Asus PA246Q User manual

Service Manual PA246Q
1
LCD Monitor Service Manual
Model: PA246Q
V 1.0
RESTRICTIONS ON USE OF MATERIALS
:

Service Manual PA246Q
5
Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all ASUS equipment. The service
procedures recommended by ASUS and described in this service manual are effective methods of performing
service operations. Some of these service operations require the use of tools specially designed for the purpose.
The special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully
read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. ASUS could not possibly know, evaluate and advise the service trade of all conceivable ways
in which service might be done or of the possible hazardous consequences of each way. Consequently, ASUS has
not undertaken any such broad evaluation. Accordingly, who uses a service procedure or tool which is not
recommended by ASUS must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
FOR PRODUCTS CONTAINING LASER:
DANGER- Invisible laser radiation when open.
AVOID DIRECT EXPOSURE TO BEAM.
CAUTION- Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
CAUTION- The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART
NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE MANUAL
Take care during handling the LCD module with backlight unit
- Must mount the module using mounting holes arranged in four corners.
- Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
- Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
- Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
- Make certain that treatment body is grounded through wrist band.
- Do not leave the module in high temperature and in areas of high humidity for a long time.
- Avoid contact with water as it may as hort circuit within the module.
- If the surface of panel became dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)

Service Manual PA246Q
6
1 Monitor Specifications
1.1 Introduction
This specification describes ASUS PA246Q, a 24” Wide multi-interface (Analog +DVI +HDMI +DisplayPort) color
TFT LCD monitor. The display supports up to 1920*1200/60 Hz resolution & refresh rate and 1.07 billion colors
(HDMI & DP).The features summary is shown below,
Feature items Specifications Remark
Panel supplier & Panel type of supplier LGD LM240WU4-SLB3 Transmissive mode, normally black
Actual Size Diagonal display 24” Wide (16:10) Panel display size
Actual Resolution display (1920x1200/60Hz) Panel display resolution
Viewing Angle
(at Contrast Ratio ≧ 10)
178 degrees Horizontal
(typ.)
178 degrees Vertical (typ.)
Panel spec
Color Gamut 102%
Analog interface with Scaling supported Yes With 15 pin D-sub connector
DVI interface with Scaling supported Yes With 24 pin DVI-D connector
HDCP supported Yes
HDMI supported Yes With 19 pin HDMI connector
DisplayPort supported Yes With 20 pin DisplayPort connector
Video interface with Scaling supported
No N.A.
Max resolution mode supported 1920x1200@60Hz
Number of Display Colors supported 1.07 billion colors 8-bit + A-FRC,
Contrast Ratio 1000:1 (typ.)
Dynamic Contrast Ratio 50000:1
The monitor would increase the backlight
when display a dark image.
Scenery Mode : under 7 gray scale
Theater Mode : under 17 gray scale
Luminance
1.) LCD panel luminance
spec: 400 cd/m2 (typ.)
320 cd/m2 (min.)
2.) Monitor’s factory
default luminance spec:
270 cd/m2 (typ.)
370 cd/m2 (max.)
1.) Panel luminance spec is measured at
saturated R/G/B and CCFL=6~7mA (typ.)
condition.
2.) Monitor’s factory default luminance spec
is measured at User Mode default color
temperature (6500K).
AC power input
Yes 100-240Volts, 50/60 Hz.
DC power input (with AC power adapter) No
DPMS supported < 1 Watt
LED indicator for power status showed Yes White/Orange/Non
OSD for control & information supported Yes
Multi-language supported for OSD Yes 10 languages
Buttons control supported Yes
7 buttons including 1 monitor power on/off
control button
Flywheel control supported No
Scaling function supported Yes ST STDP8028(Mars)

