ViewSonic VPW425, VLCDS22554-1W Service Manual

Service Manual

ViewSonic VPW425

Model No. VLCDS22554-1W

42” Plasma TV Monitor

ViewSonic



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

(VPW425-1_SM_598 - Rev. 1a – August 2002)

Copyright



Copyright
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.

2002 by ViewSonic Corporation. All rights reserved. No part of this publication may be

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

Revision History

Revision Date Description Of Changes Approval

1a 8/28/02 Initial Issue – DCN2564 T. Sears

ii VPW425-1 Service Manual

Service Manual

ViewSonic VPW425

Model No. VLCDS22554-1W

42” Plasma TV Monitor

ViewSonic



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

(VPW425-1_SM_598 - Rev. 1a – August 2002)

Copyright



Copyright
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.

2002 by ViewSonic Corporation. All rights reserved. No part of this publication may be

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

Revision History

Revision Date Description Of Changes Approval

1a 8/28/02 Initial Issue – DCN2564 T. Sears

ii VPW425-1 Service Manual

TABLE OF CONTENTS

1. WARNINGS & CAUTIONS ................................................................................................................. 1-1

2. SPECIFICATIONS ................................................................................................................................ 2-1

3. EXPLODED VIEW................................................................................................................................ 3-1

4. FACTORY & ELECTRONIC ADJUSTMENTS ................................................................................. 4-1

5. BLOCK DIAGRAM .............................................................................................................................. 5-1

6. TROUBLESHOOTING FLOW CHART .............................................................................................. 6-1

7. PC BOARD ASSEMBLY VIEWS ........................................................................................................ 7-1

8. MAJOR ELECTRONIC ASSEMBLY PARTS LIST............................................................................ 8-1

9. PACKING LIST..................................................................................................................................... 9-1

iii VPW425-1 Service Manual

IMPORTANT SAFETY PRECAUTIONS VER1.0

1-01

1. Before returning an instrument to the customer,

always make a safety check of the entire instrument,

including, but not limited to, the follo wing items.

a.

Be sure that no built-in protective devices are defective and/or have been defeated during servicing. (1) Protective

shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing
protective shields, including any removed for servicing convenience. (2) When reinstalling the chassis and/or
other assembly in the cabine t, be sure to put back in place all pro tective devices, including, but not limited to,
nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation
resistor/capacitor networks.

Do not operate this instrument or permit it to be operated without all protective

devices correctly installed and functioning.

b.

Be sure that there are no cabin et openings through which an adult or child m ight be able to i nsert their fingers

and contact a hazard ous volt age, S uch opening includ e, but are not limited to, (1) sp acing bet ween the pictur e
tube and the cabinet m ask, (2) excessively wide cabinet ventilation slots, and (3) an im properly fitted and/or
incorrectly secu red cabinet back cover.

c. Leakage Current Hot Check

—

——

—With the instrument completely reassembled, plug th e A C lin e c ord directly into a

120V AC outlet. (Do not use an isolation tr ans f orm er dur ing this t e st.) Us e a le akage current tester or a metering
system that complies with American National Standards Institutes (ANSI) C101.1 Leakage Current for Appliances
and Underwriters Labor atories (UL) 478. W ith the instrum ent AC switch firs t in the ON position a nd then in the
OFF position, measur e fr om a k nown earth gr ound (m etal wa terpipe, c onduit, etc.) to all ex posed metal par ts of
the instrument (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.),
especially any exposed metal parts that offer an electrical return path to the c h as s is. An y curr en t m eas ured must
not exceed 3.5 milliamp. Reverse the instrument power cord plug in the outlet and repeat test.

ANY
MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK
HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER.

2.

Read and comply with all caution and safety-relat ed notes on or inside the Monitor cabinet, on th e Projection
Monitor chassis, or on the picture tube.

