I have a three year old Panasonic HDTV 1080i Recently the screen colors have turned into vertical color bands, starting from the left to right orange, green, blue, purple, blue, green, orange Is this thing toast?
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Try balancing the tubes out, turn your color all the way down and the brightness in the middle, then find the focus block, it will be a block with 6 controls one row will say screen the other will say focus near the picture tubes, adjust the screen controls(one control for each color) until the picture has a good black and white look to it, then turn your color up and it should look fine. This is how i balance out the picture. But there is another method that allot of techs use, the other method is to adjust the brightness up until you see what is called retrace lines it is a jagged line going down the screen, once you see these lines back the adjustment down just until they disappear. Do this for all three colors. This method works but on an older set can throw the white balance off because of tube wear.
That may be a TV problem but can also be a Cable box problem.Do you have any other 480i signals hooked to the TV?
Also most Comcast HD boxes can be set to output SD signals at 480p which may solve the problem. Usually get to the setting by turning the cable box off and pressing menu on the box, not remote.
It should display a different menu on the tv screen, arrow down to 4X3 overide then arrow right and try 480p.
It sounds like you may need to re-adjust your G-2 controls, located at front, remove front panels. Look for small block with screen /focus controls on item, first turn color down, reset brightness, contrast controls. Adjust until lines are at min. and picture is a good black and white (grays). Good Luck, big IRISH.