Workstation 5 Field Service Guide
3-25
Workstation 5 Troubleshooting
LCD Display Related
•
Defective Backlight Inverter Board.
•
Defective or old backlight tube(s).
LCD Backlight too Dim
Symptoms: The backlight(s) are very DIM at power-up and do not improve
over time as the operating temperature rises.
•
Disconnected backlight tube(s) or bent pins on the inverter connector(s).
•
Defective Backlight Inverter Board.
•
Incorrect LCD Jumper setting. See below.
•
Defective or old backlight tube(s).
LCD Image Problem
Symptoms: The BIOS Splash Screen appears but contains no color and text is
very fuzzy. When the OS boots, the screen appears very dim.
•
Loose cable connection between the system board and LCD panel.
•
Damaged cable - missing one or more conductors.
•
Incorrect LCD Jumper Configuration. Determine if the LCD is Sharp or
AUO and set the jumper - See below.
LCD Quality Problems
Symptoms: The LCD exhibits tearing, loss of vertical or horizontal sync,
flashing colors.
•
Loose cable connection between the system board and LCD.
•
Damaged cable - one or more missing conductors or damaged connector
body.
•
Defective LCD Panel.
Configuring the LCD Jumpers
A total of three jumpers define the LCD panel. Two jumpers are located on the
Backlight Inverter Board to select the LCD Panel Type.
The third jumper, J17 configures the
TFT_PANEL_MODE
signal on Pin-20 of
the interface connector J21.
J17 is located just behind the Mag Stripe Reader connector. For the Sharp
LCD, a jumper is installed between pins 1 and 2 of J17 in order to pull
TFT_PANEL_MODE
high. If this jumper is not installed, or set to pins 2-3, the
Sharp LCD malfunctions, but sustains no permanent damage.
Содержание Workstation 5
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Страница 155: ...Workstation 5 Setup Guide B 13 Connector and Cable Diagrams Hook up Cables Cash Drawer Extension Cable...
Страница 156: ...B 14 Workstation 5 Setup Guide Connector and Cable Diagrams Hook up Cables...