3. Design Alteration Warning

—

——

—Do not alter or add to the mechanical or electrical design of this unit. Design

alterations and additio ns, including, bu t not limited to, circuit modific ations and the addi tion of the item s such as
auxiliary audio and/or video output connections m ight alter the safety characteristic s of this Projection Monitor
and create a hazard to the user. Any design alterations or add iti ons will void the manufacturer’s warra nty and wil l
make you, the service, responsible for personal injury or property damage resulting therefrom.

DEVICE
UNDER

TEST

A

LSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)

TEST ALL
EXPOSED METAL
SURFACES

LEAKAGE

CURRENT

TESTER

+-

EARTH

GROUND

3. WIRE CORD

A

C Leakage Test

(READING

SHOULD NOR

BE ABOVE

3.5mA)

IMPORTANT SAFETY PRECAUTIONS VER1.0

1-02

4. Hot Chassis Warning

————

a.

Some Monitor chassis are electrical ly connected dir ectly to one c onductor of the AC

power cord and may be safely serv iced without an is olation transf ormer only if the AC po wer plug is inserte d so
that the chassis is connected to the gr ound side of the AC power sourc e. To confirm that the AC power plug is
inserted correctly, with an AC voltmeter meas ure between the chassis and a known earth ground. If a voltage
reading in excess of 1.0V is obtained, rem ove and reinsert the AC power plug in opposite pol arity and again
measure the voltage potential between the chassis and a known earth ground. b. Some Monitor chassis normally
have 85V AC (RMS.), between chass is and earth gr ound regar dless of the AC plug polar ity. These chassis can
be safely serviced o nly with an isol ation trans form er insert ed in the p ower lin e bet ween the r eceiver and the AC
power source, for both personnel and test equipment protec tion.

c.

Some Projection Monitor chassis have a
secondary ground systems in addition to the main chassis ground. T his s ec ond ar y gr oun d system is not isol ated
from the AC power line. The two ground system ar e elec tric a ll y sep arated by insulating material that must not be
defeated or altered.

5.

Observe original le ad dress. Take extra care to assure correct l ead dress in the following are as:

a.

near sharp

edges, b. near thermally hot par ts—b e sure that le ads a nd com ponents do not t ouch ther m ally hot par ts,

c.

the

AC supply,

d.

high voltage,

e.

antenna wiring. Alwa ys inspect in all areas for pinched , out-of-place, or frayed
wiring. Do not change spacing between components, and betwe en components and the printed-c ircuit board.
Check AC power cord for damage.

6.

Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be replaced

with components, parts, or wireing that meet original specifications. Additionally, determine the cause of
overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard.

7. PRODUCT SAFETY NOTICE

—

——

—Many Monitor electrical and mechanical parts have special safety-related

characteristics some of which are often not evident from visual inspection, nor can the protection they give
necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have
special safety charac teris tics ar e ide ntifie d in th is s ervic e data by shad ing with a mark on schem atics and by
shading or a ＊ mark in the parts lis t. Use of a s ubstitute rep lacement part t hat does not hav e the sam e safety

characteristics as the recommended replacement part in this service data parts list might create shock, fire,
and/or other hazards.

SPECIFICATION VER1.0

2-1

1. SCOPE:
These specifications describe all the characteristics of the 42 inch color monitor .

2. ELECTRICAL REQUIREMENTS:

2.1. Display panel: Specification
a. Screen size Diagonal 42 inch

b. Aspect ratio 16:9 wide
c. Number of pixels 852(Horizontal, RGB Trio ) X 480(Vertical)pixels
d. Pixel Pitch 1.08mm X 1.08mm
e. Luminance 570cd/m

2

,at APL13%

f. Chromatically

x=0.270

±±±±

0.03, y=0.300

±±±±

0.03(color temperature mode 1 : ) at

center block white pattern 100% (mosaic).

