Sony KV-T21PF1 Service Manual

TRINITRON

®

COLOR TV

MODEL COMMANDER DEST. CHASSIS NO.

KV-T21PF1

RM-870 India SCC-K67D-A

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO.

BG-1S (D)

CHASSIS

– 2 –

KV-T21PF1

RM-870

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.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON
THE SCHEMATIC DIAGRAMS, 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.

SPECIFICATIONS

Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G
Color system PAL, PAL 60, NTSC4.43, NTSC3.58 (AV IN)
Channel coverage

B/G VHF: E2 to E12/UHF: E21 to E69/CATV: S01 to S03, S1 to S41

Audio output (speaker) 3W + 3W
Inputs Antenna: 75 ohms

VIDEO IN jacks: phono jacks

Video: 1 Vp-p, 75 ohms
Audio: 500mVrms, high impedance

Outputs Headphone jack: minijack

MONITOR OUT jacks: phono jacks

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) 527 × 464 × 471
Mass (kg) 22

Design and specifications are subject to change without notice.

– 3 –

KV-T21PF1

RM-870

TABLE OF CONTENTS

Section Title Page Section Title Page

5. CIRCUIT ADJUSTMENTS

5-1. Adjustment With Commander ................................. 18

5-2. Adjustment Method ................................................. 19

5-3. A Board, Adjustment After IC003

(MEMORY) Replacement....................................... 22

5-4. Picture Distortion Adjustment ................................. 22

6. DIAGRAMS

6-1. Block Diagram ......................................................... 23

6-2. Circuit Boards Location .......................................... 25

6-3. Schematic Diagrams and Printed Wiring Boards ... 25

(1) Schematic Diagram of A Board............................... 29

(2) Schematic Diagrams of A11, A12 and C Boards .... 33

6-4. Semiconductors........................................................ 37

7. EXPLODED VIEW ........................................................ 39

8. ELECTRICAL PARTS LIST ...................................... 41

1. GENERAL ........................................................................ 4

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 and Power Button.. 11

2-5. Demagnetization Coil Removal .............................. 11

2-6. Picture Tube Removal ............................................. 12

3. SET-UP ADJUSTMENTS

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

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

3-3. Focus Adjustment .................................................... 16

3-4. G2 (Screen) and White Balance Adjustment .......... 16

4. SELF DIAGNOSIS FUNCTION ......................... 17

– 4 –

KV -T21PF1

RM-870

SECTION 1

GENERAL

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

2

3

B/G I D/K M

TV SYSTEM

AUTO PROGR

TV SYSTEM

AUTO PROGR

Note) TV SYSTEM is not used for this model.

– 5 –

KV -T21PF1

RM-870

Getting Started

4

Connections

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.

Getting Started

On a wall

or

Rear of TV

Rear of TV

Getting Started

5

Connecting audio/video equipment using MONITOR OUT jacks

When using the video input jacks

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.

to antenna
output

or

MONITOR OUT

Rear of TV

When recording through the MONITOR OUT jacks

If you change the channel or video input while recording with a VCR, the channel or video input you are recording also will be changed.

to antenna socket

Audio system

Connecting optional equipment

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

Connecting video equipment using video input jacks

VIDEO IN

Rear of TV

Front of TV

VIDEO

L (MONO

)

VIDEO INPUT

AUDIO

R

VIDEO

IN

MONITOR

OUT

VIDEO

L

(

MONO

)

AUDIO

R

to video
and audio
outputs

: Signal flow

: Signal flow

to video and
audio outputs

Camcorder

to antenna
output

VCR

to antenna socket

VIDEO

IN

MONITOR

OUT

VIDEO

L

(

MONO

)

AUDIO

R

: Signal flow

to video
and audio
inputs

VCR

– 6 –

KV -T21PF1

RM-870

Getting Started

6

Presetting channels

Presetting channels manually using the
buttons on the TV

1

Press MANUAL PROGR.

2

Press PROGR +/– on the remote commander
until the required program position
appears on the screen.

3

Press TV SYSTEM until your local TV system
appears (This is not for this model).

4

Press VOLUME +/– until the required channel
picture appears on the screen.

5

Press MANUAL PROGR.

Disabling program positions using the
buttons on the TV

By disabling unused or unwanted program positions,
you can skip those positions when you press
PROGR +/– on the remote commander.

1

Press PROGR +/– on the remote commander
until the unused or unwanted program
position appears on the screen.

