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Next: PC won't boot up - getting POST beeps
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 1) Posted: Mon Sep 11, 2006 8:13 am
Post subject: Laptop backlight quitting intermittently
Archived from groups: alt>comp>hardware, others (more info?)
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Averatec laptop backlight turns off after random lengths of time. Can still
see the dim images on the screen that behave normally to mouse inputs, so the
LCD is still alive.
I presume that the high-voltage PCB that runs the bulb is going bad. Is there
any chance that this is a virus or software bug that is causing the backlight
to turn off?
I Googled for this but nothing definitive came up.
Thanks,
--
DaveC
me.RemoveThis@bogusdomain.net
This is an invalid return address
Please reply in the news group |
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External
Since: Nov 17, 2005
Posts: 5
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(Msg. 2) Posted: Mon Sep 11, 2006 8:43 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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DaveC wrote:
> I presume that the high-voltage PCB that runs the bulb is going bad. Is there
> any chance that this is a virus or software bug that is causing the backlight
> to turn off?
Not really. But it need not be the inverter at fault, it could easily
be a cabling issue. What model Averatec is this? |
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 3) Posted: Mon Sep 11, 2006 11:35 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 4) Posted: Mon Sep 11, 2006 3:31 pm
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thus spake zwsdotcom DeleteThis @gmail.com:
> Not really. But it need not be the inverter at fault, it could easily
> be a cabling issue. What model Averatec is this?
Model: 3200
Tilting the screen hinges back and forth does not start or stop the
phenomenon.
Thanks,
--
DaveC
me DeleteThis @bogusdomain.net
This is an invalid return address
Please reply in the news group >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 5) Posted: Mon Sep 11, 2006 3:32 pm
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 6) Posted: Mon Sep 11, 2006 6:04 pm
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thus spake zwsdotcom.DeleteThis@gmail.com:
> Not really. But it need not be the inverter at fault, it could easily
> be a cabling issue. What model Averatec is this?
Is the inverter circuit on the motherboard or is it on a separate PCB?
Thanks,
--
DaveC
me.DeleteThis@bogusdomain.net
This is an invalid return address
Please reply in the news group >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Jan 31, 2006
Posts: 92
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(Msg. 7) Posted: Tue Sep 12, 2006 12:17 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: alt>comp>hardware (more info?)
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External
Since: Jan 03, 2004
Posts: 7693
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(Msg. 8) Posted: Tue Sep 12, 2006 12:17 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Tue, 12 Sep 2006 00:17:49 -0000, no DeleteThis @spam.invalid (Davy)
wrote:
>More likely the CCFL tubes themselves, they are like a flouresecent
>tube without the heater electrodes at the ends. A sign is the they
>either start to flicker and the 'whites' become tinted in the
>picture.
>
>But the dc-dc inverter that steps the 12V supply up to around 1,800V
>(1.8KV) could also be the cause but I'd go for the tubes first.
>
>Have a peep here -: How to replace the backlight
>http://www.dnd.utwente.nl/~grit/backlight/ccft.html Clicking the link
>will open it in a new window.
>
>Davy
Yes the CCFL tubes can fail, but they won't generally
exhibit the symptom the OP described if/when they do, to
work when turned on then fail outright, but then work again
later. >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Feb 13, 2006
Posts: 84
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(Msg. 9) Posted: Tue Sep 12, 2006 1:44 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: alt>comp>hardware, others (more info?)
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DaveC wrote:
> Averatec laptop backlight turns off after random lengths of time. Can still
> see the dim images on the screen that behave normally to mouse inputs, so the
> LCD is still alive.
>
> I presume that the high-voltage PCB that runs the bulb is going bad. Is there
> any chance that this is a virus or software bug that is causing the backlight
> to turn off?
>
> I Googled for this but nothing definitive came up.
>
> Thanks,
Loose connection / bad joint somewhere. Prodding about with an
insulated tool should narrow it down.
NT >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Sep 12, 2006
Posts: 2
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(Msg. 10) Posted: Tue Sep 12, 2006 2:08 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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I was having an issue with a new LCD and inverter. The backlight still
wasnt functioning. Then someone told me about the "toggle switch" that
turns the backlight on or off when the lid is opened and closed. Supposed to
be near the keyboard. Maybe it has a short or isn't functioning.
