Cable box causing magnetic interference?

Aug 10, 2014
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Hi everybody, my name is Kaydon. I'd like to start off with some backstory to the problem and then ask a few simple questions afterwards.

Recently Comcast has installed their new X1 boxes in my family's home and set them directly on top of both televisions. Since the installation, both of our old tube TVs that they've been installed to (we don't own any other TVs) have started making a low pitch humming noise. At first I thought it could have been that the TVs are just getting old and starting to wear out. That is until recently when my HP S2031 LCD monitor also started acting strangely, such as getting minor static undertones to normal usage.

My monitor sits within 3 feet of our television and cable box but I hadn't had any problems with interference since I switched from an old tube monitor to this LCD monitor. Since then, the problems on the TVs have been getting worse, scan lines appearing more frequently to the point where they're constantly there and the worst of it being true magnetic distortion towards the top of the television where the boxes sit, slight discoloration, screen warping to form a small ring around where the boxes sit, the top of the screen to become 'wavy' and even slight actual static running up the screen similar to the scan lines.

We noticed it while watching Netflix from my playstation and decided to try turning the boxes (which are always on unless unplugged) off and removing it from the top of the television. The distortion around the top of the TV has, for the most part, stopped but the scan lines and buzzing remain. Moving the box towards the TV while turned on seems to cause the distortion and 'wavyness' to start back up. It's hard to tell whether this is caused by the box, the actual cables plugged into the box, or just very convenient timing for the problems to act back up.

So my questions are these:
Is this even possible, if so could the monitor be related and what are some possible solutions since permanent damage has already been done?
If not, what else could be causing this?
 
Solution
It sounds like you have made the correct diagnosis of the problem -- old cathode ray tube (CRT) televisions actually "paint" the picture on the inside of the front glass tube with electrons as opposed to the way LCDs work, so CRT televisions would be far more sensitive to unshielded electronics that allow their associated magnetic fields to escape and interfere with other devices.

The CRT TVs should not be permanently damaged, you just need to increase the distance from the cable box to the TV until it is sufficient to stop the effect.

RealBeast

Titan
Moderator
It sounds like you have made the correct diagnosis of the problem -- old cathode ray tube (CRT) televisions actually "paint" the picture on the inside of the front glass tube with electrons as opposed to the way LCDs work, so CRT televisions would be far more sensitive to unshielded electronics that allow their associated magnetic fields to escape and interfere with other devices.

The CRT TVs should not be permanently damaged, you just need to increase the distance from the cable box to the TV until it is sufficient to stop the effect.
 
Solution