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Service Manual
ViewSonic Q9b-2
Model No. VS11201
19" Color TFT LCD Display
(Q9b-2_SM Rev. 1b Aug. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA (800) 888-8583
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 05/02/2006 Initial Release Jamie Chang
VS-E060267 Add 2nd panel source(HSD190ME-A10/A16)
1b 08/22/2006 Jamie Chang
VS-E060268 (updated RSPL, BOM, Spec.)
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 5
3. Front Panel Function Control Description 14
4. Circuit Description 20
5. Adjustment Procedure 25
6. Troubleshooting Flow Chart 45
7. Recommended Spare Parts List 53
8. Exploded Diagram and Exploded Parts List 58
9. Block Diagram 61
10. Schematic Diagrams 62
11. PCB Layout Diagrams 69
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1. Precautions and Safety Notices
1. Appropriate Operation
(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the LCD panel surface.
(3) Use a soft cloth soaked with mild detergent to clean the display housing.
(4) Use only a high quality, safety approved AC/DC power cord.
(5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
(7) Do not touch the LCD panel surface with sharp or hard objects.
(8) Do not place heavy objects on the LCD display, video cable, or power cord.
(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(10) Do not operate the product under the following conditions:
- Extremely hot, cold or humid environment.
- Areas containing excessive dust and dirt.
- Near any appliance generating a strong magnetic field.
- In direct sunlight.
2. 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 guidelines.
3. Safety Check
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is
exposed in such areas as the associated transformer circuits.
4. LCD Module Handling Precautions
4.1 Handling Precautions
(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when connecting or disconnecting input connector.
(3) Wipe off water drops immediately. Long contact with water may cause discoloration or spots.
(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.
(6) Since CMOS LSI is used in this module, take care of static electricity and ensure human earth when handling.
(7) Do not open or modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module in any direction.
(9) In the event that a Module must be put back into the packing container slot after it was taken out of the
container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the
CFL Reflector edge softly. Otherwise the TFT Module may be damaged.
(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface
Connector of the TFT Module.
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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or
bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration
that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module
may be damaged.
(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local
ordinances or regulations for disposal.
(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module
should be supplied with power that complies with the requirements of Limited Power Source
(IEC60950 or UL1950), or an exemption should be applied for.
(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950
or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit.
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Handing and Placing methods
Correct methods Incorrect methods
Only touch the metal frame of the LCD panel or the Surface of the LCD panel is pressed by fingers and that
front cover of the monitor, DO not touch the surfaceof may cause"mura"
the POL
Take out the monitor with cushions Taking out the monitor by grasping the LCD panel, that
May cause"mura"
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Correct methods Incorrect methods
Place the monitor on a clean and soft foam pad Placing the monitor on a foreign objects, that could
scratch The surface of the "Panel" or cause "mura"
The panel is placed facedown the lap,that may cause
"mura"
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2. Specification
2-1 GENERAL specification
Test Resolution & Frequency 1280x1024 @ 75Hz
Test Image Size Full Size
Factory Default:
Contrast and Brightness Controls
Contrast = 90%, Brightness = 100%
2-2 VIDEO INTERFACE
Input Connector (refer the appendix A) DB-15 (Analog)
Default Input Connector Defaults to the first detected input
Equal to twice the weight of the monitor for five
Video Cable Strain Relief
minutes
Video Cable Connector DB-15 Pin out Compliant 2B
Video RGB (Analog)
Video Signals Separate Sync
TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
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
DDC2B Compliant with Revision 1.0
Sync Compatibility Separate Sync
Shall be compatible with all PC type computers,
Video Compatibility Macintosh computers, and after market video
cards
640x350, 720x400, 640x480, 800x600, 832x624,
Resolution Compatibility 1024x768, 1152x864,
1152x870, 1280x960, 1280x1024
Exclusions Not compatible with interlaced video
2-3 USB INTERFACE
N/A
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2-4 POWER SUPPLY
Internal Power Supply FSP FSP035-1PI01ZT
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 3.5mA (Max) at 254VAC / 60Hz
Efficiency 80 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 36W(typ) 40W(max)
Max Input AC Current 1.5 Arms @ 90VAC, 0.75 Arms @180VAC
50 A (max) @ 115VAC
Inrush Current (Cold Start)
90 A (max) @ 230VAC
Shall start and function properly when under full
load, with all combinations of input voltage, input
Power Supply Cold Start
frequency, and operating temperature.
Shall be able to withstand an ANSI/IEEE
Power Supply Transient Immunity C62.41-1980 6000V 200 ampere ring wave
transient test with no damage.
Shall be able to withstand 1.5 times nominal line
Power Supply Line Surge Immunity
voltage for one cycle with no damage.
