What are these white vertical lines?

 

Anonymous
I have a Mitsubishi WS-65611. When the picture fades out (Like to a commercial) and the screen goes dark I have about 4 thin white lines running vertical on the screen.
Anyone know what they are or if I should be concerned?
 

If it happens on every source then it is either in the screen or it could be noise comming through the A/C. If not on every source then it could be the source.
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