ViewSonic G220f-1 User manual

Service Manual
ViewSonic G220f-1
Model No. VCDTS23852-1M
21” Digital Controlled Color Monitor
(G220f-1_G220fB-1_SM Rev. 1b Mar. 2006)
ViewSonic381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
G220fB-1
VCDTS23852-2M

ii
Copyright
Copyright
¤
2006by ViewSonic Corporation. All rights reserved. No partof 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
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 Date Description Of Changes Approval
1a 5/23/02 Initial Release DCN-2248 K.Yang
Confidential – Do Not Copy
ViewSonic Corporation G220f-1_G220fB-1
1b 3/30/06
Modify model number of cover page Jamie Chang

ViewSonic Corporation iii
TABLE OF CONTENTS
1. PRECAUTIONS AND NOTICES...............................................................................1
2. SPECIFICATIONS.....................................................................................................4
3. FRONT PANEL FUNCTION CONTROL DESCRIPTION....................................16
4. CIRCUIT DESCRIPTION........................................................................................19
5. BLOCK DIAGRAM .................................................................................................24
6. SCHEMATIC DIAGRAMS.......................................................................................25
7. ADJUSTING PROCEDURE....................................................................................41
8. TROUBLE SHOOTING FLOW CHART..................................................................51
9.EXPLODED DIAGRAM AND SPARE PARTS LIST...............................................57
Confidential – Do Not Copy
10.DISASSEMBLY INSTRUTCTION............................................................................59
11.PCB LAYOUT DIAGRAMS......................................................................................61
12.RECOMMEND SPARE PARTS LIST.......................................................................63
G220f-1_G220fB-1

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1. PRECAUTIONS AND NOTICES

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ViewSonic Corporation 2Confidential – Do NotCopy
G220f-1_G220fB-1

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ViewSonic Corporation 3Confidential – Do NotCopy
G220f-1_G220fB-1

1.0 SCOPE
This specification defines the performance of C110 SAW 21inch digital OSD controlled color monitor. This color monitor
is designed to accept timing signals within horizontal frequency ranging from 30KHz to 110KHz and vertical frequency
ranging from 50Hz to 180Hz. It is compatible with VGA, super VGA, and enhanced VESA standards for 640x480,
800x600, 1024x768, 1280x1024 and 1600x1200 non-interlaced display. All parameters within this specification must be
met at any line voltage, line frequency and temperature within the limits specified in this document.
2.0 GENERAL PERFORMANCE
2.1 Display mode & resolution
15 settings of display parameters are pre-adjusted and stored in memory for user’s convenience, another 10 settings
of memory are available for user to adjust and store parameters.
PRESET MODE FREQUENCY SYNC POLARITY
RESOLUTION HOR. VER. HOR. VER.
640x400 31.47KHz 70Hz - +
640x480 31.47KHz 60Hz - -
640x480 43.269KHz 85Hz - -
800x600 46.875KHz 75Hz + +
800x600 53.674KHz 85.01Hz + +
1024x768 60.24KHz 74.927Hz + +
1024x768 60.023KHz 75.029Hz + +
1024x768 68.677KHz 84.997Hz + +
1280x1024 79.976KHz 75.025Hz + +
1280x1024 91.146KHz 85.024Hz + +
1600x1200 93.750KHz 60.00Hz + +
832x624 49.714KHz 75.534Hz - -
1152x870 68.681KHz 75.061Hz - -
1600x1200 106.25KHz 85Hz + +
2.2 Scanning Frequency ：30KHz to 110KHz for Horizontal
50Hz to 180Hz for Vertical
2.3 Display Size ：390mm x 290mm for all modes
2.4 Display Brightness ：30±3 FL at center of screen (Full white pattern)
33±3 FL at center of screen (20% window block pattern)
(Brightness set to 50% & Contrast set to 100%)
2.5 White Balance ：CIE coordinates
9300K
x = 0.283±0.015
y = 0.297±0.015
6500K
x = 0.313±0.015
y = 0.329±0.015
5000K
x = 0.346±0.015
y = 0.359±0.015
2.6 Power Input Range ：AC 90 to 264V, 50/60Hz ± 3Hz
2.7 Power Consumption ︰115 Watts max.
2.8 Degauss ：both Automatic and Manual
ViewSonic Corporation 4Confidential – Do NotCopy
2. SPECIFICATIONS
G220f-1_G220fB-1

