SONY KV-J25MF8J Service Manual

SERVICE MANUAL

BG-1L

CHASSIS

MODEL COMMANDER DEST. CHASSIS NO.

KV-J25MF8J

RM-873 ME SCC-K57P-A

MODEL COMMANDER DEST. CHASSIS NO.

KV-J29MF8J

RM-873 ME SCC-K57N-A

TRINITRON

COLOR TV

SPECIFICATIONS

KV-J25MF8J KV-J29MF8J

Note

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, NTSC4.43, NTSC3.58 Channel coverage

B/G VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41 I UHF: 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: Z1 to Z39, S01 to S03, S1 to S41

M VHF: 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) 6W + 6W Number of terminal

Video Input: 3 Output:1 Phono jacks; 1 Vp-p, 75 ohms Audio Input: 3 Output: 1 Phono jacks; 500 mVrms S Video Input: 1 Y : 1 Vp-p, 75 ohms,

unbalanced, sync negative

C : 0.286 Vp-p, 75 ohms

Headphone Output: 1 Minijack

Picture tube Super Trinitron Super Trinitron Plus

(25 in.) (29 in.)

Tube size (cm) 64 72 Measured diagonally Screen size (cm) 60 68 Measured diagonally

Dimension (w/h/d, mm) 712 × 521 × 520 780 × 577 × 542 Mass (kg) 33 43 Accessory (optional) TV stand (SU-25H) TV stand (SU-29H)

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 W ARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL T O SAFE OPERA TION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

– 2 –

TABLE OF CONTENTS

Section Title Page

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

2. DISASSEMBLY

2-1. Rear Cover Removal ................................................ 11

2-2. Speaker Removal ..................................................... 11

2-3. Chassis Assy Removal ............................................. 11

2-4. Service Position ....................................................... 12

2-5. S1 Board Removal ................................................... 12

2-6. A and D Boards Removal ........................................ 12

2-7. F1 and H3 Boards Removal..................................... 13

2-8. Picture Tube Removal.............................................. 13

3. SET-UP ADJUSTMENTS

3-1. Beam Landing .......................................................... 15

3-2. Convergence............................................................. 16

3-3. Focus Adjustment .................................................... 19

3-4. G2 (Screen) and White Balance Adjustments......... 20

4. SELF DIAGNOSIS FUNCTION................................ 21

5. CIRCUIT ADJUSTMENT

5-1. Adjustments with Commander ................................ 22

5-2. Adjustment Method ................................................. 23

5-3. Picture Quality Adjustment ..................................... 27

5-4. A Board Adjustment ................................................ 27

5-5. ABoard Adjustyment After IC003 (Memory)

Replacement............................................................. 28

5-6. Picture Distortion Adjustment................................. 28

Section Title Page

6. DIAGRAMS

6-1. Block Diagram ......................................................... 29

6-2. Frame Schematic Diagram ...................................... 31

6-3 Circuit Boards Location .......................................... 34

6-4. Schematic Diagrams and Printed Wiring Boards .... 34

(1) Schematic Diagrams of D, F1 and H3 Boards ........ 35

(2) Schematic Diagram of A Board ............................... 43

(3) Schematic Diagram of S1 Board ............................. 50

(4) Schematic Diagram of C2 Board ............................ 53

(5) Schematic Diagrams of VM Board ......................... 55

6-5. Semiconductors........................................................ 57

7. EXPLODED VIEWS

7-1. Picture Tube ............................................................. 59

7-2. Chassis ..................................................................... 60

8. ELECTRICAL PARTS LIST....................................... 61

– 3 –

– 4 –

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.

– 5 –

– 6 –

– 7 –

– 8 –

– 9 –

– 10 –

SECTION 2

DISASSEMBLY

2-1. REAR COVER REMOVAL

1Two screws (+BVTP4x16)

2 Rear cover

1Two screws

(+BVTP4x16)

1Six screws (+BVTP4x16)

2-2. SPEAKER REMOVAL

3Speaker (5cm) [KV-J29MF8J]

1Two screws (+BVTP4 x16)

2Bracket (R) assy,sp

2-3. CHASSIS ASSY REMOVAL

1Two claws

2Chassis assy

– 11 –



2-4. SERVICE POSITION

1PCB holder

2Chassis assy

Cut the four marked sections

with a nippers to remove a part of bracket.

When measuring the power supply voltage, just remove a part of bracket shown below.

ATTENTION

For safety reason this plate

must be remounted after cutting and taking away.

