AOC VS19X Series User manual

HP VS19X Service Manual
SERVICE MANUAL
19” LCD Monitor
VS19X Series
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY
REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE
CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF
PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

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Table of Contents
Table of Contents ---------------------------------------------------------------------------------- 02
Revision List ---------------------------------------------------------------------------------------- 04
1.Product Feature --------------------------------------------------------------------------------05
2.LCD Monitor Description -----------------------------------------------------------------------06
3.Operation Instructions --------------------------------------------------------------------------07
3.1 General Instructions -----------------------------------------------------------------------07
3.2 Control Button -------------------------------------------------------------------------------07
3.3 Adjusting The Picture ------------------------------------------------------------------------09
4. Input/Output Specification ---------------- --------------------------------------------------- 10
4.1 Input Signal Connector -------------------------------------------------------------------10
4.2 Factory Preset Display Modes ----------------------------------------------------------11
4.3 Power Supply Requirements ------------------------------------------------------------11
5.Panel Specification ----------------------------------------------------------------------------12
5.1 General Feature ----------------------------------------------------------------------------12
5.2 Optical Characteristics --------------------------------------------------------------------13
6. Block Diagram -----------------------------------------------------------------------------------14
6.1 Monitor Exploded View ------------------------------------------------------------------14
6.2 Software Flow Chart -----------------------------------------------------------------------15
6.3 Electrical Block Diagram ------------------------------------------------------------------16
6.3.1 Scalar Board ---------------------------------------------------------------------------16
6.3.2 Inverter/Power Board ----------------------------------------------------------------17
7. Schematic -----------------------------------------------------------------------------------------20

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7.1 Main Board -----------------------------------------------------------------------20
7. 2 Audio Board ----------------------------------------------------------------------27
7. 3 Power Board ---------------------------------------------------------------------28
8. PCB Layout ---------------------------------------------------------------------------------------31
8.1 Main Board -----------------------------------------------------------------------------------31
8.2 Power Board ---------------------------------------------------------------------------------32
8.3 Keypad Board -------------------------------------------------------------------------------33
9. Maintainability ------------------------------------------------------------------------------------33
9.1 Equipments and Tools Requirements -------------------------------------------------33
9.2 Trouble Shooting ---------------------------------------------------------------------------34
9.2.1 Main Board ------------------------------------------------------------------------34
9.2.2 Power/Inverter Board -------------------------------------------------------------37
9.2.3 Key Pad Board -----------------------------------------------------------------------39
10. White-Balance, Luminance Adjustment ----------------------------------------------- 40
11.Check List after replacing LCD Main board-------------------------------------------------41
12. EDID Content -----------------------------------------------------------------------------------45
13. BOM List ----------------------------------------------------------------------------------46～61
13.1 T982KH4DBHHAA -----------------------------------------------------------------46～61

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Revision List
Revision Date Change Description
A00 Nov-20-05 Initial release

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Product Feature
LCD Panel
Driving system TFT Color LCD
Panel M190EN04 V5
Size 48.3cm(19.0")
Pixel pitch 0.294mm( H )x 0.294mm( V )
Viewable angle 140˚(H) 130˚(V)
Response time (typ.) 16 ms
Brightness 250
Contrast 400:1
Video Analog /Digital
Input
Sync. Type H/V TTL
H-Frequency 30kHz – 83kHz
V-Frequency 50-76Hz
Display Colors Over 16 million Colors
Dot Clock 140MHz
Max. Resolution 1024 x768
Plug & Play VESA DDC2BTM
Power Consumption
ON Mode <45W
OFF Mode <1W
Maximum Screen Size Horizontal : 300mm
Vertical : 220 mm
Power Source 100~240VAC,47~63Hz
Environmental
Considerations
Operating Temp: 5°C to 35°C
Storage Temp.: -20°C to 60°C
Operating Humidity : 20% to 80%
Main Dimensions
Packaged(W*H*D) 525mm*175mm*535mm
Unpackaged(W*H*D) 426mm*423mm*204mm
Weight (N. W.)
Packaged 6.8Kg Unit
Unpackaged 5.3Kg Unit

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2. LCD Monitor Description
The LCD Monitor will contain main board, power board, key board, Audio board and which house the flat panel control
logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
Power Board
Flat Panel and
CCFL backlight
Main Board
Keyboard
RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFT Drive.
AC-IN
100V-240V Video signal, DDC
Monitor Block Diagram
Audio board

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3. OPERATION INSTRUCTIONS
3.1 General Instructions
The control buttons are located at the left side of monitor, and press the power button to turn the monitor on or off. By
changing these settings, the picture can be adjusted to your personal performance.
-The power cord should be connected and insert to adaptor.
-Connect the video cable from the monitor to the computer VGA card.
-Press the power button to turn on the monitor, the power indicator will light up to Green.
3.2 Control Buttons
CONTROL BUTTONS

