ViewSonic A90f+-1 VCDTS23307-2R User manual

Service Manual

ViewSonic A90f+-1

Model No. VCDTS23307-2R

19” Digital Controlled Color Monitor

(A90f+-1_SM_602-Rev. 1.0-October 2002)

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

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 10/9/02 Initial Release DCN-2658 K.Yang

ViewSonic Corporation iConfidential – Do Not Copy A90f+-1

1b 11/05/02 Revise DCN-2658 C.Shen

TABLE OF CONTENTS

1. Precautions and notices ......................................................1

2. Specification.......................................................................3

3. Control Location and Functions ........................................5

4. Disassembly instructions ...................................................9

5. General Connections & applications ...............................11

6. Electronic Circuit Description .........................................13

7. Adjustment ......................................................................19

8. Troubleshooting Flow Chart.............................................28

9. Recommended Spare Parts List........................................35

12. PCB Layout.....................................................................54

13.Schematic Diagram.........................................................57

14.Exploded Diagram.......................................................... 64

11.Block Diagram................................................................53

ViewSonic Corporation iiConfidential – Do Not Copy A90f+-1

10. Electrical Parts List.........................................................37

1. Precautions and Notices

1.1 SAFETY PRECAUTIONS

1) Observe all cautions and safety related notes located inside the display cabinet and on the display

chassis.

2)Operation of this display outside the cabinet or with the cover removed, may involves a shock harzard

from the display power supplies. Work on the display should not be attempted by anyone who is not

thoroughly familiar with precautions necessary when working on high voltage equipement.

3)Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles are worn.

People not so equiped should be kept away while handling picture tube. Keep picture tube away from

body while handling.

1.2 Observe all cautionary and safety related notes located on the chassis, cabinet and display tube.

1.3 Operation of the monitor with the back cover removed presents a potential shock hazard. Only

personnel familiar with the precautions necessary for safe working on high voltage equipment should

attempt to carry out servicing.

1.4 Always wear shatter proof goggles when removing, installing or generally handing the picture tube.

People not so equipped should be kept at a safe distance when any such handing is being undertaken.

Do not handle the picture tube by the neck of deflection coil. Do not carry the picture tube resting against

the body.

1.5 The picture tube is designed and constructed to limit X-Radiation to a safe level during normal operation.

To maintain the required level of protection and safe operation, replacement tubes must be correctly

adjusted and any protective circuits must not defeated.

1.6 IMPORTANT-Safety Tests

After servicing, and before returning the monitor to the user, a thorough safety test must be carried out

to ensure there is no potential shock hazard to any operator(s) using the monitor.

All the following test must be performed. A monitor failing any of these tests should be rejected and have

the problem rectified.

1.7 A.C. Leakage Test

Remove the power sourse. Connent the monitor to the circuit as in figure 1 below. Switch the monitor

on/off switch to on. A reading of less than 3.5mA should obtained (ref. EN60950).

Equipment safety

Earth terminal

Equipment

Under test

Measuring instrument

Isolating

transformer

Fig. 1 Measurement of AC Leakage Current

ViewSonic Corporation 1Confidential – Do Not Copy A90f+-1

1.8 Voltage Breakdown Test

Connent the live pin and neutral pin together. Switch the monitor on/off switch to on. Apply 1500VAC

RMS or 2250VDC, 50Hz for one minute between this connection point(live and neutral pin short) and

earth. Ensure no voltage breakdown occurs.

1.9 Earth Resistance/Continuity Test

Measure the resistance between the signal cable metal shell and the earth pin in the A.C. socket. At a

current of 25 amperes, the resistance should be less than 500mohm.

NOTE: A portable appliance tester (PAT) is a suitable instrument to use for the above safety tests.

1.10 H.V. Over Voltage Protection (Required for X-Radiation Safety)

Adjust R176 slowly anti-clockwise until the over voltage protection circuit is activated, and the high

voltage must be less than 33KV just before the activation. After test, R176 should be adjusted back to

normal(=25.9KV)

CAPACITOR:

