ViewSonic Q19wb-3 User manual

ViewSonic Q19wb-3
Model No. VS11578
19” Color TFT LCD Display
(Q19wb-3_SM Rev. 1a Oct. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA- [phone]
Service Manual

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Copyright
Copyright © 2006 by ViewSonic Corporation. All rights reserved. No part of this publication
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language, in any form or by any means, electronic, mechanical, magnetic,
optical, chemical, manual or otherwise, without the prior written permission of ViewSonic
Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to
the contents hereof and specifically disclaims any warranty of merchantability or fitness for any
particular purpose. Further, ViewSonic reserves the right to revise this publication and to make
changes from time to time in the contents hereof without obligation of ViewSonic to notify any
person of such revision or changes.
Trademarks
Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 10/31/2006 Initial Release Jamie Chang

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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 4
3. Front Panel Function Control Description 10
4. Circuit Description 12
5. Adjustment Procedure 20
6. Troubleshooting Flow Chart 42
7. Recommended Spare Parts List 46
8. Exploded Diagram and Exploded Parts List 48
9. Block Diagram 52
10. Schematic Diagrams 53
11. PCB Layout Diagrams 61

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1. Precautions and Safety Notices
1. Precaution & Safety Notice
1. Caution :
No modification of any circuit should be attempted . Service work should only be performed after you are thoroughly
familiar with all of the following safety checks and servicing guide line
2. Safety Check :
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These
voltage are exposed in such areas as the associated transformer circuits .
3. POWER SUPPLY REQUIREMENTS
The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC cord is
permanently attached .Any attempt to replace another adapter could result in serious problem on the display .
4. LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part and a good earth
ground
4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the combination
1500 ohm resistor and 0.15uF capacitor.
4-4 Move the resistor connection to each exposed metallic part and measure the voltage.
4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. Aleakage current
tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0 milliamp. In the
case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the chance of a shock
hazard .
To Metal Parts
V
AC VOLTMETER
1500 10W
0.15u
.
Earth Ground

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Q19wb-3 series handling Notice
Correct Method Incorrect method
Correct Method Incorrect method
Correct Method Incorrect method

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Correct Method Incorrect method
Correct Method Incorrect method

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2. Specification
1. GENERAL REQUIREMENTS
General Specification
Test Resolution & Frequency 1440x900 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 80%, Brightness = 100%
2. SIGNAL INTERFACE
Video Interface
Input Connector (refer the appendix A) D-Sub = DB-15 (Analog)
Default Input Connector D-Sub
Video Cable Strain Relief Equal to twice the weight of the monitor for
five minutes
Video Cable Connector DB-15 Pin out Compliant DDC1/2B
Video RGB (Analog)
Video Signals Separate Sync / SOG / Composite
Video Impedance 75 Ohms (Analog)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC/CI N/A
Sync Compatibility Separate Sync / Composite Sync / SOG
Video Compatibility Shall be compatible with all PC type computers, Macintosh computers, and after
market video cards
Resolution Compatibility
640 x 350, 640 x 400, 640 x 480, 720 x 400,
800 x 600, 832 x 624, 1024 x 768,
1152 x 864, 1152 x 870,1280 x 1024,
1440 x 900,
Exclusions Not compatible with interlaced video

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3. Power
Internal Power Supply Delta EADP-45AF BF
Input Voltage Range 90 to 264 VAC
Input Frequency Range 47.5 to 63 Hertz
Short Circuit Protection Output can be shorted without damage
Over Current Protection 5.0 A typical at 12.0 VDC
Leakage Current 0.75mA(Max) at 264VAC / 50Hz
Efficiency 75 % (min.)
Fuse Internal and not user replaceable
Power Dissipation 45 Watts (typ)
Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @264VAC
Inrush Current (Cold Start) 60 A (max) @ 115VAC
90A(Max)264VAC
Power Supply Cold Start Shall start and function properly when under full load, with all combinations of input voltage, input frequency, and operating
temperature.
Power Supply Transient Immunity Shall be able to withstand anANSI/IEEE C62.41-1980 6000V 200
ampere ring wave transient test with no damage.
Power Supply Line Surge Immunity Shall be able to withstand 1.5 times nominal
line voltage for one cycle with no damage.
Power Supply Missing Cycle Immunity
Shall be able to function properly,without
reset or visible screen artifacts, when ½
cycle of AC power is randomly missing at
nominal input.
Power SupplyAcoustics
The power supply shall not produce audible noise that would be
detectable by the user.
Audible shall defined to be in compliance with ISO 7779 (DIN
EN27779:1991) Noise
measurements of machines acoustics. Power
Switch noise shall not be considered.
Power Saving Operation(Method) VESA DPMS Signaling
On Mode < 40 W (Typ) / 36 W (max)
Power Consumption Active Off < 1 W
Recovery Time On Mode = N/A, Active Off < 5 sec
4. ELECTRICAL REQUIREMENTS
Horizontal /Vertical Frequency
Horizontal Frequency 31 – 81 kHz
Vertical Refresh Rate 50 – 75 Hz.
Maximum Pixel Clock 140 MHz
Sync Polarity Independent of sync polarity.
Timing Table AnalogItem Timing
Separated
Composite
SOG
Digital - TMDS
Remark
1 640 x 350 @ 70 Hz, 31.5 KHz
2 640 x 400 @ 70 Hz, 31.5 KHz
For Separated Sync, Switch
640x400@70Hz and 720x400@70Hz by
[AUTO]+[MENU]
short cut key (primary = 720x400@70Hz)