Shall be able to function properly, without reset or
Power Supply Missing Cycle Immunity visible screen artifacts, when ½ cycle of AC power
is randomly missing at nominal input.
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
Power Supply Acoustics
(DIN EN27779:1991) Noise measurements of
machines acoustics. Power Switch noise shall not
be considered.
Power Saving Operation(Method) VESA DPMS Signaling
On Mode < 36W(Typ) / 40W (max)
Power Consumption Active Off < 1 W @ 120 Vac /
< 1.5W @ 220Vac
Recovery Time On Mode = N/A, Active Off < 3 sec
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2-5 ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 30 80 kHz
Vertical Refresh Rate 55 75 Hz.
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity.
Timing Table
Digital - TMDS
Analog
Composite
Separated
Item Timing Remark
SOG
The vertical image size might not full
1 640 x 350 @ 70 Hz, 31.5 KHz ,,Ï screen
(Vertical position = center).
2 640 x 480 @ 60 Hz, 31.5 KHz ,,Ï
3 640 x 480 @ 67 Hz, 35 KHz ,,Ï
4 640 x 480 @ 72 Hz, 37.9 KHz ,,Ï
5 640 x 480 @ 75 Hz, 37.5 KHz ,,Ï
6 720 x 400 @ 70 Hz, 31.5 KHz ,,Ï
7 800 x 600 @ 56 Hz, 35.1 KHz ,,Ï
8 800 x 600 @ 60 Hz, 37.9 KHz ,,Ï
9 800 x 600 @ 72 Hz, 48.1 KHz ,,Ï
10 800 x 600 @ 75 Hz, 46.9 KHz ,,Ï
11 832 x 624 @ 75 Hz, 49.7 KHz ,,Ï
12 1024 x 768 @ 60 Hz, 48.4 KHz ,,Ï
13 1024 x 768 @ 70 Hz, 56.5 KHz ,,Ï
14 1024 x 768 @ 75 Hz, 60.2 KHz ,,Ï
15 1152 x 864 @ 75 Hz, 67.5 KHz ,,Ï
16 1152 x 870 @ 75 Hz, 68.7 KHz ,,Ï
17 1280 x 960 @ 60 Hz, 59.7 KHz ,,Ï
18 1280 x 1024 @ 60 Hz, 64 KHz ,,Ï
19 1280 x 1024 @ 75 Hz, 80 KHz ,,Ï
Primary Presets
1280x1024 @ 75Hz
User Presets
Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration
Changing Modes
¡´ Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding "Auto Adjust" time
¡´ The monitor needs to do "Auto Adjust" the first time a new mode is detected
(see section "0-TouchTM Function Actions")
¡´ While running Change Mode, Auto Adjust or Memory Recall, the image shall blank
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2-6 FRONT PANEL CONTROLS AND INDICATORS
Front Panel Hardware Controls
Power Switch (Front Head) Power Control, soft Power Switch.
Power LED (Front Head) Green ON
Orange Active Off
Dark = Soft Power Switch OFF
Front Panel Controls Button Icon Function
(Head; From left to right) Button1 Select(backward)
Button2 Select(forward)
Button3 Power
Button4 - Adjust Down
Button5 + Adjust Up
Reaction Time OSD must fully appear within 0.5s after pushing Button 1
Short Cuts Function from the button(s)
Button 1 Auto Image Adjust.
Button 2 Main Menu
Button 4 Mute on/off
Button 5 Volume OSD
Button 4 + Button 5 Factory Mode
+ Button 3 (The Burning mode is build in Factory mode)
Remark : All the short cuts function are only available while OSD off
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Function descriptions
Main Menu Controls
The Main Menu OSD include most of control functions.
Please refer to APPENDIX B (Main Menu OSD Table) for the detail.
Factory Default OSD Actions
Memory Recall action on the analog and digital mode as below
1. Set the factory defaults as shown in Section 2-8
2. Clean all the mode setting buffer
3. Execute Auto Image Adjust
0-TouchTM Function Actions
1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for
further use
2. It should be reset by Memory Recall function
(Should not reset by power off, power unplug and others)
OSD Auto Save
The OSD shall save new settings when it is turned off by the user or when it times out.
There shall not be a separate save
Factory Defaults
Item Defaults
Contrast 90
Brightness 100
Color Setting NATIVE
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2-7 AUDIO INTERFACE (SPEAKER SPECIFICATION)
Speaker specification
Line input connection 3.5 mm stereo jack
Line input signal 0.7 Vrms
Line input impedance 18 kOhm
Maximum power output (Electric) 1 W@ < 15 % distortion
Signal to Noise Ratio 50 dB
Frequency response 200 Hz 10 Khz
Distortion < 5 % THD (@1kHz)
There should be no audible vibration with
Vibration volume at 100% and treble / bass at
default.