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3.3 Adjust The Picture
1.
Brightness
Adjust the brightness.
2. Contrast Adjust the contrast
3. Image Control
Adjust the:
zAuto Adjustment: Adjusts the main settings and produces a stable, centered
image.
zH-Position: horizontal position of the screen image.
zV-Position: vertical position of the screen image.
zClock: frequency of the pixel clock to minimize vertical bar.
zPhase: phase value to minimize horizontal jitters.
4. Volume Adjust the volume
5. Color
z9300K: recall 9300K color
z6500K: recall 6500K color
zSRGB: recall SRGB color
zCustom Color: adjusts the color tint of white, and the red, green, and blue (RGB)
mix for colors.
6. Language Shows the language of the OSD window.
7. Management
zPower Saver: enable/disable power saving
zPower On Recall: enable/disable power recall
zMode Display: enable/disable mode display
zSleep Timer: set sleep timer
zBasic Menu: set to basic menu
8. OSD Control OSD (on Screen Display) settings: adjusts the H/V position, timeout, On Screen
Display window.
9. Information Current setting, recommended setting, serial number, total hours, backlight hours, Exit.
10. Factory Reset Resets the display to original factory settings for color, brightness, phase, and clock.
11. Exit Exit the current OSD window.

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4. Input/Output Specification
4.1 Input Signal Connector
PIN MNEMONIC SIGNAL
1 RV Red Video
2 GV Green Video
3 BV Blue Video
4 NC
PC Connect detection
5 GND Ground (DDC Return)
6 RG Red GND
7 GG Green GND
8 BG Blue GND
9 +5 V +5 V (from PC)
10 SG Sync Ground
11 NC None
12 SDA DDC Data
13 HS Horizontal Sync
14 VS Vertical Sync
15 SCL DDC Clock
VGA connector layout
PIN 1 PIN 5
PIN 11

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4.2 Factory Preset Display Modes
Prese
t
Pixel
Format
Horz Freq
(KHz)
Horz
Polarity
Vert Freq
(Hz)
Vert
Polarity
Pixel Clk
(MHz) Source
1 640 x 480 31.469 - 59.940 - 25.175 VGA
2 640 x 480 37.861 - 72.809 - 31.500 VESA
3 640 x 480 37.500 - 75.000 - 31.500 VESA
4 720 x 400 31.469 - 70.087 + 28.322 VGA
5 800 x 600 37.879 + 60.317 + 40.000 VESA
6 800 x 600 48.077 + 72.188 + 50.000 VESA
7 800 x 600 46.875 + 75.000 + 49.500 VESA
8 832 x 624 49.726 ± 74.551 ± 57.284 MAC
9 1024 x 768 48.363 - 60.004 - 65.000 VESA
10 1024 x 768 56.476 - 70.069 - 75.000 VESA
11 1024 x 768 60.023 + 75.029 + 78.750 VESA
12 1152 x 870 68.68 - 75.06 - 100.000 Mac
13 1152 x 900 71.71 - 76.05 - 105.561 Sun
14 1280 x 1024 63.98 + 60.02 + 108.000 VESA
15 1280 x 1024 79.97 + 75.02 + 135.000 VESA
4.3 Power Supply Requirements
PARAMETER RANGE
AC Input Voltage 90 to 265V
AC Input Frequency 47 to 63 Hz
Inrush Current 50A MAX AT 220VAC and 30A AT 120VAC
Leakage Current 5 mA MAX at 120VAC
Power Consumption ≤45W

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5 PANEL SPECIFICATION
5.1 General Feature
The following items are characteristics summary on the table under 25 condition:℃
ITEMS Unit SPECIFICATIONS
Screen Diagonal [mm] 480 (19.0" )
Active Area [mm] 376.32 (H) x 301.06 (V)
Pixels H x V 1280(x3) x 1024
Pixel Pitch [mm] 0.294 (per one triad) x 0.294
Pixel Arrangement R.G.B. Vertical Stripe
Display Mode Normally White
White Luminance ( Center ) [cd/m2] 270 (center, Typ) @ 7mA
Contrast Ratio 550 : 1 (Typ)
Optical Response Time [msec] 8 ms(Typ, on/off)
Color Saturation 72% NTSC
Nominal Input Voltage VDD [Volt] +5.0 V
Power Consumption
(VDD line + CCFL line)
[Watt]
28W(Typ)
(w/o Inverter, All black pattern)
Weight [Grams] 2700 (Max)
Physical Size [mm] 396 (H) x 324 (V) x 18 (D)(Typ)
Electrical Interface Dual channel LVDS
Support Color 16.2M colors (RGB 6-bit data+FRC data)
Temperature Range
Operating [oC] 0 to +50
Storage (Shipping) [oC] -20 to +60
TCO’03 compliance TCO’03 compliance
Surface Treatment Hard-coating (3H), Non-Glare treatment
RoHS RoHS Compliance

