Keysight Technologies Option 503 Service Manual page 71

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Figure 2-9 A1A2 Front Panel Interface Board LCD Backlight Inverter Control Voltages
Table 2-2 Expected Backlight Inverter Control Voltage Levels
Signal
Brightness Control
Inverter Enable
Inverter Supply
10.Are all of the 3 voltage levels within their expected ranges?
If yes:
If not:
N9030A PXA Signal Analyzer Service Guide
Expected Vol tage
0 to 3 VDC
>6 VDC
+12 VDC
Replace the A1A4 LCD Inverter board.
Replace the A1A2 Front Panel Interface board.
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