Keysight N9038A, Service Manual, Page: 52 / 745

52 Keysight N9038A MXE Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
No Keysight Splash Screen Displayed
(Black background with white “Keysight Technologies” text)
A problem of not displaying the Keysight splash screen could be caused by
many different things. It could be due to a down power supply, a processor
hardware problem, an instrument boot-up process error, a display section
failure, etc.
This procedure assumes that the green Power On LED on the front panel does
turn on when the instrument is turned on. If it doesn't, refer to the “Green
Power On LED Does Not Illuminate” section before proceeding.
1. Remove the AC power cord and then remove the instrument cover. Refer
to Chapter 18, “Assembly Replacement Procedures”, on page 527 in this
manual.
2. Remove the Top Brace. Refer to Chapter 18, “Assembly Replacement
Procedures”, on page 527 in this manual.
3. With the AC power applied and the On/Off button turned on, verify that all
of the power supply voltages are at their proper level. This can easily be
done by viewing the power supply LEDs on the back side of the A7
Midplane board. Refer to the Chapter 12, “Power Supply & Midplane”, on
page 367 .
Are all of the power supply voltages at the proper level?
If yes:
Proceed to step 4 .
If not:
After verifying that the connections between the A6 Power
Supply, the A7 Midplane board, and the A8 Motherboard
are all mechanically and electrically secure, replace the A6
Power Supply assembly.
4. Connect an external VGA monitor to the rear panel display output.
Does the external monitor display the correct information?
If yes:
Proceed to the “Troubleshooting a Blank Display” section
in this chapter.
If not:
Replace the A4 Processor Board assembly.