Sony TRINITRON KV-XF25M81 User manual

MODEL COMMANDER DEST. CHASSIS NO.

KV-XF25M81

RM-954 ME SCC-U16Y-A

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

COLOR TV

SERVICE MANUAL BG-3S

Self Diagnosis

Supported model

– 2 –

KV-XF25M81

RM-954

SPECIFICATIONS

Note

Power requirements 110-240V AC, 50/60 Hz

Power consumption (W) Indicated on the rear of the TV

Television system B/G, I, D/K, M

Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58

Teletext Language English, Arabic, French

Channel coverage

B/G VHF : E2 to E12 / UHF : E21 to E69

CATV : S01 to S03, S1 to S41

VHF : 0 to 12, 5A, 9A / UHF : 28 to 69 /

CATV : S01 to S03, S1 to S41

( Australia only )

VHF : 1 to 11 / UHF : 21 to 69 /

CATV : S01 to S03, S1 to S41

( New Zealand only )

IUHF : B21 to B68 / CATV : S01 to S03, S1 to S41

D/K VHF : C1 to C12, R1 to R12 / UHF : C13 to C57, R21 to R60 /

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

MVHF :A2 to A13 UHF : A14 to A79/

CATV : A-8 to A-2, A to W+4, W+6 to W+84

˘(Antenna) 75-ohm external terminal

Audio output 6W + 6W

Number of terminal

(Video) Input: 3 Output: 1 Phono jacks; 1VP-P, 75 ohms

(Audio) Input: 3 Output: 1 Phono jacks; 500 mVrms

(S Video) Input: 2 Y :1 Vp-p, 75 ohms,

unbalanced, sync

negative

C : 0.286 Vp-p, 75 ohms

2(Headphone) Output: 1 Minijack

Picture tube 25 inch

Tube size (cm) 64 Measured diagonally

Screen size (cm) 60 Measured diagonally

Dimension (w/h/d, mm) 722 ×515 ×512

Mass (kg) 38

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 TO SAFE OPERATION. REPLACE

THESE COMPONENTS WITH SONY PARTS WHOSE PART

NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

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.

– 3 –

KV-XF25M81

RM-954

TABLE OF CONTENTS

Section Title Page

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

1. GENERAL........................................................................ 8

2. DISASSEMBLY

2-1. Rear Cover Removal................................................ 23

2-2. ChassisAssy Removal............................................. 23

2-3. F Bracket Removal .................................................. 23

2-4. Service Position ....................................................... 24

2-5. Replacement of Parts ............................................... 24

2-5-1. Replacement of Control Button ....................... 24

2-5-2. Replacement of Light Guide ............................ 24

2-6. Terminal Bracket Removal ...................................... 24

2-7. V1 Board Removal .................................................. 24

2-8. H3 Board Removal .................................................. 25

2-9. A and B3 Boards Removal ...................................... 25

2-10. Picture Tube Removal.............................................. 25

3. SET-UP ADJUSTMENTS

3-1. Beam Landing.......................................................... 27

3-2. Convergence............................................................. 28

3-3. Focus Adjustment .................................................... 30

3-4. G2 (Screen) and White Balance Adjustments......... 31

4. CIRCUIT ADJUSTMENT

4-1. Adjustments with Commander................................ 32

4-2. Adjustment Method ................................................. 33

4-3. Picture Quality Adjustments.................................... 38

4-4. A Board Adjustment After IC003 (Memory)

Replacement............................................................. 38

4-5. Picture Distortion Adjustment ................................. 39

Section Title Page

5. DIAGRAMS

5-1. Block Diagram ......................................................... 41

5-2. Frame Schematic Diagram ...................................... 44

5-3 Circuit Boards Location .......................................... 47

5-4. Schematic Diagrams and Printed Wiring Boards ... 48

(1) Schematic Diagram of A (1/2) Board...................... 51

(2) Schematic Diagrams of A (2/2), B2 and F Boards . 55

(3) Schematic Diagram of C Board .............................. 61

(4) Schematic Diagrams of H3,V1 and VM1 Boards .. 67

(5) Schematic Diagram of B3 Board ............................ 70

5-5. Semiconductors........................................................ 75

6. EXPLODED VIEWS

6-1. Speaker Bracket ....................................................... 78

6-2. Chassis ..................................................................... 79

6-3. Picture Tube ............................................................. 80

7. ELECTRICAL PARTS LIST ...................................... 81

– 4 –

KV-XF25M81

RM-954

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automatically

begin to flash.

The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER

lamp flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot

be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past

problems and how often these problems occur.

1. DIAGNOSTIC TEST INDICATORS

When an errors occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the

problem. If there is more than one error, the lamp will identify the first of the problem areas.

Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.

Diagnostic

Item

Description

• Power does not

turn on

• +B overcurrent

(OCP) or

overvoltage

(OVP)

• Vertical deflection

stopped

• Horizontal

deflection

overdrive

• White balance

failure (no

PICTURE)

• Micro reset

Detected

Symptoms

• Power does not come on.

• No power is supplied to the

TV.

• AC power supply is faulty.

• Power does not come on.

• Load on power line is

shorted.

• Has entered standby state

after horizontal raster.

• Vertical deflection pulse is

stopped.

• Power line is shorted or

power supply is stopped.

• No raster is generated.

• CRT cathode current

detection reference pulse

output is small.

• Power is shut down shortly,

after this return back to

normal.

• Detect Micro latch up.

Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.

The symptom that is diagnosed first by the microcontroller is displayed on the screen.

Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.

SELF DIAGNOSTIC FUNCTION

No. of times

STANDBY/TIMER

lamp flashes

Does not light

2 times

5 times

—

Self-diagnostic

display/Diagnostic

result

—

002:000 or

002:001~255

003:001~255

004:001~255

at the same time

005:000 or

005:001~225

101:00 or

101:001~225

Probable

Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out F4601

(F)

• H.OUT Q511 is shorted. (A

board)

• IC701 is shorted. (C board)

• -13V is not supplied. (A

board)

• IC 503 faulty (A board)

• G2 is improperly adjusted.

(Note 2)

• CRT problem.

• Video OUT IC701 is faulty.

(C board)

• IC301 is faulty. (A board)

• No connection A board to C

board.

• Discharge CRT (C Board)

• Static discharge

• External noise

– 5 –

KV-XF25M81

RM-954

2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

Diagnostic Item Flash Count*

+B overcurrent/overvoltage 2 times

Vertical deflection stopped

White balance failure 5 times

* One flash count is not used for self-diagnostic.

3. STOPPING THE STANDBY/TIMER FLASH

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp

from flashing.

Lamp ON 0.3 sec. Lamp OFF 3 sec.

Lamp OFF 0.3 sec.

2 times

5 times

STANDBY/SLEEP lamp

– 6 –

KV-XF25M81

RM-954

4. SELF-DIAGNOSTIC SCREEN DISPLAY

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it

is possible to bring up past occurances of failure for confirmation on the screen:

[To Bring Up ScreenTest]

In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

[Screendisplay] /channel [5] /Sound volume [-] /Power ON

Note that this differs from entering the service mode (mode volume [+]).

Self-Diagnosis screen display

5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen

during repairs. When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after

completion of the repairs.

[Clearing the result display]

To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnostic

screen is being displayed.

Channel [8] /0

[Quitting Self-diagnostic screen]

To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.

002 : 000

003 : 000

004 : 000

005 : 001

Numeral "0" means that no fault has been detected.

Numeral "1" means a fault has been detected.

101 : 000

SELF DIAGNOSTIC

– 7 –

KV-XF25M81

RM-954

6. SELF-DIAGNOSTIC CIRCUIT

[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON

and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven

verticals in a period, the unit will automatically turn off.

[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001

shut down the power supply.

[Verticaldeflectionovercurrent] Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be

shut down when detect this by IC001.

[Whitebalancefailure] If the RGB levels* do not balance or become low level within 5 seconds, this error will be

detected by IC301. TV will stay on, but there will be no picture.

* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)

IC301

Y/CHROMA JUNGLE

FROM

CRT

FROM

[+B] Q604 C

[V] Q509/507

IC001

SYSTEM IC003

MEMORY

B-DAT

IO-SDAT

IK-IN

MP/

PROTECT

IO-8DAT

O-LED

SDA

54521

18 51

4635

– 8 –

KV-XF25M81

RM-954

SECTION 1

GENERAL

The operating instructions mentioned here are partial abstracts

from the Operating Instruction Manual. The page numbers of

the Operating Instruction Manual remain as in the manual.

WARNING

• Dangerously high voltages are present inside the TV.

• Operate the TV only between 110 – 240 V AC.

To prevent fire or shock hazard, do not expose

the TV to rain or moisture.

Do not operate the TV if any liquid or solid object

falls into it. Have it checked immediately by

qualified personnel only.

Do not open the cabinet and the rear cover of the

TV. Refer servicing to qualified personnel.

Do not install the TV in hot, humid or excessively

dusty places.

Do not install the TV in a confined space, such

as a bookcase or built-in cabinet.

Do not block the ventilation openings of the TV.

Do not pull the power cord to disconnect the TV.

Pull it out by the plug.

Disconnect the power cord during lightning

storms or if you are not going to use the TV for

several days.

