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From: abd08 on 6 May 2008 06:23
On 29 Apr, 10:03, "M.I.5¾" <no....(a)no.where.NO_SPAM.co.uk> wrote:
> "abd08" <dejao...(a)hotmail.com> wrote in message
>
> news:80b906ba-2ec5-435d-ab64-0f7c00ba8adf(a)a70g2000hsh.googlegroups.com...
>
>
>
> > Hi All,
>
> > Have a panasonic CF-W2 laptop, and the following has happened:
>
> > 1. From about 2 months ago, very randomly, the screen would
> > "glitch" (jump as if the VSYNC was off, NOT go off/out). This would
> > occur several times a day, or sometimes not at all. It would also
> > occur regardless of condition - just sitting on the desk, perfectly
> > stable, and then "glitch". Tilting the screen had no effect either in
> > making it glitch, making glitching worse, or stopping it glitching.
>
> > 2. This morning everything was as per 1. However, got home and started
> > using it: At first, everything was normal. Walk away for 20mins and
> > come back, and there is a pitch black patch (about 3cm by 2cm) in the
> > bottom left corner. Upon touching it, it was extremely hot. After
> > lowering the brightness on the LCD, for the first minute I got
> > continuous glitching (for the first time ever), then the glitching
> > slowed down/gone back to normal, and now the spot has gone away. The
> > screen is much cooler, but very dim now! =)
>
> 1. may be unconnected, but the black patch that was very hot is due to a
> problem with the Cold Cathode tube that illuminates the display (or can be
> the tube's associated inverter - but my money is on the tube itself). These
> tubes seem to be somewhat misnamed because the cathodes aren't cold at all,
> they actually get very hot in use (the term 'cold cathode' has a very
> different meaning). There is a failure mode of these tubes that causes the
> cathode at one end to get even hotter than it really ought to. This heats
> up the Liquid Crystal display immediately adjacent to it which ceases to
> work as it should and exhibits a black patch. The display often recovers as
> it cools down, but continued operation in this manner will result in its
> eventual destruction. Replacing tubes is not for the faint hearted.
>
> 1. just sounds like a loose connection.

Right... solved the problem. The problem was the backlight as you
correctly guessed. Cable was fine, inverter was fine (got a spare
now!). Got a replacement screen (refurb) with 1 month guarantee for
190USD (95 pounds) fitted etc.

Thanks to all for their help and insight... have another 2 laptops,
and won't be replacing them as hastily as I might have once done! =)

Raj
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