There should be no affect on the screen
Screen image
image stability under any conditions.
Connector PC99 requirement Audio in Lime Green pantone # 577C
Cable type / length 3.5mm stereo cable / 1.8m length
Speakers should be off when the rest of
Audio DPMS
the monitor is in power saving.
Under following conditions, there should
be no sympathetic heard
Sympathetic 1. input <=0.7Vrms
2. Volume OSD <=80
Distance =30cm ¡Ó cm
5
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2-8 Panel Characteristics :
st nd
1 and 2 Source Panel
Model number 1st Source Panel: Hannstar HSD190ME13-A16
nd
2 Source Panel: Hannstar HSD190ME13-A10
Type Active Matrix TFT, TN technology
Active Size 19"
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
Glass Treatment Anti-Glare
# of Backlights 4 CCFL
Backlight Life 40000 Hrs (Min)
50000 Hrs (Typ)
Luminance (Center) 300 cd/m2 (Typ after 30 minute warm up)
CCT = User Color (R/G/B=100%),
Contrast/ Brightness = Max
240 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75 % (Typ) / 70 % (Min)
Contrast Ratio 700 :1 (Typ)
450 : 1 (Min)
Color Depth 16.2 million colors (6+2 bit panel)
Typical:
H = 150 degrees
V = 135 degrees
Viewing Angle H, V, D (CR >10)
Minimum:
H = 130 degrees
V = 115 degrees
Typical:
Viewing Angle H, V, D (CR >5) H = 160 degrees
V = 155 degrees
On/Off
Response Time
Typical = 8 ms
10%-90% @ Ta=25°C
Maximun = 12 ms
Mercury 3.0 mg per lamp
Panel Defects Please see Panel Quality Specifications.
*Over 50% units per shipment shall meet the Typical value above.
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2-9 IMAGE PERFORMANCE
Display Size
Horizontal Display Size, Primary Preset Full Screen
Vertical Display Size, Primary Preset Full Screen
Luminance
Lv (Max) Condition:
Lv (Max) = The Luminance requirement of
Brightness / Contrast = 100%
section 2-6 "TFT LCD PANEL"
Color Temperature = User (R/G/B=100)
Lv (NATIVE) Condition:
Brightness = Default / Contrast = Default Lv (NATIVE) / Lv (Max) x 100% > 85%
Color Temperature = NATIVE
Lv (COOL) Condition:
Brightness = Default / Contrast = Default Lv (COOL) / Lv (Max) x 100% > 70%
Color Temperature = COOL
Lv (WARM) Condition:
Brightness = Default / Contrast = Default Lv (WARM) / Lv (Max) x 100% > 70%
Color Temperature = WARM
Contrast Ratio
CR(Max) Condition:
Same as the Contrast Ratio in section 2-6
Contrast / Brightness = 100%
"TFT LCD PANEL"
Color Temperature = User (R/G/B=100)
Saturation
Contrast = Default
Brightness = Default No visible saturation
Test pattern = 128-gray
Preset Color Temperatures
Color Temperature = WARM x = 0.332 ± 0.03
(CCT around 5500K) y = 0.348 ± 0.03
Color Temperature = NATIVE x = 0.313 ± 0.03
(CCT around 6500K) y = 0.329 ± 0.03
Color Temperature = COOL x = 0.283 ± 0.03
(CCT around 9300K) y = 0.298 ± 0.03
Video Cards Compatibility
Peaking Performance : Peaking is not adjustable
Raster Artifacts
¡´ Video Artifacts : No visible streaking, sag, or smearing artifacts when driven by the
specified video cards in the primary mode and after user adjustment to best condition
¡´ Power Supply, and Grounding Artifacts : No visible artifacts in any specified video mode
within the horizontal or vertical frequency range of the monitor
¡´ Temperature Drift : Image shall not drift or lose fine-tune adjustment
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2-10 MECHANICAL
Desktop
Dimension 418 mm (W) x 408 mm (H) x 184 mm (D)
16.5" (W) x 16.1" (H) x 7.2" (D)
Monitor Weight 4.9 Kg (10.8 lbs)
Head Only / Wall Mount
Dimension 418 mm (W) x 363 mm (H) x 57 mm (D)
16.5" (W) x 14.3" (H) x 2.2" (D)
Monitor Weight 4.6 Kg (10.1 lbs)
Ergonomics
Tilt Up +15º ¡Ó º
2
Tilt Down -5 º ¡Ó º
2
Cabinet Material
Display Head Plastic Material ABS-94HB
Neck/Base Plastic Material ABS-94HB
All internal plastic cabinet components shall be
Internal Plastic Cabinet Components
in compliance with the requirements of MPR II
Front Bezel Color The reference for the Front Bezel is the Black
color chip provided by ViewSonic
The color difference between any two cabinet
components shall be less than 0.80 "Delta E",
in the 1976 CIE L*a*b Colorspace.
