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Thread: Toshiba T3200SXC needs new LCD scree, need help finding compatible replacement.

  1. #11
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    Quote Originally Posted by k2x4b524[ View Post
    So you took this from grayscale and made it into color?
    Not in this case, the T3200 SXC had a color screen to begin with (hence the C in the model name)
    The one big difference is that the new screen is 800x600, while the old screen was 640x480

    There was another model called the T3200SX which is the same machine, only with an amber gas plasma screen. I believe this same modification could be done to one of those since I am pig-tailing off of the VGA out and not using the original internal wiring to drive the monitor.

  2. #12
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    Nice! And 640x480 to 800x600 is nice too

  3. #13

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    Quote Originally Posted by new_castle_j View Post
    There was another model called the T3200SX which is the same machine, only with an amber gas plasma screen. I believe this same modification could be done to one of those since I am pig-tailing off of the VGA out and not using the original internal wiring to drive the monitor.
    I would never do that on a working plasma, I think those are such dang cool screens
    My Vintage computer/blog site
    Searching for a keyboard for a WYSEpc WY-1100.

  4. #14
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    Quote Originally Posted by RWallmow View Post
    I would never do that on a working plasma, I think those are such dang cool screens
    But in this case the original screen was bad. It would be a workable solution for a dead plasma screen

  5. #15

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    Quote Originally Posted by smeezekitty View Post
    But in this case the original screen was bad. It would be a workable solution for a dead plasma screen
    For sure, that's why I said I wouldn't do it to a working one

    I am going to try something like this to my Zeos 386 with a bad LCD, I'll just have to find a VGA screen the right size.
    My Vintage computer/blog site
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  6. #16

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    Quote Originally Posted by new_castle_j View Post
    I've been researching this on my own, but not sure if I understand correctly. The pin out on the manual lists the following signals:
    R0, R1, R2, G0, G1, G2, B0, B1, B2

    To me this would suggest a 9 bit RGB signal, 3 bits for each R, G, B
    perhaps over a TTL interface?

    The most basic modern 10.4" screens I can get a datasheet for seem to require 18 bit TTL, 6 bits per color..

    It's an old thread, but I just managed to install a new 10.4 inch 640x480 TFT screen into that machine. I 3D printed some mounting adapters, because the new screen had smaller case, and I also had to do solder some wires. The new screen was regular 486/Pentium 1 laptop-style 18 bit, 6bit per color, similar screens are also used in industrial machines. But I found out that this isn't a problem, because you can easily convert that to 9bit. Just connect R0 with R1, R2 with R3, R4 with R6 etc... and it requires no logic chips or anything else at all. The only function of these R G B lines is setting the brightness of each pixel. I etched some small adapter PCB at home because the new screen had 0.5mm ribbon connector with 32 pins and I couldn't solder wires to the pins. So I soldered the ribbon to the adapter, soldered the 2mm pitch connector and I had to solder some additional wires manually, from the pads visible on PCB to appropriate pins (service manual is needed to do that).

    So, if anyone else has T3200 with broken screen, it's possible to fix and you can use more modern TFT panels

    lcd1.jpg
    You can see white 3D printed parts

    working2.jpg
    Previous owner has left German DOS on the disk

    adapter22.jpg
    (that's probably not professionally designed PCB... and it should be front layer, not bottom - it shouldn't be mirrored)

  7. #17

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    Update (i can no longer edit my post):

    If you will connect everything the way I did it will work, but it will look okay only in 16-color VGA mode. I noticed that such connection is incorrect, because it raises the contrast by high amount, when 256 colors are displayed - darker colors are darker than they should be, and bright are brighter. Only basic colors some mixes of them are okay.

    The explanation is simple, just look at this:

    When you wire R0 with R0 and R1, R1 with R2 and R3 and R2 with R4 and R5 (laptop connector bold), you will get following values for 8 possible shades of red color (decimal and binary):

    00 000000
    03 000011
    12 001100
    15 001111
    48 110000
    51 110011
    60 111100
    63 111111


    Colors aren't linear now, it is clear when you look at decimal values. The curve would look like this:
    curve11.jpg

    If you want to use 3-bit LCD controller with 6 bit LCD screen, you have to wire it the following way:

    R0 with R3, R1 with R4, R2 with R5. That's only 3 wires for a color channel, other wires remain unconnected.

    Colors are linear now:

    00 000000
    08 001000
    16 010000
    24 011000
    32 100000
    40 101000
    48 110000
    56 111000

    curve10.jpg

    The only downside is that the screen is about 11% darker (because max. value should be 63) - but this isn't noticeable at all.

    I hope that this post will be helpful for anyone trying to fix the screen in old laptops. It is very hard (or expensive) to find a matching screen for such old hardware and it will be often necessary just to use what you can find and adapt it.

    By the way, you can probably put TFT screen in place of DSTN screen and vice-versa - I tried swapping screens of my Siemens-Nixdorf PCD-4ND laptops (it was easy to do because they are being held just by 3 screws and there are no cables, just built-in connectors) - and different types of screens worked in different laptops.
    Last edited by wjpl; February 28th, 2016 at 01:06 PM.

