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Mac Pro Late 2013 A1481 ISSUE

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    #1

    Mac Pro Late 2013 A1481 ISSUE

    So the computer works minus a flaw with the HDMI port. LCDs get detected but they won't display. I plug the LCDS into the Thunderbolt port no issue. HDMI port doesn't seem to display. So I plugged in multiple monitors and used the HDMI port and it detects the display but won't give an image. One time it gave a grainy colorful distorted image which makes me wonder if it's a bad HDMI port or Gpu Board? Anyone have any ideas? I am leaning towards a Bad hdmi, or bad D300 GPU or maybe the top logic board? I have never seen this issue before and would like to fix it. Any suggestions would help. I believe I have to replace the board that's faulty but would like to not waste time pin pointing the issue
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    #2
    Re: Mac Pro Late 2013 A1481 ISSUE

    Let me rephrase this. Using multiple Thunderbolt ports all LCDS will display with multiple connected but when I try the HDMI it never works. It detects the display but won’t display an image. So I have two Thunderbolt to hdmi plugged in and fine. When I try the HDMI port nothing.
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      #3
      Re: Mac Pro Late 2013 A1481 ISSUE

      Any idea?
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        #4
        Re: Mac Pro Late 2013 A1481 ISSUE

        Originally posted by Stephen View Post
        Any idea?
        have you checked all the hdmi pins aren`t broken or loose on the pcb. have you taken any resistance measurements
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          #5
          Re: Mac Pro Late 2013 A1481 ISSUE

          Checked the pins and they are all in tact but I can take a look under the microscope. You don’t think it’s one of the GPUS? Because these are dual AMD D300 GPUs.
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            #6
            Re: Mac Pro Late 2013 A1481 ISSUE

            Originally posted by Stephen View Post
            Checked the pins and they are all in tact but I can take a look under the microscope. You don't think it's one of the GPUS? Because these are dual AMD D300 GPUs.
            No idea sorry.
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              #7
              Re: Mac Pro Late 2013 A1481 ISSUE

              Ordered two boards I’ll let you know so we can update the forum with this issue if it arises again.
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                #8
                Re: Mac Pro Late 2013 A1481 ISSUE

                Swapped out HDMI IO board solved the issue. I believed it was this but hoped it wasn’t but it was. It has no bent pins yet sadly wasn’t working. Thanks ����
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