ViewSonic G90f/B-3 Manuel utilisateur

Model No. VS23283

19” Digital Controlled Color Monitor

Service Manual

ViewSonic G90f/B-3

ViewSonic

381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

(G90f/B-3_SM_944 Rev. 1a – Jan. 2005)

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.

Revision History

Trademarks

ViewSonic is a registered trademark of ViewSonic Corporation.

All other trademarks used within this document are the property of their respective owners.

Optiquest is a registered trademark of ViewSonic Corporation.

DCN Number ECR Number

Documents Number Description of Changes EditorRevision SM Editing Date

1a 11/01/05 4877 Initial Release A. Lu

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TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Trouble Shooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjusting Procedure

8. Exploded Diagram And Spare Parts List

11. PCB Layout Diagrams

100

105

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WARNING!

This service information is designed for experience repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service

a product.

Products powered by electricity should be serviced or repaired only by experienced professional technicians.

Any attempt to service or repair the product or products dealt within this service information by anyone else

could result in serious injury or death.

1. CAUTION

Nomodificationof any circuitshouldbe attempted. Service work shouldonlybe performed afteryouare thoroughly

familiar withall ofthefollowingsafetychecks andservicingguide lines.

2. SAFETY CHECK

Care should be taken while servicing this CRTdisplaybecause of thehigh voltageused in the deflectioncircuits.

These voltagesare exposed in suchareas as the associated flybackandyoke circuits.

3. FIRE &SHOCK HAZARD

3-1Insert an isolationtransformerbetweentheCRTdisplayandACpower linebefore servicingthe chassis.

3-2In servicingpayattentionto originallead dress especiallyinthe highvoltage circuit. If a short circuit is found,

replace all parts whichhave been overheated as a result of the short circuit.

3-3Allthe protective devices munt be reinstalled per original design.

3-4Solderingmust beinspected for possible cold solderjoints, frayed leads, damagedinsulation, solder splashes or

sharp solder points. Be certain to remove all foreignmaterial.

4. LEAKAGE CURRENT COLD CHECK

4-1Unplug theACcord and connect a jumper between the twoprongson the plug.

4-2Turn the CRTdisplaypower switch “on”.

4-3Measure the resistance valuewith anohmmeter betweenthe jumpered ACplugandeach exposed metallic part

onthe CRTdisplaysuchas themetal frame, screwheads, control shafts, etc. When the exposed metallic part has

a return pathtothe chassis, the readingshouldbe 1.8 megohm minimum.

5. LEAKAGE CURRENT HOT CHECK

5-1PlugtheACcord directly into theACoutlet. Do not use an isolationtransformer duringthischeck.

5-2 Connect a 1500 ohm, 10 watt resistor, paralleled by a 0.15uF capacitor between each exposed metallic part and

a good earth ground (as shown in Fig.1).

5-3 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.

1. Precautions And Safety Noticess

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5-4 Move the resistor connection to each exposed metallic part and measure the voltage.

5-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.

5-6Voltagemeasured mustnot exceed 7.5 volt RMS, fromany exposed metallic part to ground A leakage current

tester maybe used inthe above hot check, in whichcase any currentmeasured mustnot exceed 5.0 milliamp. In

the case of a measurement exceeding the 5.0 milliamp value, a rework is required to eliminate the chance of

shock hazard.

Note：High voltage is present when this CRT display is operating. Always discharge the anode of the picture

tube to the display chassis to prevent shock hazard. AC VOLTMETER

INSTRUMENT'S

EXPOSED

METAL PARTS 1500 Ω10W

0.15μF

Fig. 1

(EARTH

GROUND)

6. IMPLOSIONPROTECTION

Picture tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage and

scratchingduringinstallation.Use only Panasonic replacement picture tubes.

7. X-RADIATION

WARNING：The only potential source of X-Radiation is the picture tube. However when the high voltage circuit is

operating properly there is no possibility of X-Radiation problem. The basic precaution which must be exercised is to

keep the high voltage at the following factory-recommended level.

Note：

：：

：It is important to use an accurate periodically calibrated high voltage meter.

7-1 The procedure for adjusting high voltage isshown on page 33.

7-2If can not be adjust 25.0 KV at immediate service isrequired topreventthe possibilityof premature

component failure.

7-3 To prevent X-Radiation possibility it is essential to use the specified picture tube.

IMPORTANT SAFETY NOTICE

There are special components used in this CRT displays

which are important for safety. These parts are identified

by the international symbol !ontheschematic

diagram and on the replacement parts list. It is essential

that these critical parts should be replaced with

manufacture’s specified parts to prevent X-RADIATION,

shock, fire, or other hazards. Do not modify the original

design or this will void the original parts and labor

guarantee.

