Re: Replacing LCD CCFL backlight
- From: Jeff Liebermann <jeffl@xxxxxxxxxx>
- Date: Sun, 18 May 2008 20:43:48 -0700
On Mon, 19 May 2008 02:28:05 +0200, NoSp <none@xxxxxxxxx> 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.
Hmmm... Did you look at the inverter output with a scope before you
decided that it was the CCFL lamp? It could easily be the inverter.
However, as the fading took several years, it's most likely the CCFL
lamps. Still, I would measure the inverter output.
I've been trying to follow the instructions at sites such as
lcdparts.net, but there aren't any instructions for my particular LCD.
This one?
<http://www.lcdparts.net/howto/ccflinstallation.aspx>
Looks clear enough to me, but the English sucks. Basically, don't
touch, tweak, bend, or even move the row and column driver contacts.
I've never disassembled an LCD before, so I'm a little worried that I'll
do something wrong.
You can go to almost any PC repair shop or eecycling center, and get a
dead LCD panel with which to practice. I wish I had because I managed
to destroy a perfectly good laptop LCD the first time I tried to fix
one.
I'd like to add one item. Please either keep your greasy hands off
the CCFL lamp, or clean it with alcohol just before installing it.
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*?
Yep. The white tape is what holds the row can column driver board
contacts to the panel. Take it off and you're sure to get vertical or
horizontal black lines or intermittant black lines.
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).
Yep, that's correct. You don't need to do anything with the area
around the row and column driver board. The lamp is on the other end.
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?
Yep. However, you don't need to remove the entire frame. It comes
off in sections. Leave the one near the row and column driver boad
alone.
Unfortunately the white tape extends beyond the metal frame, so if I
shouldn't remove it what do I do?
You shouldn't do anything to move the board that's under the tape. If
some of the tape slops over onto some other piece of removable frame
metal, just cut it with an xacto knife and remove the frame. You can
always get some more tape and pile it on top of the cut line.
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?
It should pull out neatly *WITH THE REFLECTOR*. In other words, don't
try to extract the lamp. Pull the reflector out and the lamp will
follow. Note the the reflector is attached with double sided tape and
will require seperation with a knife or tiny screwdriver.
--
Jeff Liebermann jeffl@xxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.
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- Replacing LCD CCFL backlight
- From: NoSp
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