Recently I have noticed a blue shade on the upper left corner of my plasma screen; it always appears when a certain degree of white color displayed on the screen.
My plasma is 2 months old. I have tried all white and signal pattern options but nothing happened.
When I resize the screen to be 4:3, the displayed image shrink and the image become perfect cause its far away from the edge.
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You might have a Service Co. come out and look at it. It sounds like the Z module is not doing it's job of erasing all prior images after a scene change. Some models there are adjustments for that internally. ( only for a tech ) Start a paper trail now.
This set has no internal manual adjustments for color. The Tracking or B&W balance is accessed via the service menu. I don't suggest you attempt to adjust without instrumentation. the trouble with your set is not an adjustment. Most likely the Optics are at fault. This model has had issues with filters in the optics being destroyed over time by the lamp. The blue haze will get worse and continue to grow over the whole picture. The only option is to remove the Optics (light engine) and sent it out to be rebuilt.
There may be a failure starting on the video or matrix driver boards. This has to be verified at the service center. The fix will be done by swapping in a new board to replace the failing one(s), and re-doing the factory setups to make sure that the default colour temperature and levels are correct.
I suggest that if the set is out of warranty ask for an estimate first.
Try to replace the Logic Scan board on the upper left side of your tv. The part no. is printed on the board and you can order it from Panasonic's Website. Also check the Service Manual for the part description and part no.
some of these panels were mis-calibrated from the factory after not aging long enough. Let the TV run for atleast 2 hours and adjust the Vs and Vscan voltages. When it is blue in the left I have found generally the Vs is about 10 volts too high.