ViewSonic E70F - 17" CRT Display Manuel utilisateur

Model No. VCDTS23125

17”Digital Controlled Color Monitor

Service Manual

ViewSonic E70f+SB-3

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

(E70f+SB-3_SM_832 Rev. 1a – May 2004)

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

Revision Date Description Of Changes Approval

1a 05/13/04 Initial Release DCN- 4412 Angela Lu

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.

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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

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WA R N I N G !

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

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 lines.

2. SAFETY CHECK

Care should be taken while servicing this CRT display because of the high voltage used in the deflection circuits.

These voltages are exposed in such areas as the associated flyback and yoke circuits.

3. FIRE & SHOCK HAZARD

3-1 Insert an isolation transformer between the CRT display and AC power line before servicing the chassis.

3-2 In servicing pay attention to original lead dress especially in the high voltage circuit. If a short circuit is found,

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

3-3 All the protective devices munt be reinstalled per original design.

3-4 Soldering must be inspected for possible cold solder joints, frayed leads, damaged insulation, solder splashes or

sharp solder points. Be certain to remove all foreign material.

4. LEAKAGE CURRENT COLD CHECK

4-1 Unplug the AC cord and connect a jumper between the two prongs on the plug.

4-2 Turn the CRT display power switch “on”.

4-3 Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metallic part

on the CRT display such as the metal frame, screwheads, control shafts, etc. When the exposed metallic part has

a return path to the chassis, the reading should be 1.8 megohm minimum.

5. LEAKAGE CURRENT HOT CHECK

5-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.

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.

5-6 Voltage measured must not exceed 7.5 volt RMS, from any exposed metallic part to ground A leakage current

tester may be used in the above hot check, in which case any current measured must not 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.

NoteΚHigh 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 Ө10W

0.15ӴF

Fig. 1

(EARTH

GROUND)

6. IMPLOSION PROTECTION

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

scratching during installation. Use only Panasonic replacement picture tubes.

7. X-RADIATION

WA RN I NG ΚThe 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.

NoteΚ

ΚΚ

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

7-1 The procedure for adjusting high voltage is shown on page 27.

7-2 If can not be adjust 25.0 KV at immediate service is required to prevent the possibility of 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 !on the schematic

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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A. GENERAL

1. ALL SPECIFICATION MUST BE MET OVER LINE VOLTAGE RANGE OF 90 VAC TO 264VAC 50HZ/ 60HZ, UNLESS OTHERWISE

2. OPERATING TEMPERATURE RANGE IS 0oC TO 40oC WITH A RELATIVE HUMIDITY OF 10% OR LESS TO 90%.

3. THE MONITOR MUST BE OPERATIONAL IN AN USABLE STATE WITHIN 30 SECONDS AFTER TURN-ON.

4. ALL SIGNAL LEVELS ARE MEASURED ASSUMING TERMINATION AT THE MONITOR'S INPUT JACKS OR IN ITS

CHARACTERISTIC IMPEDANCE.

5. AN AMBIENT LIGHTING LEVEL OF 400 TO 600 LUX IS ASSUMED WHEN SETTING BRIGHTNESS FOR RASTER

EXTINCTION THRESHOLD.

6. ALL PURITY RELATED SPECIFICATIONS MUST BE MET WITHOUT EXTERNAL DEGAUSSING.

7. ALL CONTROLS MUST HAVE EXCESS RANGE (NO CONTROL MAY BE LEFT AT AN END STOP WHEN PROPER

ALIGNMENT IS COMPLETED).

8. THE MONITOR IS NOT REQUIRED TO MEET SPECS DURING THE FOLLOWING BUT MUST TOLERATE, WITHOUT

DAMAGE TO THE CRT OR CIRCUITS, ANY SEQUENCY OR COMBINATION OF POWER ON AND OFF, SIGNAL ON

AND OFF, ERRATIC, WRONG FREQUENCY OR NOISY INPUTS WHILE AT ANY POSSIBLE UNPLUGGING OF POWER

OR SIGNAL, SETTINGS OF USER ACCESSIBLE CONTROLS. LIKEWISE, THE MONITOR SHOULD SURVIVE EXTENDED

PERIODS OF OPERATION WITH LINE VOLTAGE REDUCED BELOW THE SPECIFIED MINIMUM.

