Sony V-2, CPD-220AS Service Manual

CPD-220AS

SERVICE MANUAL

SPECIFICATIONS

Picture tube

CPD-220AS: 0.25 mm aperture grille pitch, 17 inches measured diagonally (16.0” viewable), 90-degree deflection, AR coating

Viewable image size

CPD-220AS: Approx. 327 × 241 mm (w/h) (12 7/8 × 9 1/2 inches) 16.0” viewing image

Max resolution Horizontal: Max. 1280 dots

Vertical: Max. 1024 lines

VESA standards 640 × 480 at 85 Hz

800 × 600 at 85 Hz 1024 × 768 at 85 Hz 1280 × 1024 at 60 Hz

Deflection frequency

Horizontal: 30 to 70 kHz Vertical: 50 to 120 Hz

Speaker Left, right: 3.5 W × 2, Sub-woofer:

10 W 50 to 20 kHz

Microphones Uni-direction, electret condenser

microphone

Microphones output

Miniplug

Audio input Stereo miniplug, input impedance

47 kΩ, input level 0.7 Vrms typical

AEP Model

Chassis No. SCC-L02C-A

V-2

Headphones output

Stereo minijack, 4 mW + 4 mW at 16 Ω

Microphones input

Minijack, plug-in-power

USB pass-through

Upsteam × 1, downstream × 1

Controls Contrast/Audio level/Picture

enhancement/Brightness/Bass Boost/(Audio level)/H.Size/V.Size/ Pincusion/Color tempeature/Audio muting

AC input voltage/current

100 to 240 V, 50 – 60 Hz, 1.5 – 0.5 A

Dimensions

CPD-220AS: Approx. 481.5 × 483 ×

427.5 mm (w/h/d) (19 × 19 1/8 × 16 7/8 inches)

Mass CPD-220AS: Approx. 22 kg

(48 lb 1 oz)

Design and specifications are subject to change without notice.

CHASSIS

MICROFILM

TRINITRON® MULTIMEDIA COMPUTER DISPLAY

CPD-220AS

DIAGNOSIS

Scan/S cap Failure Blink Amber

ABL Failure Blink Amber

Audio Failure Blink Amber Blink Amber

Aging Mode : Raster aging During Power Save, press "POWER switch" button for longer than 4 seconds. Self Test : OSD color-bar indication During Power Save, press "POWER switch" button for longer than 8 seconds.

Power Saving Function

This display meets the power saving guidelines set by the International

ENERGY STAR Program. It is capable of reduced power consumption when

used with a computer equipped with Display Power Management Signaling (DPMS). By sensing the absence of the sync signal coming from the computer, it will reduce the power consumption as follows:

Failure Power LED Mute LED

(On 1.5 sec, Off 0.5 sec)

(On 0.5 sec, Off 1.5 sec)

(1 sec/cycle) (1 sec/cycle)

✔ CAUTION

The Power Saving function will automatically put the display into Active-off state if the power switch is turned on without any video signal input. Once the horizontal and vertical syncs are sensed, the display will automatically return to its Normal operation state.

State

Normal

operation

Suspend (1st step

of power saving) Active-off (2nd

step of power saving)

Power-off

Power consumption

CPD-120AS 130 W (max)

CPD-220AS 150 W (max)

15 W (max)

10 W (max)

Approx. 10 W

Required resumption time

—

Approx. 3 sec.

Approx. 10 sec.

—

u Power indicator

Green

Green ˜ Orange

Orange

Off

✔ Note

1) T o lower the power consumption to 0 W, disconnect the power cord.

