Workstation 5 Field Service Guide
2-15
Workstation 5 System Board Technical Descriptions
TFT LCD and Backlight Interface
Backlight Interface
The backlight enable signal,
DISPEN
originates in the LX800 TFT controller.
This enable signal is ANDed with
SIO_PWM
at U6 to produce
PWMBL
which
drives the backlight inverter board mounted to the LCD plate.
SIO_PWM
originates from an unused fan controller (FANPWM2) in Super I/O #1, U8.
Inverter Board power,
VCC_BL
is supplied by
VCC12
through F1 and FB8. A
pre-regulator circuit is not implemented on the WS5 System Board.
Configuration Jumpers
A total of three jumpers, one on the system board and two on the inverter
board are required to configure the LCD panel type.
System Board jumper J17 is used for LCD Panel configuration. At this
time, one of two possible LCD panels may be used. Production started with
the Sharp LQ150X1LG45 15” LCD Panel and J17 includes a jumper
placed between Pins 1 and 2. Note that Pin-1 faces the rear of the unit. On
later units with an AUO LCD Panel is installed, no jumper will be installed
on J17.
The Backlight Inverter Board contains a pair of jumpers J4 and J5, factory
configured to match the LCD panel installed. The jumper setting is routed
through the interface cable to the system board as
BL_MOD0
and
BL_MOD1
and fed to a pair of general purpose (GPIO28 and GPIO29)
inputs on Super IO #1, U8.
At power-up, the WS5 API reads this pair of bits to determine the LCD
panel type. When it determines the LCD panel type, for example the Sharp,
it references the \DOC\HWInf folder and loads the file
‘lxvideo_Sharp.inf.’ This file contains backlight brightness and brightness
range values optimized for the Sharp LCD. If the AUO panel is used, the
jumpers are set accordingly and the API would load the ‘lxvideo_auo.inf
file from the \DOC\HWInf folder.
Содержание Workstation 5
Страница 112: ...3 44 Workstation 5 Field Service Guide Workstation 5 Troubleshooting WS5 Diagnostic...
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...