2.9 Display Data Channel ︰DDC1/2B
2.10 Mechanical Adjustment ：with Tilt & Swivel base
2.11 Display controls ：a. Power on/off switch
b. Digital On Screen Display controls`
Contrast Brightness
Horizontal size Horizontal Position
Vertical size Vertical Position
Zoom
Pincushion Pin Balance
Trapezoid Parallel
Top Hook Bottom hook
Tilt H/V Convergence
Degauss
H- moiré V- moiré
Color ( 9300, 6500 5000 , user color )
Input level
Language
OSD H-position OSD V-position
View meter
Memory recall Exit
ViewSonic Corporation 5Confidential – Do NotCopy
G220f-1_G220fB-1

3.0 REGULATORY REQUIREMENT
3.1 Safety Approvals
The unit design shall meet the standards of the following domestic and foreign agencies:
UL listed ：UL1950 listing (Information processing and business equipment)
CSA ：CSA C22.2 No.950 (Information technology equipment)
TUV ：EN60950 ( for business machines)
TUV/GS ：EN60950/EKI/ISO 9241-3,-7,-8
IEC Standard ：IEC 60950 (Information technology and business equipment)
MPRII ：MPR 1990：8 / MPR 1990：10
TCO99 (OPTION) ︰July, 1998 / Emission, Energe
3.2 EMI Emission Approvals
The unit shall meet following EMI specifications.
FCC Compliance ：FCC Rules and Regulations, Part 15, sub-part J, Class B
CE ︰EN55022, EN55024
3.3 DHHS
The unit must comply with all applicable radiation limit and labeling and licensing requirement of DHHS Rule 21
CFR Sub-chapter J for X-ray radiation limits.
ViewSonic Corporation 6Confidential – Do NotCopy
G220f-1_G220fB-1

4.0 INTERFACE REQUIREMENT
4.1 Power input requirements
4.1.1 Operating voltage range：90 ~ 264VAC , 50/60 ± 3Hz
4.1.2 Input Current at 120V
a. Operating ：2.0Amps RMS maximum
b. Inrush current ：40 Amps peak maximum
4.1.3 Input Current at 240V
a. Operating ：1.0 Amps RMS maximum
b. Inrush current ：60 Amps peak maximum
4.1.4 Power management
MODE H-SYNC V-SYNC POWER INDICATOR
NORMAL YES YES ≦115W GREEN
Power saving NO YES ≦10W AMBER
Power saving YES NO ≦10W AMBER
Power saving NO NO ≦2W AMBER
4.2 Signal Input Requirement
4.2.1 Connector
a. 15 pin D-sub high-density connector for video and sync signals. (See Appendix A for pin assignment)
b. Cable length ︰1.8meters with ivory color.
4.2.2 Video Signals
a. Red, Green, Blue channels analog input.
b. Amplitude ：0.7Vp-p/1Vp-p(OSD SLECT)
c. Polarity ：Positive bright, 0.7Vp-p for full intensity and 0Vp-p for black.
d. Impedance ：75 ohms±5%
4.2.3 Sync signal
a. Separate H and V sync or composite H+V sync.
b. Voltage level ︰Standard TTL
c. Input impedance ︰2KΩ
d. Polarity ︰Negative or Positive.
ViewSonic Corporation 7Confidential – Do NotCopy
G220f-1_G220fB-1

5.0 GENERAL DEFINITION AND TEST CONDITION
Unless otherwise specified, all QA tests to verify specifications must be performed under standard operating condition as
following.
5.1 Test signals
Chroma 2250 or Quamtum Data 903 video pattern generator.
5.2 War m-up time
30 minutes min. after power switch on with specified power line voltage and signal applied.
5.3 Direction
CRT neck should face magnetic west.
5.4 Ambient luminance
400 to 600 LUX.
5.5 Ambient magnetic field
The magnetic field shall be same as the earth magnetic field of the country where the product will be sold.
5.6 Ambient temperature
25 ± 5℃, less than 2℃fluctuation are allowed during test.
5.7 AC Input power
120VAC ± 10%, 60 ± 3Hz or 240VAC ± 10%, 50 ± 3Hz.
5.8 Inspection Equipment
a. Customer Graticule.
b. Minolta CA-100 color analyzer or equivalent.
c. Klein convergence error measurement gauge CM7AG.
d. Microscope 10X.
Unless otherwise specified, the brightness control must be set at 50%, and adjust contrast control to 33FL measured with
20% video white window pattern.
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G220f-1_G220fB-1

