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From: Baron on 21 Oct 2009 15:46
Sylvia Else wrote:

> William Sommerwerck wrote:
>>> Could it be that all it needed was a couple more cycles
>>> of its own degaussing?
>>
>> Likely. It also might be that the shadow mask got warped, and
>> repeated handling knocked it back into shape.
>>
>>
>
> Just for the record, and for the benefit of anyone who comes across
> this in the archive, further online research revealed that part of the
> purpose of the degaussing process is to *magnetise* the shadow mask in
> such a way as to cancel out the Earth's magnetic field in the space
> between the mask and the screen. This is the reason the shadow mask is
> made of a magnetisable material (which otherwise would seem a strange
> design choice).
>
> So my experience can be adequately explained by the fact that I
> powered the TV up while it was in a completely different orientation
> from normal. It was then entirely possible that this would take
> several degaussing cycles to undo properly once I had the TV back in
> the normal position. The situation was further confused by my failure
> to realise that this model only degausses when powered up from the
> mains, and not when going from standby to on. It's necessary to power
> it down completely for a while before powering it up again for it to
> do its degaussing.
>
> So I guess that's that.
>
> Sylvia.

Its also why many have a manual degauss button or menu selection.

--
Best Regards:
Baron.
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