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1  Screen Tablet malarky / Heyaaaalpppp / Re: Guess who :) on: August 31, 2017, 09:28:41 PM
Well there you go. Good call. Smiley
Lower ribbon cable reseated.

[attachment=1]

Super happy bunny Smiley

2  Screen Tablet malarky / Heyaaaalpppp / Re: Guess who :) on: August 18, 2017, 07:57:06 AM
Thanks for the reply.

It's reasonably guess-able I think, the board layout is pretty logical so I know roughly where the problem is and could narrow it down further with just a tape measure.   I think I could get a hot air station fairly cheaply and I'm in no rush so can wait a few weeks for it to arrive from China if necessary.   It'd be a useful thing to have anyhow, it's a good excuse.   Smiley

I can be keeping an eye out for possible donor boards in the meantime.
3  Screen Tablet malarky / Heyaaaalpppp / Guess who :) on: August 15, 2017, 07:07:37 PM
Hello.

Long time no post and all that  Grin   

I have a similar problem to the guy in the,  dropped 21UX thread.
I've snagged myself a dirt cheap 21UX. It was cheap because a strip (about 2cm across the whole center of the screen) isn't picking the pen up. I figured it might be a loose ribbon cable but it doesn't look like that's it. (re-seated all the cables and no change)
This is the main board:
[attachment=1]

It's going to be one of these circuits in the middle

[attachment=2]

 I was hoping for an missing SMD or dry joint something but there isn't anything obvious that I can see.
I'm not really into electronics above the simple soldering and testing level but I'll give anything a go. 
I may have to try to get a replacement board from somewhere, perhaps a scrap one with a cracked screen or something.



 
4  General Category / Forum news / Re: And we're back in the room on: October 03, 2016, 09:14:23 AM
Yep, I have local copies of everything, plus the server is backed up by the host. 
It's a semi-manual process copying them locally mind, I must look into automating that.
5  General Category / Forum news / And we're back in the room on: October 01, 2016, 10:15:33 PM
The forum was down for a few hours there.
I fixed it as soon as I found out.  There was a corruption in the settings file, could be a hack attempt perhaps, I'll keep an eye on things and see if I can beef up security.
6  General Category / Can't stop building / Re: So where can I get ... on: December 14, 2015, 04:07:40 PM

I just read that apparently UV light wrecks the liquid crystal, which is why LCD polarisers are also UV filters.
7  General Category / Can't stop building / Re: So where can I get ... on: December 14, 2015, 02:10:25 PM
Nice video, I dare you to give it a go! Wink

I actually have tried this some time back when I had the idea of replacing the ccfl backlight with uv leds. I wanted to use the screen to expose photoresist for making my own pcbs, I wanted to remove the film on the screen to let more light through, seems like a silly idea now though.

So you expose the PBC using an image on the screen?
8  General Category / Can't stop building / Re: So where can I get ... on: December 14, 2015, 09:51:07 AM
I meant the other way round, the polariser is on the camera side. So the front gathers the polarised spec + unpolarised diff and delivers it to the polariser on the back. 
So whether the spec gets through depends on the twist state.

We tried using a monitor as a polarised light source just to get a proof of concept for the whole thing. It worked (of course) but wasn't very bright, so we'll need some bright lights and some polar film.
I've found a place in the states that's the cheapest source I can find without buying bulk quantities, though there were a few places on alibaba/ali express that did a 10 pack of ipad sized sheets for a few dollars a sheet.

There was also a vendor selling 300m rolls of the stuff but that's probably 299.5 m too much and besides it weighed something like 400kg so shipping and handling would be a problem. Wink,
9  General Category / Can't stop building / Re: So where can I get ... on: December 13, 2015, 09:37:15 PM
If my thinking is right you'd only need to get one polariser off.
You'd present the polarised side to the lens, If you take a shot with the screen off then your get 0 degrees, with the screen on then it gives the light a twist on the way through and you get the 90 degrees.

