Chapter 4: TroubleshootingTroubleshooting TablesService Manual 4-274.4.3 Display – LCD and Backlights4.4.3.1 White Display, Striped Display, or Color Shift4.4.3.2 Distorted Display: Test or Random Pattern4.4.3.3 Dim or Non-uniform Light8.Using DMM, back-probe J26 pins 1-3 or 2-4.Depending on dimmer pot setting, voltage rangewill be 8 to 12 VAC.9. If no lamp voltage, replace transformer assembly.Possible Causes Step Troubleshooting Procedure CommentsPossible Causes Step Troubleshooting Procedure CommentsPoor LCD cableconnection 1. Check LCD cable connection at Control PCA (J1). LCD Cable PN:6600-1412-6002. If OK, check the LCD cable connection at LCDmodule.3. If OK, replace LCD module.Possible Causes Step Troubleshooting Procedure CommentsMain applicationsoftware not loaded 1. Reload main application code (MAP software).Possible Causes Step Troubleshooting Procedure CommentsBad LCD backlight 1.The backlight may not be connected to the LEDdriver board mounted on the Control Board. Checkto make sure connections are mated correctly aswell as any bent pins.2. If OK, disconnect the LCD cable at the Control PCA.Turn on unit and examine for nonuniform lighting.
