Plasma TV Causing Cable Modem Dropouts
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Posted by manowak on August 30, 2006, 4:46 pm
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Bizarre problem here that started two days ago. I turn the plasma TV on, and the cable modem drops out (the greenlight for power and receive stay on, the green lights for send and connection drop out). I turn the TV off, 30 seconds later, the signal comes back. This is amazingly repeatable. It's a Motorola SB5200 (I think that's the number) cable modem. I have tried moving the plug in point for the Cable modem to a different circuit, thinking that maybe I was getting a power fluctuation. Nope, still happens. The one thing that seems to affect the behavior is the distance between the TV and the modem. > 3 ft, it keeps working, < 3 ft, turning the TV on always takes out the modem. The cable coming out of the wall is split behind the TV, with the TV cable going through a signal booster (a few years ago we were having problems). With 20-20 hindsight, I think my 5 year old cable modem had the same problem two months ago, but I replaced it thinking that it was just its time. This new one has been working fine for 2 months, and suddenly started doing this. We've got Comcast coming out on Saturday morning, but somehow I think they are going to just try and blame it on the modem, and nothing will get solved in the end. I'll take any suggestions. | |||||||||||||||||||||||||||||||
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Posted by Eric Furness on August 31, 2006, 11:13 am
Please log in for more thread options  enough RFI to interfere with the modem rf circuits, as the modem is probably not shielded internally. That would explain the greater than 3 ft distance clearing the problem. Eric | |||||||||||||||||||||||||||||||
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Posted by Ed Nielsen on September 1, 2006, 12:57 am
Please log in for more thread options I'm gonna have to go with the RFI thing as well. Cable modems and wireless routers should be at least 18" apart, I don't see why the same would not apply to any R.F. producing device. CIAO! Ed N. Eric Furness wrote: | |||||||||||||||||||||||||||||||
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Posted by Warren on August 31, 2006, 12:28 pm
Please log in for more thread options manowak wrote: Why would they blame the modem? If you've accurately outlined all the relevant details, the problem isn't the modem. The problem is the plasma TV. And there is a solution. More than one solution. More than one *simple* solution. And you already know what they are. One that doesn't need a technician to implement. Move the modem away from the plasma TV. An alternative would be to get rid of the plasma. Installing some ugly shielding between the two is a third solution. So "nothing will get solved in the end" isn't going to happen unless you're not willing to implement any of the solutions. I'm a little curious why you haven't already moved the modem. Surely your desk and computer aren't right on top of a large screen TV. And there must be someplace better to place the modem if your living area is large enough to have a plasma TV in it. Seems like a waste of a Saturday, waiting around for the cable guy when you could solve the problem right now without him. -- Warren H. ========== Disclaimer: My views reflect those of myself, and not my employer, my friends, nor (as she often tells me) my wife. Any resemblance to the views of anybody living or dead is coincidental. No animals were hurt in the writing of this response -- unless you count my dog who desperately wants to go outside now. Power Lawncare Tools for Spring Clean-up: http://www.holzemville.com/mall/blackanddecker/ | |||||||||||||||||||||||||||||||
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Posted by Dave on August 31, 2006, 2:19 pm
Please log in for more thread options It looks like Warren's bedside manner hasn't gotten any better. | |||||||||||||||||||||||||||||||
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>the cable modem drops out (the greenlight for power and receive stay on, the
>green lights for send and connection drop out). I turn the TV off, 30
>seconds later, the signal comes back. This is amazingly repeatable. It's a
>Motorola SB5200 (I think that's the number) cable modem. I have tried moving
>the plug in point for the Cable modem to a different circuit, thinking that
>maybe I was getting a power fluctuation. Nope, still happens. The one thing
>that seems to affect the behavior is the distance between the TV and the
>modem. > 3 ft, it keeps working, < 3 ft, turning the TV on always takes out
>the modem. The cable coming out of the wall is split behind the TV, with
>the TV cable going through a signal booster (a few years ago we were having
>problems). With 20-20 hindsight, I think my 5 year old cable modem had the
>same problem two months ago, but I replaced it thinking that it was just its
>time. This new one has been working fine for 2 months, and suddenly started
>doing this. We've got Comcast coming out on Saturday morning, but somehow I
>think they are going to just try and blame it on the modem, and nothing will
>get solved in the end. I'll take any suggestions.