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AL922SG
Schematic
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Acer AL922, AL922SG Schematic

AL 922 TFT LCD MONITOR
CONTENTS
1. INTRODUCTION ..........................................................................................................................................3
Scope .....................................................................................................................................................................3
1.1
2. ELECTRICAL REQUIREMENTS .................................................................................................................4
Standard Test Conditions......................................................................................................................................4
2.1
3. VL-901 DISPLAY CONTROL BOARD.......................................................................................................20
Description..........................................................................................................................................................20
3.1
4. VK901 Control Panel Board .....................................................................................................................25
Description..........................................................................................................................................................25
4.1
5. INVERTER BOARD....................................................................................................................................27
Description..........................................................................................................................................................27
5.1
6. DC/DC POWER and Audio CKT VM-902 .................................................................................................29
Input:...................................................................................................................................................................29
6.1
7. TROUBLESHOOTING ...............................................................................................................................31
Main Procedure..................................................................................................................................................31
7.1
8. MECHANICAL REQUIREMENTS..............................................................................................................36
Vibration and Shock............................................................................................................................................36
8.1
9. Power Line Transient Test (IEC 61000-4-4 Fast Transients/Burst)......................................................40
Peak Voltage.......................................................................................................................................................40
9.1
1
10. Power Line Surge Test (IEC 61000-4-5 Surge) .......................................................................................43
Clima tic Condition..............................................................................................................................................43
10.1
11. ENVIROMENT REQUIREMENT................................................................................................................44
Operating............................................................................................................................................................44
11.1
12. REGULATION COMPLIANCE...................................................................................................................45
This product comply to the most current revisions of following regulations:.....................................................45
12.1
13. QUALITY AND RELIABILITY .................................................................................................................... 47
Qu ality Assurance...............................................................................................................................................47
13.1
Appendix A: Parts Lists ---------------------------------------------------------------------------------------- 48 Appendix B: Display Unit Assembly------------------------------------------------------------------------- 53 Appendix C: P.C.B.A ASSEMBLY -------------------------------------------------------------------------- 61
2
1. INTRODUCTION
1.1 Scope
This specification defines the requirements for the 19” MICRO-PROCESSOR based Multi­mode supported high resolution color LCD monitor, This monitor can be directly connected to general 15 pin D-sub VGA connector and DVI-D digital connector, eliminates the requirement of optional special display card. It also supports VESA DPMS power management and plug & play function. There is a build-in stereo audio amplifier with volume control to drive a pair of speakers.
