Sony KV-G21MW3, KV-G21QW3 Service manual

SERVICE MANUAL BG-2S

MODEL COMMANDER DEST. CHASSIS NO.MODEL COMMANDER DEST. CHASSIS NO.

KV-G21MW3 RM-869 ME SCC-U07U-A KV-G21QW3 RM-869 ME SCC-U07T-A

CHASSIS

TRINITRON

COLOR TV

KV-G21MW3/G21QW3

RM-869

SPECIFICATIONS

Power requirements 110-240 V AC, 50/60 Hz Power consumption (W) Indicated on the rear of the TV Television system B/G KV-G21QW3

B/G, I, D/K, M KV-G21MW3

Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58 KV-G21MW3

PAL, PAL 60, SECAM, NTSC4.43 KV-G21QW3

Channel coverage VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41 Audio output (speaker) 3W + 3W Inputs ˘ (antenna): 75 ohms external terminal

… (video input) jacks: phono jacks

D (video): 1 Vp-p, 75 ohms

≥ (audio): 500 mVrms, high impedance

Outputs A (earphone) jack: mini jack

Ú (monitor output) jacks: phono jacks

D (video): 1 Vp-p, 75 ohms

≥ (audio): 500 mVrms

Picture tube 21 in.

Tube size (cm) 54 Measured diagonally Screen size (cm) 51 Measured diagonally

Dimensions (w/h/d, mm) 516 × 464 × 478 Mass (kg) 22

Note

CAUTION

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 THE ANODE.

Design and specifications are subject to change without notice.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE SCHEMA TIC DIA GRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

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KV -G21MW3/G21QW3

TABLE OF CONTENTS

Section Title Page Section Title Page

RM-869

SELF DIAGNOSIS FUNCTION.................................. 4

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

2. DISASSEMBLY

2-1. Rear Cover Removal ............................................ 10

2-2. A Board Removal ................................................ 10

2-3. Service Position ................................................... 10

2-4. Replacement of Parts ........................................... 11

2-4-1. Replacement of Multi Button .................................... 11

2-4-2. Replacement of Light Guide ..................................... 11

2-5. Terminal Board Bracket Removal ....................... 11

2-6. Demagnetization Coil Removal .......................... 11

2-7. Picture Tube Removal.......................................... 12

3. SET-UP ADJUSTMENTS

3-1. Beam Landing ...................................................... 13

3-2. Convergence......................................................... 14

3-3. Focus Adjustment ................................................ 15

3-4. Remote Commander Adjustment ........................ 16

3-5. G2 (Screen) and White Balance Adjustments..... 16

4. CIRCUIT ADJUSTMENTS

4-1. Adjustments with Commander ............................ 17

4-2. Adjustment Method ............................................. 18

4-3. A Board Adjustment after IC003 (Memory)

Replacement......................................................... 23

4-4. Picture Distortion Adjustment ............................. 23

5. DIAGRAMS

5-1. Block Diagram ...................................................... 25

5-2. Circuit Boards Location ....................................... 28

5-3. Schematic Diagrams and Printed Wiring Boards 28

(1) Schematic Diagram of A Board ........................... 33

(2) Schematic Diagram of C Board ........................... 37

5-4. Semiconductors..................................................... 41

6. EXPLODED VIEW

6-1. Chassis .................................................................. 43

7. ELECTRICAL PARTS LIST.................................... 45

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KV-G21MW3/G21QW3

RM-869

SELF DIAGNOSIS FUNCTION

If no acknowledgement is returned from a device which is turned "ON", the device has a problem. In this case, one of the LED's responding to the problem device will flicker a defined number of times.

Flickering is operated by lighting the LED's for 60ss each time.

The flickering frequency responding to each failed device is shown below.

Board name Ref. No.

Device

Flickering Frequency

All the devices are checked one after another from the left of the table. If an error is found, the responding LED will start flickering. So, if more than 1 device have failed, only the one on the left side will flicker.

A Board

IC003

NONVOLATILE

MEMORY

(ST24C08FB6)

A Board

IC300

Y/C JUNGLE

(TDA8374A)

– 4 –

– PROGR +

SELECT

– PROGR +

– VOLUME +

TV/VIDEO

SELECT

VHF LOW B/G

The operating instructions mentioned here are partial abstracts

SECTION 1

from the Operating Instruction Manual. The page numbers of the Operating Instruction Manual remain as in the manual.