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GENERAL SPECIFICATION

1. SCOPE

1.1 THIS SPECIFICATION DEFINESTHEPERFORMANCEOF G90f19 INCHMULTISYNC COLOR

MONITOR

1.2 PRODUCT CONFIGURATION

TBD

1.3 MAGNETIC REQUIREMENTS

AMERICA (-M) BH = 250 + 10mG, BV = 450 + 10mG

AUSTRALIA(A) BH = 270 + 10mG, BV = -570 + 10mG

2. INPUT REQUIREMENTS

2.1 AC POWER SUPPLY

2.1.1 POWER SOURCE 90~264VAC 50/60HZ

2.1.2 POWER CONSUMPTION LESS THAN 100W

2.1.3 INRUSH CURRENT LESS THAN 30AP. FOR 1/2 CYCLE AT 110V, LESS THAN 60 AP.

FOR ½ CYCLE AT 240V ON COLD STARTING

2.1.4 INPUT CURRENT 2.0 A MAX IN 110V

2.1.5 LEAKAGE CURRENT 3 mA AT AC 100V/240V

2.1.6 RIPPLE / NOISE SHOULD NOT CAUSE ANY VISIBLE INTERFERENCE

2.1.7 POWER CORD 1.83METER

2.1.8 SIGNAL CABLE 1.83METER

2.2 VIDEO INTERFACE

2.2.1 RGB VIDEO ANALOG 0.7 VP-P AND 1 VP-P POSITIVE INPUT IMPEDANCE 75 OHM

2.2.2 MAX PC VIDEO SIGNAL 950mV WITH NO DAMAGE TO MONITOR

2.2.3 MAX MAC VIDEO SIGNAL 1250mV WITH NO DAMAGE TO MONITOR

2.2.4 SYNC SIGNAL SEPARATE OR COMPOSITE HORIZONTAL AND VERTICAL SYNC TTL LEVEL

2.2.5 INPUT CONNECTOR

15 PINS MINI “D” SUB

PIN NO. SIGNAL PIN NO. SIGNAL

1 RED 9 5V OUT

2 GREEN 10 5V GROUND

3 BLUE 11 GROUND

4 GROUND 12 SDA

5 CHECK SIGNAL 13 H. SYNC

6 R RETURN 14 V. SYNC

7 G RETURN 15 SCL

8 B RETURN

2.2.6 SIGNAL MEMORY MODES 13 PRESET MODES

2.2.7 PLUG & PLAY VESA DDC1 / 2B

2. Specification

2.3 SCANNING FREQUENCY

2.3.1 HORIZONTAL30 KHZ TO 96KHZ

2.3.2 VERTICAL 50 HZ TO 180 HZ

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3. ADJUSTMENT CONTROL

3.1 USER CONTROL

3.1.1 POWER SWITCH

3.1.2 OSD KEY

1 MENU BUTTON

2ENTER / SELECT BUTTON

DOWN / DECREASE BUTTON

UP / INCREASE BUTTON

3.2 OSD ADJUSTMENT FUNCTION

Note：Press button to toggle between

all Controls that appear in pairs on the

Main menu1.

MA I N MENU 2

DEGAUSS

H/V MOIRE

OSD POS I T I ON

I NPUT LEVEL

VIEWMATCH COLOR

LANGUAGE

VIEWMETER

MEMORY RECA L L

EX I T : 1 SELECT : 2

OSD OSD

MA I N ME NU 1

CONTRAST / BR I GHTNESS

H.SIZE/POSITION

V.SIZE/POSITION

P I NCUSH I ON / BALANCE

TRAPEZO I D / PARALLEL

TOP / BOT TOM HOOK

ZOOM

TILT

EX I T : 1 SELECT :2

3.3 LED INDICATION

STATUS LED

NORMAL GREEN

POWER SAVING AMBER

POWER ON

OVER RANGE FREQUENCY AMBER

POWER OFF OFF

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4. ELECTRICAL SPECIFICATION

A. ELECTRICAL SPECIFICATION

4.1 STANDARD CONDITION OF MEASUREMENT

4.1.1 BRIGHTNESS – 50% FACTORY SHIPMENT CONDITION

4.1.2 CONTRAST – 100% FACTORY SHIPMENT CONDITION MAX

4.1.3 OTHER SW – FACTORY SHIPMENT CONDITION

4.1.4 BACKGROUND COLOR – BLACK

4.1.5 BRIGHTNESS 30 FL FULL WHITE

4.1.6 TEMPERATURE 0~40 °C HUMIDITY 5 ~ 90% NON-CONDENSING

4.1.7 POWER INPUT –AC 90~264V 50HZ / 60HZ

4.1.8 TERRESTRIAL MAGNETIC FIELD – NORTHERN HEMISPHERE MAGNETIC FIELD

4.1.9 WARM UP TIME – START TESTING 30 MINUTES OR MORE AFTER POWER ON

4.1.10 TIMING CHART – REFER TO ITEM 7.2.

4.1.11 AMBIENT LIGHTING ENVIRONMENT – 400 TO 600 LUX

4.1.12 CRT FACE TO EAST

4.2 CRT SPECIFICATION

ITEM SPEC

SIZE 19”

