Acer AL501 User manual

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1.ELECTRICAL REQUIREMENTS.................................................................................... 2
A. LCD Panel Specification............................................................................................................................2
B. Controls.....................................................................................................................................................3
C. Power Management ..................................................................................................................................3
D.Display Modes FOR Inspections...............................................................................................................5
2.ADJUSTMENT CONDITIONS......................................................................................... 6
A. Measuring Apparatuses Used...................................................................................................................6
B. Input Signal................................................................................................................................................6
C.Indication ...................................................................................................................................................6
3.ADJUSTMENT OF POWER SUPPLY ...................................................................... 6
A. Adjustment of Switching Regulator (Adapter) ...........................................................................................6
4.ADJUSTMENT OF BOARDS.......................................................................................... 7
A. Connection Method ...................................................................................................................................7
5.VL-531 DISPLAY CONTROL BOARD............................................................................ 7
A. Description.................................................................................................................................................7
B. Features ....................................................................................................................................................7
C.Block Diagram (Control Ckt)......................................................................................................................8
D.Connector Locations..................................................................................................................................9
E. Connector Type.........................................................................................................................................9
F. Connector Pin Assignment......................................................................................................................10
6.VK-531 CONTROL PANEL BOARD............................................................................. 14
A. Description...............................................................................................................................................14
B. Connector and Switch Locations.............................................................................................................14
C.Connector type........................................................................................................................................14
D.Connector pin Assignment......................................................................................................................15
7.VP-531 POWER BOARD.............................................................................................. 17
A. Description...............................................................................................................................................17
B. Electrical characteristics..........................................................................................................................17
C.Connector locations.................................................................................................................................18
8.CIRCUIT DESCRPTION ............................................................................................... 20
A. Micro-Controller Circuit............................................................................................................................20
B. Circuit of Plug and Play...........................................................................................................................20
C.System Clock...........................................................................................................................................20
D.Image Engine (Zoom)..............................................................................................................................20
E. Power Regulator......................................................................................................................................20
9.INTRODUCTION........................................................................................................... 21
A. Front Panel Control And Led...................................................................................................................21
B. Rear Panel Connector Input Signals.......................................................................................................22
10.TROUBLESHOOTING................................................................................................. 23
A. Main Procedure.......................................................................................................................................23
APPENDIX A: PARATS LISTS……………..…………………………………………………..28
APPENDIX B: DISPLAY UNIT ASSEMBLY…………………………………………………..35
APPENDIX C: P.C.B.A ASSEMBLY…………………………………………………………...40

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1. ELECTRICAL REQUIREMENTS
A. LCD Panel Specification
Display: 15 inch (15” viewable image size): active matrix: thin film transistor
(TFT): liquid crystal display (LCD): 0.297 mm dot pitch: R.G.B.
Vertical stripe 200 cd//m2 white luminance, typical: 300:1 contrast
ratio, typical
Compatibility: 640 x 350: VGA-350
720 x 400: VGA text
640 x 400: VGA-GRAPH
640 x 480: VGA, 60Hz to 75 Hz vertical refresh rate
800 x 600: 56Hz to 75 Hz vertical refresh rate
1024 x 768 non-interlaced: 60Hz to 75 Hz vertical refresh rate
Synchronization
Frequencies: Horizontal: 24 kHz to 60 kHz
Vertical: 56 Hz to 75 Hz (1024 x 768 is up to 75 Hz)
Pixel Frequency: 21 Mhz to 78 Mhz
Resolution: Horizontal: 1024 dots
Vertical: 768 lines
Active Display Area: Horizontal: 304.1 mm
Vertical: 228.1 mm
Viewing Angles: Up 40deg down 45deg (TYP)
Left 60deg, Right 60deg (TYP)
CR > 10
Display Colors: 6-bits driver
Power Supply: AC 100 to 240V worldwide input, 50 / 60Hz
Power
Consumption: Typical: 25W on mode +10 / -25%
Environmental: Operating temperature: 0ºC to 50ºC
Storage temperature: -20ºC to 65ºC
Storage humidity: 10%~90%

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B. CONTROLS
B-1 Control panel (monitor front panel)
1. Power LED, ( Please refer to C-2 LED definition table)
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)
C. Power Management
C-1 Power Management condition and status
State Signals Power Video LCD LED
Horizontal Vertical Video Supply Circuit
On Pulses Pulses Active On On On Green
Stand-by No Pulses Pulses Blanking Off Off Yellow
Suspend Pulses No Pulses
Off No pulses No pulses Blacking On Yellow
DC Power off Don’t care Don’t care Don’t care Off Off Off Off

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C-2 LED definition Table
State LED
On mode Green
Stand-by Yellow
Suspend Yellow
Off mode Yellow
DC power off Dark
disconnection 1. Yellow(stand-by; suspend; off mode)
2. LED Dark (DC power off)
C-3 Power Consumption
Meet VESA DPMS Proposal
On mode 25 Wmax
Stand-by 5 Wmax
Suspend 5 Wmax
Off mode 5 Wmax
DC power off 5 Wmax
disconnection 5 Wmax
Measured from AC input end of AC power adapter, and not include audio at power-saving state
The stand-by, suspend and off mode recover to on mode about 3 seconds.

