LVDS board not working with Mitsubishi LCD

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  • pcardoso73
    Member
    • May 2020
    • 40
    • United Kingdom

    #1

    LVDS board not working with Mitsubishi LCD

    Hi,
    I have two identical LCD displays from Mitsubishi/OPTREX, reference AA084XB01 and I've bought off ebay an LVDS board for it.

    Connecting the board to either display gives me vertical coloured stripes.
    The seller sent me another board and the same happens.
    I am thinking that either the wrong firmware was used or the pinout is, somehow, wrong and the cables are wrongly connected.
    Please take a look at the pictures attached.

    Thanks in advance.
    Best regards,
    Pedro
    Attached Files
  • Diah
    Badcaps Legend
    • Feb 2013
    • 6341
    • Germany

    #2
    Re: LVDS board not working with Mitsubishi LCD

    i think its pin out order.. before when i ordered LVDS AV driver boards i did ordered the panel with it to avoid any trouble later if i going to work on other panel or when testing drivers.

    BTW there are DIY PCB for LVDS to work around of the pins order.. i think you need one now or at future too
    Last edited by Diah; 07-22-2020, 09:20 AM.

    Comment

    • pcardoso73
      Member
      • May 2020
      • 40
      • United Kingdom

      #3
      Re: LVDS board not working with Mitsubishi LCD

      Originally posted by Diah
      BTW there are DIY PCB for LVDS to work around of the pins order.. i think you need one now or at future too
      Thank you for your answer.
      But do I really need an extra PCB, or just to swap the pins in the molex connector to the correct position?

      I have the datasheet of the LCD, but I don't know the pinout in the board. Do you know if I can get this information easily?
      Cheers,
      Pedro

      Comment

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #4
        Re: LVDS board not working with Mitsubishi LCD

        If you have the original LCD display can you use your meter to check how it is wired.
        Willing to help but I'm no expert.

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6341
          • Germany

          #5
          Re: LVDS board not working with Mitsubishi LCD

          Originally posted by pcardoso73
          Thank you for your answer.
          But do I really need an extra PCB, or just to swap the pins in the molex connector to the correct position?

          I have the datasheet of the LCD, but I don't know the pinout in the board. Do you know if I can get this information easily?
          Cheers,
          Pedro
          i recommend the PCB just for further future use of the LVDS AV boards.. and easy to swap.

          let see yours LCD pin data.. the boards are easily to know them and put them in order after you determine the VCC and G. the other gate signal will be in one line such p1+ p1- p2+ P- P3... and so on. ( this explanation based on OLED Panel Not LCD with BL )

          Comment

          • pcardoso73
            Member
            • May 2020
            • 40
            • United Kingdom

            #6
            Re: LVDS board not working with Mitsubishi LCD

            Hi,
            Today I've taken a look at the datasheets of, both, the LCD panel and the controller board.
            Attached, you will find screenshots of the pinout for both devices (LCD and controller), taken from each datasheet.

            I've noticed that the cable which connects to the LVDS on the panel side, doesn't have two pins connected, which should be ground. Is that important, maybe not, since there are other pins which are ground.

            I have one doubt regarding the contoller's datasheet. What does it mean ODD and EVEN in each LVDS link - and +?
            Cheers,
            Pedro
            Attached Files

            Comment

            • pcardoso73
              Member
              • May 2020
              • 40
              • United Kingdom

              #7
              Re: LVDS board not working with Mitsubishi LCD

              Originally posted by Diah
              i recommend the PCB just for further future use of the LVDS AV boards.. and easy to swap.

              let see yours LCD pin data.. the boards are easily to know them and put them in order after you determine the VCC and G. the other gate signal will be in one line such p1+ p1- p2+ P- P3... and so on. ( this explanation based on OLED Panel Not LCD with BL )
              Hi,
              Can you, please, point me to a link for the PCB?
              Best regards,
              Pedro

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: LVDS board not working with Mitsubishi LCD

                Please read this:
                https://sites.google.com/site/lcd4hobby/lvds-cables
                Also watch this:
                https://www.youtube.com/watch?v=jiCeiB3HVhA

                Your LCD panel is only single channel.
                BTW, please provide the full PDF spec of your controller board and the LCD panel.
                It is also important to verify VCC pins and Ground pins before trying to power up the board and panel.
                .
                Last edited by budm; 07-25-2020, 07:11 PM.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6341
                  • Germany

                  #9
                  Re: LVDS board not working with Mitsubishi LCD

                  Originally posted by pcardoso73
                  Hi,
                  Can you, please, point me to a link for the PCB?
                  Best regards,
                  Pedro
                  Just for example.. as there are many kinds it depend on where and how to use them

                  BTW. from all the data you upload over here.. no one of them talked about MHz of LVDS DCLK.

                  one things more to use one channel display with Dual channel LVDS AV driver boards required almost cases changing / workaround with firmware.

                  Comment

                  • pcardoso73
                    Member
                    • May 2020
                    • 40
                    • United Kingdom

                    #10
                    Re: LVDS board not working with Mitsubishi LCD

                    I have been through both datasheets and tested the connections with a multimeter.

