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©2021 Sharp NEC Display Solutions, Ltd. Page 62 of 86
• Make sure the display settings for handling the video levels from the Compute Module match
those on the OSD settings of the display. See section 5.3 Configuring the correct HDMI video
level encoding and decoding on page 33 for more details.
Problem: Black borders appear around the screen image
Solution:
• Overscan needs to be disabled. Follow the previous instructions for checking the
“
disable_overscan=1” configuration setting in the config.txt file.
Problem: 3
rd
party IR Remote is not functioning
Solutions:
• Confirm the OSD COMPUTE MODULE setting for IR SIGNAL is set to ENABLE
• Confirm lirc is enabled in the
config.txt file.
• Confirm the software being used is correctly configured for the 3
rd
party IR Remote.
• Use lirc debugging mode to view the raw IR sensor output.
• CEC support may be enabled. Normally CEC support must be disabled in order for lirc to work
correctly.
Problem: Serial communications with the display not functioning
Solutions:
• Confirm the OSD SLOT COMPUTE MODULE ADVANCED SETTING MONITOR CONTROL
setting is set to ENABLE
• Confirm the config.txt file contains the following line:
enable_uart=1
• Confirm the cmdline.txt file doesn’t contain any sections with “console=serial0…..”.
• Confirm no other software is currently accessing the serial port.
Problem: The Compute Module continually restarts
Solution:
• Confirm the OSD COMPUTE MODULE setting for WDT (Watchdog Timer) is set to DISABLE or, if
set to ENABLE, that any watchdog timer function installed is correctly configured to reset the
timer in the display within the TIME PERIOD set on the OSD.
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