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Hi Chris.. this is a long shot but often works. If you take the back off your TV, you will see a small board attached to the end of the picture tube. This board is attached by pushing it onto a round connector made up of lots of pins in a circle. With the power off and the TV unplugged remove this board by pulling it off (Hmmm not worded well). Then clean all the pins with a little metho or even a pencil rubber.. Then push the board back on. You cant get in wrong as the connector has a key on it that only allows it to go on one way.. You will see if you do it. very simple..
Somtimes these pins can get dirty over time and this can cause the problem. Not always, but you have nothing to loose as the set is not working correctly anyway.. I hope I have been some help. I am new to this site and Astronomy, I am always asking for assistance. It's nice to now give some back..
PS. Don't go touching other parts of the inside of the Tv as High voltages can remain in the components for some time and give you a nasty shock. You could even leave the set off for a day or so to let residule power drain. If you only touch the area I mentioned you will be fine.
cheers
Mardy
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