9. AN ISOLATION TRANSFORMER SHOULD BE USED WHEN PERFORMING ALIGNMENT AND TESTS. PORTIONS OF

THE POWER SUPPLY BOARD ARE HOT GROUND. THE REMAINING BOARDS ARE COLD GROUND.

10. DISCHARGE OF CRT ANODE SHOULD BE DONE ONLY TO CRT GROUND STRAP.

11. GEOMETRIC MEASUREMENT IS ASSUMED TO BE MAKING ALONG A STRAIGHT SURFACE WITH A FLAT RULE OR

TEMPLATE.

2. Specification

SPECIFIED.

B. INSTRUMENT ALIGNMENT

1. DEFLECTION PRESETS

CONTROL POTS VR101, VR401, VR403, FOCUS VR ARE SET AT MIDDLE POINT. SCREEN VR SET TO MIN.

2. POWER SUPPLY ALIGNMENT

2.1 INPUT VGA 640X480 SIGNAL CROSSHATCH PATTERN & BEAM CURRENT SET AT 0uA.

2.2 ADJUST VR101 UNTIL DC=105V0.3V AT TP201

2.3 ADJUST G2 UNTILL PICTURE VISIBLE.

2.4 ADJ VR403 UNTIL VOLTAGE AT TP208 = 63.0V 0.3V.

3. SIZE & GEOMETRY ADJUSTMENT

3.1 RASTER CENTERING

3.1.1 INPUT CROSSHATCH PATTERN AT 60KHZ 1024*768 MODE.

3.1.2 ADJUSTCONTRAST TO 10FL, ADJUST SCREEN JUST RASTER VISIBLE.

3.1.3 ADJUST VR401 TO CENTER RASTER ON SCREEN SUCH THAT THE HORIZONTAL DISTANCE

FORM THE MIDPOINT OF THE LEFT DISPLAY EDGE TO THE LEFT BEZEL EDGE IS WITHIN

2MM. OF THE DISTANCE FROM MIDPOINT OF THE RIGHT BEZEL EDGE.

BEZEL RASTER

I A-B I < 2mm

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3.2PICTURESIZE

INPUT MODE 1-12 SIGNAL ADJUST V-SIZE, H-SIZE TO ACHIEVE.

H-SIZE:310mm.+

2mm.

V-SIZE:230mm.+2mm.

230mm

310mm

BEZEL

PICTURE

3.3 PICTURE POSITION

INPUT MODE 1-12 ADJUST V-POSITION, H-POSITION SUCH THAT THE PICTURE IS CENTERED WITH THE

SCREEN

IA – B I< 2mm.

IC – D I< 2mm.

3.4 GEOMETRY ADJUSTMENT

3.4.1 INPUT MODE 1-12.

3.4.2 PINCUSHION AND BARREL DISORTION

BEZEL

PICTURE

AA' BB'

PINCUSION < 1mm (A,B,C,D)

BARREL < 1mm (A,B,C,D)

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3.4.3 TRAPEZOID AND PARALLEOGRAM DISTROTION TRAPEZOID / PARALLEOGRAM < 1.5mm.

3.4.4 ROTATE ADJUSTMENT

4. VIDEO ALIGNMENT / FUNCTION MEMORY RECALL

4.1 INPUT 1024x768 69KHZ FULL BLACK PATTERNS.

4.2 SET CONTRAST 0%, BRIGTHNESS 100%, RGB CUT OFF 0%, RGB DRIVER 50%, TURN THE G2 (SCREEN) KNOB

TO OBTAIN RASTER LIGHT O/P ABOUT 0.25FL.

