ViewSonic PJ452 - LCD XGA Projector-4.9LBS, PJ452, VS10948 Service Manual

LCD Projector

Service Manual

ViewSonic



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

ViewSonic PJ452

(PJ452_SM Rev. 1a DEC. 2005)

Model No. VS10948

2005 by ViewSonic Corporation. All rights reserved. No part of 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 C orporation.

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

View

Sonic 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.

Revision History

ECR Number

Description of Changes

EditorRevision SM Editing Date

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1a Initial Release

BonnieT.

12/9/05

TABLE OF CONTENTS

2. Specification

3. Names of each part

. Troubleshooting

8. Disassembly diagram

Replacement parts list

6. Service points

1. Precautions and Safety Notices

4. Adjustment

7. Wiring diagram

10. RS-232C commands

1 2

3 5

11 16

30 34 42

12. Connector connection diagram

11. Block diagrams

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13. Basic circuit diagram

1. Precautions and Safety Notices

1. When replacing the lamp, use care to avoid burns to your fingers. The lamp becomes very hot during operation.

2. Never touch the lamp with your fingers as body oil transferred to the lamp can damage the lam

p’s useful life.

3. Never drop the lamp or jar it in any manner. This m

ay cause the lamp to burst.

4. This projector is provided with a high voltage circu

it for the lamp. Do not touch any electric part or component after the projector has been turned on and is operating. Doing so could induce a severe shock causing injury or death.

5. Do not touch the exhaust fan, nor block its air flow, during operation, as the fan is hot.

6. The LCD module assembly can be easily damaged during service.

If replacing the LCD

Lens/Prism assembly, do not hold the FPC of the LCD module assembly.

7. Use only the cables which are included with the projector, or are specif

ied in this manual.

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Be sure to read this manual before servicing. To assure safety from ﬁ re, electric shock, injury, harmful

radiation and materials, various measures are provided in this Multimedia LCD Projector. Be sure to

read cautionary items described in the manual to maintain safety before servicing.

Caution

1. When replace the lamp, to avoid burns to your ﬁ ngers. The lamp becomes too hot.

2. Never touch the lamp bulb with a ﬁ nger or anything else. Never drop it or give it a shock. They may

cause bursting of the bulb.

3. This projector is provided with a high voltage circuit for the lamp. Do not touch the electric parts of

power unit (main), when turn on the projector.

4. Do not touch the exhaust fan, during operation.

5. The LCD module assembly is likely to be damaged. If replacing to the LCD/PRISM assembly, do not

hold the FPC of the LCD module assembly.

6. Use the cables which are included with the projector or speciﬁ ed.

Service Warning

Warning

The technical information and parts shown in this manual are not to be used for: the development, design, production, storage or use of nuclear, chemical, biological or missile weapons or other weapons of mass destruction; or military purposes; or purposes that endanger global safety and peace. Moreover, do not sell, give, or export these items, or grant permission for use to parties with such objectives. Forward all inquiries to the SUPPLIER.

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Features

• High Brightness

• Low Noise

• Compact Body

2. Specifications

Liquid clystal panel

Drive system TFT active matrix Panel size 1.5cm (0.6 type)

Number of pixels 1024 (H) x 768 (V) Lamp 165W UHB RGB signal input

RGB IN

Video : Analog 0.7Vp-p(75Ω termination) H/V. sync.: TTL level (positive/negative) Composite sync.: TTL level

VIDEO signal input

VIDEO IN 1.0Vp-p(75Ω termination)

S-VIDEO IN

Y signal : 1.0±0.1Vp-p, (75Ω termination) C signal : 0.286±0.1Vp-p(NTSC burst signal, 75Ω termination)

0.3±0.1Vp-p(PAL/SECAM burst signal, 75Ω termination) AUDIO IN 200mVrms, 47kΩ or more (max. 3.0Vp-p) Speaker output 1W(mono) Power supply AC100~120V/2.7A,AC220~240V/1.5A Power consumption 240W Dimensions 285 (W) x 73 (H) x 202 (D) mm (Not including protruding parts) Weight 2.2kg(4.85lbs)

Temperature range

Operation : 5~35°C Storage : -20~60°C

Accessories

Remote control x 1 RGB cable x 1 Power cords x 3 Batteries x 2

Filter cover for bottom up use x 1 User’s manuals x 1

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3. Names of each part

S-VIDEO

VIDEO

AUDIO

RGB

CONTROL

Lens

Lens cover

Filter cover (Air ﬁlter and intake vent are inside.)

