Sony TRINITRON KV-T25SZ8 Manual de usuario

MODEL COMMANDER DEST. CHASSIS NO.

KV-T25SZ8

RM-870 Australia SCC-J99F-A

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO.

TRINITRON

COLOR TV

BG-1S

CHASSIS

– 2 –

KV-T25SZ8

RM-870

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)

Stereo system A2 Stereo (German) B/G

Channel coverage VHF: 0 to 12, 5A, 9A / UHF: 28 to 69 / CATV: S01 to S03, S1 to S41

Audio output (speaker) 5W ×2

Inputs Antenna: 75 ohms

VIDEO IN jacks: phono jacks

Video: 1 Vp-p, 75 ohms

Audio: 500 mVrms, high impedance

Outputs Headphone jack: minijack

MONITOR OUT jacks: phono jacks

Video: 1 Vp-p, 75 ohms

Audio: 500 mVrms

Picture tube 25 in.

Tube size (cm) 64 Measured diagonally

Screen size (cm) 60 Measured diagonally

Dimensions (w/h/d, mm) 613 ×542 ×472

Mass (kg) 32

Design and specifications are subject to change without notice.

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 VIEWSAND IN THE

PARTS LIST ARE CRITICALTO SAFE OPERATION. REPLACE

THESE COMPONENTS WITH SONY PARTS WHOSE PART

NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

– 3 –

KV-T25SZ8

RM-870

TABLE OF CONTENTS

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

2. DISASSEMBLY

2-1. Rear Cover Removal............................................ 9

2-2. A Board Removal ................................................ 9

2-3. F1 Board Removal ............................................... 9

2-4. Service Position ................................................... 9

2-5. Replacement of Parts ........................................... 10

2-6. Demagnetization Coil Removal .......................... 10

2-7. Picture Tube Removal.......................................... 11

3. SET-UP ADJUSTMENTS

3-1. Beam Landing ...................................................... 12

3-2. Convergence......................................................... 13

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

3-4. G2 (Screen) and White Balance Adjustments ..... 15

4. SELF DIAGNOSIS FUNCTION............................. 16

5. CIRCUIT ADJUSTMENTS

5-1. Adjustments with Commander ............................ 17

5-2. Adjustment Method ............................................. 18

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

Replacement......................................................... 21

5-4. Picture Distortion Adjustment ............................. 21

6. DIAGRAMS

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

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

6-3. Schematic Diagrams and Printed Wiring Boards. 27

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

(2) Schematic Diagrams of A3, F1, C and

VM Boards............................................................ 35

6-4. Semiconductors..................................................... 43

7. EXPLODED VIEW

7-1. Chassis .................................................................. 45

8. ELECTRICAL PARTS LIST.................................... 47

Section Title Page Section Title Page

– 4 –

KV-T25SZ8

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 this manual.

AUTO PROGR

– 5 –

KV-T25SZ8

RM-870

Getting Started

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.

Rear of TV

On a wall

Rear of TV

Getting Started

to video

and audio

outputs

to antenna socket

to antenna

output VCR

VIDEO IN

: Signal flow

Rear of TV

VIDEO

MONITOR

OUT

VIDEO

(MONO)

AUDIO

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

When connecting a monaural VCR

Connect the yellow plug to VIDEO and the black

plug to AUDIO-L (MONO).

Getting Started

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.

to video and

audio outputs

to antenna

socket

MONITOR OUT

Rear of TV

to antenna

output

to video

and audio

inputs

: Signal flow

VCR

Audio system

VIDEO

MONITOR

OUT

VIDEO

(MONO)

AUDIO

Connecting audio/video equipment using MONITOR OUT jacks

VIDEO L (MONO)

VIDEO INPUT

AUDIO

: Signal flow

Camcorder

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.

CAUTION

Do not connect the power cord until you have completed making all other connections; otherwise a minimum leakage

current might flow through the antenna and other terminals to ground.

– 6 –

KV-T25SZ8

RM-870

Operations

123

789

÷0

Watching the TV

Switching off the TV

To switch off the TV temporarily, press POWER on the

remote commander.

To switch off the TV completely, press POWER on the

TV.

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

the STANDBY indicator may remain alight for a while.

Watching the video input

Press VIDEO/HOLD.

Press POWER to turn the TV on.

To scan through channels

Press PROGR +/– until the channel you want

appears.

Press VOL +/– to adjust the volume.

When the TV is in standby mode after pressing

POWER, press POWER on the remote commander.

Select the TV channel you want to watch.

To select a channel directly

Press a number button.

To select a two-digit channel, press “-/--” before

the number buttons.

For example: to select channel 25, press “-/- -,” and

then “2” and “5.”

POWER

Operations

HOLD

VIDEO

VIDEO 1

POWER

÷2 5

VOL

PROGR

POWER

To watch TV, press TV.

Muting the sound

Press MUTING.

MUTING

Getting Started

MANUAL PROGR

COLOR SYSTEM SELECT

TV SYSTEM

AUTO PROGR

POWER

Presetting channels

Presetting channels automatically

You can preset up to 80 TV channels in numerical

sequence from program position 1.

Front of TV

Note

•TV SYSTEM button is not used for this model.

Press POWER.

When the TV is in standby mode after pressing

POWER, press POWER on the remote commander.

Press AUTO PROGR.

To start presetting channels automatically

from the specified program position

1Press MANUAL PROGR.

2Press PROGR +/– to select the program position.