2.2. Power Source:
a. Input voltage 100 ~ 240 Vac , 50 / 60 Hz

b. Input current 3.3A
c. Inrush current 60 A p-p/20ms Max.
d. Power consumption

380

±±±±

10% Watts ( at 110V ac/color bar pattern)

e. Stand-by & DPMS 5 Watts Max. (at 110Vac)

2.3. Input Signal:

2.3.1 Connector Type:

RCA Jack for audio, video Y/C

B/CR

and Y/PB/P

R

6 pin Din S-terminal
9 pin D-SUB
15 pin D-SUB
24 pin DVI

2.3.2 Video/S-Video Signal:
a. Type Analog

b. Polarity Positive
c. Amplitude
d. Frequency

Video 1Vp-p , (priority S-Video) Y=1Vp-p C=0.286Vp-p
H: 15.734KHz V: 60Hz(NTSC)
H: 15.625KHz V: 50Hz(PAL)

e. Input impedance 75 ohms

2.3.3 Y/CB/CR or Y/PB/PR Signal:
a. Type Analog

b. Polarity Positive
c. Amplitude AV: 1Vp-p (with sync)

S-Video: Y: 1Vp-p ,C: 0.286Vp-p

d. Frequency

Y/CB/C

R

Y/PB/PR: HDTV

H: 15.734KHz ,V: 60Hz (NTSC)
H: 15.625KHz ,V: 50Hz (PAL)

1. 31KHz/60Hz (480P)

2. 45KHz/60Hz (720P)

3. 33KHz/60Hz(1080I)

SPECIFICATION VER1.0

2-2

2.3.4 RGB Signal:

a. Type

TTL

b. Polarity

Positive or Negative

c. Amplitude RGB: 0.7Vp-p
d. Frequency H: support to 31K~91KHz

V: support to 50~85Hz

2.3.5 DVI Signal:
a. Type

b. Polarity
c. Frequency

Digital
Positive or Negative
H: support to 31K~63KHz
V: support to 50~85Hz

2.3.6 Audio Signal: Analog 500mV rms /more than 22Kohm

2.3.7 Pin Assignments For D-SUB Connector (In / Loop Out):

Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment

1 RED 6 RED GND 11 GND
2 GREEN 7 GREEN GND 12 SDA
3 BLUE 8 BLUE GND 13 H-SYNC
4GND 9NC 14V-SYNC
5 GND 10 GND 15 SCL

2.3.8 Pin Assignments For 24 Pin DVI Connector(Digital Only):

Pin Signal Assignment Pin Signal Assignment Pin Signal Assignment

1 TMDS Data 2- 9 TMDS Data 1- 17 TMDS Data 0­2 TMDS Data 2+ 10 TMDS Data 1+ 18 TMDS Data 0+
3 TMDS Data 2/4 Shield 11 TMDS Data 1/3 Shield 19 TMDS Data 0/5 Shield
4 TMDS Data 4- 12 TMDS Data 3- 20 TMDS Data 5­5 TMDS Data 4+ 13 TMDS Data 3+ 21 TMDS Data 5+
6 DDC Clock 14 +5V Power 22 TMDS Clock Shield
7 DDC Data 15 Ground (For +5V) 23 TMDS Clock +
8 No Connect 16 Hot Plug Detect 24 TMDS Clock -

SPECIFICATION VER1.0

2-3

2.3.9 RGB/DVI For VESA Standard:

Mode No Resolution

Refresh

Rate

Horizontal

Frequency

Vertical

Frequency

Vertical

Sync

Polarity

Horizontal

Sync

Polarity

Dot rate

(Hz) (K Hz) (Hz) (TTL) (TTL) (MHz)

1

640(VGA)

××××

480

60 31.5 59.94 - - 25.175

2

640(VGA)

××××

480

72 37.9 72.81 - - 31.500

3

640(VGA)

××××

480

75 37.5 75 - - 31.500

4

640(VGA)

××××

480

85 43.3 85.01 - - 36.000

5

800(SVGA)