1.2 Description
The LCD monitor is designed with the latest LCD technology to provide a performance oriented product with no radiation. This will alleviate the growing health concerns. It is also a space saving design, allowing more desktop space, and comparing to the traditional CRT monitor, it consumes less power and gets less weight in addition MTBF target is 20k hours or more.
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2. ELECTRICAL REQUIREMENTS
2.1 Standard Test Conditions
All tests shall be performed under the following conditions, unless otherwise specified.
Ambient light: 225 lux Viewing distance : 50 cm in front of LCD panel Warrn up time All specifications: 30 minutes Fully functional: 5 seconds Measuring Equipment: Chroma 2250 signal generator or equivalent, directly Connected to the monitor under test. Minolta CA100 photometer, or equivalent Control settings User brightness control: Maximum (unless otherwise specified ) User contrast control: Typical (unless otherwise specified ) User red/white balance, Green/white balance and Blue/white balance control: In the center (unless otherwise specified ) Power input : 110Vac or 230Vac
Ambient temperature : 20 ± 5 ˚C ( 68 ± 9 ˚ F)
Analog input mode : 1280 x1024 /60 Hz
2.1.1 MEASUREMENT SYSTEMS
The units of measure stated in this document are listed below:
1 gamma = 1 nano tesla 1 tesla = 10,000 gauss
cm = in x 2.54 lb = kg x 2.2
degrees F = [°C x 1.8] + 32 degrees C = [°F - 32]/1.8
u' = 4x/(-2x + 12y + 3) v' = 9y/(-2x + 12y + 3)
x = (27u'/4)/[(9u'/2) - 12v' + 9] y = (3v')/[(9u'/2) - 12v' + 9]
nits = cd/(m2) = Ft-L x 3.426 lux = foot-candle x 10.76
2.2 LCD monitor General specification
Panel Type : 19 “ active matrix color TFT LCD
1). FUJITSU FLC48SXC8V
Display size : 376.32mm(H) x 301.056mm(V)
Display mode : VGA 720 X 400 (70 Hz)
VGA 640 X 480 (60/66/70/72/75 Hz)
SVGA 800 X 600 (60/70/72/75 Hz)
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XGA 1024 X 768 (60/70/75 Hz)
SXGA 1280 X 1024 (60/70/75 Hz) standard resolution
Pixel pitch : 0.098x3mm(H) x 0.294mm(V)
Display Dot : 1280 x (RGB) x 1024
Pixel Clock : 25.2 – 135.0MHz
Contrast ratio:
Brightness: 250 cd/m
Response time (Tr/Tf) : 15 /10 msec
Display color : 16777216 (8 bite color)
Viewing angle: L / R ≧ 85 / ≧ 85 ( ≧ 170 degrees horizontal typical)
U / D ≧ 85 / ≧ 85 ( ≧ 170 degrees vertical typical)
Luminance Uniformity : > 70 %
Pc interface: 1). Video : RGB analog 0.7V peak to peak
Sync : TTL positive or negative
2). Digital TMDS
Signal connector : 15 pin Mini D type, (standard VGA video)
DVI-D connector
Audio power : 1Wrms + 1Wrms ( 300Hz – 10kHz (S.P.L. – 10 dB))
Front control : power on/off with LED select (up, down) adjustment (+,-)
Interface frequency
θ
= 0˚ 500 : 1 (typical)
2
(typical)
Horizontal Frequency 24KHz --80KHz(analog), 31.5– 80KHz(digital) Vertical Frequency 56Hz ----75Hz
Plug & play : Support VESA DDC2B functions
Power Input voltage : Single phase, 50/60HZ, 100VAC to 240VAC ±10%
Total output power : 60 Watt max.
2.3 LCD Panel Specification
2.3.1 LCD Panel Model (FUJITSU FLC48SXC8V)
• Display Type active matrix color TFT LCD
• Resolution 1280 x 1024 pixels
• Display Dot 1280 x (RGB) x 1024
• Display Area 376.32mm(H) x 301.056mm(V)
• Pixel Pitch 0.098x3mm(H) x 0.294mm(V)
• Display Color 16777216
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• Lamp Voltage 700 Vrms typ.
• Lamp Current 7mA rms.( typ). 4 Lamp
• Weight 3200g .
• Optical Specifications
The following items are measured under stable conditions. The optical characteristics
should be measured in a dark room or equivalent state with the methods shown in Note(4).
Measuring equipment : TOPCON BM-5A, BM-7, PHOTO RESEARCH PR650
(Inverter Freq. : 54kHz) *Ta =25 ± 2°C, VDD=5V, fv=60 Hz, fDCLK=54 MHz, IL= 6.5mArms
Item Symbol Condition Min. Typ. Max. Unit Note
Contrast Ratio
(Center of screen)
Response
Time
Luminance of White
(Center of screen)
Color
Chromaticity
(CIE 1931)
Viewing
Angle
Brightness Uniformity
(9 points)
Rising TR - 15 30
Falling T
Red
Green
Blue
White
Hor.
Ver.
CR
F - 10 25
Y
L
Rx 0.648
Ry 0.346
Gx 0.292
Gy 0.602
Bx 0.150
By 0.130
Wx 0.313
Wy
θ
L
θ
R
φ
H
φ
L
UNI
B
Normal
φ θ
Viewing
Angle
CR≥10
T.B.D 500 -
= 0˚
= 0˚
70 - -
200 250 -
TYP.
-0.03
0.329
85 - -
85 - -
85 - -
85 - -
TYP.
+0.03
msec
cd/m2
Degrees
%
(1)(2)(4)
BM-5A
(1)(3)
BM-7
(5)
BM-5A
(1)(4)
PR650
(1)(4)
BM-5A
(6)
BM-5A
Note 1) Definition of Viewing Angle: Viewing angle range (10≤CR)
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Note 2) Definition of Contrast Ratio (CR): Ratio of gray max(Gmax),gray min(Gmin) at the
center point of panel.