Service Manual PA246Q
7
Auto adjustment function supported Yes Press and hold “Splendid-key” for 2 ~ 4
seconds
DDC function supported (EDID ver.1.3) Yes DDC2B
DDC-CI support version 1.1 or later Yes DDC-CI
Audio speakers supported No
Audio Jack (input connector) supported No
Earphone Jack (output connector)
supported Yes
Microphone function supported No N.A.
USB 2.0 hub supported Yes 2 USB ports
Card reader supported Yes
Supported Media Types :
Memory Stick (MS),
High Speed Memory Stick (HSMS),
Memory Stick PRO (MSPRO),
Memory Stick Duo(w Adapter),
MS Duo Secure Digital (Mini-SD),
Secure Digital Card,
Mini Secure Digital(w Adaptor),
TransFlash(SD, including SDHC),
MultiMediaCard(MMC),
Reduced Size MultiMediaCard(RS-MMC),
NAND Flash,
xD
Card Slots :
Lower Slot (built-in Push Ejection
Mechanism):
SD / MS / MMC/xD – direct insertion
MS Duo / Mini-
SD / TransFlash Card /
RS-MMC – with adapter
Mechanical Tilt base design Yes
VESA wall mounting design
Yes
Mechanical Rotate design Yes
Mechanical Lift base design Yes
1.2 Dimension
Item Condition Spec OK N.A Remark
Bezel opening 520.4 x 326 mm √
Monitor without Stand L x W x D mm 558.4*380.8*79 mm √
Monitor with Stand L x W x D mm 558.4*380.8*235 mm √
Carton Box (outside) L x W x H mm 683*457*298 mm √
Tilt, Swivel and Lift range Tilt: -5/+20 degree
Swivel: ±60 degree
Lift: 100mm
√

Service Manual PA246Q
8
1.3 Weight
Item Condition Spec OK N.A Remark
Monitor (Net) 7.3 kg +/- 4% √
Monitor with packing (Gross) 10 kg + 5% √
1.4 Plastic
Item Condition Spec OK N.A Remark
Flammability UL 94 HB √
Heat deflection To ABS 75 ℃
√
UV stability ABS Delta E < 3.0 √
Resin ABS/HB GPPC D350
BASF GP-35
CHEIL SD0150
CHIMEI PA757
LG HF380
KINGFA HP-126
√
Texture MT-11000
MT-11010
MT-11020
√
Color DB39A √
1.5 Carton
Item Condition Spec OK N.A Remark
Color Color box √
Material BC Flute √
Compression strength 400 KGF
Burst Strength 18 KGF/cm2
Stacked quantity 7 layers √

Service Manual PA246Q
9
2 Operation Instructions
2.1 Video performance
Item Condition Spec OK N.A Remark
Resolution
Any input resolution modes
which
are under
1920x1200
1920 x1200@60Hz √
Contrast ratio 1000:1(typ.) √
Brightness At R
、 G 、
B saturated
condition
270 cd/m
2
(typ.)
370 cd/m
2
(max) √
Response time
Rise Time
Decay Time
Gray to Gray
6 ms (typ.)
7 ms (typ.)
6 ms (typ.)
√
Viewing angle R/L 178(Typ.)
U/D 178(Typ.) √
CIE coordinate of White (0.313, 0.329) +/- (0.
03,
0.03) √
Display colors 1.07 Billion colors √Only HDMI & DP
2.2 Brightness Adjustable Range
Item Condition Spec OK N.A Remark
Brightness adjustable range
At Max. Contrast level &
Full-white color pattern
(Max. brightness value –
Min. brightness value)
≧ 100 cd/ ㎡
√
2.3 Acoustical Noise
Item Condition Spec OK N.A Remark
Acoustical Noise Front side distance : 30cm
Back side distance : 4cm
Front side < 23 dB
Back side < 28 dB
√
2.4 Environment
Item Condition Spec OK N.A Remark
Temperature Operating 0 ~ 40
℃ √
Non-operating -20 ~ +60
℃ √
Humidity Operating 10 ~ 90% √Non-condensing
Non-operating 5 ~ 90% √Non-condensing
Altitude Operating 0~3,657m (12,000ft) √Without packing
Non-operating 0~12,192m (40,000ft) √With packing

Service Manual PA246Q
10
2.5 Transportation
Item Condition Spec OK N.A Remark
Vibration Unpacked, Non-Operating 20 Hz, 0.0185 g
2
/Hz
200 Hz, 0.0185 g
2
/Hz
(Duration: 5 min Per AXIS)
√
Package Test √
(1)Random Vibration Package, Non-Operating 1Hz, 0.0001 g
2
/Hz
4 ~100 Hz, 0.0001 g
2
/Hz
200 Hz, 0.001 g
2
/Hz
(Equivalent to 1.15 Grms)
(Duration: 30 min Per
surface on Z Axis)
√
(2)Drop Package, Non-Operating 91 cm Height
(2 corners, 2 edges, 6
faces)
√
2.6 Electrostatic Discharge Requirements
Item Condition Spec OK N.A Remark
Electrostatic Discharge IEC801-2 standard Contact: 8KV
Air: 15KV
√
2.7 Reliability
Item Condition Spec OK N.A Remark
MTBF Prediction Refer to Telcordia
(Bellcore)
≧ 80,000 Hours (goal) √Excluding the
LCD, CCFL
CCFL Life time at 25 °C 2  °C ≧ 40,000 Hours (SA) √See Note
Note: The lifetime of LED is defined as the time when LED packages continue to operate under the conditions at Ta
= 25 ±2 and I= (20)mA (per chip) until the brightness becomes _ 50% of its original value.

