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I presume that the problem started in the middle of the picture and has gradually got larger as time goes on.
It is most likely the blue organic polariser/filter glass plate that passes the blue light into the blue lcd panel.
If you were to take the cover off ( with the power disconnected) and check inside the optics area, you may see the filter burnt from long use on high brightness levels.
Either try and get a replacement polariser or buy a second hand PJ1173 cheaply on ebay and replace that part.
It seems the problem you refered is quite complicated if you are not qualified technican. It needs full servicing of main board, including all the heated areas on board.You will need a soldering iron, and a multimeter to test the components, such as resistors on CRT socket board. The yellowish colour is caused by dry joints, (a common fault causing components to shake from its soldered base by heat). Resolder the main board and test the resistors on the CRT socket board for defective ones, change it. If you think you are qualified for this, give it a try or else consult a technican. thanks
The noise reduction aspect of this camera can cause some of this--you may wish to reduce the noise reduction in the quality settings of the camera (see your manual for directions) further, if you are open to post-production fixes you may wish to use a program like Adobe Lightroom2 to correct some of this. Finally you may wish to shoot indoors using the RAW or RAW+JPEG setting. Doing so will give you more control over post-production color correction, and somewhat less artifacting from the noise reduction software.
daveT29 - I had my brightness cranked, too. The picture went dark and off-color after moving the TV from one corner of the living room to another.
After waiting for the TV repairman for about 4 weeks, I "fixed" it myself. Take the front panel off (4 screws, then a black panel) and blow out all the dust. I was afraid to use a swiffer duster because of the static electricity, so i just used with my mouth blowing powers.