Keysight N9038A, Service Manual, Page: 55 / 745

Keysight N9038A MXE Service Guide 55
Boot Up and Initialization
Potential Problems During Boot Process
Verify LCD Backlight Functionality
Considering the fact that the expected life span of the backlights is much
longer than the LCD itself, it is not very likely that the backlights would cause a
completely blank display.
To determine if a blank display problem is backlight related:
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. Turn the instrument on and allow enough time for it to completely
boot-up.
4. Shine a bright light at the display and look closely for the expected
information (a large flashlight should work). Since most of the display
section of the screen has a black background you will need to look at
either the area next to the softkeys or the area across the top of the
screen, since these sections will have the largest areas of lighter
information in them.
5. Can the expected display information now be seen?
If yes:
The problem is backlight related. Proceed to step 6 .
If not:
The problem is not backlight related. Skip to “Verify Video
Signal Path Integrity” .