GENERAL

– 5 –

KV -G21MW3/G21QW3

RM-869

Getting Started

-EN

Connecting a VHF antenna or a combination VHF/UHF antenna — 75-ohm coaxial cable (round)

Attach an optional IEC antenna connector to the 75-ohm coaxial cable. Plug the connector into the

(antenna) socket at the rear of the TV.

Connections

On a wall

Getting Started

Rear of TV

Getting Started

-EN

Connecting optional equipment

You can connect optional audio/video equipment to your TV such as a VCR, multi disc player, camcorder, or video game.

Connecting video equipment using the

…

(video input) jack

When connecting video equipment to the

…

(video input) jack

Do not connect video equipment to the

…

(video input) jacks at the front and the rear of your TV simultaneously; otherwise the picture

will not be displayed properly on the screen.

Connecting audio/video equipment using the

(monitor output) jack

Rear of TV

to antenna socket

VCR

to antenna output

≥

…

to video and audio inputs

: Signal flow

Rear of TV

to antenna output

to video and audio outputs

VCR

to antenna socket

≥

…

: Signal flow

Front of TV

Camcorder

…

≥

to video and audio outputs

: Signal flow

…

(video input)

(video) and

≥

(audio) inputs

(monitor output)

(video) and

≥

(audio) outputs

…

(video input)

(video) and

≥

(audio) inputs

When recording through the

(monitor output) jack

Do not change the channel or video input while recording with a VCR; otherwise the channel or video input you are recording als

o will be

changed.

KV-G21MW3/G21QW3

RM-869

– 6 –

Getting Started

-EN

Press +/– on the remote commander or

+/– on the TV again.

To start presetting channels automatically from the specified program position

Press PROGR +/– or number buttons on the remote commander or PROGR +/– on the TV until the required program position appears on the screen after step 4 of “Presetting channels automatically”.

Presetting channels manually

Press SELECT on the remote commander or the TV until “TV SYSTEM” appears on the screen (for

KV-G21MW3

only).

Press +/– on the remote commander or

+/– on the TV to select the TV system (for

KV-G21MW3

only).

Press SELECT on the remote commander or the TV until “MANUAL PROGRAM

” appears

on the screen.

Press +/– on the remote commander or

+/– on the TV.

Press PROGR +/

– or number buttons on the

remote commander or PROGR +/

– on the TV until the required program position appears on the screen.

Press +/– on the remote commander or

+/– on the TV until the required channel

picture appears on the screen.

Press SELECT on the remote commander or the TV.

Disabling program positions

Press PROGR +/

– or number buttons on the

remote commander or PROGR +/

– on the TV until the unused or unwanted program position appears on the screen.

Press SELECT on the remote commander or the TV until “MANUAL PROGRAM

” appears

on the screen.

Press +/– on the remote commander or

+/– on the TV.

Press PIC MODE on the remote commander.

Press SELECT on the remote commander or the TV.

To preset the disabled program position again

Preset the channel quickly, automatically or manually

TV SYSTEM

SELECT SELECT

B/G I D/K M

–

MANUAL PROGRAM

SELECT

PROGR

– PROGR +

VHF LOW B/G

–

SELECT

–

PROGR

– PROGR +

–

Getting Started

-EN

Presetting channels

If the picture color is poor and/or the sound is noisy (for KV-G21MW3 only)

Select the appropriate TV system as follows: 1 Press SELECT on the remote commander or the TV

until “TV SYSTEM” appears.

2 Press +/– on the remote commander or

+/– on the TV until the picture and sound becomes normal.

Notes

• If you do not know your local TV system, consult your nearest

authorized service center or dealer.

• The setting of the

“TV SYSTEM” is memorized for each

program position.

Presetting channels automatically

Press SELECT on the remote commander or the TV until “TV SYSTEM” appears on the screen (for KV-G21MW3 only).

Press +/– on the remote commander or

+/– on the TV to select the TV system

(for KV-G21MW3 only).

Press SELECT on the remote commander or the TV until “AUTO PROGRAM

” appears on

the screen.

Press +/– on the remote commander or

+/– on the TV.

You can preset up to 100 TV channels in numerical sequence from program position 1 using the buttons on the remote commander or the TV.

You can preset TV channels quickly, automatically or manually.

Quick channel presetting

Press

to turn on the TV.

When the TV is turned on in standby mode, press

on the remote commander.

Press SELECT and PROGR + on the TV simultaneously for one to two seconds.