C850 400V 4700PFM CAPACITOR.CERAMIC 5230105501

C851 400V 4700PFM CAPACITOR.CERAMIC 5230105501

C135 250V 33UFM CAPACITOR.ELECTROLYTIC 5214433012

C139 100V 330UFM CAPACITOR.ELECTROLYTIC 5214019612

RESISTOR

R827 1/4w 2K ohm RESISTOR.VR 5162161220

SEMICONDUCTORS

I803 UC3842N IC LINEAR 6644063111

I301 TDA9116 SDTP-32 IC.LINEAR A.S.D.C. 6644076308

I310 TDA8172 7P IC.LINEAR 6644076000

I101 UC3842N IC.LINEAR 6644063111

IA01 NT68F62U SDIP-42 IC.LSI MCU 6647008204

Q121 2SK2843 TR FET MOS 6626003202

Q433 BU4525AX TR NPN 6621002801

Q801 2SK2648 TR FET MOS. 6626003208

D827 HZ5C1 DIODE ZENER 6615007834

OTHERS

SR801 CSA-SS-212DM5 RELAY 5054613402

F801 250V/3.15A FUSE 5054431539

T801 TPW-697 POWER TRANSFORMER 5061369700

T101 (RA) TFB-280T TRAQNS.FLYBACK COLOR 5062628031

T101 (RB) TFB-280L TRAQNS.FLYBACK COLOR 5062628032

V901 (RA) M46QCK761X123 (TCO

MDT)

CCRT/DY 5051286346

ViewSonic Corporation 2Confidential – Do Not Copy A90f+-1

2. Specifications

Size and deflection angle 19 inch 90 degree

Screen type Pure, Flat, High Brightness

Horizontal pitch / Dot pitch 0.22mm / 0.25mm

Surface treatment Anti-static AR coating

CDT

Transmission rate 52.6%

Horizontal Frequency 30kHz to 86kHz

Scanning

Freq. Vertical Frequency 50Hz to 150Hz

Video amplifier Applicable pixel rate 175MHz

Resolution Maximum 1600 x 1200

Modes Factory preset/User modes 13 / 10

AC input range 100 to 240 Vac

Max. power consumption 110W

Normal <110 W

Power

Power Management Off <3 W

Power Switch On/off with Led indicator

Up/Down adjustment Key

2 key pads for adjust

Up / down keys are direct access for Contrast

And Brightness adjustment

“1” “ 2” Key As a select key/ go to next sub menu

User controls

“UltraBrite Mode “Key As a select key/ go to High Bright Display mode

Signal

connections

Standard Model 1.8 m signal cable with 15Pin D shell miniature

male connector.

Rear

connection

Power input AC socket with 1.8 meter cable

Safety CB,

Emissions EN50081-1

Immunity EN50082-1

ISO9241Paart3 &ISO9241Part8

Ergonomic

VLMF MPRII

European

EPA Energy Star

Safety UL1950, Cul950 or CSA 22.2

Emissions FCC class B

USA

X-ray DHHS

Regulatory Filing VCDTS23307-XYZ

Agency

Approvals

Plug and Play DDC 1/2 B Version 2

Operating Temperature

Storage Temperature

0qC to 40qC

–40qC to +60qC

Operating Humidity 10% to 90%

Environmental

Conditions

Storage Humidity 10% to 95 %

Dimensions W x H x D 575 mm x 600mm x 630mm

Weight Kg 25.5Kg (Gross)

ViewSonic Corporation 3Confidential – Do Not Copy A90f+-1

Noted that A90f + belong to MPR II models.

Alignment default conditions:

3.1 Room luminance: 225 LUX.

3.2 Warm up: Mis-convergence: 30 minutes (Full white display).

Other spec.: 20 minutes.

Display usable: 15 sec.

3.3 CDT direction : East

3.4 Pattern generator : CHROMA 2250 or equivalent.; (Video O/P: 0.7 Vpp).

3.5 Earth Magnetic field:

Northern Hemisphere: Bh : 0.25 +/- 0.01 GAUSS ; Bv : 0.45+/- 0.01 GAUSS –U03 model.

Southern Hemisphere: Bh : 0 +/- 0.01 GAUSS , Bv : -0.52 +/-0.01 GAUSS.

3.6 AC Power input: 110V AC, 50/60 Hz ;230V AC ,50 /60Hz.

3.7 Ambient temperature: 20 ²5 ʑ.

3.8. Preset Mode Timing: Total 13 Pre-set Modes + 1 mode (mode 5 for self test setup)

MODE RESOLUTIO

H X V

NO.

H.FREQ

(kHz)

V.FREQ(

Hz)

POLART

HORIZ.

TOTAL

USEC

DISPLAY

USEC

H.BACK

PORCH

USEC

H.SYNC

WIDTH

USEC

VERT.