Luminance with all pixels white (Gmax)
CR= 
Luminance with all pixels black (Gmin)
Note 3) Definition of Response time: Sum of TR , TF
7
Note 4) After stabilizing and leaving the panel alone at a given temperature for 30 min, the
measurement should be executed .Measurement should be executed n a stable, windless ,and dark room.30 min after lighting the back-light. This should be measured in the center of screen. Dual lamp current :13.0mA(6.5mA x2)(Refer to the note(1) in the page 14 for more information ).
Environment condition :Ta=25±2°C
Optical characteristics measurement setup
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Notes 5) Definition of Luminance of White : measure the luminance of white at center point.
Notes 6)Definition of 9 points brightness uniformity (Measuring points: Refer to the Note 5)
Bmin B
=100∗∗∗∗ 
UNI
Bmax
Bmax: Maximum brightness
Bmin: Minimum brightness
Notes 7) Definition of Flicker level
Flicker Voltage
pp
F =  x 100 % LMD Voltage
dc
♦♦♦♦ One maximum value of three estimated values. ♦♦♦♦ For this test ,an LMD(Light Measurement Device)is needed with adequate response time
to track any visible rate flicker component and with a voltage level output proportional To luminance intensity.
♦♦♦♦ Test Pattern: For dot inversion Driving(Gray levels of foreground dots on the test panel
Are G22,G32,and G45)
♦♦♦♦ Test Point :Center point of the display area
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Note 8) Definition of Crosstalk (Refer to the VESA STD)
The calculation for shadowing is made from the 2 luminance measurements Gbkg and Lsh, as follows:
Lmax -Lmin C
=  x100 %
T
Lmin
Where Lmax is the larger value of Gbkg or Lsh , and Lmin is the smaller of the two.
♦ To determine background and foreground levels (colors),first set the background to any
gray scale or color level suitable for shadowing determination.(Note that it may take several iterations of adjusting background level and box levels to determine the proper value for the background .Next display the box levels to determine the proper value for the background level. Look for shadowing in any direction from box E. Independently vary the gray level (or color) of the background and box E until the worst case shadowing is observed. This defines the background (Gbkg) and foreground (Gfg) levels to be maintained for the remainder of the test.
♦ One point only (the target) will be measured. To determine that point proceed as follows
Using the background and foreground gray levels of step1 (Gbkg and Gfg). Turn on each
box at a time. Look for the case with the worst shadowing. The box causing the worst case is the shadowing source, or Bsrc. Use Bsrc and the box opposite from it that lies directly in the shadow path. That is the target box, or Btgt. Note that box Eight be either Bsrc or Btgt, depending on the shadowing conditions, but typically Bsrc and Btgt will be a pair of opposite boxes, A&C or B&D. Btgt will only be displayed for aligning the LMD. It will be turned off for the actual measurement.
♦♦♦♦ The target box point (Btgt) will be measured with the source box (Bsrc) turned on then off.
(Btgt is for alignment purpose only) Display the background only at level Gbkg. Display Btgt determined in step 2 above. Using the correct distance, angle, and measurement aperture, align the LMD to the center of the Btgt. Turn off Btgt. With Gbkg set to its proper level, measure the luminance (or color). Next,turn on the source box Bsrc. Again measure at the center point of Btgt (without Btgt present.). In this case the LMD will be measuring the shadowing level, Lsh.
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2.4 Input Signals
2.4.1 Video input
• Type Analog R, G, B., Digital TMDS
• Input Impedance 75 ohm +/- 2%
• Polarity Positive
• Amplitude 0 - 0.7 +/- 0.05 Vp
• Display Color same as LCD panel
2.4.2 Sync input
• Signal separate horizontal and vertical sync, or composite sync
which are TTL compatible
• Polarity positive and negative.
2.4.3 Interface frequency
The following frequency range is generalized by supported timing. If the entered
mode does not match the supported timing the display optimization will not be
assured.
• Horizontal Frequency 24KHz --80KHz(analog), 31.5– 80KHz(digital)
• Vertical Frequency 56Hz ---------75Hz
DISPLAY MODES
MONITOR
MODE NO.