Elevator button

Elevator foot

Remote sensor

Focus ring

Vent

AC inlet

Power switch

Elevator button

S-VIDEO port

VIDEO port

CONTROL port

Projector

Lamp cover (Lamp unit is inside.)

Elevator foot

Bottom side

Speaker

Front-Right side

Rear-Left side

Control buttons

Ports (See below.)

Vent

Ports

AUDIO port

Restart switch

RGB port

Kensington lock slot

NOTE (*) About Restart switch: This Projector is controlled by an internal

microprocessor. Under certain exceptional circumstances, the projector may not operate correctly and the microprocessor will need to be reset. In such a case, please push the Restart switch by using a cocktail stick or similar and before turning on again, make the projector cool down at least 10 minutes without

operating. Only push the Restart switch in these exceptional instances.

Part names

●

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STANDBY/ON

INPUT

LAMP

TEMP

POWER

LAMP indicator

TEMP indicator

POWER indicator

INPUT button

Cursor buttons ▲,▼,◄,►

STANDBY/ON button

Controls

VIDEO

RGB

FREEZE

OFF

MAGNIFY

ASPECT

STANDBY/ON

AUTO

BLANK

MUTE

VOLUME

KEYSTONE

POSITION

ESC

ENTER

RESET

ZOOM

emote contro

SEARCH button

RGB button

VIDEO button

ASPECT button

MAGNIFY ON button

OFF button

FREEZE button

POSITION button

ESC button

TANDBY/ON button

AUTO button

BLANK button

LUME button

MUTE button

KEYSTONE button

Zoom

+ button

- button

MENU button

enu cursor buttons

▲,▼,◄,►

ENTER button

RESET button

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4. Adjustment

4-1 Before adjusting

4-1-1 Selection of adjustment

When any parts in the table 4-1 are changed, choose the proper adjusting items with the chart.

Table 4-1: Relation between the replaced part and adjustment

Replaced

part

Adjustment

Convergence

(Chap.4-2)

E-POS

(Chap.4-3)

Ghost

(Chap.4-4)

Flicker

(Chap.4-5)

NRSH

(Chap.4-6)

White

balance

(Chap.4-7)

Color

uniformity

(Chap.4-8)

Dichroic

optics unit

LCD/LENS

prism

assembly

PWB

assembly

Main

Lamp

unit

assembly

: means need for adjustment. : means not need for djustment.

: means recommended.

4-1-2 Setting of condition before adjustment

1. Before starting adjustment, warm up projector

for about 10 minutes.

2. Set Zoom Wide to Max. And project an image

with more than 1m (40 inches) in diagonal size.

3. Normalizing the video adjustment

Press the [MENU] button to display the Easy

menu. If Advance menu comes up, move to the

Easy menu.

Select RESET in the Easy menu and press [

]

or [ENTER] button to open the RESET menu

window. Choose EXECUTE with [

] button.

Note that no signal input may not allow to reset

the adjustments.

4. Select PICTURE > GAMMA in the Advance

menu to set to DEFAULT1.

Note that PICTURE menu is not selectable with

no signal input displayed.

5. Select PICTURE > COLOR TEMP > CUSTOM

in the Advance menu, then press [

] or [ENTER]

button to display the equalizing window. Set all

the values of OFFSET and GAIN in the window

to zero.

Caution: Before this performance, make a note

of your customer’s adjustments, because the

data is overwritten.

6. Perform all adjustments from the FACTORY

MENU.

Perform the following operations to display the

FACTORY MENU.

< When you use the remote control… >

a. Press the [MENU] button of remote control to

display the Easy menu. (If the Advance menu

appears, move to the Easy menu from EASY

MENU.)

b. Select the [RESET] in the Easy menu, and

then press the [

] or [ENTER] button.

c. Next, press the [RESET] button one time.

And hold the [RESET] button for 3 seconds

or more (the FACTORY MENU will appear).

