Troubleshooting Guide
3
Keysight 8990B Service Guide
69
Front panel display isolation
Front panel display trouble isolation
Connect the external monitor to
the VGA port. Turn on the 8990B.
Display on the
external monitor?
Front panel display
remains blank?
Replace the PC motherboard
Check the display cable
connection to the touchscreen
controller board and LCD
Front panel
display working?
Check the inverter board control
cable
Check the voltage on pin 1 of J3 on
the touchscreen controller board. The
voltage should be 12 V.
Try with a new touchscreen
controller board
Replace the
touchscreen
controller board
The voltage is 12 V?
Replace the touchscreen
controller board
Replace the LCD
Front panel display working?
Replace the inverter board
Done
Replace the LCD
Front panel
display working?
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Содержание 8990B
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