Troubleshooting Lcd Display Problems - Agilent Technologies N5242A Service Manual

Troubleshooting
Power Up Troubleshooting
3. If the correct voltage is present at each connection and the fan connectors are in good
mechanical condition, suspect a defective fan. Refer to
Fans" on page 7-60.
If the correct voltage is not present, suspect a defective A14 system motherboard. Refer
to "Removing and Replacing the A14 System Motherboard" on page

Troubleshooting LCD Display Problems

This procedure is intended to isolate the faulty assembly when the display is dark. If the
display is lit, but the color mix is faulty, refer to
NOTE There are no front panel adjustments for intensity and contrast of the LCD.
1. If the display is dim, the A3 display assembly is defective. Refer to
Replacing the A1–A3 and Other Front Panel Subassemblies" on page
If the display is dark (not visible), connect an external VGA monitor to the rear panel
Monitor output connector. (Be aware that some multisync monitors might not be able to
lock to a 60 Hz sync pulse.) If the video information is not present on the external VGA
monitor, the most probable cause is the A17 CPU board. Refer to
Replacing the A17 CPU Board Assembly" on page
2. If the external VGA monitor displays the correct information, verify that the front panel
interface ribbon cable is properly plugged into the motherboard connector. Refer to
"Removing and Replacing the Front Panel Assembly" on page
3. If the front panel interface ribbon cable is properly connected, suspect that one or more
of the following is defective:
• inverter board (mounted on the display assembly)
• A1 front panel interface board
• A3 display assembly
4-12
PNA Series Microwave Network Analyzers
"Removing and Replacing the
"A3 Display Test" on page
"Removing and
7-22.
7-8.
Service Guide N5242-90001
N5242A
7-16.
4-15.
"Removing and
7-10.