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In Reply to: Re: Sony 36HS510 HDTV Wega...transient noise on power up...is it normal? posted by GTF on February 24, 2004 at 13:30:00:
When you first turn on the tv, that noise is the tv "degaussing" or getting rid of the static on the CRT. It's completely normal. You can get an explanation by going to the sony site here: www.iq.sony.com
Follow Ups:
Thanks for the info folks. Very helpful and puts my mind at ease.
The degaussing is actually a magnetic event rather than one having to do with static electricity. The metalic shadow mask (located just behind the face of the crt) is suseptible to magnetic fields. Any magnetism on the mask (perhaps caused by a vacuum cleaner, childs toy, moving the set in reference to magnetic north, etc.) can cause color inperfections. The fix to correct this is to demagnetize the mask each time the set is turned on.A circuit allows a large inrush of ac power to a coil (resulting in the "boing" sound) located in proximity to the face plate. The current is then allowed to taper to zero. The action of this diminishing alternating field is to randomly orient the magnetic domains, thus destroying any static magentism. The actual sound is a function of the type of picture tube, its size, the construction of the degausing coils, etc. Every set has this feature -- some you can hear and some you can't.
Robert
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