6.0 SCREEN DISPLAY & PERFORMANCE SPECIFICATION
6.1 CRT specification
Cathode ray tube to be used 21 inch flat (diagonal) tube with 90 degrees magnetic deflection and low voltage
focus.(Samsung M51QEQ991X001 )
6.1.1 Type ：21” in line anti-glare anti-static tube
6.1.2 Phosphor ：P22 medium short persistence phosphor
6.1.3 Dot trio pitch ：0.25mm
6.1.4 Light transmission ：50% Center
6.1.5 Implosion protection ：Tension band
6.2 Active Display Area
Horizontal ：390 ± 4.0mm
Vertical ：290 ± 4.0mm
All modes must be able to meet the above spec. by adjusting horizontal size and vertical size from front panel.
6.3 Picture Centering (refer to FIG.5)
Horizontal centering ：︱g3-g4︱≦4mm
Vertical centering ：︱g1-g2︱≦4mm
All modes must be able to meet the above spec. by adjusting horizontal position and vertical position from front
panel.
6.4 Tilt (refer to FIG.6)
Maximum ：2.0mm
6.5 Trapezoid Distortion (refer to FIG.4)
Vertical ：2.0mm
Horizontal ：2.0mm
6.6 Geometry Distortion
a. Barrel (refer to FIG.3)
Top & bottom ：a2≦1.5mm , b2≦1.5mm
Left & right ：c2≦1.5mm , d2≦1.5mm
b. Pincushion (refer to FIG.2)
Top & bottom ：a1≦2.0mm , b1≦2.0mm
Left & right ︰c1≦2.0mm , d1≦2.0mm
6.7 Linearity (refer to FIG.1)
Horizontal ︰( Xmax. – Xmin. ) / ( Xmax. + Xmin. )×100% ≦5%
Vertical ：( Ymax.–Ymin .) / ( Ymax. + Ymin. )×100% ≦5%
6.8 Size variation
Picture size deviation should not change beyond the specification with the following variance.
a. High Voltage variance, max.
From 1 to 20FL ：1.5mm
b. Temperature variance, max.
Across op. Range ：2.5mm
c. Line voltage, max.
Across op. Range ：2mm
d. Wavy, Jitter & Noise
Viewed at 50cm ：No objectionable.
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6.9 Centering drift across operating temperature
Horizontal maximum ：4mm
Vertical maximum ：4mm
6.10 Size control range
Horizontal ：Max ≧400, Min ≦350mm
Vertical ：Max ≧300, Min ≦260mm
6.11 Turn off spot
No persistent spot when turn off the monitor.
6.12 Color Tracking
When the 20% window block pattern is displayed at preset color condition, the difference of white balance between
contrast max. and low contrast (10FL) must be less than following value:
∣x (at 30FL) - x (at 10FL)∣≦0.015
∣y (at 30FL) - y (at 10FL)∣≦0.015
6.13 Contrast control range
Set brightness control to raster just cut-off, adjust contrast control from minimum to maximum.
The control range must be ：No less than 12db.
Calculated by the formula = 20 log luminanceMin.
luminanceMax.
6.14 Video Amplifier response
a. Rise / Fall time ：Less than 7ns
b. Over shoot ：10% max., first over shoot
Note：Video rise / Fall times are measured at the cathode and actual achieved value calculated
using the following formula：
RT = 2222 SR-PR-GR-RM
Where, RT = Specified rise time
RM = Measured rise time
GR = Generator rise time
PR = Probe rise time
SR = Scope rise time
6.15 Focus
With the active video adjusted with a screen brightness of 25FL at center. (full white pattern measured at center)
The focus through out the screen shall be such that all dots and characters of each screen field are individually
distinguishable.
6.16 Misconvergence
Zone A ：0.25mm
Zone B ：0.35mm
The zone area are defined as follows：
Zone A ：The circle of diameter equals to the active video height.
Zone B ：Active display area except Zone A.
6.17 Purity
No perceptible hue variation over the entire visible area when checked with 20FL full white pattern and relative
luminance of full red, green and blue pattern.
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6.18 Retrace time
Horizontal ：2.2us
Vertical ：500us
6.19 Luminance uniformity
Measure the luminance of corners and center while display full white pattern. The luminance uniformity must be no
less than 75% when calculated by the formula：
100%
centerofluminance
cornerlowestofluminancethe ×
6.20 Arc-over protection
The CRT and associated circuitry shall be protected against arc-over from the anode and any of the CRT electrodes
except heater. The performance of the arc-over protection circuitry and the adequate ground shall be evaluated by
arcing test fixture discharge to the cathode of the CRT 50 times. This shall not result in any permanent damage.
7.0 ENVIRONMENTAL REQUIREMENTS
The monitor shall be operated reliably within the following operating condition and may be safely stored within the non-
operating condition.
7.1 Temperature
Operating ：0 to +40℃
Storage ：-40 to +60℃
7.2 Humidity (Relative)
Operating ：10 to 80% non-condensing
Storage ：0 to 90% non-condensing
7.3 Altitude
Operating ：0 to 15,000 feet ASL
Storage ：0 to 40,000 feet ASL
8.0 VERY LOW RADIATION FIELD (OPTION)
Model LR has lower magnetic and electric radiated field emissions. Internationally agreed Standard have not yet been
established. The LR model shall meet the Swedish MPRII limits：
Measurement Freq. 5Hz – 2KHz 2KHz – 400KHz
Alt. Electric Field < 25V/m RMS < 2.5V/m RMS
Alt. Magnetic Field < 250nT RMS < 25nT RMS
9.0 MECHANICAL PERFORMANCE & TRANSPORTATION
9.1 Vibration (packaged, non-operating)
General test
Ramdom ︰5~250Hz , 1.Grams
Period ︰60 Minutes/Axis
No electrical or mechanical damage shall occur after the test.
9.2 Packaged unit drop
The packaged unit shall not sustain any damage when exposed one drop of 46cm each onto one corner, three
adjacent edges, and six faces of the package.
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G220f-1_G220fB-1

