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Posted by Quaoar on January 5, 2005, 10:14 am
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Brent Beach wrote:
> Hi
>
> I have a Toshiba Satellite that is generating a blank display about
> half the time.
>
> On boot up or very shortly after that the screen goes almost black -
> I can still see very faintly the brightest parts of the screen. On
> the last power up it showed the Toshiba banner and the first Windows
> banner, then went dark.
> Nothing seems to bring it back. Usually I just turn it off and then
> try again a few hours later. Most of the time it works, some of the
> time it is almost black. Other than turning it off I do nothing else
> that could affect the display.
>
> This happens when it is plugged in to AC, as well as on battery. The
> battery appears fully charged.
>
> I have spent some time with google and not found anything like this.
> The laptop is about 2 years old. When it works it works just fine -
> bright display, no problems. It may or may not work the next time.
> Weird.
> Brent
This certainly sounds like a failure in the inverter or a loose
connection in the power circuit connected to the inverter. I do not
believe that it is a problem with the lamp - these can become dim and
off-color, but usually fail outright - not intermittent failures.
You could open the case and check the physical power cable connection to
the mainboard and the power cable as it enters the LCD frame for a break
as a start, but to check the inverter and its connections requires
(usually) the LCD bezel (frame) to be removed. The inverter is
typically located in the space between the hinges at the bottom of the
screen. I've seen inverters on which the high voltage end connected to
the lamp is burned which fails the lamp power supply at that point.
Q
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