Speaker

Off

– 2 –

CPD-220AS

TIMING SPECIFICATION

PRIMARY MODE PRIMARY MODE AT PRODUCTION RESOLUTION 640 X 480 800 X 600 800 X 600 1024 X 768 1024 X 768 1280 X 1024 640 X 400 640 X 480 1152 X 864 1152 X 432 CLOCK 36.000 MHz 40.000 MHz 49.500 MHz 78.750 MHz 94.500 MHz 108.500 MHz 25.175 MHz 25.175 MHz 80.000 MHz 65.000 MHz — HORIZONTAL — H-FREQ 43.269 kHz 37.879 kHz 46.875 kHz 60.023 kHz 68.677 kHz 63.974 kHz 31.469 kHz 31.469 kHz 54.945 kHz 44.890 kHz

H. TOTAL 23.111 26.400 21.333 16.660 14.561 15.631 31.778 31.778 18.200 22.277 H. BLK 5.333 6.400 5.172 3.657 3.725 3.834 6.356 6.356 3.800 4.554 H. FP 1.556 1.000 0.323 0.203 0.508 0.590 0.636 0.636 0.800 1.354 H. SYNC 1.556 3.200 1.616 1.219 1.016 1.180 3.813 3.813 1.400 1.969 H. BP 2.222 2.200 3.232 2.235 2.201 2.065 1.907 1.907 1.600 1.231 H. ACTIV 17.778 20.000 16.162 13.003 10.836 11.797 25.422 25.422 14.400 17.723 — VERTICAL — V. FREQ(Hz) 85.008 Hz 60.317 Hz 75.000 Hz 75.029 Hz 84.997 Hz 60.013 Hz 70.086 Hz 59.940 Hz 59.984 Hz 94.804 Hz

V. TOTAL 509 628 625 800 808 1066 449 525 916 473.5 V. BLK 29 28 25 32 40 42 49 45 52 41.5 V. FP 1111111210615 V. SYNC 3433332254.5 V. BP 25 23 21 28 36 38 35 33 41 22 V. ACTIV 480 600 600 768 768 1024 400 480 864 432 — SYNC — INT(G) NO NO NO NO NO NO NO NO NO NO EXT(H/V)/POLARITY YES -/- YES +/+ YES +/+ NO +/+ YES +/+ YES +/+ YES -/+ YES -/- YES +/+ YES +/+ EXT(CS)/POLARITY NO NO NO NO NO NO NO NO NO NO INT/NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT NON INT INT

MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9 MODE 10

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lines lines lines lines lines lines lines lines lines lines

97.2.18 VER.

WARNING!! NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE DEGAUSS COIL HAS BEEN REMOVED.

SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS SUSPECTED.

– 3 –

CPD-220AS

TABLE OF CONTENTS

Section Title Page

1. GENERAL................................................................... 5

2. DISASSEMBLY

2-1. Cabinet Removal ................................................. 11

2-2. U Board Removal ................................................ 11

2-3. J Board Removal .................................................. 11

2-4. EMI Shield Removal ............................................ 11

2-5. D Board Removal ................................................. 12

2-6. Stand Block Removal .......................................... 13

2-7. Picture Tube Removal .......................................... 13

3. SAFETY RELATED ADJUSTMENT ............. 14

4. ADJUSTMENTS ...................................................... 15

5. DIAGRAMS

5-1. Block Diagram

(with Frame Schematic Diagram) ................... 17

5-2. Circuit Boards Location ...................................... 20

5-3. Schematic Diagrams and Printed Wiring Boards ... 20

(1) Schematic Diagram of D Board .......................... 21

(2) Schematic Diagrams of A and AE2 Boards ....... 29

(3) Schematic Diagrams of DA, J and U Boards ...... 33

5-4. Semiconductors ................................................... 37

6. EXPLODED VIEWS

6-1. Chassis (1) ........................................................... 39

6-2. Chassis (2) ............................................................ 40

6-3. Stand Block .......................................................... 41

6-4. Packing Materials ................................................ 42

7. ELECTRICAL PARTS LIST ............................ 43

– 4 –

SECTION 1

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GENERAL

The operating instructions mentioned here are partial abstracts from the Operating Instruction Manual. The page numbers of the Operating Instruction Manual remein as in the manual.

Warning on Power Connection

• Use the supplied power cord.

For the customers in UK.

If you use the display in UK, please use the supplied UK cable with UK plug.

for 100 to 120 V AC for 220 to 240 V AC for 240 V AC only

• Before disconnecting the power cord, wait at least 30 seconds after turning off the power switch to discharge static electricity from the CRT display surface.

