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Hello, If you're saying the color is alright when you connect to DVD player or Roku- then your TV is not likely the issue, but rather the cabling/connections from whatever it is you're watching with the poor color.
That being said WHAT is it you're viewing from where the color is bad (Cable/SAT box, etc.)?
Also, was this working fine before and then the color went bad....or when did this issue occur?
Let me know when you're able to see my reply.