Remote commander

TV SYSTEM

SELECT SELECT

– PROGR +

SELECT

–

PROGR

–

TV/VIDEO

SELECT

Number

PROGR +/–

+/–

SELECT

AUTO PROGRAM

SELECT SELECT

B/G I D/K M

–

VHF LOW B/G

–

Front of TV

– 7 –

KV -G21MW3/G21QW3

RM-869

Operations

-EN

Watching the TV

Turning off the TV

To turn off the TV temporarily

Press

on the remote commander. The

indicator

on the TV lights up.

To turn off the TV completely

Press

on the TV.

If the power on the TV is turned off in standby mode, the

indicator on the TV may remain alight for a while.

Watching the video input

Press

… F

To watch TV

Press

;

Muting the sound

Press

to turn on the TV.

When the TV is turned on in standby mode, press

on the remote commander.

Select the TV program you want to watch.

To select a program position directly

Press the number button.

To select a two-digit program position, press “-/--” before the number buttons. For example: to select program position 25, press “-/--”, and then “2” and “5”.

To scan through program positions

Press PROGR +/

– until the program position you

want appears.

Press

+/– to adjust the volume.

PROGR

Operations

MUTING

…

VIDEO

;

Operations

-EN

AUTO B/G DYNAMIC

-EN

• If no buttons or controls are pressed for more than two hours

after the TV is turned on using the Wake Up Timer, the TV automatically turns into standby mode. If you want to continue watching the TV, press any button or control on the TV or remote commander.

After 30 minutes

After 60 minutes

After 90 minutes

No sleep timer

SLEEP TIMER:30M

SLEEP TIMER:60M

SLEEP TIMER:OFF

SLEEP TIMER:90M

Displaying on-screen information

Press

The program position, local system, and TV settings are displayed on the screen.

Setting the Sleep Timer

You can set the TV automatically turned off as you program.

Press

To cancel the Sleep Timer, press

repeatedly

until “SLEEP TIMER: OFF

” appears, or turn off the TV.

Changing the on-screen display language

You can use buttons on the remote commander or the TV to change the on-screen display language.

Press SELECT until the screen appears as follows:

Press +/– to select “

”.

Note

• You can also use SELECT and

+/– on the TV to select the

on-screen display language.

Setting the Wake Up Timer

You can set the TV automatically turned on as you program.

Press

repeatedly to set the timer.

The on-screen display appears and the

indicator

on the TV lights up.

If you want a particular TV program or video input to be displayed using the Wake Up Timer, select the TV program or video input.

Press

on the remote commander or set the Sleep Timer to turn off the TV in standby mode.

To cancel the Wake Up Timer, press

repeatedly

until “WAKE UP TIMER: OFF

” appears, or turn off the

main power of the TV.

Notes

• The Wake Up Timer starts immediately after the on-screen

display disappears.

• The last TV program position or video input just before the TV

turns into standby mode will appear when the TV is turned on using the Wake Up Timer.

After 10 minutes

No wake up timer

After 12 hours

WAKE UP TIMER:10M

WAKE UP TIMER:OFF

WAKE UP TIMER:12H00M

+/– SELECT

LANGUAGE /

: ENGLISH

SELECT

: LANGUAGE /

– 8 –

KV-G21MW3/G21QW3

RM-869

Additional Information

-EN

Troubleshooting

No picture No sound

/Press

/Check the antenna connection. /Check the VCR connections. /Check the power cord connection. /Check the standby mode.

Good picture No sound

/ Press

No color

/Adjust the COLOR level in the on-screen

display.

/Check the COLOR SYSTEM setting.

TV cabinet creaks

/Even if the picture or the sound is normal,

changes in the room temperature sometimes make the TV cabinet expand or contract, making a noise. This does not indicate a malfunction.

Note on the remote commander

• The supplied remote commander is used on several models of

the TV. If you do not find instructions for some controls that are on the remote commander, that means your TV does not employ the features of those controls, e.g.

and SOUND

MODE.

Notes

• When you turn on the TV, you may hear the

“boon” sound that is caused by the demagnetization of the TV. This does not indicate a malfunction.

• The picture color may become abnormal if you change the

direction of your TV. To obtain the normal picture color, press

on the TV to turn off the TV for five minutes and then turn

it on again.

• Design and specifications are subject to change without notice.

• All contents in the instruction manual are subject to change

without notice.

WARNING

Do not install the appliance in a confined space, such as a bookcase or built-in cabinet.

If you have any problems, read this manual again and check the countermeasure for each of the symptoms listed below. If the problem persists after trying the methods below, contact your nearest authorized service center or dealer.

Snowy picture Noisy sound

/Check the antenna. /Check the antenna connection on the TV

and on the wall.