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3 640 x 480 @ 60 Hz, 31.5 KHz
4 640 x 480 @ 67 Hz, 35 KHz
5 640 x 480 @ 72 Hz, 37.9 KHz
6 640 x 480 @ 75 Hz, 37.5 KHz
7 720 x 400 @ 70 Hz, 31.5 KHz
8 800 x 600 @ 56 Hz, 35.1 KHz
9 800 x 600 @ 60 Hz, 37.9 KHz
10 800 x 600 @ 72 Hz, 48.1 KHz
11 800 x 600 @ 75 Hz, 49.6 KHz
12 832 x 624 @ 75 Hz, 49.7 KHz
13 1024 x 768 @ 60 Hz, 48.4 KHz
14 1024 x 768 @ 70 Hz, 56.5 KHz
15 1024 x 768 @ 72 Hz, 58.1 KHz
16 1024 x 768 @ 75 Hz, 60 KHz
17 1152 x 864 @ 75 Hz, 67.5 KHz
18 1152 x 870 @ 75 Hz, 68.7 KHz
19 1280 x 1024 @ 60 Hz, 64 KHz
20 1280 x 1024 @ 75 Hz, 80 KHz
21 1280 x 960 @ 60 Hz 59.7 KHz
22 1440 x 900 @ 60 Hz, 55.9 KHz
23 1440 x 900 @ 75 Hz, 70 KHz
Changing Modes
● Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Adjust” time
● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto
Adjust”
● The monitor needs to do “Auto Adjust” the first time a new mode is detected
(see section “0-Touch™ FunctionActions”)
● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank

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5. LCD Panel
1st Source Panel
Model number Hannstar HSD190MGW1-A00
Type Active Matrix TFT
Active Size 19.1"w
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.2835mm x 0.2835mm
Glass Treatment Anti-Glare
# of Backlights 4 CCFL
Backlight Life 50000 Hrs (Min)@6.5mA
300 cd/m2 (Typ after 30 minute warm up)Luminance (Center) –
CT = 6500K,
Contrast/ Brightness = Max 240 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75% (min)
Contrast Ratio 700 :1 (Typ)
450 : 1 (Min)
Color Depth 16.2 million colors (6-bit+FRC panel)
Horizontal Viewing Angle 150 degrees (Typ) @ CR>10
130 degrees (Min) @ CR>10
Vertical Viewing Angle 140 degrees (Typ) @ CR>10
120 degrees (Min) @ CR>10
Response Time On/Off
10%-90% @ Ta=25°C Typical = 5 ms (Tr = 1.5 ms; Tf = 3.5 ms)
Maximun = 10 ms (Tr = 3ms; Tf = 7ms)
Mercury 3.5 mg per lamp
Panel Defects Please see Panel Quality Specifications.

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2nd Source Panel
Model number Hannstar HSD190MGW1-A02
Type Active Matrix TFT
Active Size 19.1"w
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.2835mm x 0.2835mm
Glass Treatment Anti-Glare
# of Backlights 4 CCFL
Backlight Life 50000 Hrs (Min)@6.5mA
300 cd/m2 (Typ after 30 minute warm up)Luminance (Center) –
CT = 6500K,
Contrast/ Brightness = Max 240 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75% (min)
Contrast Ratio 700 :1 (Typ)
450 : 1 (Min)
Color Depth 16.2 million colors (6-bit+FRC panel)
Horizontal Viewing Angle 150 degrees (Typ) @ CR>10
130 degrees (Min) @ CR>10
Vertical Viewing Angle 140 degrees (Typ) @ CR>10
120 degrees (Min) @ CR>10
Response Time On/Off
10%-90% @ Ta=25°C Typical = 5 ms (Tr = 1.5 ms; Tf = 3.5 ms)
Maximun = 10 ms (Tr = 3ms; Tf = 7ms)
Mercury 3.5 mg per lamp
Panel Defects Please see Panel Quality Specifications.

