Sony Trinitron KV-XG29N90 Service Manual

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SERVICE MANUAL

BG-3S

CHASSIS

MODEL COMMANDER DEST. CHASSIS NO.

KV-XG29N90 RM-915 Taiwan SCC-P13K-A

MODEL COMMANDER DEST. CHASSIS NO.

TRINITRON

®

COLOR TV

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KV-XG29N90

RM-915

Power requirements 110 V AC, 60 Hz

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

Television system M

Color system PAL*, PAL 60*, SECAM*, NTSC4.43*, NTSC3.58 * AV IN only

Stereo/ Bilingual system MTS

Channel coverage

˘˘

˘ (Antenna) 75-ohm external terminal

˘˘

Audio output 5W + 5W

Number of terminal

D (Video) 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
2 (Headphone) Output: 1 Minijack

Picture tube 29 inch

Tube size (cm) 72 Measured diagonally

Screen size (cm) 68 Measured diagonally

Dimension (w/h/d, mm) 794 × 573 × 517

Mass (kg) 48

SPECIFICATIONS

Note

VHF : 2 to 13
UHF : 14 to 69
CATV : 1 to 125

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.

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.

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TABLE OF CONTENTS

KV-XG29N90

RM-915

Section Title Page

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

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

2. DISASSEMBLY

2-1. Rear Cover Removal ................................................ 19

2-2. Speaker Removal ..................................................... 19

2-3. Chassis Assy Removal ............................................. 19

2-4. Service Position ....................................................... 19

2-5. Replacement of Parts ............................................... 20

2-5-1. Replacement of Control Button ..................................... 20

2-5-2. Replacement of Light Guide .......................................... 20

2-6. D3 Board Removal .................................................. 20

2-7. Terminal Bracket Removal ...................................... 20

2-8. H2 Board Removal .................................................. 21

2-9. A and B6 Boards Removal ...................................... 21

2-10. Picture Tube Removal .............................................. 21

3. SET-UP ADJUSTMENTS

3-1. Beam Landing .......................................................... 23

3-2. Convergence............................................................. 24

3-3. Focus Adjustment .................................................... 26

3-4. G2 (Screen) and White Balance Adjustments......... 27

Section Title Page

5. DIAGRAMS

5-1. Block Diagram ......................................................... 37

5-2. Frame Schematic Diagram ...................................... 40

5-3 Circuit Boards Location .......................................... 43

5-4. Schematic Diagrams and Printed Wiring Boards ... 44

(1) Schematic Diagram of A (1/2) Board...................... 47

(2) Schematic Diagrams of A (2/2) and D3 Boards ..... 51

(3) Schematic Diagram of C6 Board ............................... 57

(4) Schematic Diagrams of H2 and VM1 Boards ......... 59

(5) Schematic Diagram of B6 Board ............................ 67

5-5. Semiconductors ........................................................ 70

6. EXPLODED VIEWS

6-1. Speaker Bracket ....................................................... 73

6-2. Chassis ..................................................................... 74

6-3. Picture Tube ............................................................. 75

7. ELECTRICAL PARTS LIST ....................................... 76

4. CIRCUIT ADJUSTMENT

4-1. Adjustments with Commander ................................ 28

4-2. Adjustment Method ................................................. 29

4-3. Picture Quality Adjustments .................................... 34

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

Replacement............................................................. 34

4-5. Picture Distortion Adjustment ................................. 35

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KV-XG29N90

RM-915

SELF DIAGNOSTIC FUNCTION

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

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 F8601
(B6)

• H.OUT Q511 is shorted. (A
board)

• IC1800 is shorted. (C6
board)

• -13V is not supplied. (A
board)

• IC 503 faulty (A board)

• G2 is improperly adjusted.
(Note 2)

• CRT problem.

• Video 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

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.

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2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

2 times

5 times

KV-XG29N90

RM-915

Lamp ON 0.3 sec.

Lamp OFF 0.3 sec.

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.

Lamp OFF 3 sec.

STANDBY/SLEEP lamp

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.

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KV-XG29N90

RM-915

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 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

SELF DIAGNOSTIC

002 : 000
003 : 000
004 : 000
005 : 001

101 : 000

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

Numeral "1" means a fault has been detected.

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.

