Bongofish

Screen Tablet malarky => Build Logs => Topic started by: robcat2075 on January 13, 2007, 06:50:37 AM



Title: Robcat2075 build log
Post by: robcat2075 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...

(http://www.brilliantisland.com/diy/DSCN0007_frontview.jpg)

(http://www.brilliantisland.com/diy/DSCN0014_backview.jpg)

(http://www.brilliantisland.com/diy/DSCN0017_screwconcealers.jpg)

(http://www.brilliantisland.com/diy/DSCN0021_backcoverremoved.jpg)


Title: Re: Robcat2075 build log
Post by: robcat2075 on January 14, 2007, 01:53:23 AM
So far everything is one phillips head screw or another.

(http://www.brilliantisland.com/diy/DSCN0023_controllershieldremoved.jpg)

(http://www.brilliantisland.com/diy/DSCN0028_mainshieldremoved.jpg)


Title: Re: Robcat2075 build log
Post by: Drewid 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.


Title: Re: Robcat2075 build log
Post by: robcat2075 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 


Title: Re: Robcat2075 build log
Post by: robcat2075 on January 15, 2007, 12:53:44 AM
more disassembly...

(http://www.brilliantisland.com/diy/DSCN0030tinytinyscrew.jpg)

(http://www.brilliantisland.com/diy/DSCN0033needstobebent.jpg)

(http://www.brilliantisland.com/diy/DSCN0034_metaltapeCCFL.jpg)

(http://www.brilliantisland.com/diy/DSCN0036_tinyteeth.jpg)

(http://www.brilliantisland.com/diy/DSCN0039_ribbonconnectorleads.jpg)

(http://www.brilliantisland.com/diy/DSCN0040_tosideconnector.jpg)

(http://www.brilliantisland.com/diy/DSCN0037_blackdoor.jpg)

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

(http://www.brilliantisland.com/diy/DSCN0042_stuckconn1.jpg)



Title: Re: Robcat2075 build log
Post by: robcat2075 on January 16, 2007, 05:57:23 AM
moving right along...

(http://www.brilliantisland.com/diy/DSCN0047_ccflliftsout.jpg)

(http://www.brilliantisland.com/diy/DSCN0048_ccflliftsout.jpg)

(http://www.brilliantisland.com/diy/DSCN0050_metalsheet.jpg)

(http://www.brilliantisland.com/diy/DSCN0054_sheets.jpg)

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

(http://www.brilliantisland.com/diy/DSCN0059_slabistapered.jpg)

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.

(http://www.brilliantisland.com/diy/badtracking.jpg)

Next I took the tablet apart...

(http://www.brilliantisland.com/diy/DSCN0056_aiptektablet.jpg)

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

(http://www.brilliantisland.com/diy/DSCN0057_slaboncircuit.jpg)

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

(http://www.brilliantisland.com/diy/bettertracking.jpg)

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




Title: Re: Robcat2075 build log
Post by: Drewid on January 16, 2007, 09:19:59 AM
Sweet, and a textbook example on logging a build as well.

Nice one.


Title: Re: Robcat2075 build log
Post by: Ferret on January 22, 2007, 11:11:29 AM
I like the style, detail, an quality of this. :)


Title: Re: Robcat2075 build log
Post by: wei803 on January 23, 2007, 02:19:23 AM
wow, i like this too. inspired me to re-do my log... hehehe.


Title: Re: Robcat2075 build log
Post by: robcat2075 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.


Title: Re: Robcat2075 build log
Post by: robcat2075 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.


Title: Re: Robcat2075 build log
Post by: Chems 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!


Title: Re: Robcat2075 build log
Post by: robcat2075 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?


Title: Re: Robcat2075 build log
Post by: robcat2075 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.

(http://www.brilliantisland.com/diy/DSCN0094_unfoldedmonitor.jpg)


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



Title: Re: Robcat2075 build log
Post by: robcat2075 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

(http://www.brilliantisland.com/diy/tablettest02s.png)

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.



Title: Re: Robcat2075 build log
Post by: Drewid on February 02, 2007, 10:33:01 AM
Have a look at the jitter thread. 

Can you adjust the read height in the drivers?


Title: Re: Robcat2075 build log
Post by: robcat2075 on February 02, 2007, 10:28:15 PM
Have a look at the jitter thread.
I'll give the foil wrapping a try.

I did try screwing the controller board back into the metal cage from teh monitor, but that actually mad things worse.  The cursor was pegged at the top of the screen.  Hard to figure that out.

Quote
Can you adjust the read height in the drivers?
I'm afriad the Aiptek driver is pretty minimal.  I tried looking through the registry but didnt' see anything familiar.


Title: Re: Robcat2075 build log
Post by: robcat2075 on February 03, 2007, 08:26:00 PM
Well, I guess I've reached the end of the line here. 

While lifting the board that runs along the top of the LCD, to wrap it, I seem to have damaged some of those very short FFCs that that attach it.  The right side of the display just displays vertical lines now.  At first it was intermittent, but now I think it's done for.  Manually repairing the connections looks impossible.

