Hi I have a samsung plasma PN50C550G1F I havve right now 2 vertical lines that seem to change color with the background picture. Tv powers up fine sound work perfect.

The symptoms you are describing with your Samsung plasma TV are consistent with a failure of the plasma display panel or a failure of the plasma drivers that control the display Here are a few things you can try to troubleshoot the issue:

1. Check the connections: Make sure all the cables and connections to the TV are secure and not damaged. Loose or damaged cables can cause visual distortions on the screen.
2. Perform a factory reset: Sometimes a factory reset can fix issues with the TV. Refer to the TV manual for instructions on how to perform a factory reset.
3. Check the internal components: If you have experience working with electronics, you can try opening the TV and checking for any obvious damage or loose components. However, be aware that opening a TV can be dangerous and may void the warranty.

Sounds like signal radiation from these devices which comes down to proximity or poor cables (screening) to me this is like the old days with video's under TV's causing lines and I would put a metal tray between them (or a silver one in some places).
If its proximity then move a metal tray or similar around during this event to see if you can find a spot when it clears or reposition an item. If its leads then close your hand around a cable this should make those lines vary if so obtain better types or move them around to better positions (called dressing cables).

Hope this helps..........

HI,
check the videos
Samsung plasma tv S50hw yb05 vertical colored lines diagnose fix su board... Plasma TV repair attempt Vertical colored lines lots of tobacco

http://electro-medical.blogspot.com/

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to both Plasma display & LCD screen are given with illustrations. You can get an idea about the fault to an extent.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
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.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts

It is called "Thin vertical lines" and change colors depending on the background color.
It is fixable but there are several components that can show this sympton.

You will need a tech to fix it in order to save money (because you do not want to buy a board you dont know if will fix it).
Possible Solutions:
Replace Timer Control Board, if it is not fixed
Replace Sustain Board.

One of those boards needs to be replaced and I wrote the most likely first.

The screen does not work properly .Ribbon wire fails.

if the tv is less than a year old , call 1-800-SAMSUNG for warranty repair, the lcd panel is bad

i think this is the called picture in jail. this might be due to 1 power supply reg.poor or filter cap dry. 2 loose or dry joint nera hor. output section or capacitor in eht section.

Definately a video processing problem and it may need a logic board it is called. Does the set work fine if you feed component into set to bypass all that? Let me know. GURU JAY