60 Chapter 2
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Figure 2-7 A1A2 Front Panel Interface Board LCD Backlight Inverter Control Voltages
10. Are all of the 3 voltage levels within their expected ranges?
If yes:
Replace the A1A4 LCD Inverter board.
If no:
Replace the A1A2 Front Panel Interface board.
Table 2-1 Expected Backlight Inverter Control Voltage Levels
Signal Expected Voltage
Brightness Control 0 to 3 VDC
Inverter Enable >6 VDC
Inverter Supply +12 VDC
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