I was thinking of getting some cracked lenses to strip the polariser off to put over the lights,  it is do-able with a blunt knife, but you can get raw polariser from china or the States for about the same as a broken panel and it's not wrecked.

I may be stripping a couple of laptops before I bin them at some point so I might try it on one of those to see how it works.

10  General Category / Can't stop building / Re: So where can I get ... on: December 13, 2015, 05:45:27 PM
https://www.youtube.com/watch?v=a4cnrPMo6_s
 Grin

Dammit I've also just found out you can get conductive coated glass on ebay. and recent experience tells me it's not that hard to split a screen and get the liquid out.
The glass is expensive though, (£35 for a 100mm square piece) but I'd love to do it just to try it out.


Also as an aside I've finally got myself a 20" screen cheap, It's an apple screen so used the TMDS signal format and not LVDS. At first I though it was a completely different thing so I'd have to hunt for a board to support it, turns out it's basically DVI with different pin arrangement so just a cable will do it, If I also replace the CCFLs with LEDs then that's even easier and there's less interference producers in the box.  I can even power it from an external 12/5v supply Smiley  

11  General Category / Can't stop building / Re: So where can I get ... on: December 13, 2015, 03:04:31 PM
Having done some googling LCD shutters are available in welding masks.
http://www.ebay.co.uk/itm/Auto-Solar-Darkening-LCD-Welding-glasses-Welding-Mask-Welding-Goggles-Helmet/291552735881?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D33984%26meid%3Dfa31af4575a54303a065885f35c989bf%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D271361197325
But I guess that's a different thing they're doing.

 Aerendraca - I don't get why it would need two screens? Surely the crystal either gives the light a twist or not?
I'm having trouble visualising it.

12  General Category / Can't stop building / Re: So where can I get ... on: December 11, 2015, 02:52:16 PM
It needs to be big enough to fit in front of a camera lens so 100 - 150mm square would more than cover it.
I could do with being able to switch the polariser through 90 degrees without touching the camera.

Here's the thing, if you have a polarised light source and a filter over the lens you can get a true shot of the albedo colour of a surface, rotate 90 degrees and you can get the specular reflectance values.  If you do it with four cunningly positioned lights you can also (with a bit of processing) get a surface height description or normal map. This gives you everything you need to create a physically accurate material in-game (which is the big thing at the moment).  I've seen ghetto versions using the lenses from 3d glasses, one over the flash and one over the lens, but i have a hankering for something more accurate than physically rotating a filter.

There's some examples here:
http://filmicgames.com/archives/233

It's an extension of this sort of thing:
https://www.youtube.com/watch?v=_wIgmEch1P8
13  General Category / Can't stop building / So where can I get ... on: December 11, 2015, 12:02:52 PM
I need a polarising filter that can change direction on a simple switch.
Where can I get a smallish LCD panel without the polarising film? Preferable something where the whole panel will switch on and off on a single line without having to drive an lvds board?
At a push we could use a cheap laptop to run the dewice, so could drive it as if it's an external screen at a push, I'd kinda like to avoid that though.

14  Screen Tablet malarky / Tutorials and useful knowledge / What monitor has what panel? on: December 09, 2015, 02:20:50 PM
Useful list of what monitors use which panel sorted by size.
http://lcdtech.info/en/data/lcd.panels.in.monitors.htm

Or if you're looking for a particular panel you can click through and get what other monitors use that panel.
http://lcdtech.info/en/data/lcd.panels.in.monitors.htm?pan=LM201W01

There's a list of laptops too

15  Screen Tablet malarky / Build Logs / Re: Exotiq Redux 21.5" IPS + Intuos3 on: December 02, 2015, 03:07:24 PM
Quote
OK, I'm open to suggestions for a matte 'screen protector' solution

http://www.ebay.co.uk/itm/171881430632?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

21.5Inch Resistive Touch Screen Panel 490x285mm 4Wire USB kit for 21.5" monitor   Grin
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