< When you use the keypad… >

a. Press the [ ]/[ ]/[ ]/[ ] button of the projec-

tor to display the Easy menu. (If the Advance

menu appears, move to the Easy menu from

EASY MENU.)

b. Select the [

RESET

] in the Easy menu, and

then press the [ ] button.

c. Next, press the [

] button one time. And

repress and hold the [ ] button together

with the [INPUT] button for 3 seconds or

more (the FACTORY MENU will appear).

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4-4 Ghost adjustment

Signals for internal adjustment

30%

112/255

30%

0/255

Adjustment procedure

1. Make this adjustment after completing the

adjustment in 4-3.

2. Choose Advance menu > OPTION > SERVICE

> GHOST > R,G and B, and set them to zero.

Use DAC-P - GHOST - R: in the FACTORY MENU

to adjust so that R color ghost is at a minimum.

(Set the adjustment value to default, and then

raise the value. When a ghost appears to the left

of a vertical line, reduce the value by 4 steps.)

4. In the same way, use DAC-P - GHOST-G: in

the FACTORY MENU to adjust so that G color

ghost is at a minimum.

5. In the same way, use DAC-P - GHOST-B: in

the FACTORY MENU to adjust so that B color

ghost is at a minimum.

4-2 Convergence adjustment

Signal pattern for internal adjustment

Adjustment procedure

1. Open FACTORY MENU and then select

OPTION > CNV-V. Use R and/or B so that

three colors of images can be converged at

center, top and bottom of the screen.

2. In the same way, select OPTION > CNV-H and

use R and/or B so that three colors of images

can be converged at center, left and right of the

screen.

4-3

E-POS adjustment

(vertical bars adjustment)

Signal pattern for internal adjustment

112/255

Adjustment procedure

1. Make this adjustment after completing the

adjustment 4-2 Convergence adjustment.

2. Choose Advance menu > OPTION > SERVICE

> GHOST > R,G and B, and set them to zero.

Open FACTORY MENU. Select DAC-P > E-POS

> R and use it so that vertical bars can disappear.

4. In the same way, select DAC-P > E-POS > G

and use it so that vertical bars can disappear.

5. In the same way, select DAC-P > E-POS > B

and use it so that vertical bars disappear.

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4-5 Flicker adjustment

(V.COM adjustment)

Signals for internal adjustment

Adjustment procedure

1. Make this adjustment after completing the adjustment in 4-4 Ghost adjustment.

Use DAC-P - V.COM - R: in the FACTORY MENU to adjust so that the flicker at the center of the screen is less than the flicker at the periphery. (When the flicker is about the same across the whole screen, adjust so that the flicker at the center of the screen is somewhat less than elsewhere.)

3. In the same way, use DAC-P - V.COM-G: in the FACTORY MENU to adjust the G color flicker.

4. In the same way, use DAC-P - V.COM-B: in the FACTORY MENU to adjust the B color flicker.

4-7

White balance adjustment

(visual inspection)

Preparations

1. Perform these adjustments after the NRSH adjustment described in Section 4-6.

2. Reset gamma correction before adjustment. Place the cursor on [GAMMA] in the FACTORY MENU, press the [RESET] key and select [DEFAULT].

Adjustment procedure

1. First, adjust the G color.

Select GAMMA, SUB-CNT, and G: in the FACTORY MENU. If the background is white solid, press the [ENTER] key on the Remote control transmitter to change to [G] monochrome in the 33-tone grayscale.

3. Adjust GAMMA, SUB-CNT, and G: in the FACTORY MENU so that brightness of 33 steps is best.

4. Don’t adjust GAMMA, SUB-BRT, and G: in the FACTORY MENU. Because we want to keep the best contrast ratio.

5. Then adjust colors R and B.

Select GAMMA, SUB-CNT, and G: in the FACTORY MENU. If the background is white solid, press the [ENTER] key on the Remote control trasmitter to change to [W] monochrome in the 33-tone grayscale.

7. Adjust GAMMA, SUB-BRT, R: and B: in the FACTORY MENU so that low-brigtness white balance is best.

8. Adjust GAMMA, SUB-CNT, R: and B: in the FACTORY MENU so that middle-brightness white balance is best.

9. Repeat steps 7 to 8 above, and adjust so that brightness white balance of 33 steps is best.

4-6

NRSH adjustment (vertical stripe adjustment)

Signals for internal adjustment

/255

112

/255

136

/255

160

/255

160

/255

136

/255

112

/25588/25564/255

Adjustment procedure

1. Make this adjustment after completing the adjustment in 4-5 Flicker adjustment.

2. Use DAC-P - NRSH - R: in the FACTORY MENU to adjust so that the vertical lines spaced every 6 dots are as inconspicuous as possible.

