36 | CHAPTER 5 – TROUBLESHOOTING
To interpret a
flashing red LED
If the LED flashes red six times, and then the LCD monitor turns off, the internal
temperature of the LCD monitor is higher than its normal operating temperature. Do
not turn on the monitor again until the internal temperature has reduced to its normal
operating temperature.
OR
If the LED flashes red more than six times, the LCD monitor could have detected a
component failure. Please contact SMART technical support. For contact infromation,
see Technical Support on page49.
Troubleshooting Wireless Remote Control Issues
To troubleshoot issues
with the remote control
1. Confirm that the wireless remote control is pointing at the wireless remote control
sensor.
2. Confirm that there are no object’s between the remote control and the sensor. For
more information on the optimum angle for the wireless remote control, see Using
the Wireless Remote Control on page 23.
3. Confirm that there is no direct sunlight or strong illumination reaching the remote
control sensor of the LCD monitor, or when there is an object in the path.
4. Confirm that the remote control’s batteries are inserted correctly.
5. Replace the batteries.
6. For additional troubleshooting suggestions, see the NEC MultiSync S521 User’s
Manual (document 145185).