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    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    RP4B 2GB | HDMI to Samsung 4K TV not detected

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    • AddisonA
      Addison
      last edited by

      Unplug the HDMI cable from the Pi and plug it into the other HDMI output on your Pi.

      See if that works.

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      • mituM
        mitu Global Moderator
        last edited by

        Limit the resolution to 1080p - see https://retropie.org.uk/docs/Pi4/#issues-using-a-4k-tv - and make sure you're powering on the Pi after the TV is on.

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        • O
          oswyevega @mitu
          last edited by

          @mitu Thanks for your response, still not working, it is working on the monitor but not the TV.

          I added these settings as suggested and turned on the TV and set the source on HDMI 3, before power on the RB

          hdmi_group=1
          hdmi_mode=16
          hdmi_max_pixel_freq:0=200000000
          hdmi_max_pixel_freq:1=200000000
          gpu_mem=320M
          

          This is the original set of configs in the config.txt

          dtparam=audio=on
          camera_auto_detect=1
          display_auto_detect=1
          dtoverlay=vc4-kms-v3d
          max_framebuffers=2
          disable_overscan=1
          otg_mode=1
          arm_boost=1
          
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          • O
            oswyevega @Addison
            last edited by

            @addison Not working. I'm using the closest port to the power supply port, but also tested in the other port, and it didn't work.

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            • mituM
              mitu Global Moderator
              last edited by

              Are you even using RetroPie ? Looks like you're using the newer Raspi OS (11), which is not yet supported by RetroPie.

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                oswyevega @mitu
                last edited by

                @mitu I switch the OS to test if it was a Retropie issue. I will install the OS again and test with these settings. Let you know if it works. Thanks again for your support!

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                • O
                  oswyevega @mitu
                  last edited by

                  @mitu I installed Retropie 4.7.1 from Raspberry Pi Imager. This is my current config.txt settings:

                  # uncomment if hdmi display is not detected and composite is being output
                  hdmi_force_hotplug=1
                  
                  # uncomment to force a specific HDMI mode (this will force VGA)
                  hdmi_group=1
                  hdmi_mode=16
                  gpu_mem=320M
                  hdmi_max_pixel_freq:0=200000000
                  hdmi_max_pixel_freq:1=200000000
                  
                  # Enable audio (loads snd_bcm2835)
                  dtparam=audio=on
                  
                  [pi4]
                  # Enable DRM VC4 V3D driver on top of the dispmanx display stack
                  dtoverlay=vc4-fkms-v3d
                  max_framebuffers=2
                  
                  [all]
                  #dtoverlay=vc4-fkms-v3d
                  overscan_scale=1
                  

                  Again, working on my monitor but not on my TV. I turned on my tv first, and then power on the raspberry. Any advice ?

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                  • mituM
                    mitu Global Moderator
                    last edited by

                    You should remove the gpu_mem setting, it's no use on a Pi4. Also, you've set the resolution explicitly, there's no need to add the other configurations (hdmi_max_pixel_freq).

                    Does your TV support 1080p ? If you run tvservice -m CEA, what's the output ? You can run the command via SSH and copy the output.

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                      oswyevega @mitu
                      last edited by

                      @mitu

                      pi@retropie:~ $ tvservice -m CEA
                      Group CEA has 4 modes:
                                 mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive 
                        (prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive 
                                 mode 95: 3840x2160 @ 30Hz 16:9, clock:297MHz progressive 
                                 mode 97: 3840x2160 @ 60Hz 16:9, clock:594MHz progressive 
                      

                      Current config.txt

                      # uncomment if hdmi display is not detected and composite is being output
                      hdmi_force_hotplug=1
                      
                      # uncomment to force a specific HDMI mode (this will force VGA)
                      hdmi_group=1
                      hdmi_mode=16
                      
                      # Enable audio (loads snd_bcm2835)
                      dtparam=audio=on
                      
                      [pi4]
                      # Enable DRM VC4 V3D driver on top of the dispmanx display stack
                      dtoverlay=vc4-fkms-v3d
                      max_framebuffers=2
                      
                      [all]
                      #dtoverlay=vc4-fkms-v3d
                      overscan_scale=1
                      
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                      • mituM
                        mitu Global Moderator
                        last edited by

                        Though the list of supported modes is a bit short, 1080p seems supported. Other than double checking the cable, no idea at this time.

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                          oswyevega @mitu
                          last edited by

                          @mitu Thank you again for the support. Yeah, is a mystery to me as well since I got it working the first day with Steam Link and everything looked good. So don't know what changed from day one to day 2.

                          I'll review the HDMI cable and the power supply. Maybe that is the issue.

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                          • busywaitB
                            busywait @oswyevega
                            last edited by

                            @oswyevega
                            Try putting this overclock line in to /boot/config.txt

                            core_freq=650
                            

                            It overclocks the "GPU", the core that is involved in putting data onto the HDMI cable. That change fixed a blank screen on my 4K PC monitor after I switched to the new (bullseye) Raspberry Pi OS.

                            Even without that change the blank screen went away when I used the official Raspberry Pi monitor cable - probably the best solution :)

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                            • O
                              oswyevega @busywait
                              last edited by

                              @busywait I'll try this one and let you know the results! I also ordered the official HDMI cable and the official power supply, from Amazon, just to make sure!

                              Thanks for the advice! :)

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