Neck, Base, Speaker Cover, Rear Cover The reference for the Neck, Base, Speaker
and Rear Logo Color Cover, Rear Cover and Rear Logo is the Black
color chip provided by ViewSonic
The color difference between any two cabinet
components shall be less than 0.80 "Delta E",
in the 1976 CIE L*a*b Colorspace.
The color drift due to UV-Light shall be less than
3.0 "Delta E" in the 1976 CIE L*a*b colorspace.
Cabinet Color Drift Due To UV-Light
Testing shall be performed according to the
requirements of ASTM Test Method D4459-93.
Mold-Tech # 11010 used on all external textured
Cabinet Texture
surfaces.
The supplier shall submit textured color chips,
Samples plastic material specifications, and Material
Safety Data Sheets for approval.
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3. Front Panel Function Control Description
3.1 Functional Description of Controls
a. User Control Panel
b. Description of Key Functions
. Symbol Function
1. Auto-adjust
· 2. Select the next OSD icon up
1. Show the main OSD menu
, 2. Select the next OSD icon down
Power indicator
,, Turn the power on or off
1. Show the mute OSD.
2. Decrease a function's (
... ) value.
3. Move to the next function ( ) left
1. Show the volume OSD menu
2. Increase a function's (
) value.
3. Move to the next function ( ) right
3.2 LED Indicator
The Model has one power LED which has two colors, Green and Amber.
LED should have enough luminance for clear viewable.
Some monitor status area indicated by using this LED, as follows:
Power LED
Normal On Green
Suspend Amber
Active Off Off
Out of Range Amber
No Input Signal Amber (OSD ON)
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3.3 User Adjustment (At Analog Signal input)
Hot Key RGB Mode
Slider Bar
Auto Adjuster
Brightness
OSD
Contrast
H position
V position
User Color Red
Brightness Up Phase Color Green
Native
Color Blue
Clock Cool
Color
Brightness Down
Language
Recall
3.4 Specification (at all Present Timing)
a. BRT / CONT:
Picture background shall become brighter with BRIGHTNESS at its MAX position, and shall become
darker at its MIN position.
Contrast of picture shall be changed by adjusting contrast value.
b. Adjusted Range for H/V Center : ¡Ó0mm or more / ¡Ómm or more
1 5
c. Adjusted Range for H Phase / Pitch : ¡Ö60 steps / ¡Ó0 dots
5
d. Color : Standard Shipping Condition¡Ð Native
Preset Color Mode ¡Ð Cool, Native, Warm.
User Adjustment Mode ¡Ð Users can adjust each R or G or B color individually.
Native: x=0.313¡Ó.015;y=0.329¡Ó.015
0 0
Cool :x=0.283¡Ó.015;y=0.297¡Ó.015
0 0
Warm : x=0.346¡Ó.015;y=0.359¡Ó.015
0 0
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e. Recall : Recall include Brightness, Contrast, Volume, OSD Position, OSD Time, and execute
Auto Adjust.
f. Language: Users can choose one of the eight languages¡GEnglish, French, German, Spanish and
Italian, Russian, Tradition Chinese, Simplify Chinese.
g. Power: Pushing Power button shall cause the monitor to be turned ON and LED to be
illuminated.
Pushing Power button again shall cause the monitor to be turned OFF and LED to be OFF.
3.5 Other User/Service Information
a. SIGNAL OVER RANGE:
If the horizontal or vertical or both input signal frequency exceed the acceptable input frequency
range, the monitor keeps indicating the "SIGNAL OVER RANGE" as the OSD information after
2 seconds. If both input signal frequencies are in the acceptable frequency range, the monitor
puts out the OSD indication and goes back to normal state.
b. RGB NO INPUTSIGNAL:
In case of the pin 14 is +5V, the monitor recognizes PC is connected. Otherwise, the pin 14 is
low (approx. 0V), horizontal or vertical input signals are not exist, the monitor displays OSD
information¡©RGB NO INPUTSIGNAL¡ª5 seconds, then goes to power save.
