Hi

I think my backlight has gone/is going on my laptop. The screen is pink
on boot up and then fades to black very quickly.

I have changed the inverter but it made no difference
checked it works ok with external moniter
checked the hibernate button isn't stuck
checked connections

So I think it must be the back light itself, I don't quite know where
it is though, looked into the screen and there is a taped wire? going
across the screen but nothing that looks like a tube..

So

Can anyone tell me how i get to it on my laptop?
Is it something I can replace myself or do I need a complete lcd screen
- really hoping not as I don't have the money for that!

Thanks for any help you can give me..
Emma

In news:emmasb.40fev2@no.email.invalid,
emmasb typed on Wed, 21 Oct 2009 15:53:49 -0500:
> Hi
>
> I think my backlight has gone/is going on my laptop. The screen is
> pink on boot up and then fades to black very quickly.
>
> I have changed the inverter but it made no difference
> checked it works ok with external moniter
> checked the hibernate button isn't stuck
> checked connections
>
> So I think it must be the back light itself, I don't quite know where
> it is though, looked into the screen and there is a taped wire? going
> across the screen but nothing that looks like a tube..
>
> So
>
> Can anyone tell me how i get to it on my laptop?
> Is it something I can replace myself or do I need a complete lcd
> screen - really hoping not as I don't have the money for that!
>
> Thanks for any help you can give me..
> Emma

Sure sounds like the florescent lamp, since you already changed the
inverter. And you checked the cables and it doesn't sound like the lid
switch.

The good news is the lamp is replaceable and you can buy them for 40
bucks or less. The two thicker wires from the inverter going to the LCD
are the wires going to the lamp. You probably have to partly disassemble
the LCD screen to get to it.

--
Bill
Asus EEE PC 701G4 ~ 2GB RAM ~ 16GB-SDHC
Windows XP SP2

"emmasb" <emmasb.40fev2@no.email.invalid> wrote in message
news:emmasb.40fev2@no.email.invalid...
>
> Hi
>
> I think my backlight has gone/is going on my laptop. The screen is pink
> on boot up and then fades to black very quickly.
>

The pink colour gives it away as the lamp.

Although lamps can be had, getting at the failed lamp is a whole different
matter.

Yep sounds like the CCFLs (Cold Cathode Flourescent Lamps). Does this
help? 'Backlight Repair Guide'
(http://www.dnd.utwente.nl/%7Egrit/backlight/ccft.html)... and to your
particular machine 'have a look here.'
(http://repair4laptop.org/notebook.html)

You do need to be very careful they are about the thickness of a
knitting needle and are very fragile, they will take no stress what so
ever.

They are powered from an DC to DC inverter that transforms the battery
voltage up to around 1,400V when running.... these do fail as well
giving various symptoms, but I'd go for the lights.

davy

Much appreciated, the 'how to...' link looks really good, I will give it
a go and report back.

Thanks again

Emma

It is actually INSIDE the panel itself.

This is not normally a "do it yourself" project, although it depends on
how the LCD panel is constructed (a few of them can be changed without
too much difficulty; most can't).

However, there are places that will change the backlight (the total
cost, including the lamp and the labor, is usually about $100). You may
be able to find an entire replacement panel for about the same amount.


emmasb wrote:
> Hi
>
> I think my backlight has gone/is going on my laptop. The screen is pink
> on boot up and then fades to black very quickly.
>
> I have changed the inverter but it made no difference
> checked it works ok with external moniter
> checked the hibernate button isn't stuck
> checked connections
>
> So I think it must be the back light itself, I don't quite know where
> it is though, looked into the screen and there is a taped wire? going
> across the screen but nothing that looks like a tube..
>
> So
>
> Can anyone tell me how i get to it on my laptop?
> Is it something I can replace myself or do I need a complete lcd screen
> - really hoping not as I don't have the money for that!
>
> Thanks for any help you can give me..
> Emma
>
>

Try and get them for that model.... the diameter is very important and
the length needs to be considered if you are getting alternative lamps.
You'll find there is at least two depending on screen design, some are
easy to change and some are not.... but do remember to replace all the
silver foil screening back in the right place to stop any EMR (Electro
Magnetic Radiation)... radio interference!

They work and behave like those in shops except they don't have the
heaters at the end, instead they use a high voltage, plus the fact they
need to emit white light and not tinted.

davy

"davy" <davy.40hbd7@no.email.invalid> wrote in message
news:davy.40hbd7@no.email.invalid...
>
>
> They work and behave like those in shops except they don't have the
> heaters at the end, instead they use a high voltage, plus the fact they
> need to emit white light and not tinted.
>

So they don't work and behave like those in shops then.

This should ''throw some light''
(http://www.nelt.co.jp/english/products/ccfl/about.html)... suppose it
could be arguable if they are the same or not - the 'prime mover' is
different, that is the method of getting the gas ionized, the end
product is the same.

Quoting M1.5¾
> Although lamps can be had, getting at the failed lamp is a whole
> different matter..... there's only been the odd monitors where they are readily
removable, many are held in with tiny plastic clips to stop any shock or
movement...

... what worries me is LCD TV's, when they go it's usually a complete
display section - and the devils are getting bigger and bigger, 28" used
be the norm, now its 32 & 42 plus inches and bigger.

Surprising the comments you hear when you tell the customer the 'bad
news', I've scrapped a few myself no more than about 2 years old, they
think you are ripping em' off, and you get the same ol' reply, "well,
we've not had it long, it shouldn't av' gone so soon", just what can you
do?

-Any budding TV engineers out there think about a plumbing trade
instead :D-


davy

I managed to get a backlight for £13 off ebay and fit it, it works well
now, though the wires on the new backlight were slightly too short, I
have managed to bodge it a little so it all works and there is still a
connection with the foil background. I am delighted...

Thanks again

Emma

Good show.... ya saved some beer money there. :)

Davy

Congratulations.

When you replace a backlight, save the WIRES from the old backlight. If
necessary splice them for length or to get the right connector.

NOTE: Most CCFL backlight lamps use (require? - not sure) SILVER wire,
which is relatively expensive and hard to get (although I think that
Mouser and Digikey in the US do sell it). another reason for keeping
the old wire.


emmasb wrote:
> I managed to get a backlight for £13 off ebay and fit it, it works well
> now, though the wires on the new backlight were slightly too short, I
> have managed to bodge it a little so it all works and there is still a
> connection with the foil background. I am delighted...
>
> Thanks again
>
> Emma
>
>