××××

600

56 35.1 56.25 + + 36.000

6

800(SVGA)

××××

600

60 37.9 60.317 + + 40.000

7

800(SVGA)

××××

600

72 48.1 72.19 + + 50.000

8

800(SVGA)

××××

600

75 46.9 75 + + 49.500

9

800(SVGA)

××××

600

85 53.7 85.06 + + 56.250

10

1024(XGA)

××××

768

60 48.4 60.01 - - 65.000

11

1024(XGA)

××××

768

70 56.5 70.07 - - 75.000

12

1024(XGA)

××××

768

75 60.0 75.03 + + 78.750

13

1024(XGA)

××××

768

85 68.7 84.99 + + 94.500

14

1280(SXGA)

××××

1024

60 63.98 60.02 + + 108.00

15

◎◎◎◎

1280(SXGA)

××××

1024

75 79.98 75.03 + + 135.00

16

◎◎◎◎

1280(SXGA)

××××

1024

85 91.15 85.02 + + 157.50

18

640(VGA)

××××

350

70 31.50 70 - - 25.175

19

640(VGA)

××××

480

50 31.5 50 - - 25.175

20

◎◎◎◎

1280(HDTV)

××××

720P

60 45.15 60 - - 74.250

21

◎◎◎◎

1920(HDTV)

××××

1080I

60(I) 33.78 60 - - 74.250

22

720(DOS)

××××

400

70 31.46 70.08 + - 28.320

23

852(WGA)

××××

480

60 31.72 60.41 - - 34.00

RGB/DVI For Apple Standard.

Mode No Resolution

Refresh

Rate

Horizontal

Frequency

Vertical

Frequency

Vertical

Sync

Polarity

Horizontal

Sync

Polarity

Dot rate

(Hz) (K Hz) (Hz) (TTL) (TTL) (MHz)

24

640

××××

870

75 68.85 75.00 - - 57.283
25 832 x 624 75 49.73 74.55 - - 57.283
26 1152 x 870 75 68.68 75.06 - - 100.000

Attention

◎◎◎◎

: For DVI is not supported.

2.3.10 Y/PB/PR For Component:
Mode No Resolution Refresh Rate

1

640

××××

480P

60

2

1920

××××

1080I

60

3

1280

××××

720P

60

SPECIFICATION VER1.0

2-4

2.4. Display Performance Requirements:
The data of display performance are measured based on the following.
Conditions unless otherwise specified.

a. Ambient temperature

25

±±±±

5

℃℃℃℃

b. Warm up period 30 minutes Min.
c. Line input voltage : 100 Vac ~ 240 Vac (50 / 60 Hz)
d. Viewing distance Distance from screen is 81 cm
e. Display mode Test with window white pattern mode if not specified.
f. Brightness condition Press recall bottom to set default brightness

2.4.1 Maximum Resolution: Support to 1280 x 1024

2.4.2 Horizontal Size (Standard) 920

±±±±

8 mm (for mode 1

〜〜〜〜

26)

Vertical Size (Standard) 518

±±±±

8 mm (for mode 1

〜〜〜〜

26)

2.4.3 Horizontal Size (Max.) Mode 1~26

ÖÖÖÖ

full-scan

Vertical Size (Max.) Mode 1~26

ÖÖÖÖ

full-scan

2.4.4 Maximum Brightness Level: Timing Mode 1
a. 100% center block white

pattern(mosaic)

More than 30FL
(while pressing recall button to set default brightness)

b. raster background with contrast / brightness at Max. and black signal)

less than 0.4FL

2.5. Operation:

Main unit button

Main power switch (power ON /OFF)
Power ON/OFF
Input Mode (Video1 -> S-Video1 -> Video2 or S-Video2 ->

Y/P

B/PR

1 or Y/CB/CR 1 -> Y/PB/PR 1 or Y/CB/CR 1 -> RGB ->
DVI->Video1 run in circle)
Menu key -,+ Adjustment -,+

