GE PANDA Service Manual page 90

Chapter 4: Troubleshooting
Troubleshooting Tables
4.4.3.4 Blank Black Screen (with No Alarms)
Possible Causes
Loss of 12V to
Control PCA
LCD backlight is not
connected to the
LED driver board on
the Control Board
4.4.3.5 Display Arrow Present after Installing New LCD
Possible Causes
Protective film on
LCD
4.4.3.6 Black Background Has Red, Green, or Blue Tint
Possible Causes
Bad LCD cable
connection
Defective LCD Cable
4-28
Step Troubleshooting Procedure
Check to make sure the LED7 light is lit on the
1. Control PCA. If the light is red, then the LCD module
is receiving power.
Check the power cable between the Control PCA
2. and Power PCA for correct pins. (Refer to section
"6.13 Wiring Diagrams".)
3. Check fuse F7 on Power PCA.
Check backlight connection to the LED driver
4.
board.
Replace the Control PCA. If backlights still do not
5.
work, replace LCD module.
Step Troubleshooting Procedure
Disassemble Electronics Enclosure and Remove
1.
protective film on LCD.
Step Troubleshooting Procedure
1. Check LCD cable connection at Control PCA (J1).
If OK, check the LCD cable connection at LCD
2.
module.
3. Remove and replace LCD Cable
Comments
Power cable part #:
6600-1567-700
Needle nose pliers,
Ohm Meter
Comments
Comments
LCD Cable PN:
6600-1412-600
Service Manual