3.6 Picture Size & Tilt (Primary mode only; to be checked in shipping condition.)
a. Picture Size: ¡ÕAll Models¡Ö Follow Panel Spec.
b. Tilt:
A C
D'
B' D bezel | AB- CD| = Tilt on top ¡Ø 1mm
B
video | EF - GH| = Tilt on bottom ¡Ø 1mm
G
E G' | BB'-EE'| ¡Ø 1mm (at left side)
E'
| DD'-GG'| ¡Ø 1mm (at right side)
F H
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3.7 Brightness Uniformity and Contrast Ratio
a. Brightness Uniformity:
128 640 1152
B C 102
A 512
E D 922
Bmax = MAX (BA, BB, BC, BD, BE)
Bmax - Bmin Bmin = MIN (BA, BB, BC, BD, BE)
¡Ø 20%
Bmax Bave = AVE (BA, BB, BC, BD, BE)
b. Contrast Ratio:
The contrast ratio is measured at point A and calculated by using the following formula
Luminance with all pixels in white
Contrast ratio (CR) ¡× ¡Ù 200 ¡] According to HANNSTAR
Luminance with all pixels in black HSD190ME13-A02)
3.8 Shipping Luminance
a. Condition Input signal : Full white pattern
Controls : Color temperature of Office
Cont./Brt. : Default value
Measurement point : One point at the center of the picture.
Warm-up time : 30 minutes.
Color analyzer : CA-210
c. Shipping luminance (center)
Shipping Luminance
Color Temperature
19"
Native ¡Ù 200 cd / ¢T
3.9 Maximum / Minimum Luminance
a. Condition Input signal : Full white pattern (Primary mode)
Measurement point : Center of LCD screen
Color Analyzer : CA-210
Maximum : BRT¡÷Max.
CONT¡÷Max.
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b. Specification: Native only
(1) ¡Ù200 cd/¢T
3.10 Black Level
a. Gray Scale Condition Input signal: 32 Gray scale (Primary mode)
Controls : CONT./BRT. primary setting, other shipping setting
condition.
b. Specification¡GNative (1) The first bar from black of gray scale pattern shall be cut off.
(2) The last bar from the bright of gray scale pattern shall be
discrimination.
3.11 Picture Quality
a. Condition BRT : MIN. ~ MAX.
CONT : MIN. ~ MAX.
*Inspection of picture quality shall be made at the distance of 50 cm in front of LCD surface.
b. Full White Signal
Condition : Input signal Full white signal
Specification: The following electrical defects shall not be so conspicuous.
(ITU-R 4.5 or better in primary mode, and ITU-R 4.0 or better in other modes)
(2) ringing, seam, etc.
(3) flicker, noise, beat, etc.
(4) shading, etc.
(5) saturation of video power supply, etc.
c. Inverted Crosshatch Signal
Condition : Input signal Inverted crosshatch signal
Specification: Following electrical defects shall not be so conspicuous.
(ITU-R 4.5 or better in primary mode, and ITU-R 4.0 or better in other modes)
(1) video ringing, over shoot, smear, etc.
(2) vertical jitter, horizontal jitter, picture vibration, etc.
d. Gray Scale Signal
Condition : Input signal Gray scale signal
Specification: Following electrical defects shall not be so conspicuous.
(ITU-R 4.5 or better in primary mode, and ITU-R 4.0 or better in other modes)
(1) Oscillation, noise, beat, shading, etc.
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3.12 EDID DATA
a. Condition : Maintain Mode
b. Specification : FOR RGB
DDC EDID 128 BYTES DATA STRUCTURE
No. Item EDID Data or Definition
00 Header 00 FF FF FF FF FF FF 00
08 ID Manufacturer Name 10 8C (DDL)
0A ID Product Code 00 00 (0)
0C ID Serial Number 00 00 00 00 (0)
10 Week Of Manufacture Week of manufacture
11 Year Of Manufacture Year of manufacture
12 EDID Version,Revision 01 03
14 Video Input Definition 7E(Analog signal,0.700,0.000(0.7
Vp-p),Black-to-Black, ,Separate Syncs, Composite Syncs, Sync
on Screen )
15 Max. H. Image Size 25 (37cm)
16 Max. V. Image Size 1E(30cm)
17 Display Transfe 78(2.20)
Charac.(gamma)
18 Feature Support(DPMS) EB(Stand-by,Suspend,Active Off supported,R/G/B color display)
19 Color Characteristics Per TFT measurement(See NOTE1)
23 Established Timings AF--(720*480@70Hz) ,(640*480@60Hz),(640*480@72Hz),
(640*480@75Hz),(800*600@56Hz),(800*600@60Hz)
EF--(800*600@72Hz),(800*600@75Hz),(832*624@75Hz)
(1024*768@60Hz),(1024*768@70Hz),(1024*768@75Hz)
(1280*1024@75Hz)
00--
26 Standard Timing Identification 81 80-- 1280*1024@60Hz; 71 4F-- 1152*864@75Hz z;
81 40--1280*960@75Hz; 31 46-- 640x480 @66Hz
01 01-- 01 01--
01 01-- 01 01--
36 Detailed Timing 1 Description BC 34 00 98 51 00 2A 40 10 90 13 00 78 2D 11 00 00 1E
(1280*1024@75Hz,Video Size:376mm*301mm,No Stereo)
48 Detailed Timing 2 Description 00 00 00 FF 00 20 44 44 4C 30 30 30 30 30 20 20 20 20
Monitor S/N: DDL00000
5A Detailed Timing 3 Description 00 00 00 FD 00 37 4B 1E 50 0E 00 0A 20 20 20 20 20 20
(Vf:55~75Hz,Hf:30~80KHz,Pixel Clock:140MHz)
6C Detailed Timing 4 Description 00 00 00 FC 00 4C 4D 31 39 30 34 0A 20 20 20 20 20 20
(LM1904)
7E Extension Flag 00
7F Checksum Per DDC Specification
NOTE 1 Panel Specification (HSD190ME13)
