Re: Replacing LCD CCFL backlight


N_Cook wrote:
John Vallelunga <johnv@xxxxxxxxx> wrote in message
news:48323f09$0$34483$742ec2ed@xxxxxxxxxxxxxxxxx
NoSp wrote:
My laptop's display backlight has been fading since I bought it a few
years ago, so I think it's about time I exchange the CCFL backlight
with a new one. The LCD in question is a Samsung LTN152W6-L01.

I've been trying to follow the instructions at sites such as
lcdparts.net, but there aren't any instructions for my particular LCD.
I've never disassembled an LCD before, so I'm a little worried that
I'll do something wrong.
Here are a couple of photos I've taken of my LCD:

http://img212.imageshack.us/my.php?image=samsung1sr9.jpg
http://img88.imageshack.us/my.php?image=samsung2gc1.jpg

There's a warning at the top saying I shouldn't touch the white tape.
Does this mean the white tape shouldn't be *removed*?
I've read somewhere that if you apply pressure unevenly to the LCD
panel you'll get lines and other abnomalities in the display (I assume
the white tape has been applied for even pressure all across the LCD
panel).

The problem is that it seems (at least according to what I've read
online) that I need to remove the metal frame around the LCD panel in
order to expose the CCFL backlight -is this correct?
Unfortunately the white tape extends beyond the metal frame, so if I
shouldn't remove it what do I do?

The second photo shows the metal bracket removed. It's the only one I
could remove without removing the white tape as well, and the
backlight is found underneath. Is there a neat way to remove the CCFL
without removing the whole frame?
Here is my story:
A few weeks ago the backlight on my wife's Dell 700m laptop would go out
after a minute or so. Research indicated that replacing the tube might
solve this (and this info turned out to be correct). Since I have
worked in microelectronics for 30+ years I thought I would try it.
I had an old display that I took apart for practice and that one was
very simple. The tube just slid out the side; no skills necessary! The
laptop display was very different. Nothing went according to plan and
everything was just too small , too fragile, and too precise. Yes I
read those same instructions but they are too generic. And dealing with
a 10 inch tube that is only 2mm in diameter is scary; I recommend you
order at least two!
Anyhow, after much frustration I managed to successfully replace the
tube and it now lights up properly. There were only two problems.
Somehow I managed to crack the corner of the display making it useless.
See this photo: http://www.sonic.net/johnv/ebay/700mscreen.jpg
Even ignoring this, the bottom of the display is no longer of uniform
brightness. We probably could have lived with this but be forewarned
that the same thing could happen to you. This repair may be best left
to the experts. I will never try this again on a laptop. Fortunately
newer laptops now are beginning to use LED backlights....like the one my
wife had to buy to replace her 700m. The CCFL should be obsolete in
about 3-5 years.

Good luck!

To prevent such a crack do you think such displays need a temporary scaffold
somehow attached to them while doing such work?
I'm assuming the damage was done just by holding between thumb and finger at
the corners.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/





You just have to be careful not to flex them. I've replaced a number of backlight tubes and have yet to crack a panel, I just lay a towel down on the table and set the display face down on that.
.

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