NEC LED-VD1 user manual Troubleshooting, Check the following items

Troubleshooting

Check the following items.

Problems/Symptoms	Cause and Solution
Cannot perform LED module mapping	The LED module connector cable for this product must be connected using a DVI dual-link cable.
Cannot perform command communication	• The USB/RS-485 adapter will be detected as a COM port by the PC. Check the COM port number of the connected
	adapter.
	• The 4th and 5th pins of the RJ-45 cable are used for communication. Check to ensure that the 4th and 5th pins of
	your LAN cable are connected properly.
	• Be sure to only use a straight-type LAN cable. Check to ensure that you are not using a crossover LAN cable.
No image signal is displayed	The image signal is only compatible with 1024x768 @60Hz. Check the resolution of the input signal.
The DVI Input Light is flashing	If the resolution of the signal being input to the DVI input terminal is anything other than 1024x768, this light
	will flash.
	Use an input signal with a resolution of 1024x768 @60Hz.

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