• After the power has been turned on, the CRT is demagnetized for approximately 5 seconds. This generates a strong magnetic field around the bezel which may affect the data stored on magnetic tape or disks near the bezel. Place such magnetic recording equipment and tapes/disks at a distance from this unit.

The socket-outlet shall be installed near the equipment and shall be easily accessible.

Precautions

Functions of Controls

Front

Rear

p CPD-120AS

Continued to the next page ➔

Functions of Controls

p CPD-220AS

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Microphone

Main speaker Display

Å Size button

4 5

d Geometry button

Color

temperature button ? Reset switch

¤ Mute button and

indicator ≥ Volume/Bass

boost button S Centering

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button

Brightness/GPE

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button . Volume –/+

!™

buttons > –/+ Contrast

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button u Power switch

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and indicator Sub woofer

Functions of Controls

The internal microphone is turned off when an external microphone is connected.

— Displays OSD when adjusting. Adjusts picture size (page 20). Adjusts pincushion and rotation (pages 21, 22). Adjusts color temperature (page 23).

Resets adjustments to factory setting (page 24). Mutes sound (page 17).

Adjusts speaker volume or selects bass boost mode (page 26).

Adjusts picture centering (page 19).

Adjusts picture brightness or selects GPE mode (page

25). Adjusts speaker volume (page 16).

The default setting of the volume level is 30 %. Adjusts picture contrast (page 17).

Turns on and off the display.

—

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– 5 –

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AC IN connector

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2 Audio plug (green)

h MIC plug (red)

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; Video signal cable

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(blue)

USB downstream

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connector h Microphone jack

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2 Headphones jack

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Tilt-Swivel

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USB upstream

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connector

Connect the supplied power cord (page 12). Connect to the computer’s speaker output

(page 11). Connect to the computer’s microphone input (page

11). Connect to the computer’s video output

(page 11). Connect to a USB device (page 11).

Connect a microphone (not supplied). Connect headphones (not supplied). The speakers are

turned off when headphones are connected. Adjusts the angle of the display (page 14). Connect to the computer’s USB ports when using a

USB (universal serial bus) device connected to the display (page 11).

Functions of Controls

Getting Started

Before using this display, please make sure that the following items are included in your package:

• Multimedia computer display (1)

• Warranty card (1)

• Operating instruction manual (1)

• Windows 95 Monitor Information Disk and its instruction manual (1)

✎

Tip

This display will sync with any IBM or compatible system equipped with VGA capability. Although this display will sync to other platforms running at horizontal frequencies between 30 and 70 kHz, including Macintosh required. Please consult Sony Technical Support for advice on which adapter is suitable for your needs.

1) VGA is a trademark of IBM Corporation.

2) Macintosh is a trademark of Apple Computer Inc.

and Power Macintosh systems, a cable adapter is

or greater graphics

p CPD-120AS

p CPD-220AS

to USB port

Blue (to display connector)

Green (to speaker connector)

Red (to microphone connector)

to USB port

Computer

Installation

p Step 1: Connect the computer

With the computer switched off, connect the video signal cable to the display (VGA) connector on your computer. If your computer supports the DDC plugand-play standard, this connection will enable the DDC communication between the display and the computer. Also the video signal cable is combined with audio and microphone cables. If your computer is equipped with sound capability, connect the audio and microphone plugs to appropriate jacks located on your computer. If you use a USB (universal serial bus) device, connect the USB device to the USB downstream jack and the PC to the USB upstream jack.

Getting Started

p Step 2: Connect the power cord

With the display switched off, connect the power cord to the display and the other end to a power outlet.

p CPD-120AS

to a power outlet

Power cord (supplied)

p CPD-220AS

to a power outlet

Power cord (supplied)

p Step 3: Turn on the display and computer. p Step 4: If necessary...

Adjust the user controls according to your personal preference.

The installation of your display is complete. Enjoy your display.

Blue (to display connector)

Green (to speaker connector)

Red (to microphone connector)

✔

Note on handling the video signal cable

Do not touch the pins of the video signal cable.