Service Manual PA246Q
11
2.8 User’s hardware control definition:

Service Manual PA246Q
12
2.9 OSD control function definition
Item File Name Graphic Related OSD Comment
1 ButtonTypeC_F_L.png This will be used in those OSD for CI module. (Suggest : Do not change)
2 ButtonTypeC_F_M.png This will be used in those OSD for CI module(Suggest : Do not change)
3 ButtonTypeC_F_R.png This will be used in those OSD for CI module(Suggest : Do not change)
4 ButtonTypeC_N_L.png This will be used in those OSD for CI module(Suggest : Do not change)
5 ButtonTypeC_N_M.png This will be used in those OSD for CI module(Suggest : Do not change)
6 ButtonTypeC_N_R.png This will be used in those OSD for CI module(Suggest : Do not change)
7 grybar_cursor_b_m.png This will be used in those OSD for CI module(Suggest : Do not change)
8 grybar_cursor_f_m.png This will be used in those OSD for CI module(Suggest : Do not change)
9 grybar_cursor_n_m.png This will be used in those OSD for CI module(Suggest : Do not change)
10 shop_mode_img.bmp
11 volume_MUTE.bmp
volume_on.bmp
12 sound_mode_img.bmp
13 menu_info_notice.bmp

Service Manual PA246Q
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14 menu_info_notice.bmp
menu_button.bmp
15
menu_lock.bmp
menu_lock_hide.bmp
menu_time.bmp
menu_channel.bmp
menu_channel_hide.b
mp menu_option.bmp
menu_picture.bmp
menu_audio.bmp
16
volume_ball_blue.bmp
volume_ball_gray.bmp
volume_ball_purple.bm
p
volume_ball_purple_hid
e.bmp

Service Manual PA246Q
14
17
bmp_bubbles.bmp
volume_ball_gray.bmp
volume_ball_gray_hide.
bmp
triangle_down.bmp
arrow_down_1.bmp
arrow_down_2.bmp
arrow_up_1.bmp
arrow_up_2.bmp
arrow_left_1.bmp
arrow_left_2.bmp
arrow_right_1.bmp
arrow_right_2.bmp
18
ball_yellow_down.bmp
ball_yellow_bg_up.bmp
ball_gen_bg_up.bmp
ball_gen_bg_down.bmp
ball_green_bg_up.bmp
ball_green_bg_down.b
mp
ball_blue_bg_up.bmp
ball_blue_bg_down.bm
p arrow_down_1.bmp
arrow_down_2.bmp
arrow_up_1.bmp
arrow_up_2.bmp
arrow_left_1.bmp arrow

Service Manual PA246Q
15
19
ball_bg.bmp
manual_scan_icon.bmp
bmp_bubbles2.bmp
ball_blue_bg_up.bmp
ball_blue_bg_down.bm
p
ball_green_bg_down.b
mp
ball_green_bg_up.bmp
ball_red_bg_up.bmp
ball_red_bg_down.bmp
ball_yellow_bg_up.bmp
ball_yellow_bg_down.b
mp
ball_gen_bg_down.bmp
ball_gen_bg_
Red (207, 49, 48)
Yellow (254, 203, 92)
Green (166, 174, 122)
Blue(213, 89, 43)
20
list_Bubble.bmp
list_Bubble_R.bmp
list_bar_M.bmp
list_bar_R.bmp

Service Manual PA246Q
16
21 list_Bubble_source.bmp 1. Please refer to Item24 for the title bar on the up. 2. Please refer to Item 19
for the bottom of the OSD
22 list_Bubble_info.bmp 1. Please refer to Item24 for the title bar on the up. 2. Please refer to Item 19
for the bottom of the OSD
* The detailed firmware functions’ specification, please refer to C212 S/W spec. document.