(Reduce the adjustment value when black

stripes appear in the 2nd or 3rd tone from the black side. Note that when the adjustment value is lowered, white stripes may appear in the 2nd or 3rd tone from the bright side. Should this happen, adjust so that the stripes are as inconspicuous as possible.)

In the same way, use DAC-P - NRSH - G: in the FACTORY MENU to adjust vertical stripes of G color.

In the same way, use DAC-P - NRSH - B: in the Adjustment menu to adjust vertical stripes of B color.

Press ENTER key

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VID-AD

MIN

MID-L

MID-H

MAX

DAC-P

GAMMA

C. UNIF.

No. 1 R 0

STRIPE

OPTION

C.UNIF

ON/OFF ON

OFF

G 0 B 0

Major adjustment lattice point No.

4-8 Color uniformity adjustment

Preparations

Perform these adjustments after the white balance

adjustment described in Section 4-7.

2. Make a color uniformity adjustment for the follow-

ing four tones.

MIN tone (approx. 4% input signal)

MID-L tone (approx. 14% input signal)

MID-H tone (approx. 25% input signal)

MAX tone (approx. 57% input signal)

3. Place the cursor on [C.UNIF.] in the FACTORY

MENU and press the [ ] key. This displays the

Adjust Tone menu at the bottom of the screen.

To choose the tone to be adjusted, press the [ ]

key and then use the [ ] or [ ] key.

Select the major adjustment lattice point No.

and color, and then adjust them.

4. The major adjustment lattice point numbers (a

total of 17 points) corresponds to the major

adjustment lattice point positions in the diagram

on the right. The color uniformity of the entire

screen can be adjusted by adjusting the white

balance for each of the points starting in order

from the low numbers.

5. Adjustment point No.1 should not be adjusted,

because it controls the brightness of the entire

screen.

To temporarily turn correction off, place the

cursor on [C.UNIF.] in the Adjust Tone menu and

press the [

] key. The ON/OFF menu appears.

Place the cursor on [ON] with the [ ] key and

press the [ ] key. To turn it on again, place the

cursor on [OFF] and press the [ ] key.

7. Although this adjustment can also be made

using internal signals, we will here use the

[ENTER] key on the Remote control transmitter

to select the following two signals.

Solid monochrome adjustment color (use G

color adjustment when a color differential

meter is used).

Solid white (use for adjustment other than

above).

8. Reset color-shading correction before adjust-

ment.

When 4 tones and all colors are to be reset,

place the cursor on [C.UNIF.] in the FACTORY

MENU, press the [RESET] key and select

[DEFAULT].

When only 1 tone is to be reset, place the

cursor on the tone to be reset, press the

[RESET] key and select [DEFAULT].

Single tone and monochrome resets cannot

be performed.

FACTORY MENU

Major adjustment lattice point position

14 12

15 17

6 4 8

2 1 3

7 5 9

10 11

V/6

H/6 H/3 H/3 H/6

V/3

V/6

Adjust tone menu

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Adjustment procedure 1 (When a color differential meter is used)

1. First adjust [MID-L] tone [G:].

2. Select adjustment point [No.2][G:].

When the background is not [G] monochrome,

press the [ENTER] key on the Remote control

transmitter to change to solid [G] monochrome.

3. Measure the illumination at adjustment points

No. 2, No.3, No.10 and No.11.

The values should be:

No.2 = Y2 [lx] No.10 = Y10 [lx]

No.3 = Y3 [lx] No.11 = Y11 [lx]

4. No.2 and No.3 adjustment point have the aver-

age of Y2 and Y3.

Y2 = ( Y2 + Y3 ) / 2 ± 2 [%]

Y3 = ( Y2 + Y3 ) / 2 ± 2 [%]

5. No.10 and No.11 adjustment point have the

average of Y10 and Y11.

