Front Panel Display Trouble Isolation - Keysight Infiniium 9000 Series Service Manual

Front Panel Display Trouble Isolation

Yes
SHOCK HAZARD!
WARNING
The backlight inverter assembly, which is mounted at the front corner of the
oscilloscope near the flat-panel display, operates at 1.65 kV at turn on. DO NOT
handle this assembly while it is in operation. An LED on the inverter board
illuminates to indicate the presence of high voltage.
Infiniium 9000 Series Oscilloscopes Service Guide
Connect external monitor to VGA port. Turn unit on.
Check display cable
connection to display card
and LCD
Does
front panel
display
work?
No
Try a golden display
card to verify failure
Does
display work
Yes
with golden
card?
Replace display
card
No
Replace LCD.

Front Panel Display Trouble Isolation

Does
display appear
on ext. monitor
?
Yes
Is
No front Panel
black?
Yes
Check inverter board control
cable.
Check voltage on pin 1 of
J3 on display card. Should
be 12V.
Is
voltage No
OK?
Yes
Replace LCD.
Does
front panel
display
work?
Yes
Go to 'Primary Trouble Isolation'.
Troubleshooting
Replace
No
motherboard.
Replace
display card.
Replace
No
inverter.
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