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I recently bought a small home theatre stereo for the bedroom. However, when it is plugged in it causes interference on the TV. I know the stereo is the cause because this is the only time the interference happens. It's not because of the speakers because this happens even when they (the speakers) aren't anywhere near the TV, and it doesn't matter where the stereo is placed because it happens regardless of location or outlet. I need to keep in mind that the TV is old and has probably seen its last days. Could the TV itself be the problem, or is it something else? It's really weird.
What kind of interference? How is it manifested (I know on the TV, but what type, appearance, etc)? When the interference is happening, does it go away if you turn the stereo off? If you unplug the stereo?
Is the TV connected in any way to the stereo other than that both are plugged into an AC wall outlet? Have you tried inverting the plug at the wall (for the TV and/or the stereo)?
Picture interference.White diagonal lines going across the screen.No.Yes.No. I bought an RF modulator since the TV doesn't have the proper outlets, but I haven't even taken it out of the package yet.I can't because one of the prongs is larger than the other on both plugs. Also, the interference happens whether I plug the stereo into a power strip or directly into the wall socket.I don't know how much more I can mention other than answering your questions. Basically it's when I plug in the stereo even without turning it on, the interference happens. It doesn't happen when my VCR is plugged in, though. It's only with the stereo. This is the best that I can describe it.
I suppose that's possible - I don't know. You've discovered that all that is necessary for the interference to occur is that the stereo be plugged in - it doesn't even have to be turned on. That means that its standby circuitry (used to acknowledge commands from the remote control) is broadcasting by some unknown means - certainly against FCC rules. Have you tried reorienting the television antenna (is it a rabbit ears style antenna)? I can't think of much else that doesn't sound spacey (like wrapping the stereo in aluminum foil, or something).
I finally hooked up the stereo to the TV (including the RF modulator), and there's no interference when it's set for DVD. When I want to watch TV on that set, I have to remember to unplug the stereo.
That would indicate that Gay Saytr's last hypothesis was correct. The stereo is generating an RF signal that is interfering with the TV reception.
Depending on where you live, you might want to check to see how close to the TV the stereo has to be in order to cause the interference. If it is more than a few feet and you live in an apartment with neighbors nearby, it's possible that the stereo could cause interference on a neighbor's TV as well.