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D. Display Modes FOR Inspections
D-1 Supported Timing(for Not supported timing will go to power saving mode)T
TIMING FH(KHZ)
FV(HZ)
SYNC
POLARITY
TOTAL
(DOT/LINE)
ACTIVE
(DOT/LINE)
SYNC
WIDTH
(DOT/LINE)
FRONT
PORCH
(DOT/LINE)
BACK
PORCH
(DOT/LINE)
PIXEL
FOREQ.
(MHZ)
31.469 [phone] 25.175
640x350
VGA-350 70.087 −449 350 2 37 60
24.83 −848 640 64 64 80 21.05
640x400
NEC PC9801 56.42 −440 400 8 7 25
31.469 −800 640 96 16 48 25.175
640x400
VGA-GRAPH 70.087 [phone]
31.5 −800 640 64 16 80 25.197
640x400
NEC PC9821 70.15 −449 400 2 13 34
31.469 −800 640 96 16 48 25.175
640x480
VGA-480 59.94 −525 480 2 10 33
37.861 −832 640 40 16 120 31.5
640x480
VESA-480-72Hz 72.809 −520 480 3 1 20
37.5 −840 640 64 16 120 31.5
640x480
VESA-480-75Hz 75 −500 480 3 1 16
31.469 −900 720 108 18 54 28.322
720x400
VGA-400-TEXT 70.087 [phone]
35.156 [phone] 36
800x600
SVGA 56.25 [phone]
37.879 [phone] 40
800x600
VESA-600-60Hz 60.317 [phone]
48.077 [phone] 50
800x600
VESA-600-72Hz 72.188 [phone]
46.875 [phone] 49.5
800x600
VESA-600-75Hz 75 [phone]
49.725 - 1152 832 64 32 224 57.2832
832x624
APPLE MAC-800 74.55 - 667 624 3 1 39
48.363 −1344 1024 136 24 160 65
1024x768
XGA 60.004 −806 768 6 3 29
53.964 [phone] 112 71.664
1024x768
COMPAQ-XGA 66.132 [phone]
56.476 −1328 1024 136 24 144 75
1024x768
VESA-768-70Hz 70.069 −806 768 6 3 29
60.023 [phone] 78.75
1024x768
VESA-768-75Hz 75.029 [phone]

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2. ADJUSTMENT CONDITIONS
A. Measuring Apparatuses Used
Necessary measuring equipment that for the adjustment of LA-1221JMW’s MAIN PWB are
following items.
Adjusted Video Generator.
Oscilloscope (more than 4 channels required)
DC voltmeter
B. Input Signal
Input signal by using video signal generator with VGA Card port for this adjustment.
C. Indication
Input signal by using video signal generator with VGA Card port for this adjustment.
3. ADJUSTMENT of Power Supply
A. Adjustment of Switching Regulator (Adapter)
A-1 Specifications
Input voltage AC 100 ~ 240Vac
Rated input voltage AC 90 ~ 264Vac
Frequency 50 / 60 Hz
Rated frequency 47 ~ 63 Hz
DC output
Out voltage +12V
Maximum output current 3.33A
Minimum output current 0A
Range of voltage Regulation ±5%

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4. ADJUSTMENT OF BOARDS
Equipment is connected with boards to be inspected before adjustments. Refer to diagram
below.
A. Connection Method
1. R.G.B Signal Cable
2. DC Power Cable
3. Inverter Cable
4. Control Cable
5. LCD Lamp Cable
5. VL-531 DISPLAY CONTROL BOARD
A. Description
The VL-531 display control board is design to directly convert the R.G.B signals from VGA
Card D-sub port to optimum LCD timing signals so as to construct a high display quality LCD
monitor.
B. Features
• On board sage chip to detect display timings and control user functions.
• Using sage chip to convert R.G.B signals to digital timing
• Using sage chip to offer full screen expansion function on non-XGA mode(Auto-Zoom).
• Support VESA DPMS function.
• Support DDC2B functions.

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C. Block Diagram (Control CKT)
C-1 Sage Operation
The s9050-100 is highly-integrated display processors. It has an ADC/PLL block and a
microprocessor integrated on a single chip. The cost-effective s9050-100 is suitable for the
XGA and the s9050 for the SXGA market segment with smaller memory requirements. Other
features include a brand new high-end scaler, Active Color Management, a flexible OSD,
Autoadjust, SureSyncTM and independent monitoring of the analog interface. A new standalone
on-chip pattern generator has been incorporated to simplify the manufacture of monitors.

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D. Connector Locations
E. Connector Type
Location Type Maker Number of pins
CN1 DZ11A91-L8 P1.524 FEMALE 15
J2 96113-1003 E&T 10
J3 96113-0703 E&T 7
CN3 98210-4011 E&T 40
CN2 98210-4011 E&T 40

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F. Connector pin assignment
F-1 CN1
Pin NO. Signal Comment
1 R-Video Red Video Input.
2 G-Video Green Video Input.
3 B-Video Blue Video Input.
4 Ground Ground
5 Ground Ground
6 Ground Ground.
7 Ground Ground.
8 Ground Ground
9 5V-DCC DDC Power Input.
10 NC NC
11 Ground Ground
12 DDC-SDA DDC 2B Data
13 HS Horizontal Sync Input.
14 VS Vertical Sync Input.
15 DDC-SCL DDC 2B Clock