1 640x350 31.5 + 70.0 - 25.0 VGA 2 640X400 24.83 - 56.4 - 21.05 NEC 3 640X400 31.5- 70.0+ 25.0 VGA 4 640X400 31.5- 70.1- 25.19 NEC 5 640X480 31.5 - 60.0 - 25.0 Defacto 6 640X480 35.0- 66.67- 30.24 MAC 7 640X480 37.86- 72.80- 31.5 VESA 8 640X480 37.5- 75.0- 31.5 VESA
9 720X400 31.5 - 70.0 + 28.0 Text Defacto 10 832X624 49.72- 74.55 - 57.28 MAC 11 800X600 35.16+ 56.25+ 36.0 SVGA 12 800X600 37.8 + 60.0 + 40.0 VESA 13 800X600 48.07 + 72.18 + 50.0 VESA 14 800X600 46.87+ 75.0+ 49.5 VESA 15 1024X768 48.4 - 60.0 - 65.0 VESA 16 1024X768 53.96 + 66.13 + 71.66 XGA 17 1024X768 56.47 - 70.07 - 75.0 VESA 18 1024X768 60.0 + 75.0 + 78.75 VESA 19 1024x768 60.24- 75.02- 80.0 MAC-768 20 1280X1024 64.0 + 60.0 + 108.5 SXGA 21 1280X1024 80.0 + 75.0 + 135.0 Defacto
SCREEN
RESOLUTION
HORIZONTAL
SYNC RATE
(kHz)
VERTICAL
SYNC RATE
(Hz)
VIDEO CLK
(MHz)
STANDARD
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Supported Timing
TIMING
FV(HZ) POLARITY (DOT/LINE) (DOT/LINE) WIDTH PORCH PORCH FOREQ.(MHZ) (DOT/LINE) (DOT/LINE) (DOT/LINE)
640x350 31.469 + 800 640 96 16 48 25.175 VGA-350 70.087 – 449 350 2 37 60 640x400 24.83 – 848 640 64 64 80 21.05 NEC PC9801 56.42 – 440 400 8 7 25 640x400 31.469 – 800 640 96 16 48 25.175 VGA-GRAPH 70.087 + 449 400 2 12 35 640x400 31.5 – 800 640 64 16 80 25.197 NEC PC9821 70.15 – 449 400 2 13 34 640x480 31.469 – 800 640 96 16 48 25.175 VGA-480 59.94 – 525 480 2 10 33 640x480 35.00 – 864 640 64 64 96 30.24 APPLE MAC­480 640x480 37.861 – 832 640 40 16 120 31.5 VESA-480-72Hz 72.809 – 520 480 3 1 20 640x480 37.5 – 840 640 64 16 120 31.5 VESA-480-75Hz 75 – 500 480 3 1 16 720x400 31.469 – 900 720 108 18 54 28.322 VGA-400-TEXT 70.087 + 449 400 2 12 35 832x624 49.725 – 1152 832 64 32 224 57.2832 APPLE MAC­800 800x600 35.156 + 1024 800 72 24 128 36 SVGA 56.25 + 625 600 2 1 22 800x600 37.879 + 1056 800 128 40 88 40 VESA-600-60Hz 60.317 + 628 600 4 1 23 800x600 48.077 + 1040 800 120 56 64 50 VESA-600-72Hz 72.188 + 666 600 6 37 23 800x600 46.875 + 1056 800 80 16 160 49.5 VESA-600-75Hz 75 + 625 600 3 1 21 1024x768 48.363 – 1344 1024 136 24 160 65 XGA 60.004 – 806 768 6 3 29 1024x768 53.964 + 1328 1024 176 16 112 71.664 COMPAQ-XGA 66.132 + 816 768 4 8 36 1024x768 56.476 – 1328 1024 136 24 144 75 VESA-768-70Hz 70.069 – 806 768 6 3 29 1024x768 60.023 + 1312 1024 96 16 176 78.75 VESA-768-75Hz 75.029 + 800 768 3 1 28 1024x768 60.24 – 1328 1024 96 32 176 80 APPLE MAC­768 1280x1024 64 + 1688 1280 112 48 248 108 VESA-1024­60Hz 1280x1024 80 + 1688 1280 144 16 248 135 VESA-1024­75Hz
If the input timing is not a supported timing listed above but within the supported frequency range (Horizontal: 80KHz,Vertical: 75Hz), this monitor will select a closest mode instead. But the display quality may not be optimized. If the input timing over the supported frequency range, a message “Input Signal Out of Range” will be shown.
