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Author Topic: Robcat2075 build log  (Read 15838 times)
robcat2075
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« on: January 13, 2007, 06:50:37 AM »

It took them two weeks to actually ship it but my LCD arrived today!

It's an IBM 9511-AG1 15" screen with external power brick.  $65 US

Except for one darkish spot near the lower left corner it looks real good with a very sharp display even though it only has a VGA connector.

It was made in 2001 so it doesn't have a state of the art viewing angle or response time.  When I scroll thru a window there is detectable ghosting; that may or may not be a problem for animation work.  I guess I'll find out.

oh boy, time to start tearing it apart...








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Robert Holmén
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robcat2075
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« Reply #1 on: January 14, 2007, 01:53:23 AM »

So far everything is one phillips head screw or another.




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Robert Holmén
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Drewid
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« Reply #2 on: January 14, 2007, 07:54:52 PM »

So only one connector for both lamps.
Is that a Toshiba screen? I can't quite see.
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robcat2075
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« Reply #3 on: January 15, 2007, 12:44:27 AM »

So only one connector for both lamps.
There's only a lamp assembly at the top edge of the screen. It has two thin bulbs in it.
Quote
Is that a Toshiba screen? I can't quite see.
yes. Toshiba NRP28-9023-116 
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Robert Holmén
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robcat2075
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« Reply #4 on: January 15, 2007, 12:53:44 AM »

more disassembly...















I was afraid to stick anything inbetween it and the ribbon to pry it up, but trying to lift it from the end broke the tip off



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Robert Holmén
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robcat2075
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« Reply #5 on: January 16, 2007, 05:57:23 AM »

moving right along...









I was surprised to see that the slab had a tapered cross section:



My first test was to put the backlight slab on my Aiptek tablet to see if it could sense the pen through it.

Yes and no... while it could track the motion of the pen across the whole surface it could only detect pen presses (clicks) over the thinnest part of the slab.  The pen would drop out as i moved over thicker areas.



Next I took the tablet apart...



...and put the slab directly on the circuit board



That worked well. It tracked the pen from top to bottom with no drop outs.



Next I need to test with the extra thickness of the LCD display and a layer of glass added to it.


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Robert Holmén
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Drewid
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« Reply #6 on: January 16, 2007, 09:19:59 AM »

Sweet, and a textbook example on logging a build as well.

Nice one.
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Ferret
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« Reply #7 on: January 22, 2007, 11:11:29 AM »

I like the style, detail, an quality of this. Smiley
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wei803
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« Reply #8 on: January 23, 2007, 02:19:23 AM »

wow, i like this too. inspired me to re-do my log... hehehe.
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robcat2075
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« Reply #9 on: January 23, 2007, 03:53:04 AM »

Thanks!  Currently I'm awaiting the arrival of my FFC extender.  Had to get the Austrian one since the USA vendor only offered a 6 inch cable and I don't think that would reach after the parts are unfolded.
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Robert Holmén
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robcat2075
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« Reply #10 on: January 29, 2007, 07:08:32 PM »

My FFC arrived today from DIY-Beamer.  The USA seller of such things didn't offer a length that would be adequate.

The first thing I notice upon opening the package is the immense smell of cigarette ashes.  It's like having an ash tray in the room.  I remember Rod Stewart once saying "In France, even the dogs smoke." I guess in Austria even the packages do.
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Robert Holmén
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Chems
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« Reply #11 on: January 29, 2007, 08:50:40 PM »

lol I noticed the same thing when I got mine! They gave me a present with mine too. Nice ppl!
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robcat2075
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« Reply #12 on: January 30, 2007, 04:43:33 AM »

lol I noticed the same thing when I got mine! They gave me a present with mine too. Nice ppl!
Yeah, I got two extra ZIF sockets not connected on a PCB.  I guess i use them to practice?
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Robert Holmén
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robcat2075
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« Reply #13 on: February 02, 2007, 09:03:55 AM »

Hooray!  After all the disassembly and unfolding and cable extending and getting stepped on by the cat, my monitor is still a monitor.




Next step, plug in the video cable fire it up and see how the drawing tablet behaves...

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Robert Holmén
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robcat2075
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« Reply #14 on: February 02, 2007, 10:14:00 AM »

Well, the first test is not encouraging...

The pointer is completely wild if the CCFL is anywhere near the tablet.

If I unplug that (I can still see a dim image onthe screen) it at least tracks the pen but is still very jittery like this



maybe shielding the controller board will help, but there's another new problem...

Even though my previous tests indicated the read height of the tablet would be big enough, once I put a layer of glass (2-3mm) over the LCD the pen drops out except over the thinnest parts of the back light.  Dont' know how to solve that.

the image above was done by sketching directly onthe LCD surface with no glass cover.

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Robert Holmén
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