2

Press MANUAL PROGR.

3

Press PIC MODE on the remote commander.

4

Press MANUAL PROGR.

To cancel the skip setting

Preset the channel manually or automatically again.

You can preset up to 100 TV channels in numerical
sequence from program position 1 automatically.

To change the channel for a particular program
position or to receive a channel with a weak signal,
you can preset the channel manually. You can also
disable program position.

You can preset TV channels using the buttons on the
TV or the remote commander.

Presetting channels automatically
using the buttons on the TV

Front of TV

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

Press TV SYSTEM until your local TV system
appears

(This is not for this model).

3

Press AUTO PROGR.

To start presetting channels automatically
from the specified program position
1 Press MANUAL PROGR.
2 Press TV SYSTEM to select your local TV system

(This is not for this model).

3 Press PROGR +/– to select the program position.
4 Press AUTO PROGR.

2

3

1

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

POWER

p TV SYSTEM is not used for this model

POWER

TV SYSTEM

B/G I

D/K M

AUTO PROGR

1 2 3

1

Getting Started

7

POWER

B/G I D/K M

Presetting channels automatically
using the remote commander

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

Press SELECT until “TV SYSTEM” appears
(This is not for this model).

3

Press + or – to select your local TV system
(This is not for this model).

4

Press SELECT until “AUTO PROGRAM”
appears.

5

Press + or – .

6

Press + or – .

Presetting channels manually using the
remote commander

1

Press SELECT until “TV SYSTEM” appears
(This is not for this model).

2

Press + or – to select your local TV system
(This is not for this model).

3

Press PROGR +/– or a number button until
the required program appears on the
screen.

4

Press SELECT until “MANUAL PROGRAM”
appears.

5

Press + or – .

6

Press + or – .

The selected channel appears on the screen.

7

Press SELECT to return to normal screen.

SELECT

TV SYSTEM : B/G

SELECT

TV SYSTEM : B/G

B/G I D/K M

or

1

2

3

4

6

7

8

9

÷

0

5

PROGR

JUMP

SELECT

MANUAL PROGRAM

1 2 3

1

VHF LOW B/G

SELECT

AUTO PROGRAM

VHF LOW B/G

1

SELECT

+ or –

SELECT

– 7 –

KV -T21PF1

RM-870

9

Operations

VIDEO
HOLD

1

2

3

4

6

7

8

9

÷

0

5

JUMP

Watching the TV

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

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 pressing 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.

3

Press VOL +/– to adjust the volume.

Turning off the TV

To turn off the TV temporarily

Press POWER on the remote commander. The
STANDBY indicator on the TV lights up.

To turn off the TV completely

Press POWER on the TV.

If the power on the TV is turned off in standby mode,
the STANDBY indicator on the TV may remain alight for
a while.

Watching the video input

Press VIDEO/HOLD.

To watch TV

Press TV.

Switching back quickly to the previous
channel

Press JUMP.

Muting the sound

Press MUTING.

÷

2

5

PROGR

Operations

VIDEO

1

POWER

JUMP

POWER

VOL

POWER

MUTING

MUTING

TV

Getting Started

8

If you are not satisfied with the picture
and sound quality

You may be able to further improve the picture and
sound quality by using fine tuning as below:

1

Select the program position you want to
adjust.

2

Press SELECT until “MANUAL PROGRAM”
appears on the screen.

3

Press + or – on the remote commander
once.

4

Press DISP until “FINE” appears on the
screen.

5

Press + or – continuously until you are
satisfied with the picture and sound
quality.

6

Press SELECT to return to normal screen.

– 8 –

KV -T21PF1

RM-870

Operations

10

DISP

REVEAL

Setting the Sleep Timer

You can set the TV to automatically turn off as you
have programmed.

Press SLEEP/TEXT CLR.

To cancel the Sleep Timer, press SLEEP/TEXT CLR
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.

1

Press SELECT until the screen appears as
follows:

2

Press + or – to select “

⁄⁄⁄ ” or “ ”.

Note

• You can also use SELECT and VOLUME +/– on the TV to

select the on-screen display language.

• 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.

• 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
remote commander or the TV.

1

AUTO B/G
DYNAMIC MUSIC

Displaying on-screen information

Press DISP/REVEAL.

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

No sleep timer

After 90 minutes

After 60 minutes

After 30 minutes

SELECT

SLEEP TIMER:30M

SLEEP TIMER:60M

SLEEP TIMER:OFF

SLEEP TIMER:90M

Setting the Wake Up Timer

You can set the TV to automatically turn on as you have
programmed.