✔

Note on USB ports USB ports are included to provide state-of-the-art technology. Until USB support is available at the operating system level, you must supply drivers to use USB devices. You can upgrade your operating system to a version that supports USB at the operating system level once a version becomes available. See the manual that came with your USB device for more information on setting it up and using it.

Continued to the next page ➔

Getting Started

Using Y our Display

Preset and user modes

The Multiscan CPD-120AS/220AS display has factory preset modes for the 10 most popular industry standards for true “plug and play” capability. For less common modes, its Digital Multiscan Technology will perform all of the complex adjustments necessary to ensure a high quality picture for any timing between 30 and 70 kHz.

NO.

Resolution (dots × lines)

640 × 400

640 × 480

800 × 600

1024 × 768

1152 × 864

1280 × 1024

✔

Note for Windows® 95 users

Install the new model information of the Sony computer display from “Windows 95 Monitor Information disk” into your PC. (To install the file, refer to the attached “About the Windows 95 Monitor Infomration Disk”.)

This display complies with “VESA DDC,” the standards of Plug & Play. If your PC/graphic board complies with DDC, select “Plug & Play Display (VESA DDC)” or this display’s model name (CPD120AS/220AS) as “Display type” from “Control Panel” on Windows 95. Some PC/graphic boards do not comply with DDC. Even if they comply with DDC, that may have some problems on connecting this display. In this case, select this display’s model name (CPD-120AS/220AS) as “Display type” on Windows 95.

is a registered trademark of Microsoft Corporation in the United States and other

Windows countries.

✔

Note on recommended horizontal timing conditions Horizontal sync width should be more than 1.0 µsec. Horizontal blanking width should be more than 3.6 µsec.

Horizontal Frequency

31.5 kHz

43.3 kHz

37.9 kHz

46.9 kHz

60.0 kHz

68.7 kHz

44.8 kHz

54.8 kHz

64.0 kHz

Vertical Frequency

70 Hz 60 Hz 85 Hz 60 Hz 75 Hz 75 Hz 85 Hz 47 Hz (95 Hz interlace) 60 Hz 60 Hz

Continued to the next page ➔

Getting Started

– 6 –

Using Your Display

p To enter new timings

When using a video mode that is not one of the 10 factory preset modes, some fine tuning may be required to optimize the display to your preferences. Simply adjust the display according to the adjustment instructions. The adjustments will be stored automatically and recalled whenever that mode is used. A total of 10 user-defined modes can be stored in memory. If an 11th mode is entered, it will replace the first.

Using the tilt-swivel

With the tilt-swivel, this unit can be adjusted to be viewed at your desired angle within 90° horizontally and 7° vertically. To turn the unit vertically and horizontally, hold it at its bottom with both hands. Pay attention not to get your hands caught between the display and the tiltswivel.

45˚

7˚

45˚

Damper wire

Using a white background, very thin horizontal lines on the screen are visible as shown below. These lines are the damper wires. The Trinitron tube has a vertically striped Aperture Grille inside. The Aperture Grille allows more light to pass through to the screen giving the Trinitron CRT more color and brightness. The damper wires are attached to the Aperture Grille to prevent vibration of the Aperture Grille wire so that the screen image is constantly stable.

Approx. 6 cm (2 (CPD-220AS only)

Damper wires

Approx. 6 cm (2

/8 inches)

Using Your Display

Adjustments

When one of the preset-type signals is input, no picture adjustment is necessary. You can, however, adjust the picture to your preference by following the procedure described below.

To adjust the display, turn on the display and computer. Select the adjustment item. You can adjust all items via the OSD (On Screen Display). Adjustments are automatically stored in the display’s memory.

Control Panel

Adjusting volume

Press the . + or – button. The VOLUME/CONTRAST OSD appears. The horizontal and vertical frequencies for each input signal received appear.

Horizontal

Press the . +/– buttons to adjust volume. + to increase volume – to decrease volume

frequency

Vertical frequency

Using Your Display

The VOLUME/CONTRAST OSD disappears 3 seconds after you release the buttons.

