Keysight E4980A - 13 Troubleshooting; Check Items When Trouble Occurs; The system does not start up (Nothing is displayed); The system starts up, but the normal measurement screen does not appear (Service Mode)

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Keysight E4980A/AL Precision LCR Meter
User’s Guide
13 Troubleshooting
This chapter lists items to check if you encounter a problem while using the
Keysight E4980A/AL. All of these items should be carefully investigated before
you determine that your E4980A/AL is faulty.
Check Items When Trouble Occurs
The system does not start up (Nothing is displayed)
o Confirm that the power cable is properly plugged in.
o Confirm that the fuse is not blown.
If normal operation does not resume after taking the above measures, there is
the possibility of a failure. Unplug the power cable immediately and contact
Keysight Technologies’s Customer Contact, listed at the end of this guide, or
the company from which you bought the device.
The system starts up, but the normal measurement screen does not appear
(Service Mode)
The Service Mode is a state that occurs when the power-on test fails. Here, the
characters on the display turn yellow and all of the front panel keys are
unavailable.
o Confirm that the power-on test or a self test has failed.
When the power-on test at start-up fails, the error message “Power on test
failed” is displayed in the system message area.
For details on the Service Mode, refer to the Service Guide.
Occasionally, there are missing pixels or constantly lit pixels, but this is not
a malfunction and does not affect measurement results.