Sony KV-T25SZ8 User Manual

SERVICE MANUAL

BG-1S

CHASSIS

MODEL COMMANDER DEST . CHASSIS NO.

KV-T25SZ8

RM-870 Australia SCC-J99F-A

MODEL COMMANDER DEST. CHASSIS NO.

TRINITRON

COLOR TV

KV-T25SZ8

RM-870

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

Outputs Headphone jack: minijack

Picture tube 25 in.

Dimensions (w/h/d, mm) 613 × 542 × 472 Mass (kg) 32

SPECIFICATIONS

Note

VIDEO IN jacks: phono jacks

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

MONITOR OUT jacks: phono jacks

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

Tube size (cm) 64 Measured diagonally Screen size (cm) 60 Measured diagonally

CAUTION

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP T O 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 SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL T O 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-T25SZ8

Section Title Page Section Title Page

RM-870

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

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– 4 –

AUTO PROGR

SECTION 1

GENERAL

KV-T25SZ8

RM-870

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.

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

(

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.

– 5 –

KV-T25SZ8

RM-870

Operations

123 46 789

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 1 Press MANUAL PROGR. 2 Press PROGR +/– to select the program position. 3 Press AUTO PROGR.

Presetting channels

1 2

3 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.

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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

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

– 7 –

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

z MAIN

(Main sound)

STEREO

z SUB

(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.

KV-T25SZ8

RM-870

– 8 –

SECTION 2

Two screws (BVTP 4×16)

One screw (BVTP 3×16)

Two screws (BVTP 4×16)

Lever

A board

F1 board

A board

DISASSEMBLY

2-1. REAR COVER REMOVAL

– 9 –

2-2. A BOARD REMOVAL

2-3. F1 BOARD REMOV AL

2-4. SERVICE POSITION

KV-T25SZ8

RM-870

2-5. REPLACEMENT OF PARTS

Two screws (BVTP 3×12)

Cut

Light guide

Power button

Demagnetization coil

Tension spring

Picture tube

DGC holder

DGC band

Remove the claw

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

– 10 –

KV-T25SZ8

RM-870

2-6. DEMAGNETIZATION COIL REMOVAL

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

2-7. PICTURE TUBE REMOVAL

2 A board

5 Deflection yoke

Cushion

6 Four screws (Tapping screws)

1 Anode cap

4 C board

3 F1 board

7 VM board

Anode button

– 11 –

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.

•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.

• 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.

KV-T25SZ8

RM-870

+ 24 hidden pages

Sony KV-T25SZ8 User Manual

KV-T25SZ8

SPECIFICATIONS

TABLE OF CONTENTS

GENERAL

DISASSEMBLY