4.3 BASE ON x, y READING, FIX THE STRONG GUN CUT OFF TO 130, THEN ADJUST THE OTHER TWO GUN AND

SCREEN KNOB TO MEET FOLLOWING CHROMATICALLY 9300OKÆx =0.283 + 0.003, y =0.297 + 0.003, Y = 0.5 +

0.2FL, STORE THE ADJUSTMENT OF 9300oK, THEN BASE ON x, y READING, FIX THE STRONG GUN AND G2,

ADJUST THE OTHER GUN TO MEET FOLLOWING CHROMATICALLY SPEC 6500OKÆx = 0.313+ 0.003, y = 0.329

+0.003, Y = DON’T CARE 5000OKÆx = 0.346+ 0.003, y = 0.359 + 0.003, Y = DON’T CARE

4.4 ADJUST BRIGHTNESS TO 50%, CONTRAST 100%

4.5 APPLY 70mm x 70mm GREEN WINDOW PATTERN, ADJUST G-DRIVER TO OBTAIN GREEN WINDOW PATTERN

LIGHT O/P ABOUT 30FL (9300OK)

APPLY WHITE WINDOW PATTERN, ADJUST R-DRIVER, B-DRIVER TO MEET FOLOWING CHROMATICALLY SPEC.

1.5mm

1.5mm1.5mm

230mm

310mm

h < 1mm

230mm

310mm

9300OKÆx = 0.283 + 0.003, y = 0.297 + 0.003, Y = 45+ 2FL. For TEXT/SPREADSHEET mode

9300OKÆx = 0.283 + 0.003, y = 0.297 + 0.003, Y = 85+ 3FL. For GRAPHIC/GAME mode

9300OKÆx = 0.283 + 0.003, y = 0.297 + 0.003, Y = 150+ 4FL. For VIDEO/MOVIE/DVD mode

4.6 APPLY 70mm x 70mm GREEN WINDOW PATTERN, ADJUST G-DRIVER TO OBTAIN GREEN WINDOW PATTERN

LIGHT O/P ABOUT 30FL (6500OK)

4.7 APPLY WHITE WINDOW PATTERN, ADJUST R-DRIVER, B-DRIVER TO MEET FOLLOWING CHROMATICALLY

SPEC.

6500OKÆx = 0.313 + 0.003, y = 0.329 + 0.003, Y = 45+ 2FL For TEXT/SPREADSHEET mode

6500OKÆx = 0.313 + 0.003, y = 0.329 + 0.003, Y = 85+ 3FL For GRAPHICS/GAME mode

6500OKÆx = 0.313 + 0.003, y = 0.329 + 0.003, Y = 130 + 4FL For VIDEO/MOVIE/DVD mode

4.8 APPLY 70mm x 70mm GREEN WINDOW PATTERN , ADJUST G-DRIVER TO OBTAIN GREEN WINDOW

PATTERN LIGHT O/P ABOUT 30FL (5000OK)

4.9 APPLY WHITE WINDOW PATTERN, ADJUST R-DRIVER,B-DRIVER TO MEET FOLLOWING

CHROMTICALLYSPEC

5000OKÆx = 0.346 + 0.003, y = 0.359 + 0.003, Y = 45+ 2FL For TEXT/SPREADSHEET mode

5000OKÆx = 0.346 + 0.003, y = 0.359 + 0.003, Y = 85+ 3FL For GRAPHICS/GAME mode

5000OKÆx = 0.346 + 0.003, y = 0.359 + 0.003, Y = 130+ 4FL For VIDEO/MOVIE/DVD mode

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4.10 APPLY FULL WHITE PATTERN

4.11 ADJUST OSD ABL TO OBTAIN LIGHT O/P = 30+1FL FOR ALL MODE

4.12 APPLY FULL WHITE PATTERN ADJUST CONTRAST FROM 30FL TO 10FL AND CHECK THE CHROMATICALLY

MEET FOLLOWING SPEC.

Ix (AT CONTRST, 30) –x (AT CONTRST, 25.75) I< 0.007.

Iy (AT CONTRST, 30) –y (AT CONTRST, 25.75) I< 0.003.