FH(KHZ) SYNC TOTAL ACTIVE SYNC FRONT BACK PIXEL
66.67 – 525 480 3 3 39
74.55 – 667 624 3 1 39
75.02 – 803 768 3 3 29
60 + 1066 1024 3 1 38
75 + 1066 1024 3 1 38
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2.4.4 85Hz refresh rate Support
Monitor should display 85Hz refresh rate mode as emergency mode. Monitor should display “Out of Range” warning menu at this mode.
2.4.5 Video input Connector
Analog Video input Connector: 15pins mini D-Sub
Table 2.4.5. Pin assignment for D-sub connector
PIN NO.
1 RED VIDEO 2 GREEN VIDEO 3 BLUE VIDEO 4 GROUND 5 GROUND 6 RED GROUND 7 GREEN GROUND 8 BLUE GROUND 9 PC5V (+5V DDC) 10 CABLE DETECTION 11 GROUND 12 SDA 13 H.SYNC 14 V.SYNC 15 SCL
Separate Sync
Color of plastic parts: Blue
5 1
10
15
D-sub connector
6
11
13
Digital Video input Connector: DVI-D (T.B.D)
Table 4-3-3. Pin assignment for DVI-D (24pin) connector
Pin – Assignment of DVI –D connector :
1 TX2- 9 TX1- 17 TX0-
2 TX2+ 10 TX1+ 18 TX0+
3 Shield (TX2 / TX4) 11 Shield (TX1 / TX3) 19 Shield (TX0 / TX5)
4 NC 12 NC 20 NC
5 NC 13 NC 21 NC
6 DDC-Serial Clock 14 +5V power *) 22 Shield (TXC)
7 DDC-Serial Data 15 Ground (+5V) 23 TXC+
8 No Connect 16 Hot plug detect 24 TXC-
*) In case, the power of the PC unit is switched off and the power of the monitor is switched on, no voltage may occur at pin 14.
14
2.5 CONTROLS
2.5.1 Control panel (monitor front panel)
1. Power LED, will be green when monitor is on; be amber when in power saving mode.
2. Adjust decrease.
3. Adjust increase.
4. Function select counter-clockwise.
5. Function select clockwise.
6. Power ON/OFF switch, push to ON and push to OFF. (toggle switch)
7. Ear phone jack.
8. Volume Control.
Note: When OSD Menu is off, press button 2 can activate “Auto Adjustment” immediately.
2.5.2 OSD Functions
• OSD Format: Refer to following figure.
• OSD Border: Cyan color
• OSD Tunable Item: The 16 icons that around the border.
• Selected Item: Yellow background
• Comment: Magenta foreground, Blue background
page format :
15
Description:
• Brightness: Brightness adjustment, the range from 0 to 100.
• Contrast: Contrast adjustment, the range from 0 to 100.
• H. Position: Horizontal position adjustment.
• V. Position: Vertical position adjustment.
• Phase: Focus adjustment, the range from 0 to 31,32 steps.
• OSD position: OSD position adjustment.
• Auto Adjustment: This feature will automatically adjust size, position, clock and phase.
It takes 3-5 seconds to finish. When auto start, it shows “Auto Adjusting….” message.
• Clock: Frequency tracking adjustment. The max range from -48 to +48, but
some modes the range will be limited.
• Graph Text: 640x400(GRAPH) or 720x400(TEXT) mode select.
• Language: 5 kinds of language for description, including (English, German,
French, Spanish, Italian)
• Recall: Recall the default value.
• Color Temp: Color temperature for standard 9300,6500, 7500 or user defined.
User:
User R: Red signal gain by user defined.
User G: Green signal gain by user defined.
User B: Blue signal gain by user defined.
7500: Set CIE coordinate at 7500°K color temperature. 6500: Set CIE coordinate at 6500°K color temperature. 9300: Set CIE coordinate at 9300°K color temperature.
• Exit: Exit OSD menu function.
Sharpness : Adjust the scale-up effect(smoother or sharper.)
OSD Transparency: Adjust the transparency level of OSD. The range is from 0 to 100 scales.
Comment:
• 1280x1024: Current mode resolution.
• 60 HZ: Current mode vertical frequency±1Hz.
• VER 1.00: Firmware revision.
