I had not used the TV for about a year. It was unplugged. When I turned it on it has a picture but it is quite faint and there are thin white horizontal lines about an inch apart on the screen from top to bottom
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If you can't see a faint picture with the flashlight then the T-con board is gone. If you can see a faint picture, then the led driver or ballasts for the back lights quit. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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If you are turning off your TV by basically unplugging it (turning off the AC power supply) then you will not hear the click of the solenoid which is activated normally by the Power button. The glow may well be the after effects of the screen being on for some period of time. Quite literally the "afterglow". This should be very faint and fade after some time.
Hi dcough2, haev you tried to unplug it for some minutes, and then connecting it back again? Anothwr thing to revise is if the socket is used for more than devices than the TV, it could also be weak power, so your TV image fait, or go dark, or it just shuts off because it have not enough power to use.
My best recommendation is to pull the back off it and blow the dust out. Dust is electrostatically attraced to the components inside and acts like a blanket. This causes overheating. Remember to leave your tv unplugged for at least an hour before taking the back off as the CRT (picture tube) will store a charge which can kill you.
This is a pretty common fault here Mike. I cannot remember the capacitor number, but it is right off of the flyback transformer and supplies the screen voltage to the picture tube driver transistors. You will need to get a scematic and trace out and check the flyback secondary capacitors for leakage, I am sure you will have more then on or two capacitors that need to be replaced. One more thing with this TV set. Look right under where the picture tubes are on the printed circuit boards, for an indication of fluid leakage or an oily substance. If you see any evidence of this, turn off the TV set and unplug it and call out a tech to try and clean off these boards before any further damage happens. Good Luck