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The screen's backlight is dying. Sooner or later this screen will be pinkish and later it will be darker and black. You need to replace the whole screen (it is not easy to replace the backlight).
If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
A few suggestions here--first if possible look into the lens of the tubes with set on--is one brighter than the two others? A loss of blue to some degree would mean yellow (red and green).
Also ( you may have to remove entire grill from front below screen) with set off make sure all 3 of the circuit boards that plug onto the bottom of the necks for each tube are not loose or one has not slid down a bit.
Im pretty sure its not the television. You are getting interference from either through your cable box or your electric in the house. Possible bad dimmer switch.
This sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following two links for more info:
bad convergence amp ic http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html Sony Convergence http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/ http://www.techlore.com/article/19631/Sony-Convergence-Procedure/
You have a bad connection on the CRT board thats mounted on the end of the picture tube it sounds like, or the socket on that board that plugs into the TV set is intermittant or has a bad solder connection on it. Good Luck
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