TOTAL:

MSEC

V.DIS-

-PLAY

MSEC

V.BACK

PORCH

MSEC

V.SYNC

WIDTH

MSEC

VIDEO

RATE

MHz

VGA 640 X 480

31.469

59.94



31.778 25.422 1.907 3.813 16.683 15.253 1.049 0.064 25.175

VGA 640 X 400

31.469

70.078

31.779 25.422 1.907 3.813 14.269 12.712 1.112 0.064 25.175

MAC 640X480

35.0

66.667

Composit

Negative

28.571 21.164 3.175 2.116 15 13.714 1.114 0.086 30.24

640X480

37.5



26.667 20.317 3.81 2.032 13.333 12.8 0.427 0.080 31.5

VESA

85Hz

640 X 480

5 (for

auto-size

reference)

43.269

85.008



23.111 17.778 2.222 1.556 11.764 11.093 0.578 0.069 36

VESA

75Hz

800 X 600

46.875

21.333 16.162 3.232 1.616 13.333 12.8 0.448 0.064 49.5

MAC 832X 624

49.725

74.5



20.111 14.524 3.910 1.117 13.414 12.549 0.784 0.06 57.28

800 X 600

53.674

85.061

18.631 14.222 2.702 1.138 11.756 11.179 0.503 0.056 56.25

VESA

75Hz

1024 X 768

60.023

75.029



16.660 13.003 2.235 1.219 13.328 12.795 0.466 0.050 78.75

1024 X 768

60.241

74.927



16.6

12.8 2.2 1.2 13.346 12.749 0.498 0.05 80

VESA

85Hz

1024 X 768

68.677

84.997



14.561 10.836 2.201 1.016 11.765 11.183 0.524 0.044 94.5

1600 X 1200

75.0



13.333 9.877 1.877 1.185 16.667 16 0.613 0.04 162

VESA

75Hz

1280 X 1024

79.976

75.025



12.504 9.481 1.837 1.067 13.329 12.804 0.475 0.038 135

VESA 1024 X 768

48.363

60.004



20.677 15.754 2.462 2.092 16.666 15.880 0.600 0.124 65

ViewSonic Corporation 4Confidential – Do Not Copy A90f+-1

3. Control Location and Functions

Power switc

Led indicator

“2” key

Down

“1” ke

Power switch

Auto Sizing

Front view

Rear view

UltraBrite

Mode

UltraBrite Mode

15 pin D Sub

AC input

ViewSonic Corporation 5Confidential – Do Not Copy A90f+-1

4.1. Function Key adjustment Description:

(a). Power switch: This is a “software “Key, Turns the display on and off. The power indicator will

light “Green”, when the display is on.

“1” key: Turn (on /off) OSD menu.

Key: Down side to select item / decrease value

Key: Up side to select item / increase value

: Keys can directly access Contrast / Brightness adjustment

(b). “2“key: a select key or go to next sub menu.

(c). Pressing “2 & power” key at same time to switch monitor on and then pressing “1” Key will

enter factory optimized OSD Menu (see Fig. 0)

(d). Selected icon and then pressing “2” key will demagnetize CDT.

(e). High Brightness Key ( UltraBrite Mode ): this key will be effective only after switching on

monitor

(not in preset state), Pressing this key will switch normal brightness to high brightness.

The next pressing will return to normal brightness.

In preset menu, Sup93 / Sup65 / Sup50 represent the high brightness of 9300K / 6500K /

5000K.

(f). Autosizing Key: pressing this key will automatically adjust the display to a proper setting.

Note this function only work precisely after all preset modes being set up.

For Autosizing reference, all maually set up preset modes must be saved by pressing “head

“ Icon.

Fig. 0 Factory OSD Menu

4.2 User OSD menu descriptions

Press “1” key to display a basic main menu (1) shown as below.

FIGURE 1( USER MODE OSD MENU 1)

ViewSonic Corporation 6Confidential – Do Not Copy A90f+-1

Using and keys to move a cyan window bar to get your desired items. If it is selected,

Then pressing “2” key to display

Sub menu as below to start adjustment.

Using and to decrease / increase value on selected item. Noted that the menu can do two

items adjust

by pressing “2” key, it will change to another one in toggle.

In main menu (1), move the cyan window bar up to the first item or down to the last item, then the

next bar moving will enter main menu (2) as below for other adjustment.

FIGURE 2 ( USER MODE OSD MENU 2)

In main menu 2, if “ VIEWMATCH COLOR” is selected, then pressing “2” key will display

color sub menu as the following

The three default color modes (9300k, 6500k, 5000k) are factory preset, User can select these

default colors but can’t adjust and save.

If “USER COLOR” is selected, then pressing “2” key will display next sub menu as below to start

color adjustment.

ViewSonic Corporation 7Confidential – Do Not Copy A90f+-1

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