Keysight E4982A Troubleshooting Manual page 28

1
Troubleshooting
26
Step 4.
Check the external monitor
Connect an external VGA monitor to the External Monitor
Output Port on the E4982A rear panel.
• If something is displayed on the external monitor, the
problem seems to be related to the LCD display. Also,
check the A52 Front Panel I/F board because the
ON/OFF setting of the LCD backlight is controlled by
the A52 Front Panel I/F board.
• If nothing is displayed even on the external monitor,
the problems seems to be in the A60 CPU module.
Step 5.
Check the flat cable
Check the flat cable between the A60 CPU Module and A52
Front Panel I/F board.
Step 6.
Check around the backlight
Check the inverter board and the cable between the inverter
board and A52 Front Panel I/F board. Also check the cables
between the LCD and A52 Front Panel I/F board. If the
cables are normal, check the LCD display.
LCR Meter