labeled Pb, Pr, and Y, to connect your TV and video source, make sure you have connected the blue Pb jack on the video source to the blue Pb jack on the TV, the red Pr jack on the source to the red Pr jack on the TV.

Screen Brightness

If you find that the colors on your Samsung TV are correct but just a little too dark or bright, try adjusting the following settings in the Picture option

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Samsung PN64E8000 manual Screen Brightness