Y10 = ( Y10 + Y11 ) / 2 ± 2 [%]

Y11 = ( Y10 + Y11 ) / 2 ± 2 [%]

6. Then adjust [MID-L] tone [R] and [B].

When the background is [G] monochrome,

press the [ENTER] key on the Remote control

transmitter to change to solid white.

7. Measure the color coordinates of adjustment

point [No.1] and make a note of them.

Assume that they are x = x1, y = y1.

Note: When the CL-100 color and color differ-

ence meter is used, the [ ∆ ](delta) mode

is convenient. When adjustment point

[No.1] color coordinate has been

selected, set the slide switch on the side

to [∆](delta) while holding down the [F]

button on the front panel. The measure-

ment shown after this displays the devia-

tion from measurement point 1.

8. Measure the color coordinates of measurement

point [No.2] and adjust [No.2][R:] and [B:] so

that the coordinates are as follows.

x = x1 ± 0.005 , y = y1 ± 0.010

9. Similarly, measure adjustment points [No.3] to

[No.17] and adjust their color coordinates start-

ing in order from the small number points.

This completes adjustments required for [MIN].

Note: Since excessive correction may lead to a

correction data overview during internal

calculations, use the following values for

reference.

[No.2] to [No.5] ± 40 or less

[No.6] to [No.9] ± 50 or less

[No.10] to [No.13] ± 70 or less

[No.14] to [No.17] ± 120 or less

10. Then adjust [MIN] tone [G] so that the adjust-

ment data set two times as much as [MID-L]

tone [G].

This completes [G] color adjustments.

11. Then adjust [MIN] tone [R] and [B].

Select [No.2] [B:] and press the [ENTER] key

on the Remote control transmitter to change to

solid white.

12. Measure the color coordinates of adjustment

point [No.1] and make a note of them.

Assume that they are x = x1, y = y1.

13. Now measure the color coordinates of mea-

surement point [No.2] and adjust [No.2][R:] and

[B:] so that the coordinates are as follows.

x = x1 ± 0.005 , y = y1 ± 0.010 (Target)

x = x1 ± 0.020 , y = y1 ± 0.040

14. Similarly, measure adjustment points [No.3] to

[No.17] and adjust their color coordinates start-

ing in order from the small number points.

This completes [MIN] tone adjustments.

15. Now make similar adjustments for [MID-H] tone.

(Adjust [MID-H] tone [G] so that the adjustment

data set half as many as [MID-L] tone [G].)

16. Now make similar adjustments for [MAX] tone.

(Adjust [MAX] tone [G] so that the adjustment

data set half as many as [MID-L] tone [G].)

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Adjustment procedure 2 (visual inspection)

1. First adjust [MIN] tone [G:].

2. Select [No.2] [G:].

If the background is [G] monochrome, press the

[ENTER] key on the Remote control transmitter

to change to solid white.

3. View measurement point [No.2] and [No.3].

Lower the [G] color intensity only of the color

point whose [G] color is more intense than

measurement point [No.1].

4. View measurement point [No.10] and [No.11].

Lower the [G] color intensity only of the color

point whose [G] color is more intense than

measurement point [No.1], and raise the inten-

sity of the point whose color intensity is lower

than measurement point [No.1].

5. Now adjust the [MIN] tone for colors [R] and [B].

6. View measurement points [No.2], [No.3],

[No.10] and [No.11]. Adjust the [R] and [B] of

each measurement point so that they have the

same color as measurement point [No.1].

Adjustment technique:

First, adjust [B:] of the point whose color is to

be adjusted so that it approximates that of

[No.1]. If [R:] is low at this time, the image will

have cyan cast, in which case [R:] is increased.

On the other hand, if [R:] is excessive, the

image will have a magenta cast, in which case

[R:] is decreased.

Overall, a cyan cast makes it easy to see color

shading.

7. Next, view measurement points [No.4], [No.5],

[No.12], [No.13] and make similar adjustments.

Then adjust measurement points [No.6], [No.7],

[No.8], [No.9], [No.14], [No.15], [No.16] and [No.17].

This completes the [MIN] tone adjustments.

9. Make similar another three tones as described

in steps 1 to 8 above.