✎

Tips

• The default setting of the volume level is 30 %.

• Adjust the volume while listening to the sound.

• Excessively high volume may cause howling.

p To mute the sound

Press the ¤ button. The ¤ indicator lights. The light indicates mute function is in active mode.

Press again to cancel muting. You can cancel muting also by pressing the . + button.

✎

Tip

¤ appears instead of . on the VOLUME/CONTRAST OSD while the sound is muted.

Adjusting the picture contrast

The adjustment data becomes the common setting for all input signals.

Press the > + or – button. The VOLUME/CONTRAST OSD appears. The horizontal and vertical frequencies for each input signal received appear.

Continued to the next page ➔

Adjustments

– 7 –

Press the > +/– buttons to adjust the picture contrast. + for more contrast – for less contrast

The VOLUME/CONTRAST OSD disappears 3 seconds after you release the buttons.

Adjusting the picture centering

The adjustment data becomes the individual setting for each input signal received.

Press the S button. The CENTER OSD appears.

Adjusting the picture brightness

The adjustment data becomes the common setting for all input signals.

Press the button. The BRIGHTNESS/GPE OSD appears.

Press the . +/– buttons to adjust the picture brightness. + for more brightness – for less brightness

To exit the OSD

Press the button again.

✎

Tip

If you don’t touch any buttons the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Adjustments

For vertical adjustment For horizontal adjustment

Press the . +/– buttons. Press the > +/– buttons. + to move up + to move right – to move down – to move left

To exit the OSD

Press the S button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Adjustments

Adjusting the picture size

The adjustment data becomes the individual setting for each input signal received.

Press the Å button. The SIZE OSD appears.

For vertical adjustment For horizontal adjustment

Press the . +/– buttons. Press the > +/– buttons. + to increase + to increase – to decrease – to decrease

To exit the OSD

Press the Å button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Adjustments

Adjusting the picture rotation

The adjustment data becomes the common setting for all input signals.

Press the d button. The GEOMETRY OSD appears.

Press the . +/– buttons. + to rotate clockwise – to rotate counterclockwise

To exit the OSD

Press the d button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

– 8 –

Adjustments

Adjusting the pincushion

The adjustment data becomes the individual setting for each input signal received.

Press the d button. The GEOMETRY OSD appears.

Press the > +/– buttons. + to expand the picture sides

– to diminish the picture sides

To exit the OSD

Press the d button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Adjustments

Setting the color temperature

The selected color temperature becomes the common setting for all input signals.

Press the button. The COLOR TEMPERATURE OSD appears.

Adjust with the . +/– and > +/– buttons. To select 5000K or 9300K

Press > +/– buttons. The selected color temperature is indicated. + to select 9300K – to select 5000K

To obtain the desired color temperature between 5000K and 9300K

Press . +/– buttons. + for higher temperature – for lower temperature

✎

Tip

The first press of . + or – button recalls the color temperature which was obtained at the last adjustment.

To exit the OSD

Press the button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Adjustments

Resetting

p To recall the factory settings for individual adjustment

item

Press the button of the adjustment item you want to recall the factory settings, and then press the ? button immediately before the OSD disappears.

p To recall the factory settings for the current mode

Press the ? button immediately when no OSD is shown.

p To recall the factory settings for all modes

Press and hold the ? button for 2 seconds. All adjustments return to the factory settings.

Adjustments

Available Features

Selecting Graphic Picture Enhancement (GPE)

There are 4 GPE modes from “0” through “3,” and the picture is more vivid at a higher number. You can enjoy movies and games with striking visuals by enhancing the picture sharpness. Default setting is “0.”

Press the button. The BRIGHTNESS/GPE OSD appears.

Press the > +/– buttons to select the GPE mode. + for higher number – for lower number

You can adjust the brightness on the same OSD by pressing the . +/– buttons.

