Agilent Technologies Infiniium 90000 A Service Manual page 72

Chapter 4: Troubleshooting
Display Trouble Isolation
No Display Trouble
Isolation
A
Remove cabinet and
install fan guard
B
Check fan
connections and
power-on
Fans running?
Power LED lit?
Yes
C
Connect external
monitor, cycle power,
and check power up
sequence
Power-up
displayed on ext.
monitor
No
72
Go to 'Power Supply
No
Trouble Isolation.'
Go to 'To check the
Yes
backlight Inverter
voltages.'
D
Replace Display
Board
Display on
oscilloscope?
No
E
Replace
Motherboard
Assembly
No
Display on
oscilloscope?
No
Check the display
board video signals
No
Display on
oscilloscope?
No
Go to Primary
Trouble Isolation
Yes
Done.
Yes
Done.
Yes
Done.
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