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5.2 Optical Characteristics
The optical characteristics are measured under stable conditions at 25 (Room Temperature):℃
Item Unit Conditions Min. Typ. Max.
Viewing Angle [degree]
[degree]
Horizontal (Right)
CR = 10 (Left)
65 65 70 70
--
[degree]
[degree]
Vertical (Up)
CR = 10 (Down)
70 55 75 60
--
Contrast ratio Normal Direction 350 550
Response Time [msec] Raising Time - 5.6 8.4
[msec] Falling Time - 2.4 3.6
[msec] Rising + Falling - 8 12
Color / Chromaticity
Coordinates (CIE)
Red x 0.604 0.634 0.664
Red y 0.324 0.354 0.384
Green x 0.257 0.287 0.317
Green y 0.591 0.621 0.651
Blue x 0.108 0.138 0.168
Blue y 0.047 0.077 0.107
Color Coordinates (CIE) White White x 0.283 0.313 0.343
White y 0.299 0.329 0.359
White Luminance at CCFL
7.0mA (central point)
[cd/m2] 215 270 -
Luminance Uniformity [%] 70 75 -
Crosstalk (in75Hz) [%] 1.5
Flicker DB -20

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6. Block Diagram
6.1 Monitor Exploded View

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6.2 Software Flow Chart
1) MCU initialize.
2) Is the eeprom blank?
3) Program the eeprom by default values.
4) Get the PWM value of brightness from
eeprom. Check the pin PANEL1 and PANEL2
to tell which panel to get with it.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Saving the power key status into eeprom.
Turn on the LED and set it to green color.
Scalarinitializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog and digital port, are there
any signals coming?
13) Does the scalar send out a interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog or
digitalport?
16) Display " No Input Signal " message. And go
into standby mode after the message
disappear.
17) Program the scalar to be able to show the
coming mode.
18) ProcesstheOSDdisplay.
19) Read the keyboard. Is the power key
pressed?
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
1
5
Y
N
16
1
7
19
Y
N
18

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6.3 Electrical Block Diagram
6.3.1 Scalar Board Block Diagram
OSD Control
Interface
(CN602)
MST8116B
(Include SCALAR, ADC, OSD)
(U401)
MCU
W78E65P-40
(U601)
DB15_SDA,
DB15_SCL
LCD Interface
(CN503)
EEPROM
24C16
(U602)
D-Sub
Connector
(CN301)
EEPROM
24C02
(U301)
H sync
V sync
RGB
RXD
TXD
EPR_SDA
EPR_SCL

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6.3.2 Inverter / Power Board Block Diagram
Inverter Block Diagram

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Power Block Diagram

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7.Schematic
7.1. Main Board
ESP
BA[0..5]
TOP
A
AOC SCHEMATIC FOR HPQ2005
B
17Monday, September 13, 2004
Title
Size Document Number Rev
Date: Sheet of
PB[0..9]
5V
B2
4.SCALER
RIN
GIN
SOG
BIN
GNDR
GNDG
GNDB
HSYNC
VSYNC
CSZ
SCL
SDA
HWRESET
INT
VOLUME
AdjBACKLITE
PA[0..9]
VCC1.8
VCC3.3
VAA1
VAA2
VAA3
VAA4
AD0
AD1
AD2
AD3
PB[0..9]
GA[0..3]
BA[0..5]
ESP
GPO[0..4]
OSP
VAA2
VLCD_12V
VCC1.8
B3
6.MCU
onBACKLITE
onPANEL_5V/3.3V
SDA
INT
CSZ
DDC_DAT
ST_DET1
SCL
HWRESET
DDC_CLK
VCPU
RXD
TXD
AD0
AD1
AD2
AD3
AUDIO_SD
ROUT+1
OUT-L+
onPANEL_12V
LOUT+1
OUT-R-
OUT-R+
OUT-L-
DDC_WP
VLCD
VCC1.8 VAA2
VAA3
VCC3.3
VAA4
SCHEMATIC
5V
PA[0..9]
VAA1
B1
3.INPUT
RIN
GIN
BIN
VSYNC
GNDR
GNDG
GNDB
ST_DET1 HSYNC
SOGDDC_CLK
DDC_DAT
TXD
RXD
DDC_WP
VCPU
GPO[0..4]
GA[0..3]
VAA1
VLCD
VCC5V
B6
7.AUDIO
VOLUME
OUT-R-
OUT-R+
OUT-L+
OUT-L-
LOUT+1
ROUT+1
VCC5V
AUDIO_SD
GND
5V
HPQ2005
B5
5.PANEL INTERFACE
VLCD
PA[0..9]
GPO[0..4]
PB[0..9]
OSP
ESP
GA[0..3]
BA[0..5]
VLCD_12V
B4
2.POWER
onPanel_5V/3.3V
onBACKLITE
AdjBACKLITE
VCC3.3
VCC1.8
VAA1
VAA2
VAA3
VAA4
VLCD
VCPU
VLCD_12V
onPanel_12V
VCC5V
GND
5V
VAA4
OSP
FOR
VLCD_12V
VCC3.3
VCC5V
VCPU
VAA3