Do not remove anything from the LCD backlight. The covering on it is to diffuse
the light evenly on the back of the LCD. Once the LCD is pressed down on it,
any wrinkles or uneveness will smooth out.
Remove nothing from either side of the LCD, other than a thin protective
flexible film that may be factory installed to protect against scratches. This
film is on the front side of most LCDs, but there is usually not any film on
the back of the LCD. In a few cases, there may be a thin protective film on the
back, and it will have diagonal lines that may be hard to see unless held up to
a light.
In any case, the protective film will come loose and lift off by rubbing it
only with a fingertip or lifting at the edge with a fingernail, and the stiff
polarizing filter must NOT be removed from either side of the LCD or the LCD
won't work. All recent kits have no protective film on the rear surface, but
there is a scratch protective film on the front that should stay in place until
ready to install the front panel sheet metal.
If you damage the LCD by removing the polarizing filter, please email [EMAIL
PROTECTED] for a replacement. Cut the pins off of the original LCD to make it
much easier to remove. These parts are not expensive to replace, but it is some
work and results in some delay to continue with the kit.
Be sure ALL pins of the LCD driver IC U1 are soldered, including pin 1 that is
round. The LCD and its backlight have to be removed to correct a poor or missed
connection on the IC socket, so be sure the connections are good before
installing those parts.
See also: http://www.elecraft.com/Apps/Alert15.html
--
73, Gary AB7MY
=
[EMAIL PROTECTED]
Elecraft Technical Support
Original Message Subject: FW: [Elecraft] K2 - SN4511
Diffuser Question
Date: Thu, 04 Nov 2004 09:45:45 -0600
From: Masleid, Michael A. [EMAIL PROTECTED]
CC: elecraft@mailman.qth.net
Hello Malcolm,
I am a bit confused with LCD backlight diffuser.
It has a really nasty looking thin film on top which appears to be protective
only then below it another matt white
thin film which appears to be attached at LED ends of the diffuser only.
Looking at the instructions it appears to say that I should not remove any of
these.
Help please. Do I remove the top one which looks awful, both or none?
My LCD diffuser had 4 layers. The back side was thin as paper and was white.
Next was a thick, water clear, plastic
sheet, same thickness as printed circuit board material. Next was a thin,
soft, white diffusing layer that was only
attached at the LED ends of the plastic plate. Next was a really crummy thin
film, like you'd wrap a sandwich in for
lunch. This was buckled up in places, and looked like it might show up in the
display. I tried to make it be flat,
but that made it worse.
The way the thing is supposed to work is light bounces around in the clear
plastic plate. Some scatters off
of the back side white layer and shines through the front. Some gets caught by
the front white layer and also
shines through the front. The idea is to pipe the light around in the clear
plate so that it spreads out evenly,
and then lets some of the light leak out the front by scattering from the top
and bottom films.
So, don't damage or remove the bottom (backside) white film. Don't damage or
remove the top (frontside) matt white film.
I don't think the crummy, slightly cloudy looking film that protects the top
matt white film should be there, but
I could be wrong. I took mine off. My display looks just fine, but I can see
a little extra brightness at the left
and right edges from the LEDs.
73 and GL, Michael, AB9GV
Juno Platinum $9.95. Juno SpeedBand $14.95.
Sign up for Juno Today at http://www.juno.com!
Look for special offers at Best Buy stores.
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com