Re: [Thinkpad] A21p backlight won't stay on

I suspect that your backlight is OK, but the power supply for it
(DC to DC convertor?) is damaged. It starts producing the right
voltage, then ramps down again. I'd watch the voltage and see
if it doesn't start out around 180V or so, then drop way down.
A thought, anyway.

--STeve Andre'

On Tuesday 24 August 2004 04:39, Michael Geary wrote:
> My A21p has developed a problem with its backlight, naturally a couple of
> months after it went out of warranty.
>
> The machine powers on normally, and the display looks fine with a good
> bright backlight, but after 10-15 seconds or so, the backlight goes off.
> This happens either running an OS or simply at the power-on screen, so it's
> not a software problem. I tried taking out the main battery and unplugging
> the CMOS battery for a while, but that didn't help.
>
> If I boot into Windows, and after the backlight goes off I use Fn+F3 ("turn
> off monitor") and then hit the Fn key again after a few seconds, the
> backlight comes back on for another ten seconds or so and then goes off
> again.
>
> There's no reddish tint or any other symptoms. The backlight looks fine
> when it's on. It just won't stay on.
>
> Anyone have an idea of what component might be at fault here? I've got a
> spare A21p system board, but I don't want to replace it if the problem is
> likely to be something else.
>
> Thanks!
>
> -Mike
>
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Received on Tue Aug 24 00:51:05 2004