Sony KV-G14K3, KV-G21K3 Service Manual

MODEL COMMANDER DEST. CHASSIS NO.

KV-G14K3

RM-870 Vietnam SCC-K26L-A

KV-G21K3

RM-870 Vietnam SCC-K26M-A

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO.

TRINITRON

®

COLOR TV

RM-870 KV-G14K3 KV-G21K3

CHASSIS

BG-1S (D)

– 2 –

KV -G14K3/G21K3

RM-870

SPECIFICATIONS

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 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.

Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, D/K
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
D/K VHF: C1 to C2, R1 to R/12/UHF: C13 to C57, R21 to R/60/

CATV: S01 to S03, S1 to S41, Z1 to Z39

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

VIDEO IN jacks: phono jacks

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

Outputs Earphone jack: mini jack

MONITOR OUT jacks: phono jacks

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

Picture tube 14 in. 21 in.

Tube size (cm) 37 54 Measured diagonally
Screen size (cm) 34 51 Measured diagonally

Dimensions (w/h/d, mm) 369 × 347 × 403 527 × 464 × 471
Mass (kg) 11 22

KV-G14K3 KV-G21K3

Design and specifications are subject to change without notice.

– 3 –

KV-G14K3/G21K3

RM-870

TABLE OF CONTENTS

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 ........................................... 10

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 Adjustments..... 17

4. SELF DIAGNOSIS FUNCTION ...................... 18

5. CIRCUIT ADJUSTMENTS

5-1. Adjustments with Commander ............................ 19

5-2. Adjustment Method ............................................. 20

5-3. A Board Adjustment after IC003 (Memory)

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

5-4. Picture Distortion Adjustment ............................. 23

6. DIAGRAMS

6-1. Block Diagrams .................................................... 25

6-2. Circuit Boards Location ....................................... 27

6-3. Schematic Diagrams and Printed Wiring Boards

(1) Schematic Diagram of A Board............................ 31

(2) Schematic Diagrams of A11 and C Boards .......... 35

6-4. Semiconductors..................................................... 39

7. EXPLODED VIEWS

7-1. Chassis (KV-G14K3)............................................ 41

7-2. Chassis (KV-G21K3)............................................ 42

8. ELECTRICAL PARTS LIST............................. 43

Section Title Page Section Title Page

– 4 –

KV-G14K3/G21K3

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

– 5 –

KV -G14K3/G21K3

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

or

On a wall

Rear of TV

Rear of TV

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

VIDEO

IN

MONITOR

OUT

VIDEO

AUDIO

to video
and audio
outputs

: Signal flow

to antenna
output

VCR

to antenna socket

Getting Started

5

Connecting audio/video equipment using MONITOR OUT jacks

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

VIDEO

VIDEO INPUT

AUDIO

: Signal flow

to video and
audio outputs

Camcorder

VIDEO

IN

MONITOR

OUT

VIDEO

AUDIO

: Signal flow

to video
and audio
inputs

VCR

Front of TV

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.

– 6 –

KV-G14K3/G21K3

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

4

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 AUTO PROGR.

To start presetting channels automatically
from the specified program position
1 Press MANUAL PROGR.
2 Press PROGR +/– to select the program position.
3 Press AUTO PROGR.

POWER

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

POWER

1

2

AUTO PROGR

1 2 3

1

Getting Started

7

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 “AUTO PROGRAM”
appears.

3

Press + or – .

4

Press + or – .

Presetting channels manually using the

remote commander

1

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

+ or –

SELECT

POWER

SELECT

AUTO PROGRAM

VHF LOW B/G

1

2 3

1

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.

or

1

2

3

4

6

7

8

9

÷

0

5

PROGR

JUMP

2

Press SELECT until “MANUAL PROGRAM”
appears.

3

Press + or – .

4

Press + or – .

The selected channel appears on the screen.

5

Press SELECT to return to normal screen.

VHF LOW B/G

SELECT

MANUAL PROGRAM

1

SELECT

– 7 –

KV -G14K3/G21K3

RM-870

9

Operations

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 “ ”.

Note

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

select the on-screen display language.

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.

• 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

Displaying on-screen information

Press DISP/REVEAL.

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

After 10 minutes

WAKE UP TIMER:10M

WAKE UP TIMER:OFF

WAKE UP TIMER:12H00M

No wake up timer

After 12 hours

SLEEP TIMER:30M

SLEEP TIMER:60M

SLEEP TIMER:OFF

SLEEP TIMER:90M

No sleep timer

After 90 minutes

After 60 minutes

After 30 minutes

WAKE UP

INDEX

SLEEP

TEXT CLR

+ or –
SELECT

SELECT

LANGUAGE /

: ENGLISH

: LANGUAGE /

Operations

8

VIDEO
HOLD

POWER

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

POWER

JUMP

VOL

TV

MUTING

MUTING

– 8 –

KV-G14K3/G21K3

RM-870

Operations

10

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

11

Operations

Adjusting the
picture

Adjusting the picture

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.

÷

0

SOUND
MODE

SELECT
PIC MODE

+ or –

High contrast
picture

DYNAMIC

STANDARD

SOFT

Normal
picture

Soft picture

PIC MODE

Adjusting the picture setting

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.

Note

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

adjust the picture setting.

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

Change the

“COLOR SYSTEM” setting or adjust the “COLOR” level

in the on-screen 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”.

SELECT

PICTURE

COLOR

BRIGHT

HUE

SHARPNESS

(Operative for
NTSC signal only)

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

Front of TV

– 9 –

KV -G14K3/G21K3

RM-870

Additional Information

12

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 color

/Adjust the COLOR level in the on-screen

display.

/Check the COLOR SYSTEM setting.

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
No sound

/Press VOLUME +.
/Press MUTING.

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.

– 10 –

KV-G14K3/G21K3

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 3×12: KV-G14K3)
(BVTP 3×16: KV-G21K3)

1

Two screws

(BVTP 4×16)

2-4. REPLACEMENT OF PARTS

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

2-4-1. REPLACEMENT OF CONTROL BUTTON/MULTI BUTTON

(1) For KV-G14K3

A board

Cut

Control button

Lever

Lever

A board

Control button

Two screws
(BVTP 3×12)

– 11 –

KV -G14K3/G21K3

RM-870

(2) For KV-G21K3

2-5. DEMAGNETIZATION COIL REMOVAL

(1) For KV-G14K3

(2) For KV-G21K3

2

Demagnetization coil

1

Tension spring

Picture tube

3

3

DGC holder

DGC holder

1

Demagnetization coil

2

Tension spring

Picture tube

2-4-2. REPLACEMENT OF LIGHT GUIDE, POWER BUTTON

(1) For KV-G14K3

Power button

Two screws
(BVTP 3×12)

Light guide

Power button

Cut

Cut

(2) For KV-G21K3

Cut

Light guide

Power button

Two screws
(BVTP 3×10)

Two screws
(BVTP 3×10)

– 12 –

KV-G14K3/G21K3

RM-870

2-6. PICTURE TUBE REMOVAL

(1) For KV-G14K3

2 A board

3 C board

4 Deflection yoke

Cushion

5 Four screws
(Tapping screws)

1 Anode cap

(2) For KV-G21K3

2 A board

3 C board

4 Deflection yoke

Cushion

5 Four screws
(Tapping screws)

1 Anode cap

a

a

b

b

2 Using a thumb pull up the rubber

cap firmly in the direction indicated
by the arrow b.

1 Turn up one side of the rubber cap

in the direction indicated by the
arrow a.

c

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 it up in the direction of the
arrow c.

• HOW TO HANDLE AN ANODE-CAP

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

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.