=======================================
"DaveC" <me.DeleteThis@privacy.net> wrote in message
news:0001HW.C12B5595001CBA01F04075B0@news.readfreenews.net...
> Thus spake zwsdotcom.DeleteThis@gmail.com:
>
>> Not really. But it need not be the inverter at fault, it could easily
>> be a cabling issue. What model Averatec is this?
>
> Is the inverter circuit on the motherboard or is it on a separate PCB?
>
> Thanks,
> --
> DaveC
> me.DeleteThis@bogusdomain.net
> This is an invalid return address
> Please reply in the news group
> >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Nov 17, 2005
Posts: 5
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(Msg. 11) Posted: Tue Sep 12, 2006 5:03 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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DaveC wrote:
> > Not really. But it need not be the inverter at fault, it could easily
> > be a cabling issue. What model Averatec is this?
>
> Is the inverter circuit on the motherboard or is it on a separate PCB?
The inverter is always on a separate PCB in the upper half of the
laptop, because the HV wires need to be as short as possible (they
radiate EM noise, and they're also lossy).
Apart from the backlight switch issue mentioned by another poster, you
might have a heat issue on the inverter. I'd open up the screen half of
the laptop and let it run until it fails, then _carefully_ squirt
freeze spray on the inverter to locate the bad component. >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Jan 19, 2004
Posts: 10
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(Msg. 12) Posted: Tue Sep 12, 2006 7:57 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thus spake shockwa:
> I was having an issue with a new LCD and inverter. The backlight still
> wasnt functioning. Then someone told me about the "toggle switch" that
> turns the backlight on or off when the lid is opened and closed. Supposed to
> be near the keyboard. Maybe it has a short or isn't functioning.
What model is your laptop?
Thanks,
--
DaveC
me RemoveThis @bogusdomain.net
This is an invalid return address
Please reply in the news group >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Sep 12, 2006
Posts: 2
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(Msg. 13) Posted: Tue Sep 12, 2006 9:18 pm
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"DaveC" <me.DeleteThis@privacy.net> wrote in message
news:0001HW.C12C18D100025EC6F02845B0@news.readfreenews.net...
> Thus spake shockwa:
>
>> I was having an issue with a new LCD and inverter. The backlight still
>> wasnt functioning. Then someone told me about the "toggle switch" that
>> turns the backlight on or off when the lid is opened and closed. Supposed
>> to
>> be near the keyboard. Maybe it has a short or isn't functioning.
>
> What model is your laptop?
>
> Thanks,
> --
> DaveC
> me.DeleteThis@bogusdomain.net
> This is an invalid return address
> Please reply in the news group
>=====================================
It's a Fujitsu Lifebook S6210. Now my problem is I can't seem to find the
lid close(pin)switch. I've looked everywhere near the hinges, keyboard,
inverter, etc. Well thats my luck. See if you can find it with this pic I
took. http://home.pacbell.net/shockwa/images/laptop.jpg >> Stay informed about: Laptop backlight quitting intermittently |
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External
Since: Sep 12, 2006
Posts: 3
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(Msg. 14) Posted: Tue Sep 12, 2006 9:18 pm
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Sep 13, 2006
Posts: 2
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(Msg. 15) Posted: Wed Sep 13, 2006 12:02 am
Post subject: Re: Laptop backlight quitting intermittently [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Ian Singer" <iansinger.DeleteThis@sympatico.ca> wrote in message
news:4mor7vF76m5tU1@individual.net...
> shockwa wrote:
>
>> It's a Fujitsu Lifebook S6210. Now my problem is I can't seem to find
>> the lid close(pin)switch. I've looked everywhere near the hinges,
>> keyboard, inverter, etc.
>
> What makes you think it has one? Some laptops are magnetically activated
> and there is no exposed switch.
> Ian Singer
=========================================>
ok well I guess I wasn't specific enough. Where is the lid close magnetic
thingie? or
could it somehow be stuck in the close position because of removing the LCD.
I was aware it could be a magnetic switch, but where is
it on this model or one similar?
>
> --
>
>
> =========================================================================
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> I am near Toronto Canada, can I tell where you are from your reply?
> ========================================================================= >> Stay informed about: Laptop backlight quitting intermittently |
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