Color characteristics R: x=0.6475 y=0.3271 Store in EDID data=
G: x=0.2920 y=0.6143 FD 56 A5 53 4A 9D 24 14 4F 54
B: x=0.1416 y=0.0791
W: x=0.3096 y=0.3301
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4. Circuit Description
A. A/D converters
The ADC is a 7-bit 4-channel analog-to digital converter ,the structure of these ADCS is 7-bit
successive approximation ,analog voltage is supplied from external sources to the A/D input pins and
the result of the conversion is stored In the 7-bit data latch registers(ADC0_REG~ADC3_REG).The
A/D cannels are activated by cleaning the correspondent control bits in the ADC_CON control register,
when users write"1" into one of the enable control bits(EN_ADC0~EN-ADC3),its correspondent I/O pin
will be switched to the A/D Converter input pin
The conversion will be started by setting STRT_ADC Bit, user can monitor this bit to get the valid A/D
channel, its latched data is meaningful, the analog voltage to be measured should be stable during the
conversion operation and the variation will not exceed 1 LSB for the best accuracy in measurement
B.Scalling controller
1. VGA front end
l Built-in triple high speed ADC,PLL for analog RGB input
l Supports both non-interlaced and interlaced RGB graphic input signals
l Input signal ranges from 0.55-0.9v
l Provides RGB analog gain and offset control
l Support 64 steps (one cycle of pixel)of phase adjust
l ADC sampling rates are up to 110MHZ for x type, 160MHZ for E type Supports analog SOG
input
2. YUV Front End
l Support ITU-R BT.656 8-bit input
l Built-in YUV to RGB color space converter
3. Display
l Supports data swap to fit any panel data alignment for PCB Layout
l Built in LVDS transmitter
l Supports spectrum of output clock
4. Hot interface
l Support serial 2-wire IIC bus
l Provides 2 channel PMW
5. Power
l Power supply
l Less than 1.3W
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6. Video processor
l Flexible de-interlacing unit for VGA and digital YUV video input data
l Auto-calibration function for quick vide cantering, clock adjust and phase adjust
l Independent horizontal and vertical zoom in/out algorithm
l Enhanced interpolation algorithm for optimal image quality
l Provides RGB digital gain and offset control
l Dithering function supports 24-bits quality for 18-bit panel
l SRGB matrix mapping support
l 10-bit programmable gamma table for panel compensation
l Supports Hue and saturation adjustment
l Built-in POST pattern
Timing controller
l Support RSDS output
l Provides 4 differential data pairs to support 6 or 8-bit RGB data bus
l 10 General Purpose output allow suitability to different production environments
l Provide single pixel (18-24-bit) or dual pixel (36-48-bit)
l Programmable RSDS swing level
l Supports line offset function for two bank system panel
l 12 GPO internal controls 10 GPO external pin outputs
l Supports data swap to fit any panel data alignment for PCD layout
Sync Processor
l Supports separate, composite and TTL-level sync-on-Green (SOG) sync input
l Polarity detection for HSYNCI and VSYNCI
l Fast mode change detection function
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Pin description
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C.NT68521
The NT68521 is a high quality image and highly integrated LCD controller, it combines a triple ADC,
scaling engine, OSD, LVDS and timing controller
The ADC supporter up to 160MHZ pixel rate and built-in a low jitter digital for sampling input video that
provides more stabile ,clear data for display,
The NT68521 Built-in DSP engine execute image zoom-in, zoom out function, the zoom feature provides
linear scaling up/down that makes it easier to fit different panel resolutions
The OSD provides a bit map,multi-color RAM front that is more flexible to create the customer' OSD the
s
output provides multi-interface and for general panel solutions ,the display provides LVDS interface
The NT68521 also has a built-in spread spectrum feature to provide low EMI solutions ,SRGB for video
color space convert ,post pattern for manufacturing test ,de-interlace feature receives interlace video
input and display on TFT panels
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5. Adjustment Procedure
1. Function test
1.1 products
19" LCD Monitor
1.2 test equipment
(2-1). One PC (Windows system);two RS-232 PORT¡ACOM1: signal resolution¡BCOM2: color
meter¡C
Print PORT: connection with IIC/RS-232 Adapter Board
(2-2).Color Meter: MINOLTA. CA-110 is 21cm apart form the screen (eg: BM-7 distance is 50cm;
Field = 2.0)
(2-3). IIC/RS-232 Adapter Board (Set IIC Port)
(2-4). (TOPCON BM-7 or CA110) will be upright with Monitor
(2-5).each equipment' connection circuit diagram, pls see the appendix two and three.
