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First try setting your contrast and brightness. It's a balancing act so you'll work with, but put more on the contrast. Also if you have access to a user friendly picture adjustment work with it. That increases the amplitude going to your color guns and your color temperature. If these are not on the set itself take you remote and hit menu and brouse the menu for control of these functions. Hue is an important function, it mixes red and green to get facial tones true. I hate to tell you this part, that's why I saved it for last. What you described it a good sign of the screen wearing out. It's the same thing that happens ocassionally in TVs with CRT Tubes.
Hope the adjustments fix it,
I have the same exact tv and the same exact set of problems, I was watching a movie through my xbox 360 connected by a hdmi cable. All of the sudden (noone walked by it, noone touched it, did not change the channels, didn't hit the remote) the colors just kind of "reversed". very very strange, don't know whats going on with it. And of course we can't find our reciept either, we even bought the extended service plan. A lot of help that did if we can't find it.
LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:
Symptom: No picture on screen but LCD TV still has sound. Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound. Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright Solutions: The problem is cause by defective LCD Panel.It needs to be replace.