Graham Morby-Raybould

Designer. Developer. Freelancer.

Raspberry Pi HDMI issues


Raspberry Pi HDMI issues

So I have started to investigate my Raspberry Pi which has been sat in the drawer for over a year now! I intend to have a full play around with the OS and see what I can achieve on it.  However, I have hit the first issue and it's what this article is all about, hopefully many of you will find this helpful.  So I downloaded Raspbian OS and copied it over to my SD card, plugged it all in and boom no display. My HDMI was not outputting. 

So here is the fix:

If you open up your config.txt you will be looking at something like this:

# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details
 
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
 
# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1
 
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
 
# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
 
# 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=1
 
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
 
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
 
# uncomment for composite PAL
#sdtv_mode=2
 
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

Ok so there are three bits of code we need to uncomment to get the Pi to force the power to HDMI and in turn output graphics.

So find these three items and remove the hash tag to make it look like this:

# uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
config_hdmi_boost=4

And Bob's your Uncle! Pop your SD card into your PI and off you go!


Created: 2017-11-14.


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