Join Date: Jun 1999
Location: San Jose, CA. USA
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This sounds like a ground loop problem between your source unit and the display- I presume you're powering from different outlets? If so, they may be on different circuits. As a test, try running an extension cord from the same outlet as either your set or source (DVD? Receiver?), so they're on the same AC.
When this occurs with cable, it's possible to get an HF isolation transformer for the RF. For video, such a simple solution won't work, as video is wideband. One solution I've seen work is to use a balanced power unit with isolation for all the source components. Note that the ground loop can be coupled through the audio gear into your video system, if there's a common ground in one of your components. A ground lifter AC plug won't always solve this, because it can be related to noise voltage on the neutral line; this is why a balanced power unit with filtering often helps (like the Smart Devices "Garbage Collector"). Good luck resolving your problem.
We can screw up the other planets later!