Sony TRINITRON KV-AR25M81A User manual

REVISION HISTORY BG3R

MODEL

KV-AR25M81A

PA RT N O. : 9-872-347-01

NO. SUFFIX DATE SUPP / CORR DESCRIPTION

CHASSIS

1 -01 2002/11 -- 1st. Issue

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

COLOR TV

SERVICE MANUAL BG3R

MODEL COMMANDER DEST. CHASSIS NO.

KV-AR25M81A RM-952 Pakistan

–2 –

KV-AR25M81A

RM-952

Power requirements 110-240 V 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, NTSC3.58, NTSC4.43

Teletext language English, Arabic, French

Channel coverage

B/G VHF: E2 to E12

UHF: E21 to E69

CATV: S01 to S03, S1 to S41

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 (Speaker) 5W + 5W

Number of terminal

DVideo Input: 3* Output: 1 Phono jacks; 1 Vp-p, 75 ohms * Two input lines available

≥Audio Input: 3* Output: 1 Phono jacks; 500 mVrms * Two input lines available

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

unbalanced, sync negative

C: 0.286 Vp-p, 75 ohms

(Component Input : 1 Phono jacks:

Video) Y: 1 Vp-p, 75 ohms,

sync negative

CB: 0.7 Vp-p, 75 ohms

CR: 0.7 Vp-p, 75 ohms

Audio: 500mVrms

2(Headphone) Output: 1 Stereo minijack

Picture tube 25 in.

Tube size (cm) 64 Measured diagonally

Screen size (cm) 60 Measured diagonally

Dimension (w/h/d,mm) 650 ×517 ×496

Mass (kg) 39

Design and specifications are subject to change without notice.

SPECIFICATIONS

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK !ON

THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND INTHE

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.

Note

–3 –

KV-AR25M81A

RM-952

TABLE OF CONTENTS

SELF DIAGNOSTIC FUNCTION ........................................4

1. DISASSEMBLY

1-1. Rear Cover Removal ................................................... 7

1-2. Speaker Block Assy Removal ..................................... 7

1-3. Chassis Assy Removal ................................................ 7

1-4. Service Position .......................................................... 7

1-5. Terminal Bracket and J Board Removal .................... 7

1-6. V1 Board Removal ..................................................... 7

1-7. H1 and H2 Boards Removal ....................................... 8

1-8. A and B9 Boards Removal ......................................... 8

1-9. Picture Tube Removal ................................................. 8

2. SET-UP ADJUSTMENTS

2-1. Beam Landing ........................................................... 10

2-2. Convergence .............................................................. 11

2-3. Focus Adjustment ..................................................... 13

2-4. G2 (SCREEN) and White Balance Adjustment ....... 14

3. CIRCUIT ADJUSTMENTS

3-1. Adjustment With Commander .................................. 15

3-2. Adjustment Method .................................................. 15

3-3. Picture Quality Adjustments ..................................... 21

3-4. Deflection Adjustments ............................................ 21

3-5. H-Trapezoid Adjustment .......................................... 22

3-6. A Board Adjustment After IC003 (MEMORY)

Replacement .............................................................. 22

3-7. Picture Distortion Adjustment .................................. 23

Section Title Page Section Title Page

4. DIAGRAMS

4-1. Block Diagram .......................................................... 24

4-2. Circuit Board Location ............................................. 26

4-3. Schematic Diagram ................................................... 27

(1) A Board Schematic Diagram .............................. 28

(2) B9 Board Schematic Diagram ............................ 32

(3) V1 Board Schematic Diagram ............................ 34

(4) C6 Board Schematic Diagram ............................ 36

(5) H1 Board Schematic Diagram ............................ 38

(6) H2 Board Schematic Diagram ............................ 40

(7) J Board Schematic Diagram ............................... 41

(8) VM1 Board Schematic Diagram ........................ 42

4-4. Voltage List and Waveforms ..................................... 43

4-5. Printed Wiring Boards and Parts Location ............... 47

4-6. Semiconductors ......................................................... 52

5. EXPLODED VIEWS

5-1. Speaker Block ........................................................... 54

5-2. Chassis ...................................................................... 55

5-3. Picture Tube .............................................................. 56

6. ELECTRICAL PARTS LIST......................................... 57

INSTRUCTION MANUAL

–4 –

KV-AR25M81A

RM-952

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”.