3Press AUTO PROGR.

Presetting channels

123 1

AUTO PROGR

POWER

Presetting channels manually

To change the channel for a particular program

position or to receive a channel with a weak signal,

preset the channel manually.

Press MANUAL PROGR.

Press PROGR +/– until the required program

position appears on the screen.

Press VOLUME +/– on the TV until the

required channel picture appears on the

screen.

Press MANUAL PROGR.

Disabling program positions

By disabling unused or unwanted program positions,

you can skip those positions when you press PROGR

+/–.

Press PROGR +/– until the unused or

unwanted program position appears on the

screen.

Press MANUAL PROGR.

Press PIC MODE on the remote commander.

Press MANUAL PROGR.

To cancel the skip setting

Preset the channel manually or automatically again.

– 7 –

KV-T25SZ8

RM-870

Operations

INDEX

WAKE UP

AUTO B/G

STANDARD

REVEAL

DISPLAY

Displaying on-screen information

Press DISPLAY/REVEAL.

The program position, local system, and TV settings are

displayed on the screen.

•The last TV program position or video mode 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. When 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

Setting the Wake Up Timer

You can set the TV to turn on automatically after the

period of time you want.

Press WAKE UP/INDEX repeatedly to set the

timer.

The on-screen display appears and the WAKE UP

indicator 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

mode.

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 TIMER:30M SLEEP TIMER:60M

SLEEP TIMER:OFF SLEEP TIMER:90M

WAKE UP TIMER:10M

WAKE UP TIMER:OFF WAKE UP TIMER:12H00M

After 10 minutes

No wake up timer After 12 hours

Setting the Sleep Timer

You can set the TV to turn off automatically after the

period of time you want.

Press SLEEP.

To cancel the Sleep Timer, press SLEEP repeatedly

until “SLEEP TIMER: OFF” appears, or turn the TV off.

Changing the on-screen display

language

If you prefer Chinese to English, you can change the

on-screen display language. You can use buttons on the

remote commander or the TV.

Press SELECT until the screen appears as

follows:

Press + or – to select “⁄⁄⁄ ”.

Note

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

on-screen display language.

+ or -

SELECT

LANGUAGE : ENGLISH

LANGUAGE /»y¤¥

: ENGLISH

LANGUAGE :

»y¤¥

/ LANGUAGE : ⁄⁄⁄

Operations

Each time you press SELECT, the screen changes as

follows:

Press + or – to adjust the item.

To adjust other items, repeat steps 1 and 2.

Note

•You can also use VOLUME +/– on the TV to adjust the picture

and sound settings.

If the color of the picture is abnormal

Press COLOR SYSTEM or adjust the color setting until

the color becomes normal.

Note

•Normally set COLOR SYSTEM to AUTO.

Front of TV

Note

•TV SYSTEM button is not used for this model.

+ or –

SELECT

PIC MODE

DYNAMIC STANDARDSOFT

High contrast

picture

SELECT

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 and sound

settings

Press SELECT until the item you want to

adjust appears.

Soft picture

(good for

video games)

(Operative for

NTSC signal only)

PICTURE COLOR BRIGHT

HUE

SHARPNESS

BASS

BALANCE TREBLE

SURROUND

TILT CORRECTION

Adjusting the picture

and sound

MANUAL PROGR

COLOR SYSTEM SELECT

TV SYSTEM

AUTO PROGR

– 8 –

KV-T25SZ8

RM-870

Additional Information

Troubleshooting

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.

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.

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.

/Press A/B/ENLARGE

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.

WARNING

Do not install the appliance in a confined space, such as

a bookcase or built-in cabinet.

Additional Information

Operations

Press A/B/ENLARGE repeatedly until you

receive the sound you want.

The on-screen display changes corresponding to the

selected sound and the WAKE UP/STEREO indicator

also lights up.

When receiving a A2 (German) program

Broadcasting

A2 (German) stereo

A2 (German) bilingual

Selecting a stereo or

bilingual program

ENLARGE

A/B

On-screen display

(Selected sound)

STEREO

(Stereo sound)

STEREO

zMAIN

(Main sound)

STEREO

zSUB

(Sub sound)

Receiving area for A2 (German) program

System

A2 (German)

Note

•If the signal is very weak, the sound becomes monaural

automatically.

Receiving area

Australia, Malaysia, Thailand, etc.

– 9 –

KV-T25SZ8

RM-870

2-1. REAR COVER REMOVAL 2-3. F1 BOARD REMOVAL

SECTION 2

DISASSEMBLY

2-2. A BOARD REMOVAL 2-4. SERVICE POSITION

2Two screws

(BVTP 4×16)

3One screw

(BVTP 3×16)

1Two screws

(BVTP 4×16)

Lever

A board

F1 board

A board

– 10 –

KV-T25SZ8

RM-870

2-5. REPLACEMENT OF PARTS

For replacement of the Multi Button, Power Button and Light Guide, cut the welded portions

from them, exchange with the new parts, and fix them with screws (+BVTP) respectively.

2-5-1. REPLACEMENT OF MULTI BUTTON

2-5-2. REPLACEMENT OF POWER BUTTON AND LIGHT GUIDE

2-6. DEMAGNETIZATION COIL REMOVAL

Two screws

(BVTP 3×12)

Two screws

(BVTP 3×12)

Cut

Light guide

Power button

3Demagnetization coil

4Tension spring

Picture tube

2DGC holder

1DGC band

Remove the claw

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