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Other features:
Intellectual-Auto AL922(AM999) can start the Auto-Adjustment automatically when input
a new display mode at first time. After the adjustment, AL922(AM999) will remember this mode and switch to optimized condition automatically for this mode whenever encounter this mode again. Total 21 recent used modes are recorded into AL922(AM999)
VESA DPMS Functionality When signaled by the host CPU, AL922(AM999) show a
black screen about 3 seconds. If no further signal, then it shows “No Signal” and enter power saving mode.
2.6 White Color Temperature
White color temperature is 4 preset as 9300, 7500,6500 and User, Default value of user color should be user which is maximum setting for panel.
Target of color setting
Color
Temp.
9300K 0.283 0.297 +0.03 0.189 0.446 u’v’ < 0.01* 7500K 0.299 0.315 +0.03 0.194 0.459 u’v’ < 0.01* 6500K 0.313 0.329 +0.03 0.198 0.469
User - - - - -
User should follow “Microsoft Windows Color Quality Specification for Liquid Crystal Display OEM’s”. (http://www.microsoft.com/hwdev/tech/color/ColorTest.asp)
Color Coordinate Tolerance Color Coordinate Tolerance
x y u’ v’
*) TCO’0X A.2.6.1 requirement
u’v’ <
0.01*
17
2.7 POWER SUPPLY
2.7.1 input Voltage Range
The monitor shall operate within specification over the range of 90 to 265 VAC power supply.
2.7.2 Input Frequency Range
Input power frequency range shall be from 47.5 to 63 Hz over the specified input voltage range.
2.7.3 Quick specification review
• Input current
1.5A (max) at 90VAC input and full load ,
0.75A (max) at 264 VAC input and full load.
• Inrush current @ cold start
30A(0-peak)@ 110Vac ,50A(0-peak) @ 220Vac (measured when switched off for at least 10 mins.)
• Output
Tolerance Output Current
Output Volt - MIN MAX
Volt Tolerance
+12Vdc
• Total output power: 60 Watt max.
• Withstanding voltage : 1.5Kvac or 2.2KVdc for 1 minute.
• Leakage current : < 0.25mA/100Vac , <3.5mA/230Vac
• Efficiency : 80% min. @115V/230VAC, maximum load.
2.7.4 Power Management
2.7.4.1 Meet VESA DPMS proposal
The monitor must comply with the Microsoft On Now specification, with a minimum of three power management states, as defined by the VESA DPMS document. The front panel of the monitor must appropriately display the DPMS state, For example:
DPMS ON : The power LED is Green
DPMS OFF : The power LED is Amber
2.7.5 Power Consumption
On mode 56 Wmax Green Off mode 4 Wmax Amber
DC power off 4 Wmax Dark
disconnection 4 Wmax
Power saving states are measured with speakers attached but not worked. The recovery time from off mode to on mode is 3 seconds maximun.
±5%
0A 5A 11.4~12.6Vdc
Dark (DC power off) Amber (DC power on)
2.7.6 Power Connector
All units shall have an IEC/CEE-22 type male power receptacle.
2.8 Plug & Play(EDID)
The monitor will be capable of sending a VESA standardized EDID file through the DDC (pins 12, 15 of the VGA connector).
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2.9 Audio Technical specification
2.9.1 General Description:
Output power : 1W + 1W maximum
Total harmonic distortion : Less than 1 % (except speakers distortion)
Input signal sensitivity : 0.5 Vrms for full output
Input impedance : 47 Kohm +/- 5 %
Frequency response range : 20Hz – 20kHz (except speakers response)
Difference of L and R output : Less than 2 dB
2.9.2 Electrical characteristics (Tamb=25
°°°°
)
Audio amplifier(USE Panasonic VP-7723A Audio Analyzor. )
Spec. Item Audio Input Freq.
Comment
Min. Typ. Max.