10.0 RELIABILITYAND SERVICEABILITY
10.1 Mean time between failure (MTBF)
The calculated MTBF shall not be less than 100,000 hours of continuous operation at 25℃when calculated
according to MIL-HDBK-217F and demonstrated to exceed 60,000 power-on hours. The calculation shall not
include CRT.
10.2 Mean time to repair (MTTR)
The MTTR must be less than 30 minutes.
10.3 Fail rate
The product failure rate per one year shall be less than 1.5%.
11.0 PHYSICALSPECIFICATION
11.1 Overall dimension
Height ：508mm
Width ：500mm
Depth ：488mm
11.2 Weight
Net weight ：27.0Kg
11.3 Mechanical adjustment
Tilt ：-5 / +15 degrees
Swivel ：-90 / +90 degrees
11.4 Outer surface
Material ：PC+ABS 94-5V
Color ：L*=77.71+/-0.5,a*=-.10+/-0.35,b*=2.4+/-0.50
11.5 Packaging
11.5.1 Carton dimension
Height ：627mm
Width ：652mm
Depth ：746mm
11.5.2 Shipping weight
33.0 Kg
11.6 Product accessory
a. User’s manual
b. Power cord
ViewSonic Corporation 12 Confidential – Do NotCopy
G220f-1_G220fB-1

APPENDIX A, VIDEO CONNECTOR PIN ASSIGNMENTS
Monitor interface signal definition for VGA monitors
1. Red
2. Green
3. Blue
4. Ground
5. S/T
6. Ground (Red return)
7. Ground (Green return)
8. Ground (Blue return)
9. +5V
10. Ground
11. Ground
12. SDA
13. Hor. Sync
14. Ve r t . S y n c
15. SCL
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G220f-1_G220fB-1

Vertical
Y1
Y2
Y3
Y4
Y5
Y6
Y12
:
:
:
X1 X2 X3 X4 X5 X6 X16
Y
..................
X
Fig. 1
Fig. 2
a1
AB
c1 d1
b1
DC
Fig. 3
a2
AB
c2 d2
b2
DC
ViewSonic Corporation 14Confidential – Do NotCopy
G220f-1_G220fB-1

Fig. 4
AB
DC
290mm
390mm
2.5
2.5
2.5 2.5
Fig. 5
390mm
290m
m
g4
g2
g1 g6
g3
g5
Fig. 6
390mm
290mm 2.0mm
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G220f-1_G220fB-1

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ViewSonic Corporation 16 Confidential – Do NotCopy
3. FRONT PANEL FUNCTION CONTROL DESCRIPTION
G220f-1_G220fB-1

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