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    Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

    Hi guys
    I have this Gigabyte GA-N650SLI-DS4

    It does not have onboard SVGA

    With no graphics card fitted it beeps as you would expect then continues to boot (According to the POST test card) to 7F

    If I put a graphics card in the PCIe slot nearest the CPU it gets into a loop up to C1, repeats several times, then goes to C3


    If i put a graphics card in the other PCIe it beeps to say there is no graphics card, then hangs for a while and eventually boots to FF

    I thought there may be some problem with the North Bridge but then I spotted this QFP near the PCI slots that looks somewhat distressed

    It's a TSB43AB23 which is readily available on aliexpress for a couple of euros. The datasheet says it transfers data from the 33MHz PCI to IEEE1394
    http://www.ti.com/product/TSB43AB23


    So obviously I need to replace that. I wonder if it is actually causing all the problems with the PCIe slots as well, I thought PCIe was North Bridge bus and PCI was south bridge? but I will happily believe this could cause problems on the other bus. Also what would cause it to burn out? Someone connect something wrong like a USB to the 1394 header? There is some corrosion on two pins of the 1394 connector as well, maybe something got inside here?

    OK so anything else worth checking first or just order a chip?
    Attached Files
    Last edited by dicky96; 02-21-2020, 06:29 AM.
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    #2
    Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

    I ordered the TSB45AB23 it will be interesting to see if it fixes this motherboard
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      #3
      Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

      These SLI boards usually have a bridge card (that empty slot between the blue PCI-E and PCI slots) and will exhibit these issues without them.

      Oh, and that TSB45AB23 is just the 1394/FireWire chip.
      Main rig:
      Gigabyte B75M-D3H
      Core i5-3470 3.60GHz
      Gigabyte Geforce GTX650 1GB GDDR5
      16GB DDR3-1600
      Samsung SH-224AB DVD-RW
      FSP Bluestorm II 500W (recapped)
      120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
      Delux MG760 case

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        #4
        Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

        Originally posted by Dan81 View Post
        These SLI boards usually have a bridge card (that empty slot between the blue PCI-E and PCI slots) and will exhibit these issues without them.

        Oh, and that TSB45AB23 is just the 1394/FireWire chip.

        Good job.

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          #5
          Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

          Originally posted by Dan81 View Post
          These SLI boards usually have a bridge card (that empty slot between the blue PCI-E and PCI slots) and will exhibit these issues without them.
          +10

          You need that bridge card to get a video card working (whether in SLI or single mode), as Dan suggested.

          As for the TSB45AB23 Firewire chip... you can just remove it for now, and the board should still POST without it.

          Finally, I suggest adding a fan on the NB heatsink. nVidia nForce chips are known to run hot *and* go bad over time when they do that due to bumpgate issue. So try to keep that NB as cool as possible.

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            #6
            Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

            Originally posted by Dan81 View Post
            These SLI boards usually have a bridge card (that empty slot between the blue PCI-E and PCI slots) and will exhibit these issues without them.

            Oh, and that TSB45AB23 is just the 1394/FireWire chip.
            Oh wow. This is a perfect example of why I love this forum! The knowledge and help here is the best on the 'net IMHO

            I'll go order one.



            hmmmm.. does that bridge card thingy have a specific name i can google?
            Last edited by dicky96; 02-26-2020, 04:48 PM.
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              #7
              Re: Gigabyte GA-N650SLI-DS4 motherboard not detecting PCI-e graphics card

              I found it in the manual. Should have looked there before

              The pic of the one in the manual says GC-SLISW-C55

              But the only used ones I can find seem to be this type
              https://www.ebay.es/itm/Gigabyte-Gc-...0AAOSwmaJcMWMl

              which looks similar on the pics but may not be the same.
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