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6. MECHANICAL.
Dimension (Desktop)
Width 446mm (17.6")
Height (Height adjust to the bottom) 364mm (14.3")
Depth 213.6mm (8.4")
Monitor Weight 4.4Kg (9.7 lbs)
*Refer to Figure 1
Dimension (Head Only / Wall Mount)
Width 446mm (17.6")
Height 292mm (11.5")
Depth 66.6mm (2.6")
Monitor Weight 4.0 Kg (8.8 lbs)
*Refer to Figure 1
Ergonomics
Tilt Up ≧20º
Tilt Down From 0º down to -3º ~ -5º
7. ENVIRONMENTAL
zOperating Temperature : 0°C to +40°C
zStorage Temperature : -20°C to +60°C
zOperating Relative Humidity : 20% to 90% RH Non-Condensing
zStorage Relative Humidity : 5% to 90% RH Non-Condensing
zOperating Altitude : 0 to +3,000 meters
zStorage Altitude : 0 to +12,000 meters

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3. Front Panel Function Control Description
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Main Menu Controls
Adjust the menu items shown below by using the left and right buttons.
A. Brightness adjusts the lamps current to control the screen brightness.
B. Contrast adjusts the difference between the image background (black level) and the foreground (white level).
C. Image adjust controls are explained below:
Auto Adjustment automatically sizes, centers, clock ,phase and fine tunes the video signal to eliminate waviness and
distortion. Press the [menu] button to obtain a sharper image.
H./V. Position adjusts horizontal and vertical position of the screen image. You can toggle between Horizontal and
Vertical by pressing button [menu]. Horizontal moves the screen image to the left or to the right. Vertical moves the screen
image up and down.
Clock adjust Sets up the internal clock. Larger values make the displayed image appear wider; smaller values make it
appear compressed.
Phase adjust Adjusts the internal clock’s time lag in order to optimize the screen image.
Sharpness adjustthe clarity and focus of the screen image.
D. Color Adjust provides several color options: preset color temperatures and Custom User Color which allows you to adjust
red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500° Kelvin).
9300K — Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting).
5400K — Adds red to the screen image for warmer white and richer red.
Custom User Color — Individual adjustments for red, green, and blue.
1 To select color (R, G or B) press button [menu].
2 To adjust selected color, press [<] or [>] .
3 When you are finished making all color adjustments, press button [Auto] twice.
E. OSD CONTROL controls are explained below:
H/V.OSD Position allows you to move the on-screen display menus and control screens.
OSD Timeout sets the length of time an on-screen display screen is displayed. For example, with a“15 second” setting,
if a control is not pushed within 15 seconds, the display OSD disappears.
F. OtherAdjust controls are explained below:
Language allows you to choose the language used in the menus and control screens.
Speaker volume allows you to increase or decrease the volume.
Information there is an optional OSD window that displays the newly adjusted screen resolution settings.
G. Reset returns adjustments to the original factory settings if the display is operating in a factory Preset Timing Mode listed
in this user guide.
H. Exit allows you exit the OSD menu, press button [Menu].

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4. Circuit Description
1. Outline
1.1 Auto button, left arrow button, right arrow button, Menu button, Power button on the front panel.
1.2 D-sub 15pin connector, audio line-in receptacle, and AC-IN are located on the back side of the cabinet.
1.3 OSD menu includes the following function;
(1)Brightness& Contrast adjusts
(2) Image Adjust
(3) Color Adjust
(4) OSD Control
(5) Other Adjust
(6) Reset
(7) Exit
1.4Speaker Volume & the control bar is adjustable by [<], [>] button. Mute or Speaker [MENU] key when speaker
volume OSD appear Audio volume can be controlled with right arrow button whenAudio Adjust menu is active.
2. CONNECTORS
2.1 AC inlet : CEE7-7 typed connector
2.2 Audio : Line-in,
AJ1
PHONE JACK 5P (ZD005D100)
2
3
4
5
1
Line-in receptacle
(Line-in receptacle is green)
2.3 Video signal connector for analog input: 15P Mini D-Sub
CN1
VGA
1
6
2
7
3
8
4
9
5
11
12
13
14
15 10
1617
PIN MNEMONI SIGNAL
1 RV Red Video
2 GV Green Video
3 BV Blue Video
4 NC None
5 GND Ground(DDC return)
6 RG Red GND
7 GG Green GND
8 BG Blue GND
9 +5V +5V (for DDC)
10 SG Sync GND
11 NC None
12 SDA DDC Data
13 HS Horizontal Sync
14 VS Vertical Sync
15 SCL DDC Clock

