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Diagonal green lines on a green screen

Hi,

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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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.

Jerry G.

Posted on Apr 25, 2008

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