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  • Dynamix LCD "no input signal"

    Hello all.

    I'm experiencing some difficulty with my car lcd monitor after I replaced my old mobo with a new one.

    This is the situation:

    The LCD works fine with old mobo and with notebook too but says "no input signal" when connected to the new mobo;
    The new mobo works well with my 22" home lcd monitor and tested succesfully also with a 17" CRT monitor;

    So, the car lcd monitor seems to be OK and the new mobo also seems to be OK but... I'm unable to have these items working well together

    Moreover the lcd turns off when no signal is detected.

    Maybe the new mobo have a little vga signal so that the lcd in car can't detect it correctly; or maybe the car's lcd monitor have a high vga signal threshold so that is unable to detect the vga signal from the new mobo... Really don't know!

    Is there some way to get rid of this annoying message from the lcd? Is there some way to deactivate, even if in hardware, the detection of vga signal so that the lcd stay on regardless of vga signal?
    Alternatively, there's some way to "amplify" the output signal from the motherboard so that the lcd monitor can detect the signal correctly and stay on? Is there a way to know exactly which signal (and correspondant pin on vga connector) is tested by the monitor to decide if "no vga signal" or to turn on and display what is receiving?

    Many thanks in advance to all for the help and for any advice!
    My new dash setup with 8.4" LCD!
    Secondary (roof) LCD display
    False floor with mobo, amp and all the electronics
    Power supply and HDD Suspension system detail

  • #2
    Firstly, what are the parameters of the drive of the new mobo?
    Resolution, frequency, color depth, refresh rate, etc.
    You can make it display on the screen from the menu.

    So, the old mobo was able to display pictures on the car monitor.
    Please attach another LCD monitor to the old mobo and ask about the same signal parameters as mentioned.

    Compare them.

    Identical: you have right, there is something wrong about the signal. You need some electronics.
    Non-Identical: I have right and there is something about the settings of the display, you just need to set the parameters.
    Alopecia perniciosa

    Comment


    • #3
      it just sounds like the output of the new mobo is a resolution the screen cant handle, plug in your new mobo to a monitor that works, set the resolution really low, like 800x600 (lower if you can). re-attach it and see what happens

      ali 2k

      Comment


      • #4
        Unfortunately I sold the old mobo some time ago so I can't compare the old mobo vga setting with the new one.

        Anyway, the car's lcd monitor (dynamix) works correctly with the vga output of my notebook and I can correctly expand my notebook desktop on the dynamix monitor. Can you please suggest me on where I can see the parameters are you mentioning?

        I have just made some other test today connecting my crt monitor to the new mobo; I entered the bios and tried some random editing on "video function configuration". On every change I saved and rebooted and the crt always worked with apparently no changes in displaying the image; then I've connected the dynamix getting always the same boring message "no vga signal"

        I've found a lot of settings in the bios, mostly unknown to me. FYI here's the group I've wrote down:

        - boots graphic adapter priority {IGD, PEG/IGD, PEG/PCI, PCI/PEG, PCI/IGD}
        - internal graphic mode select {DISABLED, ENABLED 1MB, ENABLED 8MB}
        - aperture size select {128MB, 256MB}
        - video function configuration
        -- DVMT mode select {Fixed, DVMT, combo}
        -- Boot display device {AUTO, CRT, TV, LVDS, CRT & LVDS}
        -- Flat panel type {640x480 LVDS, 800x600 LVDS, 1024x768 LVDS, 1280x1024 LVDS, 1400x1050 LVDS, 1400x1050 REDUCED LVDS, 1400x1050 NON REDUCED, 1600x1200 LVDS}
        -- Local flat panel scaling {AUTO, FORCED, DISABLED}

        As I said, I've already tried vorious combination with no result; crt monitor always works good but dynamic lcd always stays on "no vga signal" message.

        I hope you can help me to solve this issue!

        P.S. You can see the dynamix monitor I own here: http://cgi.ebay.com/Dynamix-WideScre...QQcmdZViewItem
        My new dash setup with 8.4" LCD!
        Secondary (roof) LCD display
        False floor with mobo, amp and all the electronics
        Power supply and HDD Suspension system detail

        Comment


        • #5
          These BIOS settings are not affecting VGA signals.

          Double right click on desktop. Properties/ settings/ resolution or color depth

          It does not give any symptom of life during POST? Try it. Connect the car lcd before powering on.
          Alopecia perniciosa

          Comment


          • #6
            No symptom of life during POST nor during OS loading. With the dynamix I'm totally unable to see anything. As already said it works well with my notebook VGA output, and it worked good for months with my old mobo (with integrated graphics too).
            I'm suspecting it's a intel drivers problem.
            Today I've connected the mobo to my 22" lcd home monitor and noticed that there's no problem during post and OS loading; I can see the image as expected. When the OS is loaded then the image disappear and my 22" goes to standby; really strange behaviour!
            Mobo works without issues with CRT monitor, any resolution/color depth combination.
            Anyway, I've read of someone using xenarc lcd monitor successfully with my identical mobo so, it's clear, it's some kind of incompatibility between vpower mobo (maybe intel 915gm chipset) and dynamix lcd monitor.

