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I recently purchased a used 32" Hitachi tv for a spare room but have noticed that, probably due to the cabinet's flimsy construction, the tv's internal speakers (at the bottom of the tv) are creating small areas of magnetic interference (greenish-colored distortion) at the bottom corners of the tv screen. The problem is barely noticeable when watching DVDs (black bars at top and bottom hide the problem), but on regular tv it is annoying.I suspect that the problem could be solved by opening up the tv cabinet and placing a layer of foil or other shielding in between the internal speakers and the tv screen. I'm thinking of enlisting the help of a friend who has some technical proficiency reparing stereo equipment and unscrewing the back of the tv cabinet from the front part to open it up and try to shield the speakers. But since I've never opened up a tv cabinet before, I was wondering if this is a wise idea. How difficult is it to open up a large tube tv cabinet, and what's in store for me once I do? Would I literally be opening up a Pandora's box which would be better left for a tv repairperson to deal with? Or is it pretty straightforward once the front and back cabinets are unscrewed? Thanks in advance.
Follow Ups:
Mu metal (pronounced 'mew') shielding might do the job. It is often used around CRT's (like oscilloscopes) to prevent external magnetic fields from interferring with the display screen. Also used to house magnetically sensitive instruments. Avaialable in sheets, foil, or preformed enclosures. I used mu metal shielding around the internal components of a rubidium frequency standard (small atomic clock) used as the time base for aircraft navigation equipment. It needed to be shielded from the varying magnetic field around different parts of the globe.If your TV simply needs to be degaussed, most TV's have a built in degausser. Unplug it for several minutes then plug it back in and power it up. If that doesn't work, you can buy a stand-alone degausser (which is just a device that generates a strong AC field, usually a coil of wire). Wave it in front of your TV screen to "degauss" it. In the old days, TV repair shops would have a degausser in their toolkit and RadioShack used to sell them (maybe still do, I don't know).
Go to google.com and search on these topics:
- TV degausser
- mu metal
- magnetic shield
you can't shield the speakers with foil. The only way is to install "bucking" magnetics on the existing magnets in reverse to "cancel" the magnetic field. These obivously have to be glued on with some very high strength glue since they will try to fly off.The best way to tackle this probelm is to degauss the picture.
Depending on the age of the tv this may be automatic and will eventually disappear. On older sets there may be a degauss setting in the menu. Often this is named something else "Earth correction" or somesuch.
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