/Check the TV SYSTEM setting (for

KV-G21MW3 only).

Dotted lines or stripes

/ This may be caused by local interference

(e.g. cars, neon signs and hair dryers). Adjust the antenna for minimum interference.

Double images or

“ghosts”

/ This may be caused by reflections from

nearby mountains or buildings. A highly directional antenna may improve the picture.

Good picture Noisy sound

/Check the TV SYSTEM setting (for

KV-G21MW3 only).

Additional Information

Operations

-EN

Adjusting the picture

Each time you press SELECT, the screen changes as follows:

Press +/– to adjust the item.

To adjust other items, repeat steps 1 and 2.

Note

• You can also use SELECT and

+/– on the TV to adjust the

picture setting.

If the picture color is abnormal when receiving programs through the

(antenna) terminal

Change the “TV SYSTEM” (for KV-G21MW3 only) or “COLOR SYSTEM

” setting or adjust the

“COLOR”

level in the on-screen display until the color becomes normal.

If the picture is abnormal when receiving programs through the

…

(video input) jack

Change the “COLOR SYSTEM

” setting or adjust the

“COLOR” level in the on-screen display until the color

becomes normal.

Note

• Normally set “COLOR SYSTEM

” to “AUTO”.

If the sound is distorted or noisy when receiving programs through the

(antenna)

terminal

Change the “TV SYSTEM” setting (for KV-G21MW3 only) in the on-screen display until the sound becomes clear.

Note on the SOUND MODE button

• The sound mode feature is unavailable for your TV. Thus, the

SOUND MODE button on the remote commander is not used for your TV.

Selecting the picture mode

Press PIC MODE until the mode you want appears.

Each time you press PIC MODE, the screen changes as follows:

Note

• If you change the picture mode after the following

adjustments, the adjustment changes in accordance with the picture mode.

Adjusting the picture setting

Press SELECT until the item you want to adjust appears.

SOUND

MODE

SELECT PIC MODE

PIC MODE

High contrast picture

Soft picture (good for video games)

DYNAMIC

STANDARD

SOFT

+/–

SELECT

PICTURE

COLOR

BRIGHT

HUE

SHARPNESS

(Operative for NTSC signal only)

…

SELECT

–

PROGR

–

Front of TV

Normal picture

– 9 –

KV -G21MW3/G21QW3

RM-869

SECTION 2

Four screws (BVTP 4×16)

Two screws (BVTP 4×16)

Lever

A board

DISASSEMBLY

KV-G21MW3/G21QW3

2-1. REAR COVER REMOVAL

– 10 –

2-2. A BOARD REMOVAL

2-3. SERVICE POSITION

RM-869

2-4. REPLACEMENT OF PARTS

Two claws

A board

Terminal board bracket

A board

Terminal board bracket

Demagnetization coil

Tension spring

Picture tube

Cut

Multi button

Three screws (BVTP 3×12)

• SCREWING TORQUE 7±1 kg•cm

Light guide

Cut

Light guide

Two screws (BVTP 3×12)

• SCREWING TORQUE 7±1 kg•cm

For replacement of the Multi Button and Light Guide, cut the welded portions from them, exchange with the new parts, and fix them with screws (+BVTP) respectively.

2-4-1. REPLACEMENT OF MULTI BUTTON

2-5. TERMINAL BOARD BRACKET REMOVAL

– 11 –

2-4-2. REPLACEMENT OF LIGHT GUIDE

2-6. DEMAGNETIZATION COIL REMOVAL

KV -G21MW3/G21QW3

RM-869

2-7. PICTURE TUBE REMOV AL

2 A board

4 C board

5 Deflection yoke

Cushion

6 Four screws (Tapping screws)

1 Anode cap

Anode button

– 12 –

KV-G21MW3/G21QW3

RM-869

2 Using a thumb press down, then pull up the rubber cap firmly in the direction indicated

by the arrow b.

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 it up in the direction of the arrow c.

• HOW TO HANDLE AN ANODE-CAP

• REMOVAL OF ANODE-CAP

NOTE : After removing the anode, short circuit the anode of the picture tube and the

• REMOVING PROCEDURES

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

anode cap to the metal chassis, CRT shield or carbon paint on the CRT.

1 Do not damage the surface of anode-cap with sharp shaped objects. 2 Do not press the rubber too hard so as not to damage the inside of anode-cap.

A metal fitting called the shatter-hook terminal is built into the rubber.

3 Do not turn the foot of rubber over too hard.

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

+ 28 hidden pages