3 11

No. 2 deviation range No. 10 deviation range No. 3 deviation range No. 11 deviation range

No. 4 deviation range No. 12 deviation range No. 5 deviation range No. 13 deviation range

No. 6 deviation range No. 7 deviation range No. 8 deviation range No. 9 deviation range

No. 14 deviation range No. 15 deviation range No. 16 deviation range No. 17 deviation range

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5. Troubleshooting

Check points

PWB Assembly SW

E800

E803

ESPL

E801

E804

E301

E802

D303

(LAMP)

D302

(TEMP)

D301

(Power)

P501

P701

P601

E806

E302

E807

E805

PWB assembly MAIN

PWB assembly REMOTE

*Top view of the projector after the silver gilding on the lamp house detached.

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Power can not be turned on

Are

voltage input at

pins (1)(3)(5)(7) of E800

on the PWB assembly

Main at standby

mode?

(1): +0V (3): +17V (5): +6.6V (7): +4.1V

Power unit (circuit)

Fuse on the

Power unit (circuit)

YES

Disconnect

TSW form Power unit

(circuit). And check

TSW short or

open?

PWB assembly Main

Short

TSW

Open

What is the state of

TEMP indicator D302?

Not light

Blinks

Jump to * on the page 13

What is the state of

LAMP indicator D303?

Not light

Blinks

Short (0 )

Unplug

power cord and

disconnect cable CNLC,

then measure resistance

between pins (1)

and (2) of

CNLC.

Open

PWB assembly Limit SW

PWB assembly Main

Is the LAMP DOOR

set?

Set the LAMP DOOR

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Lamp does not light

What is the state of LAMP indicator D303 during operation?

Power unit (ballast)

Lamp

PWB assembly MAIN

Power unit (ballast)

Light

PWB assembly MAIN

YES

Not light

YES

Change the lamp.

Does lamp light?

Power unit (circuit)

Not light

Install the Lamp

Light NG

Is the LAMP

installation correct?

YES

What is the state

of TEMP indicator D302?

Not light

Blinks

DC FAN

(Exhaust)

H (3.3V)

"L" = 0V

L (0V)

Is the

voltage at the

(1) of E804 on the PWB

assembly MAIN fixed to "L"

during warming-up?

"L" = 0V

Measure

voltage at pin(1)

of E801 on PWB

assembly MAIN.

DC FAN

(B Panel)

Measure

voltage at pin(1)

of E807 on PWB

assembly MAIN.

Is the voltage

at the (3) of E804 on

the PWB assembly MAIN

set to "L" during

warming-up?

DC FAN

(Sub)

YES

(L=0V)

Is the

voltage at the pin

(1) of E806 on the PWB

assembly MAIN set

to “L” ?

H (3.3V)

DC FAN

(R/G Panel)

L (0V)

Measure

voltage at pin(1)

of E802 on PWB

assembly MAIN.

PWB assembly MAIN

H (3.3V)

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Picture is not displayed only

when the RGB signal is input

PWB assembly M

AIN

LCD PRISM

assembly

Check at operating mode

Power unit

(circuit)

YES

Are

voltage input

at pins(1)(3)(5)(7) of

E800 on the PWB

assembly

MAIN?

(1):+13.2V (3):+17V (5):+6.6V (7):+4.1V

Power unit (circuit)

YES

Are

voltage input at

pins(1)(3)(5)(7) of E800

on the PWB assembly

MAIN?

(1): +13.2V (3): +17V (5): +6.6V (7): +4.1V

PWB assembly MAIN

LCD PRISM

assembly

Check at operating mode

Picture is not displayed only when the VIDEO, S-VIDEO signal is input

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The check after parts change

1. PC power supply OFF

2. Connection of cable

3. Projector starting

4. PC starting *When not operating : PC set up change of cable.

Can not control to RS-232C

PWB assembly MAIN

YES

Use cross cable

Check the

RS-232C cable.

Are pin No. 2 and 3

crossed?

YES

Power unit (circuit)

Check the

power supply voltage

of E800 the voltage

correct?

(1): +13.2V (3): +17V (5): +6.6V (7): +4.1V

Speaker

No sound

YES

Power unit (CIRCUIT)

Are

voltage input at pin

(1)(3)(5)(7) of the E800 on

the PWB assembly

MAIN?

about 8Ω

0Ω or infinity

PWB assembly MAIN

Turn off

the projector and

disconnect the Speaker

cable from ESPL.Measure

the resistance of

the Speaker

(1): +13.2V (3): +17V (5): +6.6V (7): +4.1V

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6. Service points

6-1 Lead free solder [CAUTION]

This product uses lead free solder (unleaded) to help preserve the environment. Please read these

instructions before attempting any soldering work.

