6. TROUBLESHOOTING
There appears no image on the picture tube, the green LED at the front is out
•Check if the power cord is properly connected to the power outlet and to the display.
•Check if the power button is switched on.
There appears no image, the green LED is on
The display is switched in
•Press the control knob at the rear shortly.
•Try to switch on the display by pressing any key on the keyboard of the computer that produces the video and sync. signals for the display.
•Check if both horizontal and vertical sync. signals are connected to the display and to the computer.
On the picture tube appears the message "No Valid Sync Signal"
•Check if both horizontal and vertical sync. signals are connected to the display and to the computer.
•Check if the sync. signals are connected in the proper way (refer to the chapter "Installation").
•Check if both horizontal and vertical sync. frequencies match the display specifications (refer to the chapter "Technical specifications").
For other problems, please consult your technical service department.
Troubleshooting 34