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3. ELECTRICAL SPECIFICATIONS
3.1 Standard Testing conditions
Display Area 408.24(H) x 255.15(V) mm
Video Signal 0.7Vpp
Contrast Default
Brightness Default
Ambient 25 +/- 5 °C
Input AC230V+/-10%@50HZ
Warming up > 30 min
Display 1400 x 900@60HZ
3.2 POWER
3.2.1 Power supply
Input voltage 90~264Vac
Power frequency 47~63Hz
<1.2Arms@90VacInput current
<0.7 Arms @264Vac
Inrush current 90A(Max) @ 264Vac(cold start)
Power consumption 40W(MAX)
3.2.2 Power Management
State Power Indicator
On <40Watts Green
Standby < 1Watts Amber
off <1Watts Dark
3.3 Acceptable timing
If the timing is within following specification, this LCD display can automatically function with a certain position.
Horizontal: Sync frequency: 31~81 KHz (Analog: 165MHz)
Vertical:Syncfrequency:50~75Hz
3.4 Signal level and input impedance
3.4.1 Video Signal level: 0.7Vp-p Video signal.
3.4.2 Sync Signal level
H/V Separate: TTL level
3.4.3 Input impedance
Analog video input: 75 ohm
Sync input: > 1 k ohm
Audio input: 10K ohm
4. SIGNAL CABLE: Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.

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5. EDID data
5.1.Analog EDID: Analog EDID is stored in U6
HSD panel:
VIEWSONIC CORPORATION
EDID Version # 1, Revision # 3
DDCTest For: ViewSonic Q19wb-3
______________________________________________________________________
EDID Block 0, Bytes 0-127
128 BYTES OF EDID CODE:
0 1 2 3 4 5 6 7 8 9
________________________________________
0 | 00 FF FF FF FF FF FF 00 5A 63
10 | 1F 3E 01 01 01 01 01 10 01 03
20 | 08 29 1A 78 2E 9B B6 A4 53 4B
30 | 9D 24 14 4F 54 BF EF 80 95 00
40 | 95 0F 81 80 81 40 71 4F 01 01
50 | 01 01 01 01 9A 29 A0 D0 51 84
60 | 22 30 50 98 36 00 98 FF 10 00
70 | 00 1C 00 00 00 FF 00 51 48 5A
80 | 30 36 30 31 30 30 30 30 31 0A
90 | 00 00 00 FD 00 38 4B 1F 50 0E
100 | 00 0A 20 20 20 20 20 20 00 00
110 | 00 FC 00 51 31 39 77 62 2D 33
120 | 0A 20 20 20 20 20 00 98
______________________________________________________________________
(08-09) ID Manufacturer Name ________________ = VSC
(11-10) Product ID Code _____________________ = 3E1F
(12-15) Last 5 Digits of Serial Number ______ = Not Used
(16) Week of Manufacture _________________ = 01
(17) Year of Manufacture _________________ = 2006
(10-17) Complete Serial Number ______________ = See Descriptor Block
(18) EDID Version Number _________________ = 1
(19) EDID Revision Number ________________ = 3
(20) VIDEO INPUT DEFINITION:
Analog Signal
0.700, 0.300 (1.000 Vp-p)
Separate Syncs
(21) Maximum Horizontal Image Size ________________ = 410 mm
(22) Maximum Vertical Image Size __________________ = 260 mm
(23) Display Gamma ________________________________ = 2.20
(24) Power Management and Supported Feature(s):

