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Diagnosing Raspberry Pi HDMI signal communication problems

quorten

2018-07-30

Categories: raspberry-pi   important  
Tags: raspberry-pi   important  

Important!

Having trouble with HDMI displaying from your Raspberry Pi on your old HDMI TV?

  • The Pi outputs a relatively weak HDMI signal. Some devices may not immediately notice the Pi’s HDMI or may not do the negotiation.

  • Set hdmi_force_hotplug=1 makes sure the Pi believes the monitor/TV is really there.

  • config_hdmi_boost=4 or higher, up to 9, if your display needs a stronger signal. Alternatively, use a shorter HDMI cable if possible.

  • If the display is a computer monitor, use hdmi_group=1 and if it is an older TV, try hdmi_group=2.

  • Do not set hdmi_safe=1 as that overrides many of the previous options.

  • Make sure your Pi’s power supply delivers 1A and not 500mA.

  • If you see a problem with the red colour - either absent, or interference - then try a boost. However it might simply be that the display requires a stronger signal than the Pi can give.

  • See the embedded Linux Raspberry Pi troubleshooting guide.

  • Try setting hdmi_drive=2 if you are still having trouble connecting to your TV.

20180729/DuckDuckGo raspberry pi hdmi not recognized old tv
20180729/https://www.raspberrypi.org/forums/viewtopic.php?t=34061
20180729/https://elinux.org/R-Pi_Troubleshooting#No_HDMI_output_at_all
20180729/http://blog.mivia.dk/solved-hdmi-working-raspberry-pi/