IR Remote Control Power on/off

Input Mode (same as Main unit button)
Volume -,+ Wide , Video/S video
input:4:3/16:9/ZOOM1/ZOOM2
Analog RGB input :W4:3/W16:9
Menu -,+ Adjustment -,+ RECALL
PIP ,POP ,SWAP ,MUTE

2.5.1 Adjustable Items:
AV/S-video input Brightness, Contrast, Color , Tint, Sharpness

Y/CB/CR Color Temperature
Analog RGB input

DVI input

Display position :
Brightness, Contrast, Vertical position, Vertical width,
Horizontal position, Horizontal width, Color Temperature
Clock phase, DPMS.

Brightness, Contrast, Vertical position, Vertical width,
Horizontal position, Horizontal width, Color Temperature,
DPMS

3. DIMENSIONS: Without/Stand With/Stand

SPECIFICATION VER1.0

2-5

Width

Height
Depth

1040mm

648 mm
95mm

1040mm
690mm
375 mm

3.1. Package Dimensions:
Width 1230 mm

Height 960 mm
Depth 470 mm

3.2. Weight:
Net weight 79.4lbs/36 Kgs (w/o stand) 83.8lbs/ 38Kgs (w/ stand)

Gross weight 115lbs/52 Kgs

4. ENVIRONMENT:

4.1. Operating:
Temperature

0~40

℃℃℃℃

(32~104

℉℉℉℉

)

Relative humidity 20~80%
Pressure 800~1114hpa

4.2. Non-Operating:
Temperature

-20~60

℃℃℃℃

Relative humidity 20~90%
Pressure 700~1114hpa
Vibration X/Y/Z, 0.5G/10~55Hz(sweep), 10 minutes

4.3. Acoustics:
(IHF A-weighted 1meter) 40dB Max.

5. SOUND:
a. Residual hum (at volume min)

500

μμμμ

W Max.

b. Practical max. Audio output (at 10% THD max.)

1.0vp-p 1K Hz input 5W +5W Max. /12 ohm
c. Sound distortion (at 250 mw 1K Hz)
d. Sound distortion (at

i.ovp-p 1kHz input volume max )

1% Max.

9% max

e. Audio output (input at 1.4V

P-P

)

≧≧≧≧

1.0 V

P-P

f. Max. hum (at volume max)

1000

μμμμ

W Max.

g. Sensitivity (at volume max. O/P 1W)

at 1KHz AV Input

150mV

±±±±

3dB

h. Audio Fidelity (1KHz 0dB,corrected for emphasis characteristics)

BBE ON 60Hz

6dB

±±±±

3dB

10KHz

8dB

±±±±

3dB

WOOFER & BBE OFF 100Hz

-6dB

±±±±

3dB

10KHz

-2dB

±±±±

3dB

6. RF

SPECIFICATION VER1.0

2-6

6.1 RF Sensitivity (Peak)
VHF CH 2 ~ CH 13 30dB Max.

UHF CH 14 ~ CH 69 30dB Max.
CATV CH A-5 ~ CH W+29 30dB Max.

6.2 AFT Pull-In Range
VHF CH 2 ~ CH 13

±±±±

0.6MHz Min.

UHF CH 14 ~ CH 69

±±±±

0.6MHz Min.

CATV CH A-5 ~ CH W+29

±±±±

0.6MHz Min.

6.3 Picture IF Rejection
VHF CH 2 ~ CH 13 50dB Min.

UHF CH 14 ~ CH 69 50dB Min.
CATV CH A-5 ~ CH W+29 50dB Min.

6.4 Picture Image Rejection
VHF CH 2 ~ CH 13 40dB Min.

UHF CH 14 ~ CH 69 35dB Min.
CATV CH A-5 ~ CH W+29 35dB Min.

