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1  Screen Tablet malarky / Heyaaaalpppp / Re: Having trouble with a Wacom digitzer pulled from an old tablet PC on: December 10, 2017, 04:47:58 PM
If possible, purchase Teensy in 3v3 or 3.3v version. If not, purchase separate 3.3V LDO (low dropout voltage regulator). Here are instruction how to install that regulator:

Teensy can run either from 5V (USB), 3.3V (external supply) or 3.3V (USB + soldered LDO) but digitizer can run only on 3.3V. Connecting them to anything higher than 3.6V may destroy them permanently (not tested yet Wink ). On board 3.3V voltage regulator is much simpler than external one.

I chose external one because Pro Micro doesn't have place for internal one.
Here are my build log (missing pics):
And here are translated version with pics:
2  Screen Tablet malarky / Heyaaaalpppp / Re: Having trouble with a Wacom digitzer pulled from an old tablet PC on: December 09, 2017, 01:51:06 PM
Clamp meter can measure current only. You need classic meter with two probes.
The best way I found is to attach negative meter input to metal shield of any connector (USB, VGA, etc.) then touch each pin (separately) with positive meter probe and read voltage.

For negative meter input I prefer to put meter probe in VGA screw or unscrew it and use that screw to mount copper wire. Here example photo with removed screws: just use force and twist that screw. It's designed to be unscrewed if need.
3  Screen Tablet malarky / Heyaaaalpppp / Re: Having trouble with a Wacom digitzer pulled from an old tablet PC on: December 08, 2017, 05:57:47 PM
Does the M400 working? I mean boot to OS and pen working?
If M400 still working, please check voltages on each pin (each wire). I'm worried about pin 1 (left blue wire). Manufacturer need to add that wire so there are risk that digitizer may not work without it.

If we forget about pin 1, connector looks like standard "14-pin" as described here:
You need pins 9 (RXD), 10 (TXD), 13 (3v3), 14 (GND). Pins 7, 8 and 12 are mostly useless. Pin 11 can be use just for fun (connect LED that shines when digitizer detects pen).

If You wish to use this digitizer with Linux, You can use USB->serial converter. If You want to use this digitizer across many platforms, WaxBee converter is the only working solution.
More info about WaxBee can be found on this forum.
4  Screen Tablet malarky / Tablet Conversion to USB / Re: WaxBee Feature Requests on: November 11, 2017, 09:35:38 PM
I just found a problem in intuos5 template. There may be bug in template, WaxBee firmware or drivers itself. Full story below.

I migrated my WaxBee tablet from intuos2 to intuos5. To do this I chose right template, set "serial input" same as on my working intuos2 template, upload firmware and have great surprise.
Only upper-left quater of tablet working. Right half and bottom half sends cursor to the edge of screen. Very strange.
Next I chose diagnostic option build in Wacom drivers. This shows me that screen respond perfectly in mm but drivers scaling data, actually doubling input value. More funny I can actually fix this by option "chose area of tablet". But clicking on edges gives me one marker at edge of active area of the tablet and next 3 markers far beyond tablet. Pretty funny.
Solution: set exactly half values in "USB tablet max coordinates" in WaxBee configuration editor. But why these values doesn't match?
Wacom driver version 6.1.7-3

Working template attached.
5  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.
6  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.
7  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.
8  Screen Tablet malarky / Heyaaaalpppp / Re: Guess who :) on: August 16, 2017, 09:57:45 PM

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.
9  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.
10  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?
11  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).
12  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.
13  Screen Tablet malarky / Heyaaaalpppp / Re: Salvaging touchscreen from a Toshiba Portege M780 on: August 05, 2017, 11:12:30 PM

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.
14  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.

And last option: users feedback. Few hundreds of user comments and samsung may notice the problem.
15  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.
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