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I have a panasonic DLP rear projection t.v. There are bright colored spots on the screen. the screen has ghostimages and vertical lines.

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Ghosting is usually caused by RF interference.

I would troubleshoot the video source rather than the projection TV.

The first thing to check with interference is the tightness of all connections. If your signal is transmitted via a coaxial cable, (which I'll assume because ghosting is common with coax) use a wrench to thread each connector tighter. Not too tight, of course, just a little more than what you could do with your fingers. Check the image.

If ghosting still apears, check the connectors themselves. At any point can you easily pull the cable out of a connector? Does the cable look like a good quality cable? If the cable itself is thinner than a standard pencil, the answer is no. A lot of manufacturers turn out crappy thin coax cables that cause many, many problems.

If you're pretty certain the interference is not attributed to bad wiring, consider the environment where you watch the TV. Are there devices within range that might cause RF interference? A CB radio? cordless phone? cordless microphone? microwave oven? wireless router? If so, these devices might be resonating with the video signal, causing the unwanted equivalent of a delay in an audio signal. Try unplugging these devices one at a time and observe what difference, if any, they make on your reception.

Report back if these tips are not fixing your problem.

--Matt

Posted on Nov 02, 2008

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