My CRT TV (PAL) goes completely green with green diagonal lines (like a diagonal continuous scribble) as soon as I switch it on. After about 10 minutes I switch it off and on again. At this point the lines go and the picture is clear. It happens every time but is now beoming more difficult to get working as more often than not the screen goes back to green. The funny thing is that once the screen becomes normal it stays like that until it is switched off again. What can I do to resolve this problem? I opened my TV (A Daewoo 28") and found the tube to be made by Philips.
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Re: Diagonal green lines on a green screen
It is possible that the electron-gun inside of the CRT is having an intermittant short. It is also possible that there is an intermitttant failure in the bias or drive circuits for the CRT electron-gun.
The TV service tech would have to run some tests to determine the actual fault, and then the failed components.
If the CRT is at fault, the set will not be worth to service.
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yes. if you have a black bright screen with about 16 to 20 horizontal lines going across, you have no video. suggest local service center. if it is a magnavox, this is easy. you have an open 1 ohm(approx. value) resistor on the crt board.
Is that diagonal thin line about 10 to 20 degree slant? And then you have a very bright raster?
Then you set the flyback(for tube tv), I think its "screen" voltage is set too high adjust it slowly to lessen the brightness. It is commonly a small pot on the side of the flyback together with the focus pot.
If you have raster turn the tv on, use insulated screw diver, then slowly turn the knob to the direction(CC or CCW) where your raster go dim.
Be careful your dealing with live and high voltage. If your not inclined on electronics better not to.