Sony TRINITRON KV-T25SN81 User manual

MODEL COMMANDER DEST. CHASSIS NO.

KV-T25SN81

RM-870 New Zealand SCC-K37F-A

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

COLOR TV

BG-1S

– 2 –

KV-T25SN81

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/Bilingual system NICAM Stereo/Bilingual B/G, A2 Stereo/Bilingual (German) B/G

Teletext Language English, German, Swedish, Italian, French, Spanish

Channel coverage VHF : 1 to 11 / UHF : 21 to 69 / CATV: S01 to S03, S1 to S41

Audio output (speaker) 5W ×2

Inputs Antenna: 75 ohms

VIDEO IN jacks: phono jacks

Video: 1Vp-p, 75 ohms

Audio: 500 mVrms, high impedance

Outputs Headphone jack: minijack

MONITOR OUT jacks: phono jacks

Video: 1Vp-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 CAPTOTHE 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, EXPLODEDVIEWS AND INTHE

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-T25SN81

RM-870

TABLE OF CONTENTS

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

1. GENERAL.................................................................... 5

2. DISASSEMBLY

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

2-2. A Board Removal ................................................ 11

2-3. F1 Board Removal ............................................... 11

2-4. Service Position ................................................... 11

2-5. Replacement of Parts ........................................... 12

2-6. Demagnetization Coil Removal .......................... 12

2-7. Picture Tube Removal.......................................... 13

3. SET-UP ADJUSTMENTS

3-1. Beam Landing...................................................... 14

3-2. Convergence......................................................... 15

3-3. Focus Adjustment ................................................ 17

3-4. G2 (Screen) and White Balance Adjustments..... 17

4. CIRCUIT ADJUSTMENTS

4-1. Adjustments with Commander............................ 18

4-2. Adjustment Method ............................................. 19

4-3. A Board Adjustment after IC003 (Memory)

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

4-4. Picture Distortion Adjustment ............................. 22

5. DIAGRAMS

5-1. Block Diagram ...................................................... 25

5-2. Circuit Boards Location ....................................... 29

5-3. Schematic Diagrams and Printed Wiring Boards. 29

(1) Schematic Diagram of A Board ........................... 33

(2) Schematic Diagrams of A3, F1 and V1 Boards ... 37

(3) Schematic Diagrams of C and VM Boards .......... 45

5-4. Semiconductors..................................................... 48

6. EXPLODED VIEW

6-1. Chassis .................................................................. 51

7. ELECTRICAL PARTS LIST ................................... 53

Section Title Page Section Title Page

– 4 –

KV-T25SN81

RM-870 SELF DIAGNOSIS FUNCTION

If no acknowledgement is returned from a device which is turned "ON", the device has a problem.

In this case, one of the LED's responding to the problem device will flicker a defined number of times.

Flickering is operated by lighting the LED's for 60ss each time.

The flickering frequency responding to each failed device is shown below.

All the devices are checked one after another from the left of the table.

If an error is found, the responding LED will start flickering.

So, if more than 1 device have failed, only the one on the left side will flicker.

Device

Flickering

Frequency

NONVOLATILE

MEMORY

—

Y/C JUNGLE

(IC300)

—

TONE

CONTROL

(IC201)

– 11 –

KV-T25SN81

RM-870

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

SECTION 2

DISASSEMBLY

2Two screws

(BVTP 4×16)

3One screw

(BVTP 3×16)

1Two screws

(BVTP 4×16)

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

Lever

A board

F1 board

– 12 –

KV-T25SN81

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

3Demagnetization coil

4Tension spring

Picture tube

2DGC holder

1DGC band

Remove the claw

Cut

Light guide

Power button

Two screws

(BVTP 3×12)

Two screws

(BVTP 3×12)

– 13 –

KV-T25SN81

RM-870

2-7. PICTURETUBE REMOVAL

NOTE : The picture tube for this model are upside-down, and the position for the anode-cap

and tension spring are changed accordingly.

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

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.

•HOWTOHANDLE ANANODE-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-caps.

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

•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.

2 A board

5 Deflection yoke

Cushion

6 Four screws

(Tapping screws)

1 Anode cap

4 C board

3 F1 board

7 VM board

– 14 –

KV-T25SN81

RM-870

•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........................................................... normal

BRIGHTNESS control................................................... normal

Perform the adjustments in the following order :

1. Beam Landing

2. Convergence

3. Focus

4. White Balance

Note : Test Equipment Required.

1. Color-bar/Pattern Generator

2. Degausser

3. Oscilloscope

SECTION 3

SET-UP ADJUSTMENTS

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

Fig. 3-4

Fig. 3-3

GREEN

BLUE RED

Fig. 3-2

}normal

Purity control

Deflection yoke positioning

corrects these areas.

Purity control corrects

this area. Disk magnets or rotatable

disk magnets correct

these areas (a-d).

Fig. 3-1

Neck assy

G1 G2 G3

Preparation :

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

picture tube, face it east or west.

•Switch on the power and degauss with the degausser.

3-1. BEAM LANDING

1. Input a white signal with the pattern generator.

Contrast

Brightness

2. Position neck assy as shown in Figure 3-1.

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

4. Move the deflection yoke to the rear and adjust with the purity

control so that the green is at the center and the blue and the red

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 green. (See Figure 3-1.)

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

condition.

7. When the position of the deflection yoke has been decided,

fasten the deflection yoke with the screw.

8. If the beam does not land correctly in all the corners, use a

magnet to adjust it.

(See Figure 3-4.)

– 15 –

KV-T25SN81

RM-870

3-2. CONVERGENCE

Preparation :

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

and vertical size.

•Minimize the brightness setting.

•Provide dot pattern.

(1) Horizontal andVertical Static Convergence

1. (Moving vertically), adjust theV.STAT magnet so that the red,

green and blue dots in the center of the screen are separated

from each other.

2. Adjust the BMC (Hexapole) magnet so that the red, green and

blue dots are aligned in a straight line.

3. Adjust the BMC (Hexapole) magnet so that the red, green and

blue dots are balanced (ie. equal distance) on either side of the

green dot.

4. (Moving horizontally), adjust the H.STAT VR magnet so that

the red, green and blue dots converge on top of each other in

the center of the screen.

•The respective dot positions resulting from moving each magnet

interact, so be sure to perform adjustment while tracking.

Use the V. STAT magnet to adjust the red, green and blue dots

so they coincide at the center of screen (by moving the dots in

the horizontal direction).

BMC (Hexapole)

V.STAT

Purity

•Operation of the V.STAT magnet.

If the V-STAT magnet is moved in the direction of the aand

barrows, the red, green and blue dots move as shown below.

B G R

R G B

•Operation of BMC (Hexapole) Magnet.

To align or balance the red, green and blue dots, adjust the BMC

(Hexapole) magnet as shown below.

RG B RGB R GB

RGB RGB

RGB

R G B

Center dot

V.STAT Magnet

C board RV 701

SCREEN (G2)

– 16 –

KV-T25SN81

RM-870

3. Move the deflection yoke as shown in the figure below and

optimize the convergence.

4. Tighten the deflection yoke screws.

5. Install the deflection yoke spacer.

(2) Dynamic Convergence Adjustment

Preparation :

•Before starting this adjustment, adjust the horizontal static

convergence and the vertical static convergence.

1. Slightly loosen the deflection yoke screws.

2. Remove the deflection yoke spacer.

RGB

RGBR

RGBRGB

RGB RGB

BRGBR

RGB

(3) Screen-corner Convergence

a-d : screen-corner

misconvergence

Fix a Permalloy assy

corresponding to the

misconverged areas

Permalloy assembly

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