  8. #18
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    Quote Originally Posted by wjpl View Post

    I hope that this post will be helpful for anyone trying to fix the screen in old laptops. It is very hard (or expensive) to find a matching screen for such old hardware and it will be often necessary just to use what you can find and adapt it.

    By the way, you can probably put TFT screen in place of DSTN screen and vice-versa - I tried swapping screens of my Siemens-Nixdorf PCD-4ND laptops (it was easy to do because they are being held just by 3 screws and there are no cables, just built-in connectors) - and different types of screens worked in different laptops.
    Brilliant! I love it, you have figured out how to use the original wiring, that's what I couldn't do so I cheated and piggy-back soldered onto the VGA out.
    I wanted to run Slackware Linux on this machine, but found that the memory is a tiny bit too small. Toshiba had some kind of proprietary 2MB SIMMS in this machine, more of those SIMMS are nowhere to be found, if only there was a way to get it to recognize other SIMMS as 2MB, then I believe Slackware would run ok on this machine, 13MB is the maximum supported memory.

    BTW, the XTIDE ROM works great with this machine too, it will enable the onboard IDE controller to recognize any IDE disk so you're not limited to the Connor Peripherals factory hard drives anymore!

  9. #19

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    Thanks for the info about XTIDE

    Quote Originally Posted by new_castle_j View Post
    Toshiba had some kind of proprietary 2MB SIMMS in this machine, more of those SIMMS are nowhere to be found, if only there was a way to get it to recognize other SIMMS as 2MB, then I believe Slackware would run ok on this machine, 13MB is the maximum supported memory.
    I am having some problems with memory now, because parity error sometimes shows up and memtest crashes even before it starts. I removed 6 1MB modules and the problem remains even with onboard 1MB memory, so I am in process of desoldering the onboard chips and soldering DIP sockets, so I can easily install and remove and check what's not working.

    I found some information here (in comments) about using different memory modules, but I didn't try it:

    http://omolini.steptail.com/t3200sx/...T3200-SXC.html

    I have discovered out how to make a standard 2 Meg or 1 Meg 30 pin SIMM work in the T3200sx. What you have to do is cut the trace that is connected to the CASP line (pin 2 and connect that to the CAS line (pin 2). This will result in a 1 Meg module that will work with out the parity error that you will get with out this modification. I have noticed that your 2 Meg Toshiba SIMMs have only 4 chips on them instead of the usual 9 or 3. It would be interesting to try and find the datasheet for the chips and try and figure out the pinout of a 2 Meg Toshiba SIMM. In my T3200sx my 2 Meg modules have 6 chips and I have only been able to find the datasheet for 4 of them. I think that the other 2 are the parity chips but I am not sure. I have found out that pin 19 is grounded on the 2 Meg Toshiba SIMM. I am also guessing that pin 28 on the 2 Meg Toshiba SIMM is A10 but I am not sure. By the way feel free to post this information on your website where ever you think that people will read it.
    I wonder if I can install 2MB chips instead of 1MB I desoldered. I also noticed that onboard VGA card has only 256KB of memory, it's WD 90C21 and I can't find the datasheet. I wonder if it would be possible to extend the video memory to 512KB, by piggybacking new memory chips, just like in Amiga 600 (like that: http://eab.abime.net/attachment.php?...6&d=1380828442).

  10. #20

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    Quote Originally Posted by wjpl View Post
    It's an old thread, but I just managed to install a new 10.4 inch 640x480 TFT screen into that machine. I 3D printed some mounting adapters, because the new screen had smaller case, and I also had to do solder some wires. The new screen was regular 486/Pentium 1 laptop-style 18 bit, 6bit per color, similar screens are also used in industrial machines. But I found out that this isn't a problem, because you can easily convert that to 9bit. Just connect R0 with R1, R2 with R3, R4 with R6 etc... and it requires no logic chips or anything else at all. The only function of these R G B lines is setting the brightness of each pixel. I etched some small adapter PCB at home because the new screen had 0.5mm ribbon connector with 32 pins and I couldn't solder wires to the pins. So I soldered the ribbon to the adapter, soldered the 2mm pitch connector and I had to solder some additional wires manually, from the pads visible on PCB to appropriate pins (service manual is needed to do that).

    So, if anyone else has T3200 with broken screen, it's possible to fix and you can use more modern TFT panels

    lcd1.jpg
    You can see white 3D printed parts

    working2.jpg
    Previous owner has left German DOS on the disk

    adapter22.jpg
    (that's probably not professionally designed PCB... and it should be front layer, not bottom - it shouldn't be mirrored)
    Hi,
    I have the same problem. I have a perfect T3200sxc with a defective lcd panel Sharp LQ10D013
    But i can't find any compatible 10.4 inch tft lcd screen in the netherlands.
    I'm not really into lcd technology so i wonder how do i connect all these data lines to a modern 18 bit LCD ?

    Screenshot_2017-06-19-20-24-01.jpg

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