Instrument Cannot Completely Load Or Run The Operating System; Troubleshooting A Blank Display - Keysight n9020a Service Manual

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Instrument Cannot Completely Load or Run the
Operating System
A problem of the instrument not loading the operating system can be caused
by a few different things. It could be due to a down power supply, a processor
hardware problem, an instrument boot-up process error, corrupt hard drive,
etc.
This procedure assumes that the instrument can get past the Agilent splash
screen at power on. If it doesn't, refer to the
Splash Screen"
1. Verify that there are no external USB storage devices connected to the
instrument.
2. Does the instrument get far enough along in the boot process to run the
"Agilent Recovery System"?
If yes:
Run the "Agilent Recovery System" by referring to the
Recovery Process" on page
replace the A5 Hard Disk Drive.
If no:
Replace the A5 Hard Disk Drive.

Troubleshooting a Blank Display

This section is intended to troubleshoot a display system problem that would
cause the internal LCD to be blank. It is assumed that the rest of the
instrument is booting up and functioning properly. To determine if the problem
is an internal display issue only, connect an external VGA monitor to the rear
panel display output. If the rear panel display output is also not working go to
the "No Agilent Splash Screen Displayed"
Once it has been determined that the rest of the instrument appears to be
functioning properly there are a few possible problems that could be causing
the display to be blank. They are:
— An LCD Backlight inverter or DC-DC converter problem
— A video signal path integrity problem
— A video controller / LCD problem
section before proceeding.
312. If this does not correct the problem
59
"Instrument Hangs at the Agilent
"Disk Drive
section in this chapter.