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Workstation 5 Field Service Guide
Workstation 5 Troubleshooting
LCD Display Related
LCD Display Related
This section lists LCD display related issues. First, the blank or dark display
issues are addressed, the we move on to situations where the display is
functional, but experiences visual problems.
Let’s define the terms “Dark LCD” and “Blank LCD”, used throughout this
section.
•
Dark LCD indicates that the LCD backlights do not turn on. Any text or
graphics would not be visible under normal lighting conditions.
•
Blank LCD indicates that the LCD backlights are on, but no text or
graphics appear on the screen. In other words there is no video data to
display.
Dark LCD (No Backlight)
Symptoms: The backlights are off, but the unit appears to boot normally (the
unit produces a single beep to indicate a successful POST, the Operator LED
turns solid Blue to indicate the unit booted to the operating system).
•
Defective Backlight Inverter Board.
•
Loose or damaged Backlight Inverter Cable.
•
Check Backlight Supply Voltage (
VCC_BL
) through F1 to J3-4 and 5.
Should be +12V.
•
Defective System Board.
Blank LCD (No Video)
Symptoms: The backlights are on (the LCD is white), the unit appears to boot
normally (the unit produces a single beep, the Operator LED is flashing Blue),
and turns solid Blue after some period of time. No video appears on the LCD.
•
Loose or defective LCD cable.
•
Defective System Board.
•
No Power to LCD Panel.
o
Check LCD Supply Voltage (
VCC_LCD)
at J8-1, 2. Should be +3.3V. If
0V, check switch Q9 and Q10.
Flickering LCD
Symptoms: The flickering may be seen during the blue screen or after the
workstation boots.
•
Disconnected backlight tube(s), or bent/corroded pins on the inverter
connector(s).
