NEC LED-FA025i2-220, User Manual

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12 TROUBLESHOOTING
Table 15 summarizes the most common problems you could encounter with the appliance.
If you are unable to solve the problem with the information below, contact the NEC DISPLAY
SOLUTIONS service team:
LED-support@nec-displays.com
Table 15: Troubleshooting Solutions
Problem Solution
No power Check if electric power is switched on.
Check if screen is connected properly to the electric power system.
No picture Adjust the contrast and brightness settings.
Check if the screen saver is activated.
No signal input Check the green LED of the Receiving card is flickering regularly or not
(fast flickering means no signal).
1. Check if the cable connector assembly is stable.
2. Check whether the cable is short-circuited.
3. Check the power of the Receiving card.
In case the above three points do not fix the problem, please exchange
the Receiving card.
Module not working Use a multimeter to test the module. The voltage should be 4.2 V.
Table 16: Signal Light Codes
Light Meaning Signal Interval [in sec]
1 2 3 4 5 6 7 8 9
green
Power supply on         
Power supply off
        
red
Data connection ok         
Data connection bad

[1 ms]
  

[1 ms]
  

[1 ms]
Signal on Controller
lost
        
blue not relevant