Lcd Backlight Too Dim; Lcd Image Problem; Lcd Quality Problem; Configuring The Lcd Jumpers - Micros Systems Workstation 5 Service Manual

• 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
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
Sharp LCD malfunctions, but sustains no permanent damage.
Workstation 5 Field Service Guide
TFT_PANEL_MODE
high. If this jumper is not installed, or set to pins 2-3, the
Workstation 5 Troubleshooting
LCD Display Related
signal on Pin-20 of
3-25