Ix (AT CONTRST, 10) –x (AT CONTRST, 25.75) I< 0.007.

Iy (AT CONTRST, 10) –y (AT CONTRST, 25.75) I< 0.006.

4.13 FUNCTION “ALL MODE RESET.

PUSH BUTTON “1” AND POWER SWITCH ON, THE PICTURE SHOULD RESTORE TO THAT OF FACTORY MODE.

4.14 USER COLOR MUST BE DEFAULTED AS 9300OK.

5. FOCUS ADJUSTMENT.

5.1 APPLY SIGNAL ALL “ME” PATTERN AT 1024*768 69K MODE.

5.2 SET BRIGHTNESS 50% CONTRAST 100%.

5.3 SET FOCUST CONTROL FOR BEST FOCUS.

C. INSTRUMENT TEST

6. TEST PRESETS.

6.1 BRIGHTNESS SET 50%, CONTRST SET 100%.

6.2 INPUT FULL WHITE PATTERN.

6.3 WARM-UP - ALLOW 30 MINUTES WARM-UP PRIOR TO TEST.

7. POWER SUPPLY TEST

7.1 INPUT CHARACTERISTICS

7.1.1 INPUT VOLTAGE RANGE: 90VAC TO 264 VAC, SINGLE PHASE.

7.1.2 INPUT FREQUENCY RANGE: 50HZ TO 60HZ.

7.1.3 MAX. INPUT AC CURRENT: 2A, LOW LINE INPUT, FULL LOAD.

7.1.4 INRUSH CURRENT: LESS THAN 30A FOR ½ CYCLE AT 110V, 50A FOR ½ CYCLE AT 240V, AT COLD

STRART.

7.1.5 EFFICIENCY: 70% MIN AT 110V LINE INPUT FULL LOAD.

7.2 OUTPUT CHARACTERISTICS:

7.2.1 STATIC OUTPUT CHARACTERISTICS:

MEASUREMENT

POINT OUTPUT

VOLTAGE

TP201 105 V + 3%

TP202 46.5 V + 5%

TP203 13.5 V + 5%

TP204 7.5 V + 5%

TP205 12 V + 5%

TP206 6.3 V + 5%

TP207 5.5 V + 5%

TP208 -13.5 V + 5%

7.3 DIELECTRIC WITHSTAND VOLTAGE:

7.3.1 PRIMARY TO SECONDARY: 2545VDC FOR 1 SEC.

7.3.2 PRIMARY TO SAFETY GROUND: 2545VDC FOR 1 SEC.

7.3.3 LEAKAGE CURRENT: 0.75mA. MAXIMUM AT 110/220VAC

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8. GEOMETRICAL TESTS

8.1 SIZE

8.1.1 APPLY FULL WHITE PATTERN AT ALL MODES.

8.1.2 PICTURE SIZE:

H-SIZE: 310mm + 3mm.

V-SIZE:230mm+

3mm.

8.1.3 BRIGHTNESS ATABILITY

H-SIZE: < 2mm.

V-SIZE: < 2mm.

NOTE: MIN. LIGHT OUTPUT TO MAX. LIGHT OUTPUT.

8.1.4 AC POWER VOLTAGE STABILITY.

H-SIZE: < 2mm

V-SIZE: < 2mm

8.1.5 THERMAL STABILITY (SIZE VARIATION)

H-SIZE: < 2mm.

V-SIZE: < 2mm.

NOTE: TEMP. 0oC~ 40o.

8.2 GEOMETRY

8.2.1 APPLY SIGNAL D AT EACH MODE.

8.2.2 PINCUSION AND BARREL DISTROTION

8.2.3 TRAPEZOID AND PARALLOGRAM DISTROTION

'BB'

PINCUSION < 2mm (A,B,C,D)

BARREL < 1.5mm (A,B,C,D)

310mm

230mm

2mm 2mm

2mm

PARALLELOGRAM <2.0mm (A,B,C,D)

TRAPEZOID <2.0mm (A,B,C,D)

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