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Likely reflections off objects in the chamber behind the screen. If you didn't have them before, your installer may have mis-seated or bumped something or scratched off some black paint. If possible, with a cold bulb, check for fingerprints--will require partial disassembly and writing down where everything came from and a near-clean room. Wipe the "glass" with a microfiber cloth when done. Some line the inside with black absorbent cloth to prevent reflections--must not fall into the optical path. (Duvotune [sp?] comes to mind.) Check with AVSforum for your model to see what others are doing. Time again for me to check on my DLP model, which has a blue blur when there is a bright white light in certain areas due to reflection off ring around optics, just didn't seem worth fixing as it only shows up in 1 scene in "300" for a few seconds.
The problem is the computer in the TV is set to hold data for 2500 "On/Offs" Once you turn the TV on and off 2500 times, the dots start to appear as the computer cannot store anymore date. Call Panasonic, they will send a tech to your house for free and reset the computer and update it at the same time from 2500 to 1 million on/offs so it wont happen again. It takes maybe 10 mins to complete.
ITS PROBABLY THE RED PICTURE TUB (CRT). IT LOOKS EASY TO INSTALL, BUT YOU NEED TO MAKE ADJUSTMENTS TO THE SCREEN ONCE IT IS INSTALLED. THE PART IS $3OO. TRY TO FIND SOMEONE TO INSTALL IT FOR $150 OR LESS. HERE IS A WEBSITE TO HELP YOU MAKE ADJUSTMENT IN THE FUTURE ON YOU OWN. PRIDAH
The dark side of the screen causes of the lamp alignment or prism glass alignment. This is critical you have to consult your LG technician to do this. But if you have any background o repair consult the service manual. Please careful not to touch the prism quarts so that you maintained the clarity of picture and brightness on the screen.
they gona get worse to dead circuit, a small capacitor (problably in the neck board) is bothering you, get a tech now that he can see the problem, gonna be cheaper now....good luck
ps some times the picture say to the tech was going on