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6. SELF-DIAGNOSTIC CIRCUIT

KV-XG29N90

RM-915

FROM

[+B] Q604 C6

[V] Q509/507

[+BovercurrentªOCPº]

FROM

CRT

IC301

Y/CHROMA JUNGLE

IK-IN

MP/

18 51

PROTECT

SDA

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

4635

IC001

SYSTEM

IO-8DAT

O-LED

IO-SDAT

MEMORY

54521

B-DAT

IC003

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.)

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KV-XG29N90

2 Eight screws

(+BVTP 4 × 16)

3 Three screws

(+BVTP 4 × 16)

1 Rear cover

1 Eight screws

(+BVTP 4 × 16)

3 Four screws

(+BVTP 3 × 16)

2 Bracket, speaker

1 Chassis assy

RM-915

SECTION 2

DISASSEMBLY

(Note: Remove F Bracket first.)

2-3. CHASSIS ASSY REMOVAL

2-4. SERVICE POSITION

2-1. REAR COVER REMOVAL

2-2. SPEAKER REMOVAL

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KV-XG29N90

Control button

Two screws

(+BVTP 3 × 12)

One screw

(+BVTP 3 × 12)

1 Three connectors

2 One claw

3 D3 board

3 Two claws

4 Terminal bracket

1 Two screws

(+ BVTP 3 × 12)

2 One screw

(+ BVTP 4 × 16)

RM-915

2-6. D3 BOARD REMOVAL

2-7. TERMINAL BRACKET REMOVAL

2-5. REPLACEMENT OF PARTS

For replacement of the Control Button and Light Guide, unscrew them, exchange

with the new parts, and fix them with screws (+BVTP) respectively.

2-5-1. REPLACEMENT OF CONTROL BUTTON

2-5-2. REPLACEMENT OF LIGHT GUIDE

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KV-XG29N90

3 Two connectors

4 One screw (+BVTAP 3

× 12)

1 Two connectors

4 Four claws

5 H2 Board

2 Two connectors

4 B6 Board

5 A Board

1 Two screws

(+BVTAP 3 × 12)

2 Two screws

(+BVTAP 3 × 12)

! Four DGC clips

!ª Degaussing coil

0 Four claws

1 Four screws

(+BVTP 3 × 16)

2 Speaker Bracket

assy (L)

5 Speaker Bracket

assy (R)

!¢ Two screws

(Tapping)

6 Chassis assy

9 Deflection

yoke

8 Neck assy

7 C6 board

5 Anode cap

! Picture tube

Cushion

!¢ Two screws

(Tapping)

!£ Tension

spring

3 Eight screws

(+BVTP 4 × 16)

4 Eight screws

(+BVTP 4 × 16)

6 Four screws

(+BVTP 3 × 16)

DGC holder

DGC holder

Cushion (50 × 550)

DGC

Cushion (50 × 550)

DGC

RM-915

2-10 PICTURE TUBE REMOVAL

Note: The picture tube for New Zealand model is upside down,

and the position for anode cap and tension spring are changed

accordingly.

2-8. H2 BOARD REMOVAL

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2-9. A AND B6 BOARDS REMOVAL

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KV-XG29N90

Anode button

a

a

b

b

c

RM-915

the anode cap to the metal chassis, CRT shield or carbon paint on the

CRT.

•REMOVAL OF ANODE-CAP

NOTE : After removing the anode, short circuit the anode of the picture tube and

•REMOVING PROCEDURES

1 Turn up one side of the rubber cap in the direction indicated by the arrow a.

2 Using a thumb pull up the rubber cap firmly in the direction indicated by the arrow b.

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can be removed by turning up the rubber cap and pulling it up in the direction of the

arrow c.

3 When one side of the rubber cap is separated from the anode button, the anode-cap

• HOW TO HANDLE AN ANODE-CAP

A metal fitting called the shatter-hook terminal is built into the rubber.

The shatter-hook terminal will stick out or damage the rubber.

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-cap.

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

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SECTION 3

SET-UP ADJUSTMENTS

KV-XG29N90

RM-915

• 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 switches should be set as follows unless otherwise noted:

PICTURE control ........................................................... normal

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

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

Preparation :

• 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 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

Purity control

3-1. BEAM LANDING

1. Input a white signal with the pattern generator.

Contrast

Brightness

2. Position neck assy as shown in Fig3-2.

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 3-4.)

5. Move the deflection yoke forward and adjust so that the entire

screen is green. (See Figure 3-2.)

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 screws and DY spacers.

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

magnet to adjust it.

(See Figure 3-5.)