Service Manual PA246Q
17
3 Input/Output Specification
3.1 Power supply
Item Condition Spec OK N.A Remark
Input Voltage range Universal input full range 100-240V, 50/60 Hz √
Input Current range 100 ~ 240VAC < 2 Arms √
Normal “On” operation < 130 Watts √ LED: White
DPMS “Sleep” state ≤1 W √ LED: Orange
DPMS “Off” state ≤1 W √ LED: Off
Power Consumption
AC Power Switch Off 0 W √ LED: Off
Inrush Current 110 VAC
220 VAC
< 30 A (peak)
< 60 A (peak) √
Cold-start
Earth Leakage Current 264 VAC/50Hz < 3.5 mA √
Hi-Pot 1. 1500VAC, 3 sec
2. Ground test: 30A, 3sec
Without damage
< 0.1 ohm √
(on-line test)
(in-lab test)
Power Line Transient IEC1000-4-4 1KV √
IEC1000-4-5 (Surge) Common: 2KV,
Differential: 1KV √
CCFL operation range 90 ~ 264VAC 6mA ~ 7mA
(With 100% Duty) √
Panel spec.
CCFL Frequency 90 ~ 264VAC 54KHz ~ 58KHz
(With 100% Duty) √
Panel spec.
Power cord
Color: Black
Length: 1800mm +/-
50mm
√
3.2 Signal interface
Item Condition Spec OK N.A Remark
D-Sub Color: Black
Length: 1800 mm
√ with blue connector
DVI-D Color: Black
Length: 1800 mm
√ with white connector
HDMI Color: Black
Length: 1800 mm √
Displayport (DP) Color: Black
Length: 2000 +/- 50mm
√ DP 1.1 protocol
USB 2.0 cable Color: Black
Length: 1800 +/- 30mm
√
Signal Cable
Audio Color: Black
Length: 1800 mm √
with green Jack
15 pin D-sub connector See Note 1 √ For 15 pin D-sub
24-pin DVI-D connector See Note 2 √ For 24-pin DVI-D
19-pin HDMI connector See Note 3 √ For 19-pin HDMI
Pin assignment
20-
pin DisplayPort
connector
See Note 4 √
For 20-
pin DisplayPort
Signal type Separate analog R
、
G
、
B √ For 15 pin D-sub
Level 700 mV +/- 5% (peak to peak) √
Analog
Impedance 75 Ohms +/- 2% Ohms √
Sync Signal type Separate H/V-sync
(Positive/Negative)
√ For 15 pin D-sub

Service Manual PA246Q
18
Level Logic High: 2.0V ~ 5.5V
Logic Low: 0V ~ 0.8V (TTL level)
√ Refer to VESA VSIS
Standard V1R1
Impedance Minimum 2.2KΩ(pull down) √ 2.2KΩfor application
Level 600mV for each differential line √
Digital input Impedance 100 Ohm TDR Scan needed for
DVI cable and interface board
√
Level 600mV for each differential line √
HDMI input Impedance
100 Ohm differential TDR Scan
needed for HDMI cable and
interface board
√
Level 600mV for each differential line √
DisplayPort input
Impedance
100 Ohm differential TDR Scan
needed for DisplayPort cable and
interface board
√
Note 1: The pin assignment of D-sub , DVI , HDMI , DisplayPort connectors are as below:
15 pins D-sub connector (Female):
Pin Signal Assignment Pin Signal Assignment
1 Red video 9 PC5V (+5 volt power)
2 Green video 10 Sync Ground
3 Blue video 11 Ground
4 Ground 12 SDA
5 Cable-Detect 13 H-Sync (or H+V)
6 Red Ground 14 V-sync
7 Green Ground 15 SCL
8 Blue Ground
Note 2: The pin assignment of 24-pin DVI-D connector (Female) is as below,
Pin Signal Assignment Pin Signal Assignment
1 TMDS RX2- 13 TMDS RX3+
2 TMDS RX2+ 14 +5V Power
3 TMDS Ground 15 Self-test (Cable detect)
4 TMDS RX4- 16 Hot Plug Detect
5 TMDS RX4+ 17 TMDS RX0-
6
DDC Clock
18
TMDS RX0+