To exit the OSD

Press the button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

✔

Notes on GPE mode For text oriented applications such as word processing and spreadsheets, set the GPE mode to “0” (default setting). GPE (Graphic Picture Enhancement) mode is reset to “0” when:

• you turn off the display

• the PC recovered from the power saving mode

• the resolution is changed

Available Features

– 9 –

Selecting Bass Boost

There are 3 Bass Boost modes from “0” through “2,” and bass is boosted more at a higher number. The factory setting is “1” (normal mode). You can enjoy games and music programs with lively sound by selecting “2.” When you use the PC phone, select “0.” You will be able to hear the caller’s voice more easily as the high-pitched tone is reduced.

Press the ≥ button. The VOLUME/BASS BOOST OSD appears.

Press the > +/– buttons to select the BASS BOOST mode. + for higher number – for lower number

After selecting the Bass Boost mode, you can adjust the volume on the same OSD. Press the . +/– buttons. + to increase volume – to decrease volume

To exit the OSD

Press the ≥ button again.

✎

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds. When you want to adjust another item, press the button of the item. The OSD of the selected item appears.

Available Features

Troubleshooting

This section may help you isolate a problem and as a result, eliminate the need to contact technical support, allowing continued productivity.

No picture

If the u indicator is not lit

m Check that the power cord is properly connected. m Check that the u switch is in the “ON” position.

If the u indicator is lit in orange, or alternately in orange and green

m Check that your computer power switch is in the “ON” position. m The display may recover when you press any key on the keyboard of the

computer.

m Check that the video cable is properly connected. m Ensure that no pins are bent or pushed in the HD15 connector of the cable. m Check that the video card in your computer is seated completely in a proper

bus slot.

m Check that the video sync signal is within that specified for the display. m This display has a self-diagnostics function. To activate the function, turn off

the computer and the display. Press and hold the u switch of the display for about 8 seconds. If the display is operating correctly, the screen will become white first and then the color bars will appear.

If the u indicator is flashing in orange

m Check that the video sync signal is specified for the display. m There is a potential display failure. Contact Sony Technical Support.

No sound from speaker

If the ¤ indicator is lit

m Press the ¤ button to cancel muting.

m Check that the audio plug is properly connected. m Adjust the volume with . +/– buttons. m Check that the headphones are not connected. m Check that the sound board of the computer is properly connected. m Check that the volume control, muting, sound selector, etc. of the sound

board. (See the computer’s manual.)

Microphone mixing is not possible

m Check that the MIC plug is properly connected. m Check that the sound board of the computer is properly connected. m Check that the microphone control, sound selector, etc. of the sound board.

(See the computer’s manual.)

Troubleshooting

Howling (feed-back) is heard

m Decrease the volume with . +/– buttons, or turn down the microphone

input volume of the sound board.

Picture is scrambled

m Check your graphics board manual for the proper display setting on the

display.

m Check this manual and confirm that the graphic mode and the frequency at

which you are trying to operate is supported. Even within the proper range, some video boards may have a sync pulse that is too narrow for the display to sync correctly.

Color is not uniform

m Trip the u switch once to activate the Auto-degauss cycle*.

Picture is flickering

m If the refresh rate is not appropriate, the picture may flicker. Set the refresh

rate of the non-interlace mode as high as possible on the computer. For details on how to set the refresh rate, consult the dealer of your computer or video board.

Screen image is not centered or sized properly

m Adjust picture centering, size, or geometry (rotation/ pincushion) on the OSD

(pages 19–22).

m Some video modes do not fill the screen to the edge of the display. There is

no single answer to solve the problem. There is a tendency for this problem to occur on higher refresh timings.

Picture is fuzzy

m Adjust the contrast and brightness on the OSD (pages 17, 18). Some brands

of SVGA boards have an excessive video output level which creates a fuzzy picture at maximum contrast.

m The GPE setting may not be proper for the picture. Selecting a lower GPE

number may improve the picture (page 25).

m Trip the u switch once to activate the Auto-degauss cycle*.

Picture bounces or has wavy oscillations

m Isolate and eliminate any potential sources of electric or magnetic fields.