}

normal

Red

Purity control
corrects this area.

b

a

Fig. 3-3

Blue

Green

Fig. 3-4

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

Neck assy

Behind the G2 edge

G2G1 G3

Fig. 3-1

Fig. 3-2

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c

Deflection yoke positioning
corrects these areas.

a

d

d

Fig. 3-5

b

c

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KV-XG29N90

RM-915

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 and Vertical Static Convergence

BMCPurity

BMC (Hexapole)

Purity

Center dot

R G B

H. STAT VR

R

G

B

C6 Board

V. STAT

Magnet

RV702

H. STAT

RV701
SCREEN (G2)

1. (Moving horizontally), adjust the H.STAT control so that the

red, green and blue dots are on top of each other at the center of

the screen.

2. (Moving vertically), adjust the V.STAT magnet so that the red,

green and blue dots 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 dots 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, so be sure to perform adjustments

while tracking.)

DY pocket

V.STAT

1 V. S T A T

b b

2 H. STAT VR

R

3

b

V.STAT

a

a

a

G

B

B

G

R

b

R

G

B

a

b

B

G

R

b

a

R

G

b

B

B

G

R

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KV-XG29N90

RM-915

4 BMC (Hexapole) Magnet.

If the red, green and blue dots are not balanced or aligned, then

use the BMC magnet to adjust in the manner described below.

RG B R G B R GB

RB

G

RG

GB

RB

5 Y separation axis correction magnet adjustment.

1. Receive the cross-hatch signal and adjust [PICTURE] to [MIN]

and [BRIGHTNESS] to [STANDARD] .

2. Adjust the Y separation axis correction magnet on the neck

assembly so that the horizontal lines at the top and bottom of

the screen are straight.

Neck assy Neck assy

VM1 board

Note

1. The Red and Blue magnets should be equally far from the

horizontal center line.

2. Do not separate the Red and Blue magnets too far. (Less than

8 mm)

Blue

Red

VM1 board

Red

Blue

(2) Dynamic Convergence Adjustment

Preparation:

• Before starting this adjustment, adjust the horizontal static

convergence and the vertical static convergence

RB

TLH TLV

RB

B

R

R
B

YCH XCV

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KV-XG29N90

RM-915

TLV Rotate TLV-2 VOL (29”, 34”) on DY

Rotate TLV VOL (25”) on DY

XCV Rotate XCV Adj core on DY

YCH Rotate YCH VOL on DY

TLH Insert TLH Correction Plate to DY Pocket (Left or

Right)

ON DY:

YCH

TLV1

XCV

TLV2

(3) Screen-corner Convergence

3-3. FOCUS ADJUSTMENT

Adjust FOCUS control on the flyback transformer for the best

focus.

Focus

Screen

FLYB ACK TRANSFORMER (T503)

ba

a-d : screen-corner
misconvergence

cd

Fix a Permalloy assy corresponding to the misconverged
areas.

a

d

b

Permalloy assembly

c

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KV-XG29N90

RM-915

3-4. G2 (SCREEN) AND WHITE BALANCE

ADJUSTMENTS

1. G2 (SCREEN) ADJUSTMENT

1) Set the PICTURE to normal.

2) Put to VIDEO input mode without signals.

3) Connect R, G and B of the C6 board cathode to the

oscilloscope.

4) Adjust BRIGHTNESS to obtain the cathode voltage to the

value below.

5) Adjust G2 (screen) on the FBT until picture shows the point

before cut off.

Cathode setting voltage:
180V ±2(VDC)...29"

0 V

2. WHITE BALANCE ADJUSTMENT

1) Set to Service Mode (Refer Section 4-1: ADJUSTMENTS

WITH COMMANDER).

2) Input white raster signal.

3) Set the PICTURE to minimum.

4) Select GCT (WHB 4) and BCT (WHB 5) with

adjust the level with

5) Set the PICTURE to maximum.

6) Select GDR (WHB 1) and BDR (WHB 2) with

adjust the level with

7) Write into the memory by pressing

3. SUB BRIGHT ADJUSTMENT

1) Set to service mode.

2) Input a staircase signal of black to white from the pattern

generator.

3) BRIGHTNESS ....50%.

PICTURE ............MINIMUM

4) Select SBR (WHB7) with

level with

dimly lit.

[3] and [6] so that the second stripe from the right is

[3] and [6] for the best white balance.

[3] and [6] for the best white balance.

[MUTING] then [0].

[1] and [4], and adjust SBR (WHB7)

[1] and [4], and

[1] and [4], and

White

second from the right

Black

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