            I tried also to install an old free version of powerstrip; it detect correctly bot video chipset and philips crt monitor but when I disconnect CRT, connect dynamics lcd and rescan, it says it's unable to communicate with the monitor

            I'm really frustrated by this situation

            Really, I'm going to change the mobo.... or maybe the lcd??? Moreover it's difficult to find these items here so I always buy from usa (sometimes china) and this complicates all
            My new dash setup with 8.4" LCD!
            Secondary (roof) LCD display
            False floor with mobo, amp and all the electronics
            Power supply and HDD Suspension system detail

            Comment


            • #7
              Well, in this case the root of the problem must be electronical.
              I also think, you have to exchange a component.

              Is there any refresh of the bios? What did the manufacturer of the mobo say?
              Alopecia perniciosa

              Comment


              • #8
                I'm trying to contact the seller idotpc.com. I think it's a video issue of the i915 chipset; in fact it seems to function correctly only with a crt monitor connected. Yesterday tried my 22" pakard bell and today I tried another lcd (21" from fujitsu-siemens) with no success so my suspects now are fully on the mobo integrated video card, the i915GM chipset but I'm unable to solve the problems that I have. Do you have some advice on this?
                My new dash setup with 8.4" LCD!
                Secondary (roof) LCD display
                False floor with mobo, amp and all the electronics
                Power supply and HDD Suspension system detail

                Comment


                • #9
                  Unfortunately, not. I think you have to wait for the result of the contact with manufacturer...
                  Alopecia perniciosa

                  Comment


                  • #10
                    I'll wait. Thanks a lot for your help
                    My new dash setup with 8.4" LCD!
                    Secondary (roof) LCD display
                    False floor with mobo, amp and all the electronics
                    Power supply and HDD Suspension system detail

                    Comment


                    • #11
                      This post just to update the thread.

                      I'm still waiting for a response from the mobo seller and today I tried to contact intel to ask for assistance. I'm pretty sure it's a video chipset issue but I can't handle it. Today I tried to put and old S3 based video card on the pci slot, then connected the dynamix lcd to its vga output... Turned on the pc and magically had the dynamix working good.

                      This test finally convinced me that the integrated video has something wrong as it's unable to get the dynamix lcd working. What kind of problem it can have? I really don't know, so any suggestion is welcome. Tried to install powerstrip also but don't know if it's useful and how.

                      The install of an external pci video card can solve my problems but only if exists a pci video card with same (or superior) features as the integrated GMA, possibly with lower profile due to the poor space available. Any advice on this is also appreciated :-)
                      My new dash setup with 8.4" LCD!
                      Secondary (roof) LCD display
                      False floor with mobo, amp and all the electronics
                      Power supply and HDD Suspension system detail

                      Comment


                      • #12
                        I missed the bit where you said what the mobo is. I looked up the mobo in your carpc specs under your name on the left (j7f2we1g2e), but that doesn't have an i915 chipset. I looked up the two links in your sig but all I got was some pictures.

                        If your mobo kicked out low voltage sync (3.3v instead of 5v) then the monitor may have trouble detecting that. I think I remember that some motherboards do this, and some monitors have trouble with low level sync. Not knowing which mobo you have and having a hazy memory about the specifics of the problematic system in the past definately doesn't help things here.
                        Old Systems retired due to new car
                        New system at design/prototype stage on BeagleBoard.

                        Comment


                        • #13
                          Originally posted by Rob Withey View Post
                          I missed the bit where you said what the mobo is. I looked up the mobo in your carpc specs under your name on the left (j7f2we1g2e), but that doesn't have an i915 chipset. I looked up the two links in your sig but all I got was some pictures.

                          If your mobo kicked out low voltage sync (3.3v instead of 5v) then the monitor may have trouble detecting that. I think I remember that some motherboards do this, and some monitors have trouble with low level sync. Not knowing which mobo you have and having a hazy memory about the specifics of the problematic system in the past definately doesn't help things here.

                          Sorry, still not updated my car specs. The mobo is the one you can see here:

                          http://www.idotpc.com/TheStore/pc/vi...&idproduct=425

                          How can I check the voltage sync?
                          My new dash setup with 8.4" LCD!
                          Secondary (roof) LCD display
                          False floor with mobo, amp and all the electronics
                          Power supply and HDD Suspension system detail

                          Comment


                          • #14
                            Possibly useful threads:

                            http://www.mp3car.com/vbulletin/lcd-...3-3v-sync.html
                            http://www.mp3car.com/vbulletin/gene...3-3v-sync.html

                            For other info, search for "3.3 sync".

                            Mod basically uses TTL to buffer (and amplify) sync signal from 3.3v to 5v.
                            Old Systems retired due to new car
                            New system at design/prototype stage on BeagleBoard.

                            Comment


                            • #15
                              Originally posted by l1nk View Post
                              How can I check the voltage sync?
                              Connect it to an oscilloscope.
                              Old Systems retired due to new car
                              New system at design/prototype stage on BeagleBoard.

                              Comment

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