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Author Topic: greenun's build  (Read 16932 times)
greenuns
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« on: December 27, 2007, 05:23:24 AM »

hi guys
back to the forum with another build, yay!
I made a  15" diy-cintiq awhile ago but small screen, crappy resolution just didn't do it for me...
so i ripped apart my dell 20" wide., got myself an Intuos 12x18 USB and ready to do some damage Smiley
so far the screen comes on, registers the pen, all pressures working but JITTERS!!!! and random left + right clicks...
here are the pictures so far...

this is my monitor
LG-Philips board
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=320-5123


LCD panel



only the plastic slab + all the films + a black plastic frame



profile of the screen. the thickness is exactly 1.5cm.



all the electronic stuff



CFL wires connecting to the power board
these need to be extended...if I could get the same wires i know extending them won't mess anything up, anyone know where I could get them?



one of the CFL, there are two, top and bottom



more wires need extending..



but my god the jitters and the random clicks need to be fixed...
From what i've read, it looks like i need to shield the circuitry and power board...
dont know if i want to go with aluminium....is there another material I could use?

do you guys think the jitters are from the power board or the LCD itself?
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Switz
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« Reply #1 on: December 27, 2007, 07:41:48 AM »

Good build log, I would suggest using the old fashioned plastic wrap/foil method, but idk if that will work too well.

I remember people suggesting some sort or lead tape or something that stops magenetics or, idk lol

remember one thing.

GOOGLE IS YOUR FRIEND
DO SOME RESEARCH  Tongue
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Made that, not my best, but I love it.  Firefoxy lol
It's all fun and games till someone loses a testicle.   Cheesy
Chems
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« Reply #2 on: December 27, 2007, 03:54:37 PM »

Im 99% sure that the jitters dont come from the power board but from the circuits directly linked to the LCD itself by the long ribbon cables. Shielding them will help the most.
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greenuns
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« Reply #3 on: December 27, 2007, 10:20:23 PM »

i do think it's the circuit board as well...
the monitor has a metal casing that is the same size and covers the circuit board
when I put this metal casing underneath the circuit there's definately less jitters...

do I need to get an EMI/RF shielding material?
will this do? just a sample kit but looks promising...$25 for a whole much of materials...Smiley
https://www.intermark-usa.com/store/product.php?productid=7&cat=15&page=1

for the foil trick, do i wrap it with foil first or the plastic wrap first?
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Switz
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« Reply #4 on: December 28, 2007, 04:22:48 AM »

plastic wrap. then foil, then another top layer of plastic wrap
as much foil as needed without being too bulky
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Made that, not my best, but I love it.  Firefoxy lol
It's all fun and games till someone loses a testicle.   Cheesy
Chems
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« Reply #5 on: December 28, 2007, 01:57:30 PM »

Jitters do come from some peoples power supplies and control boards. But I found I didnt get any from mine and that all the jitters were been caused by the side circuits. So I shielded all of those and my build was super.
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greenuns
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« Reply #6 on: December 29, 2007, 05:17:41 AM »

hey guys
After an entire roll of foil, the wrap and foil trick is kinda working...much less jitters..
The jitters, drop outs, random clicks all happen at the top of the screen and only minor jitters at the bottom of the screen.
i'm starting to think if the entire LCD is the problem and not just the circuit board..
back to more research...

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Chems
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« Reply #7 on: December 29, 2007, 05:36:06 PM »

Im gonna tell you again, its the circuit boards that are attached to the LCD directly.

When applying the foil you need to make sure you get all of those in, like fully wrapped even inbetween the ribbons. And then earth them as well.
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Switz
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« Reply #8 on: December 29, 2007, 09:12:21 PM »

Im gonna tell you again, its the circuit boards that are attached to the LCD directly.

When applying the foil you need to make sure you get all of those in, like fully wrapped even inbetween the ribbons. And then earth them as well.
Make sure to be careful to not brake the edge connectors though.

That would not be good xD
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Made that, not my best, but I love it.  Firefoxy lol
It's all fun and games till someone loses a testicle.   Cheesy
greenuns
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« Reply #9 on: December 30, 2007, 11:35:24 PM »

it's all shielded with wrap and foil...but no difference..
did I do it right?
I tried it without the backlight...no difference....


but it got noticeably better when I changed the resolution from 1680 x 1050(native) to 1680 x 1000

and how do i earth the foil?

Edit: Instead of using the DVI port I tried the VGA port and lowered the resolution...
at 800x600@60Hz there is absolutely no jitters what so ever..not even at the top.
As i increase the resolution to its native (1680x1050) the jitters appear again...
at 1280x800@60Hz it's workable but not at native resolution and the screen looks fuzzy...
also increasing the refresh rate worsen the jitters..60Hz seems to be the optimal and I want to try lower (50Hz) but 60 is the lowest it'll go on OS X.
« Last Edit: December 31, 2007, 12:38:32 AM by greenuns » Logged
Switz
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« Reply #10 on: December 31, 2007, 12:53:17 AM »

it's all shielded with wrap and foil...but no difference..
did I do it right?
I tried it without the backlight...no difference....


but it got noticeably better when I changed the resolution from 1680 x 1050(native) to 1680 x 1000

and how do i earth the foil?

Edit: Instead of using the DVI port I tried the VGA port and lowered the resolution...
at 800x600at60Hz there is absolutely no jitters what so ever..not even at the top.
As i increase the resolution to its native (1680x1050) the jitters appear again...
at 1280x800at60Hz it's workable but not at native resolution and the screen looks fuzzy...
also increasing the refresh rate worsen the jitters..60Hz seems to be the optimal and I want to try lower (50Hz) but 60 is the lowest it'll go on OS X.

This seems to go with my original theory that depending on the resolution, more data is going into each pixel (maybe causing more interference.  But idk if that is even how lcds work xD)
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Made that, not my best, but I love it.  Firefoxy lol
It's all fun and games till someone loses a testicle.   Cheesy
greenuns
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« Reply #11 on: December 31, 2007, 01:11:19 AM »

and maybe more power + voltage too

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Chems
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« Reply #12 on: December 31, 2007, 05:13:35 PM »

To earth the foil all you need to do is a attach a little wire to the surface of the foil then run the wire onto the plastic or something that will be incontact with the desk.

Interesting about the res, I think its been bought up before. That might suggest why the 15inch monitors work so well as their native is normally 1024x768 which isnt very high.
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greenuns
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« Reply #13 on: January 02, 2008, 08:57:39 PM »

hey guys
i don't think this monitor is suitable for the project...
no matter what I do i get too much jitters...
also I think I broke a few circiuts because I get a thin fuzzy vertical line...
at this rate I might as well save money for the real deal..or even the 12" wacom...
so unfortunately my build is going to be on hold till something comes up
thanks for the help guys

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greenuns
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« Reply #14 on: January 03, 2008, 06:09:00 AM »

hi guys
i have one question though...
as a last resort, i'm thinking of getting one of these...
http://www.l-com.com/item.aspx?id=6616&cmp=frg

do you think it'll work? would it work better than the foil trick?
if i do get it do i tape it directly onto the circuit board or wrap the boards with plastic wrap first?
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