Install the TV in a stable position. Do not allow

children to climb onto it.

Do not plug in too many appliances to the same

power socket. Do not damage the power cord.

Clean the TV with a dry and soft cloth.

Do not use benzine, thinner, or any other chemicals

to clean the TV. Do not scratch the picture tube.

Using Your New TV

VIDEO

VIDEO IN

VIDEO OUT

AUDIO

WOOFER

(8Ω)

Getting Started

Step 1

Connect the antenna

If you wish to connect a VCR, see the “Connecting a VCR” diagram below.

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.

Connecting a VCR

To watch the video, press …(see page 10).

Using Your New TV

IEC connector

(not supplied)

To video and

audio outputs

VCR

(yellow)

-L (MONO) (white)

-R (red)

To S video

output

Antenna cable (not supplied)

To …1 or 2

(video input)

Audio/Video cable

(not supplied)

S video cable

(not supplied)

: Signal flow

(S video input)

To antenna

output

To ˘

(antenna)

: Signal flow

Antenna cable (not supplied)

Rear of TV

– 9 –

KV-XF25M81

RM-954

Using Your New TV

AUTO PROGRAM

PR : 0 1

AUTO

PROGR

ONE-PUSH AUTOMATIC PROGRAMMING

ONE-PUSHAUTOMATICPROGRAMMING

TV S YS : AUTO

VHF LOW

PROGR

Notes

• If you connect a monaural VCR, connect the yellow plug to (the yellow

jack) and the black plug to -L (MONO) (the white jack).

• If you connect a VCR to the ˘(antenna) terminal, preset the signal

output from the VCR to the program number 0 on the TV.

• If both (S video input) and …1 (video input) at the rear of your TV

are input at the same time, the (S video input) is automatically

selected. To view …1 (video input), disconnect the S video cable.

• When no signal is input to the connected video equipment, the TV screen

becomes blue.

Step 2

Insert the batteries

into the remote

Note

• Do not use old batteries nor use different types of batteries together.

Step 3

Preset the channels automatically

Tips

• If you want to stop the automatic channel presetting, press MENU twice.

• If your TV has preset an unwanted channel or cannot preset a particular

channel, then preset your TV manually (see page 26 and 27).

Now You Are Ready. . .

To preset the channels manually, see

page 26 and 27.

Front of TV

Using Your New TV

WOOFER

(8 )

(MONO)

Connecting optional components

You can connect optional audio/video components, such as a VCR, multi disc player,

camcorder, video game or stereo system.

To watch the picture of the connected equipment, press …(see page 10).

Connecting a camcorder/video game equipment

using the …(video input) jacks

Notes

• You can also connect video equipment to the …1 or 2 (video input) jacks

at the rear of your TV.

• If both (S video input) and …3 (video input) at the front of your TV

are input at the same time, the (S video input) is automatically

selected. To view …3 (video input), disconnect the S video cable.

Connecting audio/video equipment using the Ú

(monitor output) jacks

Note

• When connecting a monaural VCR, connect the yellow plug to (the

yellow jack) and the black plug to -L (MONO) (the white jack).

To S video output

Front of TV

Camcorder

Video game

equipment

To video and

audio outputs

(yellow)

-L (MONO)

(white)

-R (red)

Rear of TV

antenna

output

To video and

audio inputs

Audio system

audio

inputs

VCR

:Signal flow

(S video

input)

…

(video input)

To Ú

(monitor

output)

Audio/Video cable (not supplied)

S video cable (not supplied)

Antenna cable (not supplied)

Audio/Video cable

(not supplied)

– 10 –

KV-XF25M81

RM-954

Using Your New TV

Watching the TV

This section explains functions used

while watching TV. Most operations can

be done using the remote.

Press Uto turn on the TV.

When the TV is in the

standby mode (the u

indicator on the TV is lit

red), press uon the remote

or PROGR +/– on the TV.

Press PROGR +/– or

number buttons to select

the TV program.

For double digit numbers,

press ÷, then the number

(e.g., for 25, press ÷, then

2 and 5).

Press

.+/– to adjust the

volume.

…

;

Number buttons

JUMP

.+/–

PROGR +/–

continued

123

456

-/--

FAVORITE

SOUND

MODE

PIC MODE

ENTER

A/B

SURROUND

+/–/ENTER

indicator

Using Your New TV

3.8mm

Securing the TV

To prevent the TV from falling, secure the TV using one of the following methods:

With the supplied screws, attach the band to the TV stand and to the rear of

the TV using the provided hole.

Put the cord or chain through the clamps to secure the TV against a wall or

pillar.

Note

• Use only the supplied screws. Use of other screws may damage the TV.

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