Results 1 to 7 of 7

Thread: Unsure of LVDS/SCSI to VGA controller stuff. (with pics and info)

  1. #1
    Constant Bitrate
    Join Date
    Jun 2005
    Location
    MD, USA
    Posts
    129

    Unsure of LVDS/SCSI to VGA controller stuff. (with pics and info)

    I've done searching on here and wasted entirely too much time on the internet trying to nail down what I want to do here.

    I was given an old medical touchscreen all in one type computer. The computer bits are mostly junk, like 10 years old. The LCD panel seems to be nice though and the touchscreen is a 15" Elo Intelitouch SAW panel, and supports multi-touch in windows 7. I want to see what I can do with this with minimal cost (don't mind putting effort into it though), perhaps a mediacenter hub or something cool.

    The problem is the motherboard to controller connector is something I am unfamiliar with. What I've learned so far is that it's probably SCSi using LVDS? I know my epia mII10k supports lvds, but I pretty much know nothing else about it. What I'd ultimately like to do is use an additional controller to allow an incoming VGA or DVI signal to work.

    So what I believe I need to do:
    -find controller card to convert lvds to vga or dvi
    -hack together some kind of cable to convert 50 pin SCSI used already to whatever the above controller accepts

    Correct? If there is an easier way to do this or anybody knows of exact parts I can use that would be amazingly cool. I've emailed Quadrangle, as they seem to be a name used on here frequently... haven't heard back.


    Relevant Part numbers

    LCD: NEC NL10276AC30-07 spec sheet...http://www.google.com/url?sa=t&sourc...HLlPxcEFFFeh5g

    Controller: doesn't say much, but does have

    Hannstar MV-1
    94v-0
    0240
    0500538-0001C

    Images...




  2. #2
    Variable Bitrate
    Join Date
    Apr 2004
    Posts
    409
    The panel itself is TTL, I have no idea what the existing controller is without a data sheet so unless you can find a data sheet for the existing controller it's probably best just to replace it with something else. What you need a 24x2 bit 1024x768 5 volt TTL controller (sometimes called 24 bit double pixel, 48 bit, 8bit 2 port). I work with these panels all the time retrofitting old industrial controls. What sucks is the terminology for TTL LCD signal exchange isn't very standardized. Making the cable to connect this all together is a PIA but it can be done.

    They call it 8 bit on the data sheet you linked to, but that's 8 bits for each of the 3 primary colors 3x8=24. On top of that it's 2 wires (A and B) for each bit making 48 wires just for the color data, plus connections for ground, power, data enable, dot clock, then the backlight inverter power and inverter control signal.

    Try to keep the cable length from the controller to the panel as short as possible. If the cable gets to be more than a few inches long it helps to use shielded cable for the dot clock. I wouldn't go much more than 10-12 inches total cable length. The inverter cable length isn't that critical.

    This controller specifically the ARV-1575 will probably work. 5 volt TTL is what you have. The specs on this controller say it will work with an NEC_NL10276BC30-15 which most likely has the exact same pinout but might be a different version with a different coating on the screen or different backlight. They may even have a cable available. It seems the ARV-1573 is only VGA input, you may be able to find one with a DVI input, just look for 5 volt, TTL, 24x2 bit. Some motherboards also have TTL capability.

    If you get the data sheet for the controller, email it to me and I can tell you if it will work and how to hook it up- turbochris at krugtech dot com

    Have you figured out the touchscreen hookup?

  3. #3
    Constant Bitrate
    Join Date
    Jun 2005
    Location
    MD, USA
    Posts
    129
    Thanks a bunch for that response man, really helps me out. Shed light on all of the things I was iffy about at least starting off. I'm going to try and email Braemac to figure out pricing on that controller, can't seem to find it or any dealers anywhere on their site. I also don't need DVI just weighing my options.

    One question, how can I tell the difference between TTL and LVDS given say, the controller sheet for my lcd panel? Is there a giveaway phrase or spec somewhere in there? Depending on the pricing for the cable, I may try to make my own. I know it won't be much relative to the controller, but I'm pretty confident when it comes to that kind of stuff(have a little experience with small scale crimp connectors) and I like doing that kind of thing.

