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1  Screen Tablet malarky / Heyaaaalpppp / Re: Advice on a repair with a DTK-2100 on: October 10, 2018, 08:26:47 PM
I found 30KOhms of stray resistance between the clock and ground due to a faulty inverter at position "U50" it's responsible for part of the clock signal going to the Wacom QFP chip. The faulty chip is labeled W62, and appears to be a common source for why the DTK models will not respond to input. I replaced it with part SN74LVC2GU04DCKT and the issue was resolved. You can see more on the issue here if desired. I leared a loooooot about how the digitizer works while playing with a scope and looking for this issue.

I figured I'd post the answer here since you guys may bump into this sort of problem.
2  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: October 10, 2018, 08:20:26 PM
Not to revive a dead topic, but if you still have that digitizer board I just did a bunch of work on DTK Digitizers and could help diagnose the issue, or I'd be happy to buy the spare board as a back up part. I do a lot of cintiq repair.
3  Screen Tablet malarky / Heyaaaalpppp / Advice on a repair with a DTK-2100 on: October 03, 2018, 05:02:40 PM
I am trying to get some advice on a DTK-2100 (Intuos-4 style Cintiq 21-UX)
This appears to be a very common issue, as evidenced by this related thread:

Here is a snippet from the email I sent to Wacom (It would be so much easier if I could just buy the board new......)

I did some investigation into my repair issue with the DTK-2100s and I tried replacing the Wacom W4027F chip (this was a suggestion in the other topic) (taken from a functional Intuos 4 Small) to see if it resolved the issue, which it did not, there was no change in behavior), I then proceeded to gather test voltages from several of the test points on the board, I noted the ones that were off by a substantial amount and was hoping I could get adviced on the repair, if not I will have to proceed with replacing many components in the region until something works. Here are the Test points that do not work on my CON-348(X) board, Note, it also has a Qisda P/N of 5E.0VJ41.001 (of ironic note, of the 3 boards I have only the one from JAN 2011 is functional, while the ones from May and Feb 2011 have failed...)
Test Point : Good Voltage (on active functional board) : Bad voltage (on BOTH non functional units).
TP62 : Good (-)10mV : Bad (+)2mV
TP65 : 2mV : 0mV
TP71 : 1.75V : 5V
TP63 and TP64 : ~1mV : ~30mV
TP68 : 3mV : 0mV
TP6 : 11.5V : 12+V
TP3 and TP83 : 22V : 24-25V

The most obvious aberration was that TP62 clearly had a low negative voltage in the good board, and TP71 was not at 5V in the good board, indicating it's voltage seemed to be uncontrolled in the bad boards.
It was also unusual that TP6 and TPs 3/83 had higher voltages in the bad boards, I am uncertain if that was just coincidence though, as I assume there's flexibility in the 12V line and in the voltage after the doubler, or maybe it caused the cascade of failure.

It's really sad that these failed so early I bought them broken back in 2016, that's only 5 years after they were manufactured. Assuming they weren't put to use on day one, they had less than 5 years of use. I just want to restore them to glory, any help is appreciated.

Will try to upload a high res scan, but... my scanner is not that great...... It's canning now and looks mad blurry.

For immediate reference, here was the other guy's scan. (same board)
4  Screen Tablet malarky / Successful builds! / Re: 21.5 inch LCD tablet : PTZ-1231W + AOC2269 on: October 03, 2018, 04:50:44 PM
Sorryyy, never ended up going through with the copycat build >.<
5  Screen Tablet malarky / Useful Links / Bunch of Intuos 4 XLs on ebay right now 5/2015 on: May 15, 2015, 04:40:53 PM
Hello everyone,
if anyone's been thinking about going for an XL build, a refurbisher just posted a bunch of decently priced Intuos 4 XLs on the ebays at least in the US.
6  Screen Tablet malarky / Design issues / Re: Suggestion on Screen/protector Material on: March 29, 2015, 04:09:22 AM
So, something like one of these?

It's so expensive, and the reviews on similar products on amazon are not great between both difficulty of application, and not providing quite the same surface as a stock cintiq. (more pen grab, too glossy, etc)

I ordered a busted old 15x PL-550, as well as a few non-functioning Tablet PCs, so maybe I'll get some more insight into the surface.

It seems like it's a semi-gloss or satin finish glass from the way people describe it? Is it possible to get something cut like that? Based on the cost of a protector it'd probably be cheaper to just get the cut surface.
7  Screen Tablet malarky / Design issues / Suggestion on Screen/protector Material on: March 25, 2015, 10:20:23 AM
Hello, All,
I am aiming to make a tablet that has the "surface feel" of a real wacom tablet. How do they make it "feel right" is it some kind of  built-in screen protector, or is it just tempered glass? What gives it that special feel? Or am I just making stuff up?

