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.
This is a common problem with these pioneer sets. It turns out to be the power supply board has some cold solder joints and needs to be resoldered. You can order a replacement board directly from the Pioneer web site or have you board resoldered. Check out the AVS forum for a detailed explanation.
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Please take out the main board, keep it immersed in mild liquid detergent solution for some hours, rub it thoroughly with a tooth brush, wash it with clean warm water, dry it thoroughly with hair drier and fit it back. Hope it works. It has done the trick for me several times.
Go to website Encompass Electronics.com type in your model number it will list part and part number ,you can also look for Lamp on E-Bay Encompass 1-800-638-3328 Also ck Color Wheel remove lamp take a flash light to watch when you turn TV on see if the color wheel is turning if it is defective set will shut OFF. But most likely its your Lamp.
This TV probably needs the convergence amp IC's replaced. When they go bad the TV will not turn on.Call a good TV Tech and tell him you want the IC's upgraded to STK 392-150 instead of the original STK 392-120 and check all resistors in the circuit for proper value. They could be burned or open.
i have had this problem on one of my tv s all i did was remove the back of the tv and re-solder all the joints around the tuner (thats where the arieal goes) they go with time because the joints there get so hot . hope this helps
Your problem is bad solder connections on the sweep or power supply board. In some rare cases I have seen the regulator IC with ring cracks arounfd the leads and causing the set to shut off all by itself. If you know how to solder and work on solid state printed circuit boards, you should not have too much problems finding bad connections or monitoring the B+ voltage to see if thats what is cutting off the set. If you have no circuit experience with TV's play it safe and call in a pro to assist you in this repair, as it should not cost too much to find this problem, if it is just bad or cold solder connections. Good Luck
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