My lg tv is showing pink spots on screen - LG 50PG6000 50 in. HD-Ready Plasma TV

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Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
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? 6:27
https://www.youtube.com/watch?v=EbGiXqBAvvo
Aug 25, 2010 - Uploaded by FixItUrselfDummy
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If other inputs show no problems and you are not using a cable box or satellite receiver, etc. just off air antenna, something on the main board is failing. please double check other inputs again.

The set if projection which model here is, has arced and now each of the three picture tubes used has a tiny permanent burn mark on its screen.

That is what you are seeing, the set uses three picture tubes with screens like the old tv sets===the coating has been burnt in each, want to prove it, remove rear cover and cover any one of the three lens and that mark on one tube will go a way.

Not fixable.

you most likely have a light engine problem ocouring causing the pink spots
they usualy have to be replaced with a remanufactured light engine you might see if you got a extended warranty on the unit as this can be a tad expensive

For the spots....

I had the same problem, first a blue spot then a green spot showed up. I contacted Panasonic Customer Support. They sent someone out and they fixed the TV for free. They reprogrammed the EEPROM chip in the TV. It is a defect. My TV was 4 years old and out of warranty. They came out last week.

So long as it is not happening by something you have done. It will be fixed free of charge. Call them, it solves the problem.

Green is missing from the area where you see the pink (actually magenta) spot. This might be due to a large amount of dirt on the green lens. It may be due to damage to the face of the green picture tube. You need to remove the front screen so you can look into the lens and determine that.

Depending on the make and model of TV, the screen may be held on by snap fasteners and come loose when you pull on the plastic bezel surrounding it. Or the bezel may pull off to reveal brackets screwed into the cabinet that secure the screen. Or there may be a trim strip under the screen that pulls off to reveal screws. Remove those and the screen will swing up and off.

Once you can see the lenses, clean them with a soft rag and glass cleaner. With the set on, look down into the lens and you can see the face of the picture tube. If you see a dark spot on the face, the tube is damaged and would need to be replaced

This TV has a known problem with the optical Block. Please call Sony Customer Relation and ***** them until they send someone to replace the optical block

Tiny particles of dust on the light engine lens can cause this (and was a service call for me about a month ago), or possibly the expensive light engine.

LCD pixtel failure. No repair, only replace