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1  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: August 25, 2017, 03:45:40 PM
As I wrote on Drewid's topic:
One more thing. This digitizer contains two boards and flat flex to connect them.
You show active board (lot of chips) but not passive board (antennas). Flat cables shouldn't cause problems, but connectors at both ends may.
2  Screen Tablet malarky / Heyaaaalpppp / Re: Guess who :) on: August 25, 2017, 03:40:09 PM
One more thing. This digitizer contains two boards and flat flex to connect them.
You show active board (lot of chips) but not passive board (antennas). Flat cables shouldn't cause problems, but connectors at both ends may.
3  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: August 16, 2017, 10:39:51 PM
As I see, digitizer board have two main chips and strange connector to LCD board.
First chip, lets say USB chip, working fully or partially. USB and buttons working. Communication with second chip may be broken.
Second chip, let say Digitizer chip, may be broken or waiting for signal from display controller.

IMHO both boards may need repair.
4  Screen Tablet malarky / Heyaaaalpppp / Re: Guess who :) on: August 16, 2017, 09:57:45 PM
Hi.

As You can (cannot) see, single broken solder joints cannot be fixed because You cannot see the problem.
If there are soldering problem I will try to locate what section are responsible for 2cm gap, then use hot air for resolder many components, including two biggest chips. You can easily found guys with hot air at laptop/consoles service point, maybe at phone service point too.

Alternative way - try freezing spray (or compressed air can applied upside down) and hair drier. Maybe hot or cold temperatures temporary fix problem so You can narrow area then use hand solder.

If both methods fail, repair may required multichannel oscilloscope to locate broken component or track.
5  Screen Tablet malarky / Build Logs / Re: Serenitiq 2 - Wacom Intuos 4 L + Rozsnyo DP2MBPR controller + LTN154YL01 on: August 08, 2017, 04:59:03 PM
Nice trick with oled polarizer.
I must warn You. UV filter (often integrated with polarizer) is must have for outdoor OLEDs. Without that filter, OLED will be degraded by the UV light.
Hope You not have too much UV light near tablet.

Back to topic. ATA cable is OK for LVDS (USB 1.1 should be fine too), but flat SCSI cable are better because it have twisted pairs. Just look at attachment. 68pin connectors identical to ATA connectors are available too.
6  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: August 08, 2017, 04:41:06 PM
Yeah. All we can do at this moment is wait for more info or photos and keep guessing Smiley

XDjackieXD: You have different experience than me. Can You wrote Your guesses what may be wrong?
7  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: August 06, 2017, 02:30:30 PM
Quartz oscillator is the most fragile component of most electronic boards (except displays and connectors).
Broken solder joints or traces on PCB may be unrepairable. Especially when board is attached to heat sensitive flex circuit (antennas).
8  Screen Tablet malarky / Heyaaaalpppp / Re: dropped 21UX 2nd gen not responding to stylus. on: August 05, 2017, 11:37:20 PM
I have two Tablet-PC screens.
T5010 have typical construction: single PCB for Wacom chips and flat-flex circuit for antennas.
ST5111 have two solid boards, one with chips, second with antennas. Both boards are connected via board to board connector.
If You have second option, then connector may just need to reconnect and that's all. If connector wasn't the problem I guess broken quartz oscillator (hard to replace in home, easy for electronic service). If still nothing then repair of broken digitizer may be impossible or even more expensive than new digitizer.
9  Screen Tablet malarky / Heyaaaalpppp / Re: Salvaging touchscreen from a Toshiba Portege M780 on: August 05, 2017, 11:12:30 PM
Hello.

As I found after very short research, base models of M700, M750 and M780 have the same or very similar screens - LCD + Wacom EMR digitizer + resistive single-touch. Probably M700 have CCFL backlight while M780 have LED backlight.
I talk about base models, 1280 x 800 px. M750 have hi-res screens as option, 1400 x 1050 px. If that screen have LED backlight, You should look for it. As I figured 1280 x 800px have very limited compatibility - some video cards autodetect this resolution, most not but I can force specific resolution, few doesn't accept and cannot force specific resolution. That's sad.