Common causes for this symptom are electric fans, fluorescent lighting, laser printers, etc.

m If you have another display close to this display, increase the distance

between them to reduce interference.

m Try plugging the display into a different AC outlet, preferably on a different

circuit.

Picture appears to be ghosting

m Eliminate the use of video extension cables and/or video switch boxes if this

symptom occurs. Excessive cable length or weak connections can produce this symptom.

Continued to the next page ➔

Troubleshooting

Fine horizontal lines (wires) are visible

m These wires stabilize the vertically striped Aperture Grille. The Aperture

Grille allows more light to pass through to the screen giving the Trinitron CRT more color and brightness.

Wavy or elliptical (moire) pattern is visible

m Due to the relationship between resolution, display Aperture Grille pitch and

the pitch of some image patterns, certain screen backgrounds, especially gray, sometimes show moire which looks like wavy lines. This can only be eliminated by changing your desktop pattern.

Hum is heard right after the power is turned on

m When the power is turned on, the Auto-degauss cycle* is activated. While the

Auto-degauss cycle is activated, a hum may be heard for about 3 seconds. This is not a malfunction.

* The Auto-degauss function demagnetizes the metal frame of the CRT to obtain a

neutral field for uniform color reproduction. If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result.

• If the problem persists, call your authorized Sony dealer from a location near you, or call Sony Technical Support.

• Note the model name and the serial number of your display. Also note the make and name of your computer and video board.

Troubleshooting

– 10 –

SECTION 2

DISASSEMBLY

2-1. CABINET REMOVAL 2-2. U BOARD REMOVAL

Two screws (+BVTP 4 x 16)

Two screws (+BVTP 3 x 12)

U board

CPD-220AS

Cabinet

Two screws (+BVTP 4 x 16)

Stand base (Rear)

2-3. J BOARD REMOVAL 2-4. EMI SHIELD REMOVAL

Two screws (+BVTP 4 x 16)

J board

Two screws (+BVTT 3 x 8)

Two screws (+BVTP 4 x 16)

Two screws (+BVTT 3 x 8)

GND

Stand base (Lower)

Eight screws (+BVTP 4 x 16)

Screw (+BVTP 3 x 12)

– 11 –

Two screws (+BVTT 3 x 8)

GND

EMI shield

CPD-220AS

2-5. D BOARD REMOVAL

Anode cap

CN311

CN503

GND

A block

Screw (+BVTT 4 x 8)

Cable stopper

Two screws (+BVTP 3 x 12)

Cable blacket

CN507

CN607

CN501

Two screws (+BVTP 3 x 12)

D board

GND

CN601

• REMOVAL OF ANODE-CAP

NOTE: Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield or carbon painted on the CRT, after

• REMOVING PROCEDURES

• HOW TO HANDLE AN ANODE-CAP

1 2 Don’t press the rubber hardly not to hurt inside of anode-caps!

3 Don’t turn the foot of rubber over hardly!

removing the anode.

Turn up one side of the rubber cap in the direction indicated by the arrow a.

2 Using a thumb pull up the rubber cap

firmly in the direction indicated by the arrow b.

Don’t hurt the surface of anode-caps with shartp shaped material! A material fitting called as shatter-hook terminal is built in the

rubber. The shatter-hook terminal will stick out or hurt the rubber.

Anode Button

3 When one side of the rubber cap is

separated from the anode button, the anode-cap can be removed by turning up the rubber cap and pulling up it in the direction of the arrow c.

– 12 –

CPD-220AS

2-6. STAND BLOCK REMOVAL

A block

GND

Speaker lead

Screw (+BVTP 4 x 16)

Two screws (+BVTT 4 x 10)

GND

CN501

CN503

Speaker lead

GND

Screw (+BVTP 4 x 16)

Two screws (+BVTT 4 x 10)

Stand block

CN601

Connector

Anode cap

2-7. PICTURE TUBE REMOVAL

Two tapping screws (5)

Picture tube

Cushion

Two tapping screws (5)

Picture tube shied

GND

Neck assy

Deflection yoke

– 13 –

Cushion

+ 29 hidden pages