s
Optical Black Pasteboard Cylinder
LCD Module
MINOLTA CA-110
210mm
(3).Setup
( 3-1 ).with 32 level gray scale Pattern
(3- 2 ).Brightness Set 50; Contrast Set 50.
( 3-3 ). Auto White Balance:
Entered into Maintain mode then choose Menu (F199N) Icon ,and press (+) Key to enter
into Maintain Menu; choose Auto Color ,press down (+) Key to implement Auto Color
Adjust¡C
(4).adjust specification:
At Brightness=50, Contrast=50 Full White Pattern
6500°K: x=0.313±0.015;y=0.329±0.015
9300°K: x=0.283±0.015;y=0.297±0.015
S RGBK : x=0.313±0.015;y=0.329±0.015
Brightness=50¡AContrast=50 Full White ¡Ù180 CD/M2
(5). Applicable program exercitation (use the color temperature adjust program to adjust color
temperature)
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(5- 1).WBA.exe, enter the pattern as follow:
(5- 2 ).at this time .pls press the open document as follow, choose the project document and
press the open button, the pattern is as follow
note: pls choose the related program depending on the model and panel of the product
( 5-3 ).pls choose" (Set)"à"Communication", should alter the communication setup,the patter is
As follow:
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( 5-4 ). Pls select" Set"à"Range", ADC setup range, pattern is as follow:
LM1901XXND: Gain 0 ~ 255 Offset 0 ~ 255
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(5-5 ). Pls select"(Set)"à"Color Temperature" setup the color temperature specification, the
7500K of the program is"SRGB"color temperature ,pattern as follow:advise the adjust
tolerance will be ±3
( 5-6 ). Pls select" Set"à"Color Analyzer" setup color analysis fixture Type,at present we can
Use CA-110 and BM-7. Chroma7120,the pattern as follow:
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( 5-7 ). Pls select" Set"à"Video Generator" to set the signal generator' Type and
s
Timing/Pattern, refer to the pattern as follow:
( 5-8 ) pls select "Set"à"Default RGB Gain
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( 5-9 ). Begin to adjust;pls press the tools menu Icon, Icon, at this time the program will
go on the color temperature adjusting, refer to the pattern as follow.
(6).when adjusting the color tempreture,after the auto adjust, you must save the document and
then turn
On the machine, test the color and temperature:
6500°K: x=0.313±0.015;y=0.329±0.015
9300°K: x=0.283±0.015;y=0.297±0.015
SRGB : x=0.313±0.015;y=0.329±0.015
(7).POWER SAVING& power test¡RINPUT 1280x1024 @75Hz FULL WHITE, insert the signal
to D-SUB&DVI . CHECK whether the POWER SAVING is normal, POWER SAVING LED
whether the dark orange light is normal and the power is within the specification.
(8).gray scale test¡RInput1280x1024 @75HZ 32 gray scale pattern
Before check the patter¡B first execute auto adjust once based on contrast DAC 0¡ã100
at
display
The gray scale should be evidently, on the contrary, when it died down and the pattern will
be darker and darker¡C
(9).DDC LOAD: pls select corresponding Model' DDC document as the loading
s
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2. Firmware and EDID upgrade/update Methods
. MCU software written:
2-1. Used equipment:
(1).one PC (Windows system),one Print PORT: connect withIIC/RS-232 Adapter Board
(2). IIC/RS-232 Adapter Board(Set IIC Port)
2-2. applicable program operate:
(1).execute Writer.exe to enter the pattern as follow
(2). Then pls press Load Hex document as follow
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(3) after opening the Hex document that you choose,pls select the NT68F633 (64K)
(4) begin to load MCU software: after press" AUTO", then at this time will be loading the MCU
software,pls see the pattern as follow:
2. I/P 1280x1024 @75Hz CROSS TALK (PATTERN63) FH=79KHz,FV=75Hz
2-1.input the signal to D-SUB to execute AUTO ADJUSTING function¡Athen CHECK the pattern
whether have interaction noise.(if still have noise ,we can slightly adjust the clock or phase
menu)
2-2. I/P1280x1024 @75Hz 32 Gray pattern (PATTERN48) CHECK the pattern can' lack of color or
t
Have too much color¡D
2-3 TIMING CHECK
640x480@60/66/72/75Hz 800x600@56/60/72/75Hz
1024x768@60/70/75Hz 1280x1024@60/75Hz
832x624@75Hz 1152x864@75Hz
1280x960@60Hz 720x400@70Hz
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3 Disassembly Procedure
1.Remove the hinge cover
2.Unscrew 8 pcs screws
3.Unscrew 2 pcs screws
1 2
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4. Insert plastic flake to hole ,and pull the flake along the gap between the bezel and housing, to
separate the housing from bezel.