Back to topic. LCD (glass + drivers), LCD backlight, EMR digitizer and touch digitizer are separate devices. You need special adapter for each.
1. This TabletPC is relatively old. I assume that LCD gave LVDS interface. You need to use VGA->LVDS or HDMI->LVDS converter to connect LCD to PC. I mean active converter + special cable between converter and LCD. You can buy universal converter with wide range of supported resolution (select via jumpers or upload via USB stick) or specialized converter (programmed by seller). You cannot make connector for LCD panel. You can easily buy special cable (price may vary depend on type of connector) or buy LCD with cable, cut motherboard connector and make DIY wiring.
2. CCFL backlight have separated driver, always hidden near LCD module. You need to find pinout for that module and connect it. LED backlight have independent circuit located at the same circuit board as rest of LCD things. It use the same connector too, just have separate pins. Pinout are available at LCD datasheet. BTW, LCD is useless without datasheet or at least pinout.
3. There are tree types of EMR digitizers.
You can found one with USB interface - add 3V3 voltage regulator and proper USB connector, that's all.
You can also found one with RS232 interface - add RS232 to RS232-TTL and digitizer will be usable on Linux or WinXP, or add WasBee converter and digitizer will be available on Linux, modern win (probably Mac too).
Last type have unknown interface between EMR digitizer and touch digitizer but known interface between one of them and motherboard - usually USB but sometimes RS232. So don't worry. WaxBee doesn't cost fortune and playing with these things are worth.
4. Portege series use single touch resistive panel - can be used with any tool that aren't too sharp to scratch it. That panel are made of solid back plane, air gap and thin foil on top.
As You wrote, You don't need that part so You can safety disconnect panel from dedicated hardware, maybe remove some parts inside. Really no issues here.
But I have to say something about that touch panel itself. IMHO drawing over resistive touchscreen wasn't the best option. I recommend You to replace touch panel with layer of glass/plastic or chose different tablet to play with it. But that's my opinion based on regular resistive touch devices. Maybe that screen have special durable version, who knows.
10  Screen Tablet malarky / Heyaaaalpppp / Re: Hacking Wacom Drivers... on: August 01, 2017, 09:41:36 PM
WaxBee? Sadly no. WaxBee is designed as one way converter: RS232 or ADB as input, USB as output. This tabletPC is relatively modern and I'm sure that digitizer have USB interface (probably single USB for both EMR and capacitive touch), nothing else. You may chose uC with two USB interfaces, one host (or OTG) and one device (or OTG). This uC will receive USB packets and translate it.

Second solution: I'm sure that Linux still can use legacy Wacom drivers and handle this digitizer as regular tablet with full options available.

Third solution: maybe this digitizer can detect pen ID? If yes, there might be possibility to use different pens with different button assignment.
https://www.phonearena.com/news/Note-the-progress-the-evolution-of-the-Samsung-S-Pen-from-the-original-phablet-to-the-Note-7_id83943

And last option: users feedback. Few hundreds of user comments and samsung may notice the problem.
11  Screen Tablet malarky / Build Logs / Re: Intuos4 XL (x2) 40" 4K or 27" Apple Display on: July 30, 2017, 07:22:44 PM
First, chose slim display. Second, chose single tablet.

1. Chose thin display with backlight hidden on the edges - standard for tablets and smaller screens.
There are also thick displays with light source are hidden on the back of LCD. Some of these models have "local dimming" - backlight are divided into sestions and controlled independently. That type of backlight makes display impossible to modify because thickness of backlight module.

2. You cannot connect two tablets to make one bigger. You can place two tablets close but there bust be small gap between. If no, interferences between tablets will occurs.
If You want to draw on half of display and have images, toolbars, settings, etc on second half - OK. If You want to draw in the middle - forget about it.
12  Screen Tablet malarky / Build Logs / Re: Unneeded-IQ on: July 08, 2017, 07:09:56 PM
If I see correctly, DVI connector miss many pins. This must be DVI-A input plus some funny pins for PnP, monitor ID and hot-plug detection. Definitely no digital input.

Nice work with backlight. If I see correctly, this screen are designed to easily swap backlight elements.

P.S. linked video doesn't work.
13  General Category / General Chat / reMarkable - Cintiq with E-ink? on: July 04, 2017, 09:48:11 PM
https://getremarkable.com/
reMarkable is another e-book reader. You should hear about Kindle, Nook, Tolino, etc... But reMarkable also contains EMR digitizer (there are only few eink readers with EMR digitizer) and probably resistive touchscreen. You can draw and highlight text using any pen, but dedicated battery-less pen are designed to give You the best paper-like feel. And pen are sold separately to maximize company income.
That's all information that I can found on official website.

Why I copy that on tablet forum? Because I found non-official information that Wacom wasn't only supplier for EMR digitizers. Some sources say that Wacom help them with digitizer, top layer finishing (paper-like drawing), pen and e-ink display.
What You think about news? IMHO Wacom have good deal with them and within few years we should see new Cintiq model with outdoor-readable grayscale display. Maybe even new class class of devices - portable notepad that can act as a regular tablet or that You can bring outside and sketch nature with unlimited amount of virtual paper and ink.
14  Screen Tablet malarky / Build Logs / Re: Unneeded-IQ on: June 28, 2017, 07:29:13 PM
Oops. I forgot about frequency. I build similar oscillator and notice significant frequency error at 10khz. At 100khz circuit are unstable and way off from simulation. For 1kHz You may expect less than 10% error at frequency. Sorry for scare You.

More important thing: LM358 aren't rail-to-rail amplifier. I expect non-linear distortions near minimum and maximum settings - may be noticeable but not critical.
15  Screen Tablet malarky / Build Logs / Re: Unneeded-IQ on: June 27, 2017, 07:06:59 PM
Fingers crossed Smiley

btw, LM358 have very poor performance. Oscillator with this chip will always run slower than with modern op-amp. You may need to tweak values before get it working.
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