Input Voltage(V) - 5 - Input Current(m A) - 500 800 Audio Voltage Gain 500m Vrms 1KHz - - 6 d B Volume Max.,load 4 Ω Frequency Response 500m Vrms 300Hz-20KHz -10dB - +10d B Volume Max.,load 4 Ω Signal to Noise ratio 500m Vrms 1KHz - - -40dB Volume Max.,load 4 Ω Total harmonic distortion 500m Vrms 1KHz 1% except speakers distortion Cross talk 500m Vrms 1KHz - - -30dB Volume Max.,load 4 Ω Output Watt. 500m Vrms 1KHz - - 1W Volume Max.,load 4 Ω Volume Control - - - Analog
2.9.3 Speakers
Maximum power : 2 W per speaker(max)
Impedance : 4 ohm +/- 15 % @ 1kHz 1.0Hz
Frequency response range : 350 Hz – 15 kHz (S.P.L. – 10 dB)
Total harmonic distortion : Less than 5 % @ 0.125 W 1kHz
2.9.4 Headphone output
Output power : 1.6 mW for 32 ohms Headphone
19
3. VL-901 DISPLAY CONTROL BOARD
3.1 Description
The VL-901 display control board is design to directly convert the analog RGB signals from standard VGA display card to optimum LCD timing signals so as to construct a high display quality LCD monitor.
3.2 Features
On board embedded micro-processor to detect display timings and control user
•
functions.
• Using Genesis gm5120 design to generate optimum LCD timings.
2
• Using E
• support up to 22 display modes from VGA to SXGA.
• Offer full screen expansion function on non-SXGA mode (automatic).
• flexible color temperature selection function including 9300,6500,7500 and user
mode.
PROM to memorize every adjusted parameter.
• Support OSD functions.
• Support VESA DPMS function.
• Support DDC2B functions.
• Support 5 languages for OSD description.
• The longest time for mode change is 3 seconds.
20
3.3 BLOCK DIAGRAM
21
3.4 Connector Locations
3.5 Connector Type
Location Type Maker Number of pins
CN1 74320-4004 MOLEX 24 CN2 1211-15 E&T 15 CN4 6905-40 E&T 40 J1 4300-10 E&T 10 J2 4500-07 E&T 07
3.6 Connector pin assignment
3.6.1 CN2
Pin NO. Signal Comment
1 R-Video Red Video Input. 2 G-Video Green Video Input. 3 B-Video Blue Video Input. 4 N. C. 5 Ground Ground. 6 Ground Ground. 7 Ground Ground. 8 Ground Ground 9 5VCC DDC Power Input. 10 PCDETECT PCDETECT Input. 11 NC NC 12 SDA DDC 2B 13 HS Horizontal Sync Input. 14 VS Vertical Sync Input. 15 SCL DDC 2B
22
3.6.2 CN4
Terminal No. Symbol Function
36,37,38 VDD 5V POWER S UP PLY
1 TXE0- LVDS EVEN OUTPUT DATA PAIRS 2 TXE0+ LVDS EVEN OUTPUT DATA PAIRS 4 TXE1- LVDS EVEN OUTPUT DATA PAIRS 5 TXE1+ LVDS EVEN OUTPUT DATA PAIRS 7 TXE2- LVDS EVEN OUTPUT DATA PAIRS
8 TXE2+ LVDS EVEN OUTPUT DATA PAIRS 10 TXECLK- LVDS EVEN OUTPUT DATA PAIRS 11 TXECLK+ LVDS EVEN OUTPUT DATA PAIRS 13 TXE3- LVDS EVEN OUTPUT DATA PAIRS 14 TXE3+ LVDS EVEN OUTPUT DATA PAIRS 16 TXO0- LVDS ODD OUTPUT DATA P AIRS 17 TXO0+ LVDS ODD OUTPUT DATA PAIRS 19 TXO1- LVDS ODD OUTPUT DATA PAIRS 20 TXO1+ LVDS ODD OUTPUT DATA PAIRS 22 TXO2- LVDS ODD OUTPUT DATA P AIRS 23 TXO2+ LVDS ODD OUTPUT DATA PAIRS 25 TXOCLK- LVDS ODD OUTPUT DATA PAIRS 26 TXOCLK+ LVDS ODD OUTPUT DATA PAIRS 28 TXO3- LVDS ODD OUTPUT DATA P AIRS 29 TXO3+ LVDS ODD OUTPUT DATA PAIRS
03,06,09, 12 GND Ground 15, 18, 21, 24 GND Ground 27, 30, 34, 35 GND Ground
39,40 GND Ground
3.6.3 J2
Pin NO. Signal Comment
1,2 5 VCC 5V Power Input 3,4,5 GND GND 6 BLON Bright Light ON/OFF. 7 BRIGHT Brightness Adjustment.
23
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