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Problem: “RPi Boot” is unable to detect the Compute Module

Solutions:

• If the display is currently in a power save mode (LED is flashing green), press the POWER ON

button on the IR Remote control.

• On the COMPUTE MODULE menu of the OSD, confirm that POWER SUPPLY is set to ON.

• On the COMPUTE MODULE menu of the OSD, confirm that USB BOOT MODE is set to ENABLE.

Note: The Compute Module power will have to be cycled off and on after changing the boot

mode to ENABLE.

• Check that the Compute Module is correctly seated and latched in the SO-DIMM socket on the

Interface board.

• Check that a USB cable is connected from the USB2 connector on the display to the host PC.

• Do not use a USB extender cable or hub between the host PC and the display. The host PC must

be directly connected to the display via a single USB cable.

• “RPi Boot” may have already been run while the Compute Module has been powered up in boot

mode. Running it again will not find the Compute Module.

• Disconnect and reconnect the USB cable to the host PC.

Problem: 3

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

party 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 COMPUTE MODULE setting for MONITOR CONTROL is set to ENABLE

• Confirm the

config.txt file contains the following line:

enable_uart=1

If using the Compute Module 3, the following two lines are also necessary:

dtoverlay=uart1

core_freq=250

NEC C751Q User Manual

Other manuals for NEC C751Q