6.5 AGC Characteristics
AGC Figure Of Merit 50dB Min.

RF signal range in which video at PDP drops 6 dB from output level obtained
with 100mV input.

6.6 RF AGC Cut In Level

55dB

±±±±

2dB

6.7 FM/AM Rejection (100mV at SIF input) 14dB min

6.8 Noise Limits Sensitivity VHF 45dB max

UHF 49dB max

7. RELIABILITY REQUIREMENT:
The MTBF needs 20000hrs under operation 25

±±±±

5

℃℃℃℃

(half luminosity, motion picture)

8. REGULATORY REQUIREMENTS:

8.1 Safety Requirement:
a. UL Safety of information technology equipment including

electrical business equipment

b. CSA Safety of information technology equipment including

electrical business equipment

c. TUV

8.2 Emission Requirement:
The unit shall meet the EMI limits in all screen modes. For EMI testing, the unit must be failed
with the screen pattern consisting of scrolling capital “H” characters also the brightness
contrast will be adjusted to max. Level.

a. FCC class A part 15

8.3 Transit test

SPECIFICATION VER1.0

2-7

a. Drop Test 200mm max.

b. Vibration Test

1. Forward and backward

2. Right and left

3. Up and down

30 minutes 1000 c.p.m
30 minutes 1000 c.p.m
30 minutes 1000 c.p.m

8.4 Power Management:

Mode H-sync V-sync Video Power dissipation
Normal Pulse Pulse Active Normal power
Stand-by No pulse No pulse No video Power off

Pulse No pulsePower saving

No pulse Pulse

Blanked Less than 5 watts

This Plasma display is Energy star compliant when used with a computer equipped with
DPMS.

Note: The power indicator LED color is green in normal state, yellow in stand-by

and power saving state.

9. VIDEO & AUDIO

9.1 Video Signal Output (impedance 75 ohm)
(input signal at 1.0 Vp-p

±±±±

0.2Vp-p)

1.0 Vp-p

±±±±

0.2Vp-p

SPECIFICATION VER1.0

2-8

APPENDIX A :
Preset Timing Ch art

Item Description:

A Total time
B Active display area including borders
C Active display area excluding borders
D Left/Top border
E Right/bottom border
F Blanking time
G Front porch
HSync-width

I Back porch

Mode No 123456789
Resolution
&
Refresh Rate

640
480

60

640
480

72

640
480

75

640
480

85

800
600

56

800
600

60

800
600

72

800
600

75

800
600

85 Hz
Pixel 25.175 31.5 31.5 36 36 40 50 49.5 56.25 MHz
Horizontal visible 640 640 640 640 800 800 800 800 800 Dots
Horizontal total 800 832 840 832 1024 1056 1040 1056 1048 Dots
Horizontal front porch 24 32 16 56 24 40 56 16 32 Dots
Horizontal sync 96 40 64 56 72 128 120 80 64 Dots
Horizontal back porch 40 120 120 80 128 88 64 160 152 Dots
Horiz blanking time 160 192 200 192 224 256 240 256 248 Dots
Vertical visible 480 480 480 480 600 600 600 600 600 Lines
Vertical total 525 520 500 509 625 628 666 625 631 Lines
Vertical front porch 181711113711Lines
Vertical sync 233324633Lines
Vertical back porch 25 20 16 25 22 23 23 21 27 Lines
Vertical blanking time 45 40 20 29 25 28 66 25 31 Lines
Horizontal frequency 31.469 37.9 37.5 43.3 35.1 37.9 48.1 46.9 53.7 KHz
Vertical frequency 59.94 72.81 75 85.01 56.25 60.317 72.19 75 85.06 Hz
Vertical sync polarity- - - -+++++TTL
Horiz sync polarity - - - -+++++TTL
Dot rate 25.175 31.5 31.5 36 36 40 50 49.5 56.25 MHz

A

B
C

E

D

H

F

I

G

(Video)

(Sync)