DIAGONAL 18”

DEFLECTION 90°

PERSISTENCE MEDIUM SHORT

PHOSPHOR

PITCH 0.25mm

MASK TYPE SHADOW MASK FLAT

FACE PLATE ANTI- REFLECTIVE, ANTI-STATIC

CRT SDI/M46QCK761X214

LPD/M46QEF903X21

4.3 POWER SAVING

4.3.1 POWER SAVING

HORIZONTAL

SYNC. VERTICAL SYNC. POWER

CONSUMPTION OSD INDICATOR POWER

LED

RECOVERY

TIME

YES YES < 100 W NORMAL GREEN N/A

NO YES < 4W POWER SAVING AMBER 10 SEC

YES NO < 4W POWER SAVING AMBER 10 SEC

NO NO < 4W POWER SAVING AMBER 10 SEC

<29 KHZ OR

> 96KHZ

<49 HZ OR

>181 HZ

< 4W FREQUENCY OVER

RANGE AMBER 10 SEC

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B. SCREEN CHARACTERISTICS

4.4 PICTURE DISPLAY SIZE

HORIZONTAL SIZE 352+4 mm

VERTICALSIZE 264+

4 mm

4.5 PICTURE CENTER

PRIMARY MODE (1280X1024/75HZ) LA-BL < 4 mm, LC-DL < 4 mm.

OTHERS MODE LA-BL < 4 mm, LC-DL < 4 mm.

4.6 LINEARITY

H0RIZONTALFREQUENCY39KHZ~96KHZ

HORIZONTAL,ADJACENT 5%

HORIZONTAL,WORSTCASE 5%

VERTICAL,ADJACENT 5%

VERTICAL,WORSTCASE 5%

H0RIZONTAL FREQUENCY 31KHZ~38KHZ

HORIZONTAL,ADJACENT 7%

HORIZONTAL,WORSTCASE 7%

VERTICAL,ADJACENT 7%

VERTICAL,WORSTCASE 7%

12 x 10

INPUT SIGNAL : BLOCK PATTERN

4.7 PICTURE DISTORTION

4.7.1 TRAPEZOID / PARALLELOGRAM

PICTURE

2mm

268mm

357mm

TRAPEZOID:

HORIZONTAL <= 2mm

VERTICAL <= 2mm

PARALLEL <= 2mm

2mm

4.7.2 PINCUSHION / BARREL / PIN-BALANCE

PICTURE

PINCUSHION <

BARLEL < 1.5mm

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4.7.3 TILT

ABAA C 10

A B

PICTURE

A - B <= 2mm.

BEZEL

4.8 MISCONVERGENCE

PICTURE

357mm

268mm

ZONE A <= 0.25mm

ZONE B <= 0.30mm

ZONE C <= 0.35mm

4.9 FOCUS

4.9.1 UNDER THE CONDITION OF BRIGHTNESS CENTER AND CONTRAST MAXIMUM

“ ME “ PATTERN CAN BE SEEN CLEARLY BY USING THE 1280X1024 KHZ@85HZ IF

NECESSARY, LIMIT SAMPLE AGREED BY BOTH PARTIES WILL BE MADE FOR

FINAL FOCUS JUDGMENT.

4.10 JITTERS

4.10.1 NO VISIBLE

4.11 WHITE BALANCE

4.11.1 COLOR TEMPERATURE USING THE CIE COLOR TEMPERATURE COORDINATE

SYSTEM

COLOR 9300OK X = 0.283±0.015; Y = 0.297±0.015

COLOR 6500OK X = 0.313±0.020; Y = 0.329±0.020

COLOR 5000OK X = 0.346±0.020; Y = 0.359±0.020

4.11.2 COLOR PURITY IMPURITY SHOULD NOT APPEAR IN THE PATTERN OF ALL

GREEN ALL RED ALL BLUE OR ALL WHITE

4.11.3 COLOR TRACKING: WHEN THE FULL WHITE PATTERN IS DISPLAYED AT PRESET

(ONLY FOR 9300OK) CONDITION. THE DIFFERENCE OF WHITE BALANCE

BETWEEN CONTRAST 30 FL AND LOW CONTRAST 10 FL MUST BE LESS THAN

FOLLOWING VALUE

x AT CONTRAST 30 FL - x AT 25.75 FL < 0.005

y AT CONTRAST 30 FL - y AT 25.75 FL < 0.005

AND: x AT CONTRAST 25.75 FL - x AT 10 FL < 0.009

Y AT CONTRAST 25.75 FL - Y AT 10 FL < 0.009

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