking from when I hit the power button. I used to just give the cabinet a swift kick and it usually would turn on, sometimes after several kicks. Kick it, then hit the power button. So whatever the problem(s), it's not keeping me from watching a gerat picture. I have a feeling that if I took my air compressor and blew out all of the dust from all over the components, it'd probably solve the problem of it shutting itself off after an hour or so. Why it doesn't always turn on is anyone's guess, but a good tap or two with my wooden spoon here and there and it turns on eventually. If you've already got rid of the set, I understand. I almost did the same.
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Something easy for you to check. With the set unplugged remove the back cover. On the circuit board where the power cord goes there are at least 7 pico fuses.
They are small and look like resistors and are usually either green or orange in color. They will have the amperage marked on them and on the top of the circuit board where they are soldered in.
What you are looking for are one or two that will most likely be 5 amp fuses--these usually go to the Convergence circuit of this set--if you find either one bad--they check just like any fuse--you need to replace both Convergence chips and the fuse or fuses that are bad.
Let me know what you find and I will assist you--this is the most common problem in these sets--
If this has helped you rate this solution as I do this here for free.
Can you unplug the TV for about 15 seconds, and then plug back in and watch the stand-by light. Tell me how many time the stand-by light blinks in regular intervals. If it doesn't blink at all, you need to change a fuse on the g-board. Once this is done run back through the stand-by blink light process, and more troubleshooting can be done if problem isn't already solved. If the stand-by light just keeps blinking with a count over ten just tell me, and I'll look for other possibilities.
Pioneer Elite Pro rear projection 620HD - Picture is still there but brightness and "white" have faded over years allowing for mediocre viewing when room is dark only. During the daylight picture is visible if viewed straight on and within 15 feet from set. Any suggestions?