Lead free solder indicator

Printed circuit boards using lead free solder are engraved with an "F" or "LF".

Properties of lead free solder

The melting point of lead free solder is 40-50˚C higher than leaded solder.

Servicing solder

Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended.

Although servicing with leaded solder is possible, there are a few precautions that have to be taken. (Not

taking these precautions may cause the solder to not harden properly, and lead to consequent malfunctions.)

Precautions when using leaded solder

Remove all lead free solder from soldered joints when replacing components.

If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the

lead free solder has been completely melted (do not apply the soldering iron without solder).

Servicing soldering iron

A soldering iron with a temperature setting capability (temperature control function) is recommended.

The melting point of lead free solder is higher than leaded solder. Use a soldering iron that maintains a high

stable temperature (large heat capacity), and that allows temperature adjustment according to the part being

serviced, to avoid poor servicing performance.

Recommended soldering iron:

Soldering iron with temperature control function (temperature range: 320-450˚C)

Recommended temperature range per part:

Part Soldering iron temperature

Mounting (chips) on mounted PCB 320˚C±30˚C

Mounting (chips) on empty PCB 380˚C±30˚C

Chassis, metallic shield, etc. 420˚C±30˚C

(1) PWB assembly MAIN

(2) PWB assembly REMC

(3) PWB assembly SW

(4) POWER UNIT (BALLAST)

(5) POWER UNIT (CIRCUIT)

The PWB assembly which has used lead free solder

CAUTION

Always wear safety glasses to prevent fumes or molten solder from getting into the eyes. Lead free solder

can splatter at high temperatures (600˚C).

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6-2 Replacing The LCD/PRISM assembly

You should not replace separately the parts of the LCD/PRISM assembly. In case of a failure in any parts of

LCD/PRISM assembly, replace the whole LCD/PRISM assembly.

Do not disassemble the unit becaouse replacement of separate parts is not possible.

LCD/PRISM ASSY

6-3 Cleaning up dust from panels and optical filters

1. Preparation

Please prepare cleaning tools and materials as follows. And prepare relatively clean room not to work in

additional dust, while removing operation.

(1) Swab for cleaning "Cotton stick L147"

(2) Air duster (Dust blower, spray can)

(3) Vacuum cleaner

2. Disassemble and open the maintenance hole.

(1) Turn off the projector, and unplug the power cord.

(2) Remove the top cover, according to the notice 1 of chapter 8.

(3) Remove the PWB assembly MAIN, according to the notice-2 of the chapter 8.

(4) Remove the Panel Cover.

(5) Attach the PWB assembly MAIN in original place, and connect cables indicated above. Note that flexi-

ble cables of LCD panels should come to the upper portion of PWB assembly MAIN, but don’t connect them to the connectors. Make sure that flexible cables’ terminals don’t touch to any other parts during maintenance, especially when the projector is turned on.

WARNING

Wear sunglasses to protect your eyes when you maintain the projector with its lamp on.

Flexible cables of LCD panels

Remove Panel Cover

PWB assembly MAIN

Connect cables

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3. Maintenance point

Each color part has same

construction.

By using swab and air duster,

you can easily remove dust

from panel and optical filter.

4. Cleaning the panels and optical filters

(1) Turn on the set and lit on the lamp.

(2) By using swab and air duster, remove the dust. Focusing dust makes you check the dust on screen.

• While removing the dust, separated dust

will be blown off by air cooling system.

• Please pay attention not to damage panel

and optical filter.

5. Re-assembly

(1) Turn off the set and remove the PWB assembly MAIN.

(2) Set the

Panel cover

(3) Re-assemble the PWB assembly MAIN.

(4) Re-assemble the set.

(5)

While re-assembling, please clean the Panel cover and intake filter and filter cover by using vacuum cleaner.

Swab

Panel

Optical filter

Holder

Air

Actual formation

Swab

Panel

Holder

Optical filter

Separatied formation

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+ 49 hidden pages

ViewSonic PJ452 - LCD XGA Projector-4.9LBS, PJ452, VS10948 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual