AOC VS19T Service Manual
HP VS19T
SERVICE MANUAL
19” LCD Monitor
VS19T
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.
1
HP VS19T
Table of Content
Revision List ---------------------------------------------------------------------------------------------------------------------------- 03
1.Monitor Specification -------------------------------------------------------------------------------------------------------------- 04
2.LCD Monitor Description --------------------------------------------------------------------------------------------------------- 05
3.Operation Instructions ------------------------------------------------------------------------------------------------------------ 05
3.1 General Instructions ------------------------------------------------------------------------------------------------------------ 05
3.2 Control Button ------------------------------------------------------------------------------------------------------------------- 06
3.3 Adjusting The Picture ---------------------------------------------------------------------------------------------------------- 07
4. Input/Output Specification ------------------------------------------------------------------------------------------------------ 08
4.1 Input Signal Connector -------------------------------------------------------------------------------------------------------- 08
4.2 Factory Preset Display Modes ---------------------------------------------------------------------------------------------- 09
4.3 Power Supply Requirements ------------------------------------------------------------------------------------------------- 09
5.Panel Specification ------------------------------------------------------------------------------------------------------------------- 10
5.1 General Feature ----------------------------------------------------------------------------------------------------------------- 10
5.2 Optical Characteristics --------------------------------------------------------------------------------------------------------- 11
6. Block Diagram ---------------------------------------------------------------------------------------------------------------------- 12
6.1 Monitor Exploded View ------------------------------------------------------------------------------------------------------- 12
6.2 Software Flow Chart ------------------------------------------------------------------------------------------------------------ 13
6.3 Electrical Block Diagram ------------------------------------------------------------------------------------------------------- 15
6.3.1 Scalar Board ---------------------------------------------------------------------------------------------------------------- 15
6.3.2 Inverter/Power Board ----------------------------------------------------------------------------------------------------- 16
7. Schematic ---------------------------------------------------------------------------------------------------------------------------- 17
7.1Main Board ---------------------------------------------------------------------------------------------------------------------- 17
7.2 Power Board -------------------------------------------------------------------------------------------------------------------- 24
8. PCB Layout -------------------------------------------------------------------------------------------------------------------------- 27
8.1 Main Board ----------------------------------------------------------------------------------------------------------------------- 27
8.2 Inverter/Power Board ----------------------------------------------------------------------------------------------------------- 28
8.3 Key Board ------------------------------------------------------------------------------------------------------------------------- 28
9. Maintainability ----------------------------------------------------------------------------------------------------------------------- 29
9.1 Equipments and Tools Requirements -------------------------------------------------------------------------------------- 29
9.2 Trouble Shooting ---------------------------------------------------------------------------------------------------------------- 30
9.2.1 Main Board --------------------------------------------------------------------------------------------------------------- 30
9.2.2 Power/Inverter Board --------------------------------------------------------------------------------------------------- 33
9.2.3 Key Pad Board ------------------------------------------------------------------------------------------------------------- 35
10. White-Balance, Luminance Adjustment --------------------------------------------------------------------------------- 36
11. Check List After Replacing LCD Main Board ---------------------------------------------------------------------------- 38
12. EDID Content ---------------------------------------------------------------------------------------------------------------------- 42
13. BOM List ----------------------------------------------------------------------------------------------------------------------------- 43
2
HP VS19T
Revision List
Version Date Revision History TPV Mode Name
A00 Jan-21-06 Initial release T980KS4DKHHPAP
3
1.Monitor Specification
Items Description
Driving system TFT Color LCD
Panel LTM190EX-L21
Display area 376.32(H) x301.056 (V) (19.0")
Pixel pitch 0.294mm( H )x 0.294mm( V )
LCD Panel
Viewable angle 140˚ (H) 135˚ (V)
Response time (typ.) 16 ms
Brightness 250
Contrast 400:1
Video Analog
HP VS19T
Input
Display Colors Over 16 million Colors
Dot Clock 140MHz
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Consumption
Power Source 90~265VAC,47~63Hz
Environmental
Considerations
Sync. Type H/V TTL
H-Frequency 30kHz – 83kHz
V-Frequency 50-76Hz
ON Mode
Sleep Mode
OFF Mode
Operating Temp: 5°C to 35°C
Storage Temp.: -20°C to 60°C
Operating Humidity : 20% to 80%
37W
≤
2W
≤
1W
≤
Main Dimensions
Weight (N. W.)
Unpackaged(W*H*D) 425.5mm*423.1mm*203.9mm
Packaged(W*H*D) 525mm*535mm*175mm
Packaged 6.8Kg Unit
Unpackaged 5.3Kg Unit
4
HP VS19T
(
2.LCD Monitor Description
The LCD Monitor will contain main board, power board, key board and an audio board 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.
Include adapter and inverter)
Power Board
AC-IN
110V-240V
Monitor Block Diagram
CCFT Drive.
Main Board
Audio board
Keyboard
Flat Panel and
CCFL backlight
RS232 Connector
For white balance
adjustment in
factory mode
Video signal, DDC
HOST Computer
3. Operation Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel.
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
- Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again to restore normal status.
- Left / Right Button:
When the OSD show on screen, Left/Right Button are used to control the monitor functions. Press to switch
functions or adjust settings. And if the OSD off, Left buttons is used to automatically set the H Position, V Position,
Clock and Phase.
- Power Indicator:
Green — Power On mode.
Orange — Power Saving mode.
Blank — Power Off Mode.
5
HP VS19T
6
3.3 Adjust the Picture
HP VS19T
NO. Control Icons NO. Control Icons
1 Brightness
2 Contrast
3 Auto Adjustment
4 Image Control
5 Color
6 Custom Color
7 Language
8 Management
9 OSD Control
10 Information 25 Vertical OSD Position
11 Factory Reset
12 Default Video Input
13 Horizontal Position
14 Vertical Position
15 Clock
16 Clock Phase
17 Power Saver
18 Mode Display
19 Power-On Status Display
20 Sleep Timer
21 Basic Menu
22 Advanced Menu
23 Power On Recall
24 Horizontal OSD Position
26 OSD Timeout
27 OSD Transparency
28 Volume
29 Exit
7
HP VS19T
4. Input/Output Specification
4.1 Input Signal Connector
Pin Mnemonic Signal Pin Mnemonic Signal
1 RV Red Video 9 +5 V +5 V (from PC)
2 GV Green Video 10 SG Sync Ground
3 BV Blue Video 11 NC None
4 NC PC Connect detection 12 SDA DDC Data
5 GND Ground (DDC Return) 13 HS Horizontal Sync
6 RG Red GND 14 VS Vertical Sync
7 GG Green GND 15 SCL DDC Clock
8 BG Blue GND
PIN 1
PIN 11
VGA connector layout
PIN 5
8
4.2 Factory Preset Display Modes
HP VS19T
Pixel
Preset
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
Format
Horz Freq
(KHz)
Horz
Polarity
Vert Freq
(Hz)
Vert
Polarity
Pixel Clk
(MHz) Source
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
≤37W
9
5. Panel Specification
5.1 General Feature
HP VS19T
Mechanical Information
10
5.2 Optical Characteristics
HP VS19T
11
6. Block Diagram
6.1 Monitor Exploded View
HP VS19T
.
6.2 Software Flow Chart
12
HP VS19T
N
Y
N
N
8
1
2
3
4
5
Y
N
6
7
Y
9
10
N
11
Y
12
13
N
Y
Y
14
15
N
16
Y
17
REMARK:
18
N
19
Y
13
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
HP VS19T
Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
6.3 Electrical Block Diagram
6.3.1 Scalar Board Block Diagram
14
HP VS19T
Crystal
24MHz
(Y601)
LCD Interface
(CN503)
EEPROM
AT24C16
(U602)
MCU
MTV-512MV
(U601)
Key Board
Control
(CN602)
Crystal
14.318MHz
(X401)
Scalar IC TSU56AK
(Include ADC, OSD)
(U401)
D-Sub
Connector
(CN301)
H sync
V sync
RGB
DDC_CLK,
DDC_DAT
6.3.2 Inverter / Power Board Block Diagram
EEPROM
M24C02
(U301)
15
AC input
EMI filter
Bridge
Rectifier
Transformer
Rectifier
diodes