I had begun to feel that these boards are the cause of most of the curcor jitter because the farther I lfted them away from the tablet sensor the more the jitter would decrease.  But wrapping in foil only made the jitter worse..

Oh well. May you all have better results than I!


Title: Re: Robcat2075 build log
Post by: robcat2075 on February 07, 2007, 04:06:40 AM
For the benefit of posterity I think I know what went wrong.

In this pre-catastrophe pic you can see the controller board that attaches to the top of the LCD

(http://www.brilliantisland.com/diy/DSCN0094_unfoldedmonitor.jpg)

there are 8 FFCs that connect them together, and they appeard as if thery were well attached to the circuit board.

But after a certain amount of handling they came unstuck, and once they came unstuck, the only thing holding them to the circuit board were the tiny traces from the FFC to the board.  It only took a few flexes for those to fatigue and break the connection.

If i find another VERY cheap monitor i might give it another shot, but the jitter problem seems so intractable I think I'll wait until someone discovers a reliable fix.


Title: Re: Robcat2075 build log
Post by: Rumi on February 07, 2007, 06:53:47 AM
Sorry to hear about the monitor  :( , we are in uncharted territory here so it is difficult to know which monitors to go with and how to handle them. I am going to carefully try and put my Samsung back together before I break anything. I extended the controller cable so I am not sure how I am going to fit all back in.???

Anyway your experience with this one will help you with the next one.


Title: Re: Robcat2075 build log
Post by: wei803 on February 07, 2007, 07:16:16 AM
 :D Rumi, I have no problem putting back mine. But it take lots more trouble to put it back.
As usual, you'll find lot's of unwanted screws. And I left the last metal sheet to make space for extra cables.


Title: Re: Robcat2075 build log
Post by: Drewid on February 07, 2007, 10:03:52 AM
If you don't want to put it back in you could always have an LCD animated windoew in your PC case  :)


Title: Re: Robcat2075 build log
Post by: bal8664 on February 07, 2007, 05:22:26 PM
Robcat,

Your monitor appears to be the exact same as the dell 1503FP I purchased.  Same screen, inverter, and everything.  Only difference is mine has DVI and VGA.  I can't get mine to work without jittering issues so I'm curious as to how your build comes out.

I decided not to use the actual LCD screen from the 1503FP because of the FCC issues, and because I had a working LCD from a dell e153fp.  I would be more than happy to sell it to you (just the screen of course, since you have a working backlight assembly).  I'm not sure where you are located, but I am in the US.  If you are interested let me know.



Title: Re: Robcat2075 build log
Post by: nathansmith on February 08, 2007, 10:21:24 PM
I can comisserate with you as you and I were using the same monitor and I had the exact same thing happen to my monitor. The FFCs connecting the top of the screen just kind of broke off. I could press some of them down and get the monitor to kind of display a picture, but for the most part it was just completely dead.

On a side note, I did find that placing a metal shield between the top controller board and my Aiptek tablet did elimitate at least most if not all of the jitter. I just used the metal shield that was inside the back of the monitor. It was very thin, but seemed to provide enough protection to shield whatever was causing jitter.


Title: Re: Robcat2075 build log
Post by: robcat2075 on February 09, 2007, 03:41:51 AM
The FFCs connecting the top of the screen just kind of broke off. I could press some of them down and get the monitor to kind of display a picture, but for the most part it was just completely dead.
Yup.  :-[ I'm thinking if I try this again, maybe hot-gluing them so they would stay flat onthe PCB and not be tempted to lift off might work?  mere electrical tape would probablynot be enough.


Quote
On a side note, I did find that placing a metal shield between the top controller board and my Aiptek tablet did elimitate at least most if not all of the jitter. I just used the metal shield that was inside the back of the monitor. It was very thin, but seemed to provide enough protection to shield whatever was causing jitter.
  I was beginning to think along those lines, since the Aiptek has a large metal sheet right behind it, the mere presence of metal doesn't seem to be the problem and perhaps some strategically placed metal (cut from galvanized roofing steel from Home Depot?).  Maybe I'll try some experiments with my dead LCD to see if shielding really can work.

The problem is the PCBs are so closely connected to the screen it seems difficult to ever really enclose them.


Title: Re: Robcat2075 build log
Post by: Switz on February 09, 2007, 04:42:39 AM
Exactly what ball said, but i have only taken apart my lcd, not put together everything, looks almost exactly same, but ihave both inputs.


Title: Re: Robcat2075 build log
Post by: robcat2075 on February 13, 2007, 04:28:49 AM
I decided not to use the actual LCD screen from the 1503FP because of the FCC issues, and because I had a working LCD from a dell e153fp. I would be more than happy to sell it to you (just the screen of course, since you have a working backlight assembly). I'm not sure where you are located, but I am in the US. If you are interested let me know.

Hey bal, I sent you a PM about your screen