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Active Off/Very Low Power, Standard Default Color Space,
Preferred Timing Mode
Display Type = R/G/B Color
(25-34) CHROMA INFO:
Red X - 0.643 Green X - 0.295 Blue X - 0.143 White X - 0.310
Red Y - 0.325 Green Y - 0.616 Blue Y - 0.081 White Y - 0.330
(35) ESTABLISHED TIMING I:
720 X 400 @ 70Hz (IBM,VGA)
640 X 480 @ 60Hz (IBM,VGA)
640 X 480 @ 67Hz (Apple,Mac II)
640 X 480 @ 72Hz (VESA)
640 X 480 @ 75Hz (VESA)
800 X 600 @ 56Hz (VESA)
800 X 600 @ 60Hz (VESA)
(36) ESTABLISHED TIMING II:
800 X 600 @ 72Hz (VESA)
800 X 600 @ 75Hz (VESA)
832 X 624 @ 75Hz (Apple,Mac II)
1024 X 768 @ 60Hz (VESA)
1024 X 768 @ 70Hz (VESA)
1024 X 768 @ 75Hz (VESA)
1280 X 1024 @ 75Hz (VESA)
(37) Manufacturer's Reserved Timing:
1152 X 870 @ 75Hz (Apple,Mac II)
(38-53) Standard Timing Identification:
1440 X 900 @60Hz
1440 X 900 @75Hz
1280 X 1024 @60Hz
1280 X 960 @60Hz
1152 X 864 @75Hz
Not Used
Not Used
Not Used
______________________________________________________________________
(54-71) Detailed Timing / Descriptor Block 1:
1440x900 Pixel Clock: 106.50 MHz
______________________________________________________________________
Horizontal Image Size: 408 mm Vertical Image Size: 255 mm
Refreshed Mode: Non-Interlaced Normal Display - No Stereo
Horizontal:
Active Time: 1440 pixels Blanking Time: 464 pixels

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Sync Offset: 80 pixels Sync Pulse Width: 152 pixels
Border: 0 pixels Frequency: 55.93 KHz
Vertical:
Active Time: 900 lines Blanking Time: 34 lines
Sync Offset: 3 lines Sync Pulse Width: 6 lines
Border: 0 lines Frequency: 59.89 Hz
Digital Separate, Horizontal Polarity (-) Vertical Polarity (+)
______________________________________________________________________
(72-89) Detailed Timing / Descriptor Block 2:
Monitor Serial Number:
QHZ060100001
______________________________________________________________________
(90-107) Detailed Timing / Descriptor Block 3:
Monitor Range Limits:
Min Vertical Freq - 56 Hz
Max Vertical Freq - 75 Hz
Min Horiz. Freq - 31 KHz
Max Horiz. Freq - 80 KHz
Pixel Clock - 140 MHz
Secondary GTF - Not Supported
______________________________________________________________________
(108-125) Detailed Timing / Descriptor Block 4:
Monitor Name:
Q19wb-3
(126) No Extension EDID Block(s)
(127) CheckSum OK

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6. THEORY OF OPERATION
This section describes the function of the LCD monitor per functional block.19” monitor includes MB
board (including audio board function inside), inverter board, (including adapter function inside) and button board.
6.1 MB BOARD
The MB board is a two-layer, single-landed design with ground and ground planes provided.
The VGA cable is a signal cable that contains video signal, sync signal and DDC signal from PC VGA adapter
This system board consists of 3 functional areas : flat panel controller, Micro controller and audio controller.
6.1.1 Flat panel controller…… TSUM16AK-LF-1 (U4)
The heart of the system board is Mstar TSUM16AK-LF-1. The TSUM16AK-LF-1 is a graphics processing IC for
LCD monitor. It provides all key IC control functions required for LCD panel. On-chip functions include a
high-speed triple-ADC , PLL, high sacling engine Micro processor and OSD controller ,manages other devices in
the system such as the keypad, the backlight, LED and audio general purpose input/output pins.
a) Clock Generation :
Crystal Input Clock (XTALI and XTAL). This is the input pair to an internal crystal oscillator andcorresponding
logic. A 14.318 MHz crystal is recommended.
b) Hardware Reset ( Pin 19 )
Hardware Reset signal is generated by TSUM16AK-LF-1 (U4/Pin 19).It assert a reset signal at least 1 ms.
Pin number Pin name Pin function
23 GPIO_P00/SAR1 Key-Menu
24 GPIO_P01/SAR2 Key-Sel/Auto
25 GPIO_P02/SAR3 Key-Power on/off
26 GPIO_P03 Key-Right
27 GPIO_P06 Key-Left
28 GPIO_P07 Key-Down(NC)
29 PWM0/GPIO_P26 Key-Up(NC)
30 GPIO_P13 LED-Green
31 GPIO_P14 LED-Orange
35 GPIO_P16/PWM2 Audio-MUTE(NC)
69 GPIO_P15/PWM0 Audio-Stby-Power
78 PWM2/GPIO_P24 Audio-Volume
21 PWM1/GPIO_P25 Backlight-adi
36 DDCD_SDA SDA-VGA (Debug)
37 DDCD_SCL SCL-VGA (Debug)
65 DDCA_SDA/RS232_TX SDA(Debug)
66 DDCA_SCL/RS232_RX SDA(Debug)