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Toshiba backlight switch

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john   02-21-2005 at 10:36:49 AM

Archived from groups: comp.sys.laptops (More info?)

 

The display on my Toshiba A15-S127 flickered for a few minutes and then went
blank. I accidentally found later that there is a faint image there and I
can switch it to a crt monitor. The backlight is probably toast but I
wanted to verify that the mechanical switch that shuts the backlight off
when you press the screen down isn't "acting up". Does anyone know where
the switch is located on the chassis?

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Anonymous   02-21-2005 at 01:53:52 PM
- 0 +

Archived from groups: comp.sys.laptops (More info?)

 

John wrote:
> The display on my Toshiba A15-S127 flickered for a few minutes and
> then went blank. I accidentally found later that there is a faint
> image there and I can switch it to a crt monitor. The backlight is
> probably toast but I wanted to verify that the mechanical switch that
> shuts the backlight off when you press the screen down isn't "acting
> up". Does anyone know where the switch is located on the chassis?

The switch, if not readily visible, might be embedded in the left hinge.
If you have difficulty finding either the backlight (cold cathode
fluorescent light) or the inverter, try this site:
http://www.lcdpart.com/index.html

Q

Reply to Anonymous
john   02-22-2005 at 01:21:38 AM
- 0 +

Archived from groups: comp.sys.laptops (More info?)

 

"Quaoar" <quaoar@tenthplanet.net> wrote in message
news:RsSdnb8r5o-da4TfRVn-pg@comcast.com...
> John wrote:
> > The display on my Toshiba A15-S127 flickered for a few minutes and
> > then went blank. I accidentally found later that there is a faint
> > image there and I can switch it to a crt monitor. The backlight is
> > probably toast but I wanted to verify that the mechanical switch that
> > shuts the backlight off when you press the screen down isn't "acting
> > up". Does anyone know where the switch is located on the chassis?
>
> The switch, if not readily visible, might be embedded in the left hinge.
> If you have difficulty finding either the backlight (cold cathode
> fluorescent light) or the inverter, try this site:
> http://www.lcdpart.com/index.html
>
> Q
>
Thanks for the response Q.
By embedded you mean I have to take the bezel off first? It's definitely
not visible from the outside.
What are the odds of it being a bad switch rather than a fried backlight?
Thanks again, John.

Reply to john
Anonymous   02-22-2005 at 04:26:35 AM
- 0 +

Archived from groups: comp.sys.laptops (More info?)

 

On Mon, 21 Feb 2005 04:36:49 GMT, "John" <jmspital@neo.rr.com> wrote:

:>The display on my Toshiba A15-S127 flickered for a few minutes and then went
:>blank. I accidentally found later that there is a faint image there and I
:>can switch it to a crt monitor. The backlight is probably toast but I
:>wanted to verify that the mechanical switch that shuts the backlight off
:>when you press the screen down isn't "acting up". Does anyone know where
:>the switch is located on the chassis?
:>

On that model there is a magnet on the backside of the lcd mask that
activates a magnetically activated microswitch on the system board. My 5205
and a lot of other newer models are going that way since there's no "moving
parts" to break or wear out.

BTW, a dim display as you mentioned most likely is either be the fl inverter
(a pcb that provides high voltage to the fl tube) or the fl tube itself.

Good luck,
me/2

Reply to Anonymous
Anonymous   02-22-2005 at 02:16:39 AM
- 0 +

Archived from groups: comp.sys.laptops (More info?)

 

John wrote:
> "Quaoar" <quaoar@tenthplanet.net> wrote in message
> news:RsSdnb8r5o-da4TfRVn-pg@comcast.com...
>> John wrote:
>>> The display on my Toshiba A15-S127 flickered for a few minutes and
>>> then went blank. I accidentally found later that there is a faint
>>> image there and I can switch it to a crt monitor. The backlight is
>>> probably toast but I wanted to verify that the mechanical switch
>>> that shuts the backlight off when you press the screen down isn't
>>> "acting up". Does anyone know where the switch is located on the
>>> chassis?
>>
>> The switch, if not readily visible, might be embedded in the left
>> hinge. If you have difficulty finding either the backlight (cold
>> cathode fluorescent light) or the inverter, try this site:
>> http://www.lcdpart.com/index.html
>>
>> Q
>>
> Thanks for the response Q.
> By embedded you mean I have to take the bezel off first? It's
> definitely not visible from the outside.
> What are the odds of it being a bad switch rather than a fried
> backlight? Thanks again, John.

Not much chance it's the switch, IMO. See me/2 below on the magnetic
switch that you might be able to test with another small magnet.

Q

Reply to Anonymous
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