SAFETY REQUIREMENT

2 Two screws (+BVTP3 x 8) (7-685-646-71)

2-5. S1 BOARD REMOVAL

1 Screw (+BVTP3x12)

2 One claw

4 S1 Board

3 PCB holder

2-6. A AND D BOARDS REMOVAL

2 Five screws (+BVTP3 x12)

5 Two screws (+BVTP3 x12)

1 Four

connectors

7 D board

6 Four claws

4 A Board

3 Three

claws

– 12 –

2-7. F1 AND H3 BOARDS REMOVAL

5 connector

8 H3 Board

6 connector

3 F1 Board

1 Two connector

7 Two claws

2 Two

claws

4 Two Flat

cables

2-8. PICTURE TUBE REOVAL

6 C2 Board

0 Two DGC holder

[KV-J29MF8J]

! DGC clip

7 Neck assy

@ DGC

8 Deflection yoke

# Tension spring

4 Anode cap

1 Two screws

(+BVTP4 x16)

2 Speaker

bracket(L)assy

3 Speaker (5cm) [KV-J29MF8J ]

$ Two screws (Tapping 7+Crown Washer)

Cushion

9 Two DGC band

% Picture tube

[KV-J25MF8J]

0 Two DGC holder

! DGC clip

[KV-J29MF8J]

@ DGC 5 Chassis assy

$ Two screws

(Tapping 7+Crown Washer)

1 Two screws (+BVTP4 x16)

2 Speaker

bracket(R)assy

3 Speaker (5cm) [KV-J29MF8J]

– 13 –

• REMOVAL OF ANODE-CAP

NOTE : Short circuit the anode of the picture tube and the anode cap

to the metal chassis, CRT shield or carbon paint on the CRT, after removing the anode.

• REMOVING PROCEDURES

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

indicated by the arrow a.

• HOW TO HANDLE AN ANODE-CAP

1 Don't hurt the surface of anode-caps with sharp shaped

material!

2 Don't press the rubber hardly not to hurt inside of anode-

caps! A material fitting called as shatter-hook terminal is built in the rubber.

3 Don't turn the foot of rubber over hardly! The shatter-

hook terminal will stick out or hurt the rubber.

2 Using a thumb pull up the rubber cap firmly in the direction

indicated by the arrow b.

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 up it in the direction of the arrow c.

– 14 –

SECTION 3

SET-UP ADJUSTMENTS

• The following adjustments should be made when a complete

realignment is required or a new picture tube is installed.

• These adjustments should be performed with rated power

supply voltage unless otherwise noted.

Controls and switch should be set as follows unless otherwise noted:

PICTURE control.......................................................... RESET

BRIGHTNESS control............................................... CENTER

.................................................................................................................................................................................................................................

Preparations :

• In order to reduce the influence of geomagnetism on the set's

picture tube, face it east or west.

• Switch on the set's power and degauss with the degausser.

Perform the adjustments in order as follows :

1. Beam Landing

2. Convergence

3. Focus

4. White Balance Note : Test Equipment Required.

1. Color-bar/Pattern Generator

2. Degausser

3. Oscilloscope

Neck assy

Behind the G1 edge

3-1. BEAM LANDING

1. Input a white signal with the pattern generator. Contrast Brightness

2. Position neck ass'y as shown in Fig3-2.

3. Set the pattern generator raster signal to a red raster.

4. Move the deflection yoke to the rear and adjust with the purity control so that the red is at the center and the blue and the green take up equally sized areas on each side. (See Figures 3-1 through 3-3.)

5. Move the deflection yoke forward and adjust so that the entire screen is red. (See Figure 3-1.)

6. Switch the raster signal to blue, then to green and verify the condition.

7. When the position of the deflection yoke has been decided, fasten the deflection yoke with the screws and DY spacers.

8. If the beam does not land correctly in all the corners, use a magnet to adjust it. (See Figure 3-4.)

}

normal

G2G1 G3

Blue

Green

Red

Purity control corrects this area.

Fig. 3-2

Fig. 3-3

Disk magnets or rotatable disk magnets correct these areas (a-b).

Fig. 3-1

– 15 –

Deflection yoke positioning corrects these areas.

Fig. 3-4

3-2. CONVERGENCE

Preparations :

• Before starting this adjustment, adjust the focus, horizontal size

and vertical size.

• Minimize the brightness setting.

• Provide dot pattern.

(1) Horizontal and Vertical Static Convergence

Center dot

R G B

H. STAT

R G B

V. STAT Magnet

• Tilt the V.STAT magnet and adjust the static convergence by

opening or closing the V.STAT magnet. If the V.STAT magnet is moved in the direction of the a and b arrows, the red, green, and blue points move as shown below.

B GG R

R G B

RV702 H. STAT

RV701 SCREEN (G2)

C Board

1. (Moving horizontally), adjust the H.STAT control so that the red, green and blue points are on top of each other at the center of the screen.

2. (Moving vertically), adjust the V.ST AT magnet so that the red, green and blue points are on top of each other at the center of the screen.

3. If the H.STAT variable resistor cannot bring the red, green and blue points together at the center of the screen, adjust the horizontal convergence with the H.STAT variable resistor and the V.STAT magnet in the manner given below. (In this case, the H.STAT variable resistor and the V.STAT magnet influence each other.)

B G R

– 16 –

+ 36 hidden pages