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 2-4 of this manual.

* R(Q703), G(Q702) or B(Q701) out is faulty (C6 board).

SELF DIAGNOSTIC FUNCTION

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.

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)

•Q701, Q702, Q703 is

shorted (C6 board)

•-13V is not supplied.

(A board)

•IC 503 faulty (A board)

•G2 is improperly adjusted.

(Note 2)

•CRT problem.

•R(Q703), G(Q702) or

B(Q701) out is faulty

(C6 board)

•IC301 is faulty. (A board)

•No connection A board to

C6 board.

•Discharge CRT (C6 Board)

•Static discharge

•External noise

–5 –

KV-AR25M81A

RM-952

2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

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.

4. SELF-DIAGNOSTIC SCREEN DIPLAY

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 Screen Test]

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

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.

2 times

5 times

Lamp ON 0.3 sec.

Lamp OFF 0.3 sec. Lamp OFF 3 sec.

002 : 000

003 : 000

004 : 000

005 : 001

101 : 000

SELF DIAGNOSTIC

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

Numeral "1" means a fault has been detected.

STANDBY/SLEEP lamp

–6 –

KV-AR25M81A

RM-952

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.

6. SELF-DIANOSTIC 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.

[ hite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

[V] Q509/507

IC001

SYSTEM

IC003

MEMORY

IK-IN

MP/

PROTECT O-LED

IO-8DAT B-DAT

IO-SDAT

521

18 51

SDA 35

FROM

[+B] Q604 C6

–7 –

KV-AR25M81A

RM-952

SECTION 1

DISASSEMBLY

1-1. REAR COVER REMOVAL 1-2. SPEAKER BLOCK ASSY REMOVAL

1-3. CHASSIS ASSY REMOVAL

1Nine screws

(+BVTP 4 × 16)

2Rear cover

1Four screws

(Washer head)

(+P 4×16 )

2Speaker Block Assy

1-4. SERVICE POSITION

1-6. V1 BOARD REMOVAL

1-5. TERMINAL BRACKET AND J BOARD

REMOVAL

3J Board

4Two screw

(+BVTP 3 × 12)

5Terminal bracket

2Two screws

(+BVTP 3 × 12)

1One screw

(+BVTP 4 × 16)

6Two Hooks

2V1 Board

1Two claws

–8 –

KV-AR25M81A

RM-952

1-9. PICTURE TUBE REMOVAL

Note:

•Please make sure the TV set is not in standing position before removing necessary CRT support located on bottom

right and left.

1) Place the TV set with the CRT face down on a cushion jig.

2) Removal the rear cover.

3) Removal the Speaker Block Assy.

1-8. A AND B9 BOARDS REMOVAL1-7. H1 AND H2 BOARDS REMOVAL

5Cover, H

6H2 Board

4Two hooks

3Four hooks

3H1 Board

1Two screws

(Washer head)

(+BVTP 3 x 12)

5A Board

4B9 Board

1One screw

(Washer head)

(+BVTAP 3 x 12)

2One screw

(Washer head)

(+BVTAP 3 x 12)

3Two screws

(Washer head)

(+BVTAP 3 x 12)

!∞ Nut, locking

!¡ Holder, DGC(2)

Removal

q; Spring Tension(2)

Removal

8Loosen the Neck Assembly

fixing screw and removal

7VM1 Board Removal

9Chassis Assy Removal

5C6 Board Removal

6Loosen the Neck Assembly

fixing screw and removal

qs Degaussing Coil

!£ Band, DGC Removal

4Anode Cap Removal

qf Earth Coating Assy

–9 –

KV-AR25M81A

RM-952

• REMOVAL OF ANODE-CAP

Note:

•After removing the anode, short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT

shield or carbon paint on the CRT.

•REMOVING PROCEDURES

1Turn up one side of the rubber cap in the direction

indicated by the arrow a.

2Using a thumb pull up the rubber cap firmly in the direc-

tion indicated by the arrow b.

3When 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

1Do not damage the surface of anode-caps with

sharp shaped objects.

2Do not press the rubber too hard so as not to

damage the inside of anode-cap.

A metal fitting called the shatter-hook terminal is

built into the rubber.

3Do not turn the foot of rubber over too hard.

The shatter-hook terminal will stick out or damage

the rubber.

anode button

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