Chapter 5: Troubleshooting
No Display Trouble Isolation
79
No Display Trouble Isolation
This trouble isolation procedure helps isolate a problem to the assembly level when
there is no display on the flat- panel liquid crystal display screen.
A
Remove the cabinet and install the fan safety shield.
1 Disconnect the power cord from the oscilloscope. See Chapter 6, “Replacing
Assemblies,” for instructions on removing the cabinet. Use care in handling the
oscilloscope.
2 Install the optional fan safety shield, Keysight Technologies P/N 54810- 00601,
over the fans on the left side of the oscilloscope.
WARNING SHOCK HAZARD!
The backlight inverter assembly, which is mounted at the front corner of the oscilloscope
near the flat-panel display, operates at 900 V at turn on. DO NOT handle this assembly
while it is in operation.
WARNING INJURY CAN RESULT!
Once the cover is removed, the fan blades are exposed both inside and outside the
chassis. Disconnect the power cable before working around the fan. Use extreme caution
in working with the oscilloscope when the cover is removed. Install the fan safety shield
(Keysight Technologies
P/N 54810- 00601) on the side of the chassis over the fan. Failure to observe these
precautions may result in injury.
B
Check the fan connections.
Verify that all fans are connected.
1 The oscilloscope fans connect to the fan controller board on the bottom deck A20.
2 The CPU fan connects to the top side of the motherboard noted “CPU Fan.”
3 The Power Supply fan is at the rear of the power supply.
4 Connect the power cord and press the power switch on the front panel. Verify
that all fans are running and that the front panel power switch LED is illuminated.
These are indications that the power supply is functioning. If the fans and LED
are off, go to the Power Supply Trouble Isolation flowchart. Otherwise go to step C.
C
Connect an external monitor, cycle power, and observe the following oscilloscope
power- on sequence. If the power- up on external monitor test fails go to step D.
D Replace Display Card (Keysight Technologies P/N 0960- 2530). If the display is
still having problems go to step E.
E Replace the motherboard assembly A19.
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