    For the touchscreen, it should be pretty straight-forward and I'm hoping I can sort it out. I have part numbers for the controller 351077-000 and panel 533563, and from what I've read it seems like they should be supported through windows 7 with the new drivers. I've hooked up the serial port to two different com ports on one computer and one on another though, and I see no recognition with or without drivers installed. It works perfectly with the old windows 2000 setup I plan to get rid of. Thought it was a serial cable problem at first but replacing it didn't help, and the diagnostic led on the controller is working fine until the panel is touched and it tries to send a signal to the comp.

    One thing, the panels were updated to support RoHS compliancy but I really don't think that would have an impact on drivers.

    Also, I haven't really tried all that hard to get the touch working yet. I've pretty much just installed some drivers and hooked it up a couple times. I'm going to first try it back on the win2000 machine now that it's out of the enclosure and then work my way from there. Maybe use a usb to serial converter to see if that sparks anything new.

  4. #4
    Variable Bitrate
    Join Date
    Apr 2004
    Posts
    409
    I don't get to help out here much but this LCD stuff is something I've had to learn and I'm happy to be able to help. I spend most of my time here asking dumbass questions about RoadRunner.

    Telling the difference between TTL and LVDS- TTL has way more wires for a given color resolution. A low color resolution panel may only have 12 wires for the color signal all the way up to something like your panel with 48 wires. TTL is becoming obsolete, I'm in the process of deciphering all the different signals for LVDS and just like TTL, the terminology and designations they use to describe the signal exchange is far from standardized.

    On the touch screen- are you using the correct com port? Some of the older stuff will only work on ports 1 through 4

    Chris

  5. #5
    Constant Bitrate
    Join Date
    Jun 2005
    Location
    MD, USA
    Posts
    129
    Maybe that is the problem, no clue. I always thought that serial com ports occupied the first com port numbers and then other things fell in line behind.

    I did get it working though using a serial-usb cable I had bouncing around. Pretty sweet, now I need to get on this lcd and actually figuring out what I'm going to use it for.

  6. #6
    Constant Bitrate
    Join Date
    Jun 2005
    Location
    MD, USA
    Posts
    129
    Did a little more research, it seems like this would also be a good option.

    http://www.digitalview.com/products/...lcd-controller

    Seems pricey at ~140(mouser and elsewhere), but I really don't know how much this stuff is supposed to cost. Plus, they have cables somewhere that I could at least base mine off of and that have plugs for the controller. For the NL10276BC30-15, it looks as if NEC decided to go ahead and change one letter and make the thing LVDS.

    What would you say the likely-hood is of picking up a 15" NEC monitor with the same resolution and having the controller inside work for what I want? I'm seeing some interesting options on ebay with both dvi and vga inputs that are TTL. I'm trying to find actual panel information on these things but it's proving to be difficult.

    Also, "Far from standardized".... You weren't kidding.

  7. #7
    Variable Bitrate
    Join Date
    Apr 2004
    Posts
    409
    Connector CN2 and CN3 on the controller you linked to have all the connections you need for your panel. CNB1 would connect to the inverter. Here's a good example of the non standard terminology. They call the A and B channels O and E. Connect your 48 color data lines, dot clock, enable, power and ground and your panel will work. The inverter hookup is pretty straight forward.

    You have to be careful when trying to scavenge a controller from another panel. You may find a panel that uses a controller that could work, but then find the controller PCB isn't fully populated. They'll put just enough parts on the board to get the controller to work with the panel it's packaged with. They'll leave out any dipswitch banks used to select the different panels and hard code everything in a stripped down bios for that specific panel.

    Maybe you could buy a complete similar sized monitor and adapt your touchscreen to it?
    Chris Krug
    owner, turbine minivan
    http://www.youtube.com/krugtech

Similar Threads

  1. 1994 Peugeot 106 XS beeing upgraded just a bit
    By boelle in forum Show off your project
    Replies: 20
    Last Post: 10-16-2010, 01:41 PM
  2. arebelspy's For Sale/For Trade Thread
    By arebelspy in forum Classified Archive
    Replies: 104
    Last Post: 03-18-2006, 11:02 PM
  3. Big Sale: Smartphone, Lilliput 8", Opus 150w, etc.
    By arebelspy in forum Classified Archive
    Replies: 33
    Last Post: 12-02-2005, 11:20 PM
  4. Replies: 22
    Last Post: 01-05-2005, 12:47 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •