• Assuming you have a standard cathod-ray, scanning, picture tube; what's happened is that 2 of your 3 primary electron guns are either very weak or have died out altogether while your remaining red electron gun soldiers on. Your blue and green electron guns are the problem but since they are an intregal part of the picture tube, the entire tube must be replaced. You may find it less expensive to get a new TV than to try to fix your current one.

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