Service manual

Commercial in confidence
SMARTFIND NAVTEX service manual Page 25
5.2. Fault finding in workshop
Strange banding / stripes / artifacts on the LCD
1. Check the flat flexi cable between the LCD and the display PCB - replace if
necessary
2. Replace the LCD module.
3. If still faulty replace the display PCB
Does not start up
1. Ensure that backlight has not failed giving the impression that the unit is
not starting (use a torch or bright light to view screen).
2. Open case and check for trapped backlight wires.
3. Does the red LED flash? If not check the power supply and then replace
the display PCB.
Backlight failed
1. Open case and check for trapped backlight wires.
2. Check for 250VAC on backlight connector, if no replace the display PCB
3. If above does not work then replace the LCD module.
Poor LCD contrast
1. The LCD backlight is rated for 20,000 hours continuous operation, replace
the complete display module (with backlight) to restore the contrast. It is
recommended that the screen saver feature is left enabled to prolong the
backlight service interval.