1

Press WAKE UP/INDEX repeatedly to set the
timer.

The on-screen display appears and the WAKE UP
indicator on the TV lights up.

2

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.

3

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

To cancel the Wake Up Timer, press WAKE UP/INDEX
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.

SLEEP

TEXT CLR

WAKE UP

INDEX

After 10 minutes

WAKE UP TIMER:10M

WAKE UP TIMER:OFF

WAKE UP TIMER:12H00M

No wake up timer

After 12 hours

+ or –
SELECT

LANGUAGE /

: ENGLISH

(KV-J21MF1AK/J21PF1/
T21PF1/T25MF1K)

(KV-J21MF1AK/J21PF1/
T21PF1/T25MF1K)

: LANGUAGE /

11

Operations

Using the Child Lock
feature

Watching the picture
in wide mode

You can prevent a child from watching certain program
positions by using the buttons on the remote
commander.

1

Select the TV program you want to lock.

2

Press SELECT until “CHILD LOCK” appears
on the screen.

3

Press + or – until “LOCKED” appears on the
screen.

Notes

• To unlock the program position, repeat steps 1 to 3 as above

until “LOCKED” disappears from the screen.

• To prevent your child from unlocking the program position,

keep the remote commander away from your child.

÷

0

+ or –
SELECT

SELECT

CHILD LOCK

LOCKED

You can adjust the display mode accordingly to fit the
programs to your TV screen size.

Press WIDE/V-ZOOM repeatedly until the wide
display mode you want appears on the screen.

TV

WIDE/

V-ZOOM

Good-bye,Jane
Good-bye.

Good-bye,Jane
Good-bye.

WIDE

V-ZOOM

NORMAL

Normal display
mode “WIDE” mode

“V-ZOOM” mode

– 9 –

KV -T21PF1

RM-870

Additional Information

14

Troubleshooting

Additional Information

If you have any problems, read this manual again and
check the countermeasure for each of the symptoms
listed below.
If the problem persists, 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.

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.

No picture
No sound

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

Good picture
Noisy sound

/Reduce the TREBLE level or select the

“SOFT” sound mode.

Good picture
No sound

/Press VOLUME +.
/Press MUTING.

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. TEXT.

Note on the TV SYSTEM button

• The TV SYSTEM button is not used on your TV.

Notes

• When you switch 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
POWER on the TV to switch off the TV for five minutes and
then switch it on again.

WARNING

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

Operations

12

Adjusting the
picture

Adjusting the sound and picture settings

1

Press SELECT until the item you want to
adjust appears.

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

2

Press + or – to adjust the item.

3

To adjust other items, repeat steps 1 and 2.

Notes

• You can also use SELECT and VOLUME +/– on the TV to

adjust the sound and picture settings.

• SURROUND is only applicable to a stereo signal. When

receiving a monaural signal, please turn off SURROUND for
the best sound.

If the picture color is abnormal when receiving
programs through the ˘ (antenna) terminal

Change the “TV SYSTEM” (This is not for this model

) or
“COLOR SYSTEM” setting or adjust the “COLOR” level in the on­screen display until the color becomes normal.

If the picture color 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”.

Adjusting the sound
and picture

÷

0

SOUND

MODE

SELECT
PIC MODE

Selecting the sound mode

Press SOUND MODE until the mode you want
appears.

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

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 and sound mode after the following

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

MUSIC DRAMA

SPORTS SOFT

Emphasize
low and high
sound effect

Emphasize
huge
audience
atmosphere

Emphasize
vocals and
background
music

Emphasize
soft sound

Front of TV

SOUND

MODE

High contrast
picture

DYNAMIC

STANDARD

SOFT

Normal
picture

PIC MODE

Soft picture

PICTURE

COLOR

BRIGHT

HUE

SHARPNESS

BASS

BALANCE

SURROUND

TREBLE

SELECT

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

+ or –

(Operative for
NTSC signal only)

– 10 –

KV -T21PF1

RM-870

2-1. REAR COVER REMOVAL

2-2. A BOARD REMOVAL

2-3. SERVICE POSITION

SECTION 2

DISASSEMBLY

2

Two screws

(BVTP 4×16)

3

One screw

(BVTP 3×16)

1

Two screws
(BVTP 4×16)

A board

Lever

Lever

A board