HP VS19T
12V Dc to Dc
and Filter
StartCircuit:
R909/R910/R931
PWM
Control IC
Over
Voltage
Protect
Feedback
Circuit
Lamp
LC
Resonance
Transformer
MOSFET
CN902
5V
12V
ON/OFF
Feedback
Circuit
Over
Voltage
PWM
Control IC
ON/OFF
Control
DIM
16
7. Schematic
7.1 Main Board
HP VS19T
SCHEMATIC
VCPU
VAA4
5V
VAA3
VAA2
VCC3.3
VCC1.8
VAA1
5V
VCC5V
VCPU
VCC5V
B1
TXD
RXD
DDC_DAT
ST_DET1 HSYNC
DDC_WP
3.INPUT
B3
DDC_WP
ST_DET1
DDC_CLK
DDC_DAT
RXD
HWRESET
TXD
VCPU
onPANEL_5V/3.3V
onBACKLITE
onPANEL_12V
AUDIO_SD
6.MCU
B6
VCC5V
5V
AUDIO_SD
7.AUDIO
B4
onPanel_12V
onBACKLITE
onPanel_5V/3.3V
VCPU
VCC5V
VCC3.3
AdjBACKLITE
VCC1.8
VAA1
VAA2
VAA3
VAA4
VLCD_12V
5V
2.POWER
GNDR
GNDG
GNDB
VSYNC
ROUT+1
LOUT+1
OUT-LOUT-L+
OUT-R+
OUT-R-
OUT-R-
OUT-R+
OUT-L+
OUT-L-
LOUT+1
ROUT+1
VOLUME
GND
VLCD
SOGDDC_CLK
CSZ
SDA
GND
SCL
INT
AD0
AD1
AD2
AD3
FOR
B2
RIN
GIN
BIN
VLCD
VLCD_12V
RIN
GNDR
GIN
GNDG
SOG
BIN
GNDB
HSYNC
VSYNC
CSZ
SCL
SDA
HWRESET
INT
AD0
AD1
AD2
AD3
VOLUME
AdjBACKLITE
4.SCALER
HPQ2005
VCC1.8
VCC3.3
VAA1
VAA2
VAA3
VAA4
PA[0..9]
PB[0..9]
GA[0..3]
BA[0..5]
ESP
OSP
GPO[0..4]
VCC1.8
VCC3.3
PA[0..9]
PB[0..9]
GA[0..3]
BA[0..5]
ESP
OSP
GPO[0..4]
B5
PA[0..9]
PB[0..9]
GA[0..3]
BA[0..5]
ESP
OSP
GPO[0..4]
VAA4VAA3
VLCD
VLCD_12V
VLCD
VLCD_12V
VAA2
VAA1
5.PANEL INTERFACE
Title
Size Document Number Rev
Date: Sheet
AOC SCHEMATIC FOR HPQ2005
B
TOP
17Monday, September 13, 2004
A
of
17
AdjBACKLITE4
onPanel_5V/3.3V6
GND 3,4,5,6,7
GND
GND
VCC12V
5V
VCC5V
GND
Brightness
R205 4.7K 1/16W
CN201
1
3
5
7
9
11
CONN
1
R207 4.7K 1/16W
C207
0.1uF
VCC5V
1
2
4
6
8
10
12
R203
1K 1/16W
32
Q202
PMBS3904
VCC5V
32
ON_OFF
DIM
VCC12V
5V
VCC5V
GND
10K 1/16W
R208
10K 1/16W
Q204
PMBS3904
R204
220uF/25V
10K 1/16W
R
C206
1uF
C202
VCC12V
C230
NC 0.47uF
HP VS19T
+
C209
47uF/16V
C214
0.1uF
VCC5V+
+
D202
DIODE
C210
0.1uF
TO-263
3
1
U202
VIN
ADJ
AIC1084-33M
TO-252
U201
AZ1117D-1.8
3 2
VI VO
2
VOUT
GND
1
C215
47uF/16V
U201 change to 1.8V
C211
+
47uF/16V
VCC3.3
C216
+
0.1uF
VCC1.8
VAA1
VAA2
VAA3
VAA4
C212
0.1uF
FB202
600 OHM
VCC1.8 4
VCC3.3 4,7
VCPU 6
VAA1 4,7
VAA2 4,7
VAA3 4,7
VAA4 4,7
VCC5V
R202
10K 1/16W
R201 4.7K 1/16W
D201 DIODE SCHOTTKY
FB201
NC
C203
+
0.1uF
C
0.1uF
VLCD
+
+
Q203
AO3401
C208
10uF/16V
C204
220uF/25V
C205
0.1uF
VLCD 5
VCC5V
VCC5V+
VCC5V
VCC5V 3,4,7
VCPU
VCPU 6
5V
5V 7
+
VCC3.3
R209
NC
R211
10K 1/16W
C219
220uF/25V
R210
0 1/16W
C201
0.1uF
C220
0.1uF
32
R212 4.7K 1/16W
1
Q201
PMBS3904
5V
VS19
onBACKLITE 6
VCC5V
VS17
VCC5V+
C213
47uF/16V
VCC12V
R215
10K 1/16W
C217
0.1uF
32
Q205
1
PMBS3904
R214 4.7K 1/16W
onPanel_12V6
VLCD_12V
VLCD_12V 5
Q206
AO3407
+
10uF/16V
C218
VCC12V
R216
4.7K 1/16W
H1
678
5
9
678
5
9
4
4
123
H8D3.5-2LX
123
H2
678
9
123
123
5
678
5
4
4
H8D3.5-2LX
9
H3
678
9
123
123
5
678
5
4
4
H8D3.5-2LX
9
H4
678
5
9
678
5
9
123
123
4
4
H8D3.5-2LX
Title
Size Document Number Rev
B
Date: Sheet
AOC SCHEMATIC FOR HPQ2005
POWER
of
27Thursday, November 18, 2004
A
18
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