Service Manual PA246Q
19
7
DDC Data
19
TMDS Ground
8
Floating
20
TMDS RX5
-
9
TMD
S RX1
-
21
TMDS RX5+
10
TMDS RX1+
22
TMDS Ground
11
TMDS Ground
23
TMDS Clock+
12
TMDS RX3
-
24
TMDS Clock
-
Note 3: Type A (Receptacle) HDMI
HDMI Digital connector pin assignments
PIN MNEMONIC SIGNAL
1 TX 2 + TMDS Data 2 +
2 SHLD 2 TMDS Data 2 Shield
3 TX 2 - TMDS Data 2 -
4 TX 1 + TMDS Data 1 +
5 SHLD 1 TMDS Data 1 Shield
6 TX 1 - TMDS Data 1 -
7 TX 0 + TMDS Data 0 +
8 SHLD 0 TMDS Data 0 Shield
9 TX 0 - TMDS Data 0 -
10 TX CLK + TMDS Clock +
11 TX CLK SHLD TMDS Clock Shield
12 TX CLK - TMDS Clock -
13 CEC Consumer Electronic Control
14 NC No Connect
15 DDC Clk DDC Clock
16 DDC Data DDC Data
17 GND CED and DDC Ground
18 +5V +5V Power (from the media box)
19 HPD Hot Plug Detect
Note 4: The pin assignment of 20-pin DisplayPort connector is as below,
20-pins DisplayPort female

Service Manual PA246Q
20
Pin Signal Assignment Pin Signal Assignment
1 Lane0 P 11
Ground
2 Ground 12
Lane3 N
3 Lane0 N 13 Ground
4 Lane1 P 14 EDID WP
5 Ground 15 AUX_CH P
6 Lane1 N 16 Ground
7 Lane2 P 17 AUX_CH N
8 Ground 18
Hot Plug Detect
9 Lane2 N 19
Return
10
Lane3 P
20
DP_PWR
3.3 Input Video Signal Performance Requirement
Item Condition Spec OK N.A Remark
Max. support Pixel rate 193.25 MHz √DVI only 165 MHz
Max. Resolution 1920 x 1200@60Hz √
Rise time + Fall time
(for D-sub input)
< 2.509 ns
(50% of minimum pixel
clock period)
√1920x1200 @ 60Hz
(max. support timing)
Settling Time after
overshoot /undershoot
< 5% final full-scale value
√
Refer to VESA VSIS
Standard V1R1
Overshoot/Undershoot < 12% of step function
voltage level over the full
voltage range
√
Refer to VESA VSIS
Standard V1R1
3.4 Scan range
Item Condition Spec OK N.A Remark
Horizontal 31 ~ 83 KHz √
Vertical 50 ~ 76 Hz √Without Frame buffer
3.5 Plug & Play DDC2B Support
Item Condition Spec OK N.A Remark
DDC channel type DDC2B / DDC-CI √Refer to Q212 S/W
spec document to see
the detailed DDC-CI
command list.
EDID Version 1.3 √Refer to Rebel Q212
S/W spec document
to see the detailed
EDID data definition.

