Service Manual Chapter3. User Handling Unit
© 2013
Nautilus Hyosung Inc.
All Rights Reserved.
3-3
Troubleshooting Procedure
► The screen is blank
1. “No signal” message is displayed on the LCD.
-> Check whether the DVI cable is properly connected to OPL Assy or VGA card.
-> Check if the main board is in hang-up state or powered off.
-> Check if the display setting of the VGA card is active (using SPL.)
* If the system was booted with the video cable (DVI or RGB) being disconnected,
reconnecting the cable may not solve the problem.
Tip) CTRL+ALT+F1: Activates DVI display.
► The LCD is black
1. Backlight of the LCD panel is off.
-> Check the power cable connection status of OPL assembly. (Check +24V input.)
-> Check the LED color of the OSD board.
- LED OFF: The AD board is in off state. Press OSD Power On/Off button.
- Green ON: The AD board is in normal state.
*Check or replace the inverter cable or inverter board.
-> If the trouble persists, replace the AD board.
-> If the trouble persists even after the AD board is replaced, replace the LCD
assembly.
2. Backlight of the LCD panel is on.
-> Connect/Disconnect the power line of OPL assembly.
-
> If “Nautilus HYOSUNG” logo is not displayed on the OPL screen, replace the AD
board.
► The LCD is displayed white
-> Check the installation status of the LVDS cable inside the assembly.
-> If the trouble persists even when the installation status is normal, replace the cable.
-> If the trouble persists even after the cable is replaced, replace the AD board.
-> If the trouble persists even after the AD board is replaced, replace OPL assy.
► When the screen is in red or other colors (when the color display is normal)
-> Check the connection status of the video cable. (Connect again.)
-> Check whether the video cable has not been damaged using spare video cable.
-> Check the connection status of the LVDS cable. (Connect again.)
-> If the trouble persists, replace the LVDS cable.
-> If the trouble persists even after LVDS cable is replaced, replace the AD board.
► The screen does not provide visible display.
-> If the trouble persists, replace the AD board.