I was reading some other post about optical bonding, is this now cheap enough to do in-home without breaking the bank? It'd be way sweet to just bond an LCD to some glass.

8  General Category / General Chat / Intentionally different subject header for no reason. on: March 04, 2015, 07:27:51 AM
Couldn't we prevent spam by requiring the subject header to be the "Re: <Thread Topic>" for a post to get posted? Is that a thing we could do?
9  Screen Tablet malarky / Heyaaaalpppp / Re: Can't find a suitable screen on: February 23, 2015, 11:07:47 PM
Wowweee, yeah XDjackieXD is very right.

the ipad 3+ retina screens are as low as $37!, and the controller isn't expensive at all!
10  Screen Tablet malarky / Heyaaaalpppp / Re: Can't find a suitable screen on: February 23, 2015, 05:17:35 PM
Here's the same one but cheaper:

or even better? :

I'd say it looks like there's a decent probability of it being a good one for your project. It's IPS, and LED backlit, so the jitter will likely not be a problem.

I'd wait for a second opinion though, I'm still a little bit of a n00b here.
11  General Category / Who are you? a.k.a WHY CAN'T I POST? / Re: REPLY REQUIRED BEFORE ALLOWED TO CREATE A THREAD on: February 19, 2015, 08:55:43 AM
Hello Bongofish, just another guy  that's been lurking around the forums in preparation of a build. I've been following reading the successful builds (and some of the unsuccessful builds), and have settled on starting with an attempt at duplicating bumhee34's XL build in "budget-mode" for now.

I've also been looking over Aerendraca and Bumhee34's Retina-class builds and been wondering if a 4K build based on the ~15" 4K laptop panels would be worthwhile as a "non-budget-mode" build. (Would retrofitting an old penabled be a good idea for this?)

Rather than taking the multilayered acrylic approach, I may try using minimal materials by 3D-printing some supports for the acrylic layers. Advice along the way is welcome.

I probably won't actually post anything big for a couple weeks due to "life" but I'm definitely excited.

Nice to meet everyone!

Clarification, is it "Bong o' Fish" or "Bongo Fish"? I prefer assume the latter. Either way, weird forum name.
12  Screen Tablet malarky / Successful builds! / Re: 21.5 inch LCD tablet : PTZ-1231W + AOC2269 on: February 11, 2015, 08:03:20 PM
I got a response from an AOC rep, he had forwarded my inquiry up to a product manager, and I got this response,

'Yes, all "2269" series use the same panel.'

So, hopefully it works without jitter! I'll post a new thread in the build logs once all the stuff comes in.
13  Screen Tablet malarky / Successful builds! / Re: 21.5 inch LCD tablet : PTZ-1231W + AOC2269 on: February 09, 2015, 09:01:43 PM
Hello, Aerendraca,

I think Bumhee34's might actually be an "Alphascan AOC 2269", which seems to be really expensive ~$280, compared to the I2269Vw, and seems to be a Korean model? (But it looks exactly the same!)

It may or may not be different from the others. I sent AOC an e-mail on Saturday morning asking about the panel for those, and also the I2267Fw, but haven't gotten a response yet.

Thanks for the panel model, which btw, I'm quite curious how to that info. I searched for hours yesterday to no avail x.x
14  Screen Tablet malarky / Monitors / Re: New build planning with an Intuos3 A3 wide on: February 09, 2015, 08:40:46 PM
That would probably explain why a number of the models listed on TFTcentral just say something like '21.5" WS IPS' and don't provide any specific information.

I guess I'll take my chances and order a decently priced 21.5" by AOC. $96 for a I2269Vw in my region.

I'm a 100% linux user, but I plan the build for my girlfriend and/or other artist friends that mostly use Windows, so good to know Wacom's got decent support, I'd completely forgotten to think that over.

Other thoughts:
Do they even make Glossy 1080p 21.5" panels? I can't seem to find any.
15  Screen Tablet malarky / Successful builds! / Re: 21.5 inch LCD tablet : PTZ-1231W + AOC2269 on: February 09, 2015, 02:54:33 PM
Hello, I had a question, Bumhee34!

Did you happen to get a picture or remember the model number of the panel that you pulled from the AOC2269? This monitor doesn't seem to be available in America, and I'm trying to replicate your seemingly immaculate build. (The AOC2269 looks exactly like the AOC I2269Vw though, so I suspect they may be the same thing.)

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