New 4k TV has color and pixel issues. - DirecTV

Set up a new Samsung 8 Series 4k TV to existing Uverse receiver. Resoution is pixelated, colors are off with green and magenta shadows, some shows have small image with wide black band around edge of screen. Have exhaustivly gone thru the TV settings without good results. A friend has suggested our uverse receivers are to old and we will never get good viewing from the 720/1080 receiver? Any suggestions?

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