                    Everything seems to be correctly wired except for 2 pins, which should be GND/VSS but they are not connected. Actually, the pins don't exist in the connectors on both sides.

                    Please check the datasheets attached to this post. Maybe I have missed something.
                    Pedro
                    Attached Files

                    Comment

                    • Diah
                      Badcaps Legend
                      • Feb 2013
                      • 6341
                      • Germany

                      #11
                      Re: LVDS board not working with Mitsubishi LCD

                      Originally posted by pcardoso73
                      Everything seems to be correctly wired except for 2 pins, which should be GND/VSS but they are not connected. Actually, the pins don't exist in the connectors on both sides.

                      Please check the datasheets attached to this post. Maybe I have missed something.
                      Pedro
                      what are you talking about ?? if you follow the data sheet of both yours Panel can be connected to ODD pins..

                      don't use EVEN

                      Comment

                      • pcardoso73
                        Member
                        • May 2020
                        • 40
                        • United Kingdom

                        #12
                        Re: LVDS board not working with Mitsubishi LCD

                        Originally posted by Diah
                        what are you talking about ?? if you follow the data sheet of both yours Panel can be connected to ODD pins..

                        don't use EVEN
                        What I was referring to can be seen on the picture attached. There are 2 pins missing in the connector and those pins are ground on the LCD side.

                        I am using ODD pinout, but still no working. I cannot see what can be wrong from the wiring point of view. :-(

                        Pedro
                        Attached Files
                        Last edited by pcardoso73; 07-26-2020, 03:59 PM.

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6341
                          • Germany

                          #13
                          Re: LVDS board not working with Mitsubishi LCD

                          pins 7 / 19 / 20 no need
                          if the firmware match the lcd should display

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: LVDS board not working with Mitsubishi LCD

                            I look at the manual of your board, I do not see how you set the output Voltage to 3.3V to run the T-CON board of your LCD panel. How did you set it to 3.3V?
                            What do you have on pin 1 and 2 on the LVDS connector of your LCD panel?
                            See page 3 of board manual.
                            Last edited by budm; 07-26-2020, 06:08 PM.
                            Never stop learning
                            Basic LCD TV and Monitor troubleshooting guides.
                            http://www.badcaps.net/forum/showthr...956#post305956

                            Voltage Regulator (LDO) testing:
                            http://www.badcaps.net/forum/showthr...999#post300999

                            Inverter testing using old CFL:
                            http://www.badcaps.net/forum/showthr...er+testing+cfl

                            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                            http://s807.photobucket.com/user/budm/library/

                            TV Factory reset codes listing:
                            http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment

                            • pcardoso73
                              Member
                              • May 2020
                              • 40
                              • United Kingdom

                              #15
                              Re: LVDS board not working with Mitsubishi LCD

                              Originally posted by budm
                              I look at the manual of your board, I do not see how you set the output Voltage to 3.3V to run the T-CON board of your LCD panel. How did you set it to 3.3V?
                              What do you have on pin 1 and 2 on the LVDS connector of your LCD panel?
                              See page 3 of board manual.
                              Please check page 7 of the document attached.
                              Pedro
                              Attached Files

                              Comment

                              • pcardoso73
                                Member
                                • May 2020
                                • 40
                                • United Kingdom

                                #16
                                Re: LVDS board not working with Mitsubishi LCD

                                Originally posted by Diah
                                pins 7 / 19 / 20 no need
                                if the firmware match the lcd should display
                                The LCD only displays those vertical stripes shown on my first post.
                                Pedro

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: LVDS board not working with Mitsubishi LCD

                                  Originally posted by pcardoso73
                                  Please check page 7 of the document attached.
                                  Pedro
                                  Ah, the missing document.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6341
                                    • Germany

                                    #18
                                    Re: LVDS board not working with Mitsubishi LCD

                                    Originally posted by pcardoso73
                                    The LCD only displays those vertical stripes shown on my first post.
                                    Pedro
                                    did you tried to inter factory mode to change the lvds mode to auto ?

                                    Comment

                                    • pcardoso73
                                      Member
                                      • May 2020
                                      • 40
                                      • United Kingdom

                                      #19
                                      Re: LVDS board not working with Mitsubishi LCD

                                      Hi,
                                      I have just tested the LCD again.
                                      1. Auto mode - nothing happens (vertical stripes visible)
                                      2. Entering factory mode - nothing happens
                                      3. Voltage in pins 1 and 2 of the lvds connector 3.3V ? - yes
                                      4. Connect computer to the board - computer detects display correctly


                                      When I connect the computer it is recognised with the correct resolution and I can even move the mouse out of my laptop's screen to the external monitor, but I cannot see the mouse pointer due to the stripes.

                                      The manual says that I should use a 12V and 3A power supply. However, I am using a 1A power supply. Nevertheless, for such a small monitor it should be more than enough. This board can be attached to 15'' display, so the 3A should apply to larger displays only.

                                      In summary, the display is detected by the computer, 3.3V are present and no matter what I do only coloured vertical lines are displayed.

                                      Tomorrow, I will put some LEDs in a breadboard to test the LVDS wiring.
                                      Let's see what I can find.

                                      Cheers,
                                      Pedro

                                      Comment

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