Asus PA246Q, Service Manual

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Service Manual PA246Q
22
4 Block Diagram
4.1 Function block
PA246Q is a 24” WUXGA (1920x1200) resolution TFT LCD monitor. The monitor shall support VGA,
DVI, Displayport and HDMI with HDCP inputs. Moreover, PA246Q equips headphone out to enhance its
features and one USB upstream, two USB inputs and card reader. It’s compliant with VESA specification to
offer a smart power management and power saving function. It also offers OSD menu for users to control
the adjustable items and get some information about this monitor, and hotkey function is to offer users an
easy method to set some common functions by pressing several hotkeys which also include some auto
adjust functions.PA246Q also offer DDC/CI function to meet VESA standard.
A246Q consists of a head and a stand (base). The head consists of a LCD module with lamps, a
power board, a control board, a USB hub board and an interface BD.
The block diagram is shown as below.
A. Interface Board
A basic operation theory for this interface board is to convert analog signals of Red, Green and Blue
to digital signals of Red, Green and Blue, and to provide DVI port equipped with HDCP key, for receiving
DVI signal to generate high quality image. In addition, it provides HDMI and Displayport input ports,
equipped with HDCP key, for receiving HDMI and Displayport signals to generate high quality image
and audio. The scaling IC has internal A/D converter, internal OSD and auto detect input timing
DDR2
LCD panel module
STDP8028-AB
Scaler
EEPROM
D-sub
I
I
n
n
t
t
e
e
r
r
f
f
a
a
c
c
e
e
b
b
o
o
a
a
r
r
d
d
HDMI
DC to DC
Card
Reader
U
S
B
USB 1
USB 2
C C o o n n t t r r o o l l b b o o a a r r d d
7 k LED
(blue, amber)
C
trl
B
D
DVI
Display
Port
Earphone
Out
USB
up stream
Firmware
Flash
16M bits
24C32
EEPROM EEPROM EEPROM
DDR2
LVDS Conn. 1 LVDS Conn. 2
U
S
B
P
o
w
e
r
P
o
w
e
r
AC to DC
AC Input
P
P
o
o
w
w
e
e
r
r
b
b
o
o
a
a
r
r
d
d
Inverter
AC Power
Backligh
C
trl
B
D
U U S S B B H H u u b b
b b o o a a r r d d