5. Pull out the speaker waire from the main board
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6 Take out housing part;
7 Remove 4pcs screw,take out ;
shield cover
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8 . Remove the earth screw,push up the signal cable from the frame, pull up signal cable
connecter from the main board ;
9 Pull out the 4pcs lamp wire from power board;
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10 Unscrew 4pcs screw;
11 Take the power board up from the frame;
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12. Tear off the aluminum foil where cover the FFC cable,push the connert hook forward ,pull
out FFC cable from the main board;
push the connert
hook forward
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push 2pcs hook
forward
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15. Unscrew 2 pcs screws
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Frame
16. Release all hooks around the Panel for remove the bezel;
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17. Remove bezel from the panel;
18. Unscrew 2pcs screw with at the panel side
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4 Packing Procedure
1.1 Paste production film to protect the monitor screen.(Figure 1)
tape Production film
1.2 Put the monitor in the PE bag and seal bag with type (Figure 2)
tape
1.3 Put the cushions on the monitor.(Figure 4)
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1.4 Put the base in the EPE bag. and then,place the base on the cushions ,as figure
1.5 Place the monitor into the carton and then put all accessories into carton .At last, close the carton.
Use `s Guide
Power cord Base Audio cord
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6. Troubleshooting Flow Chart
Main Procedure
Start
Connect all of devices to
the LCD monitor
Power On
A. Power Circuit
Is indicator LED No
Troubleshooting
light?
Yes
1
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1
B. Backlight
Is backlight on? No
Troubleshooting
Yes
C. Performance
Display Performance No
Troubleshooting
O.K.?
Yes
D. Function
Function Adjustment No
Troubleshooting
O.K.?
Yes
E. Audio
Audio Function O.K.? No
Troubleshooting
No Trouble Found
End
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A. Power Circuit Troubleshooting
Start
Change AC/
DC Adapter
End
Retry Power
On
Change Main
End
Board & Retry
No Trouble Found
End
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B. Backlight Troubleshooting
Start
Change
Inverter and End
Retry
Change
Main
End
Board&
Retry
Backlight
Change End
Module
No Trouble Found
End
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C. Performance Troubleshooting
Start
Screen is Change VGA Change Main
Yes No
scrolling? Cable Board
YES YES
NO
Screen is YES Change NO Change Main
NO Change LCD
flickering? Inverter Board Board Module
YES YES YES
NO
LCD Line Defect? YES Change LCD
Module
YES
NO
Bad Uniformity? YES Change LCD
Module
YES
NO
Is screen white? YES Check
Connector
NO Change Main
Board
YES YES
NO
2
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2
Screen with noise or line Yes Prss Reset Button from Yes End
bar? front panel control
No
Change Main
Board
No
Make sure relution is set
Screen is smaller? Yes
at default
No
Yes Reset O.K.?
No No
Change Main
Yes
Board
No Trouble Found
End
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D. Function Troubleshooting
Start
Change
Control Menu not No Control Board
Functioning? and Retry?
No
Change Main
Yes Board
Yes
No Trouble Found
End
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E. Audio Troubleshooting
Start
Make sure sound output, Audio
cable is OK.
Change
No Sound Yes
Speaker
No
Change
Sound is broken? Yes
Speaker
No
Volume Change Main
Yes
Unadjustable? Board
No
No Trouble Found
End
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7. Recommended Spare Parts List
RECOMMENDED SPARE PARTS LIST (Q9b-2)
ViewSonic Model Number: VS11201
Serial No. Prefix: Q5W Rev: 1b
Item Description ECR/ECN ViewSonic P/N Universal number# Q'ty
1 Accessories: Cable(CON).POWER CORD/AC A-00005760 W40218A022631 1
2 PC Board MAIN BOARD ASSY B-00005755 XLMF179040001 1
3 KEY BOARD ASSY B-00005756