Service Manual PA246Q
21
3.6 Support Timings
VGA+DVI+HDMI (PC)
Input Timing
Resolution
Horizontal
Frequency
(KHz)
Vertical
Frequency (Hz)
Dot Clock
Frequency
(MHz)
Actual display
Resolution
OK N.A Remark
640x480 31.47(N) 59.94(N) 25.18 1920x1200 √
VGA
640x480 35.00(N) 66.66(N) 30.24 1920x1200 √
Macintosh
640x480 37.87(N) 72.82(N) 31.5 1920x1200 √
VESA
640x480 37.5(N) 75.00(N) 31.5 1920x1200 √
VGA
720x400 31.47(N) 70.08(P) 28.32 1920x1200 √
VGA
800x600 35.16(P) 56.25(P) 36.00 1920x1200 √
SVGA
800x600 37.88(P) 60.32(P) 40.00 1920x1200 √
VESA
800x600 48.08(P) 72.12(P) 50.00 1920x1200 √
SVGA
800x600 46.86(P) 75.00(P) 49.50 1920x1200 √
VESA
832X624 49.72(P/N) 74.55(P/N) 57.28 1920x1200 √
APPLE
1024x768 48.36(N) 60.00(N) 65.00 1920x1200 √
VESA
1024x768 56.476(N) 70.069(N) 75.00 1920x1200 √
UVGA
1024x768 60.02(N) 75.00(N) 78.75 1920x1200 √
VESA
1152x864 67.5(P/N) 75.00(P/N) 108.00 1920x1200 √
VESA
1280x960 60.00(P) 60.00(N) 108.00 1920x1200 √
VESA
1280x1024 63.98(P) 60.02(P) 108.00 1920x1200 √
VESA
1280x1024 79.98(P) 75.02(P) 135.00 1920x1200 √
VESA
1366x768 47.712(P) 59.79(P) 85.50 1920x1200 √
VESA
1440x900 55.94(N) 59.89(P) 106.50 1920x1200 √
CVT
1.30MA
1600x1200 75.00(P) 60.00(P) 162.00 1920x1200 √
VESA
1680x1050 65.29(N) 60.00(P) 146.25 1920x1200 √
CVT
1.76MA
1920x1080 67.5(P) 60.00(P) 148.5 1920x1200 √
VESA
1920x1200
(Reduced
Blanking)
74.038(P) 59.95(N) 154 1920x1200 √ VESA
1920x1200 74.556(N) 59.885(P) 193.25 1920x1200 √
VESA
Note: “P”, “N” stands for “Positive”, “Negative” polarity of incoming H-sync/V-sync (input timing)
Timing mode:
When the monitor is operating in the video mode (ie, not displaying data) using the HDMI connector, the following
high definition modes shall be supported in addition to standard definition video.
Preset
Timing Name
Pixel
Format
Horz Freq
(kHz)
Vert Freq
(kHz)
Pixel Rate
(MHz) OSD Display
1 480p 720x480 31.469 60 27 480p-60Hz
2 720p60 1280x720 45 60 74.25 720p-60Hz
3 576p 720X576 31.25 50 27 576p-50Hz
4 720p50 1280X720 37.5 50 74.25 720p-50Hz
5 1080p60 1920x1080 67.5 60 148.5 1080p-60Hz
6 1080p50 1920x1080 56.25 50 148.5 1080p-50Hz

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
e
e
r
r
f
f
a
a
c
c
e
e
b
b
o
o
a
a
r
r
d
d
HDMI
DC o DC
Card
Reader
USB
USB 1
USB 2
C
C
o
o
n
n
r
r
o
o
l
l
b
b
o
o
a
a
r
r
d
d
7 keypads + LED
(blue, amber)
C rl BD
DVI
Display
Por
Earphone
Ou
USB
up s ream
Firmware
Flash
16M bi s
24C32
EEPROM
EEPROM
EEPROM
DDR2
LVDS Conn. 1 LVDS Conn. 2
USB
Power
Power
AC o DC
AC Inpu
P
P
o
o
w
w
e
e
r
r
b
b
o
o
a
a
r
r
d
d
Inver er
AC Power
Backligh
C rl BD
U
US SB B H Hu ub b
b
b
o
o
a
a
r
r
d
d

Service Manual PA246Q
23
functions. A/D converter converts analog signal to digital data. OSD is offering adjustable functions to
end-user. Detect timing is for detect change mode. Scalar generates the pixel clock to the T-CON.
Finally output the digital RGB data, the Hsync, Vsync and pixel clock to LCD panel driver IC.MCU offers
H/W DDC2BI function & controls system processing. EEPROM is stored DDC data, OSD common data
and user mode data. A headphone audio circuit is also provided by interface board to add the
headphone output features.
(a) IC introduction
1. ST STDP8028 is an all-in-one LCD monitor controller supporting WUXGA, and integrates ST high
performance ADC, TMDS Rx with HDCP, scaling engine, OSD engine, LVDS Tx, and so on.
2. EEPROM: We use 24C32 to store all the adjustable data and user settings. The HDCP KEY is stored in
it.
3. Serial Flash: It controls all the functions of this interface board, just like the OSD display setting, the
adjustable items, adjusted data storage, the external IIC communication, support DDC2BI.
4. SMSC USB2649 IC: The 2-port USB HUB is fully compliant with USB 2.0 specification and will attach to
an upstream port as a Full-/High- Speed HUB.
B. Power Board Diagram
Fig.1
#1 EMI Filter
This circuit is designed to inhibit electrical and magnetic interference for meeting FCC, VDE, VCCI
standard requirements.