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    Raspberry pi 4 no hdmi output after a while

    Troubleshooting
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    • B
      Blauenfeldt last edited by

      So today after messing around with MMPM and GoogleAssistant, my monitor turned went blank, and the “no connection” appeared, and went to display the next active input.
      I use the HDMI input 1 with my Stationary PC and HDMI input with my Pi 4.
      Tried to switch back to my Pi, but got the “no connection”.
      I have tried switching HDMI inputs, but the hdmi from my Pi still show no connection. HDMI from my pc works fine.
      I then tried to connect via VNC, and had no problem. The “Screen configuration” still says 1920x1080 @ 60HZ, so no nothing weird there.
      I tried the tvservice -scommand and got this

      pi@MagicMirror:~ $ tvservice -s
      state 0xa [HDMI CUSTOM RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
      

      I don’t know what to do with that info, but hopes it helps. I have tried to google a little around, but didn’t find any definitive solution, that didn’t involve something I couldn’t see how it would help.
      I have seen some talk about the power supply. But I don’t think I have that issue, as I use an 3 amp power supply from TT Electronics.
      This problem also happens, if I use my Pi 4 on my 4k tv.

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      • S
        sdetweil @Blauenfeldt last edited by

        @Blauenfeldt have u powered off your pi, and back on.

        I suspect you caused the HDMI port to be turned off. tvservice -o or the vgencmd

        I know there have been folks reporting that things that worked fine on pi3, won’t power back on on Pi4.

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        • ?
          A Former User last edited by

          try to tunning /boot/config.txt in sudo mode.
          you can boost HDMI signal and force it at boot

          some command in terminal for RPI:

          • vcgencmd display_power

          results:

          1. display_power=0 -> screen off
          2. display_power=1 -> screen on
          • vcgencmd display_power 1
            -> force screen on

          • vcgencmd display_power 0
            -> force screen off

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