Sony KV-XA21M93 User manual

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

COLOR TV

SERVICE MANUAL BG-3R

MODEL COMMANDER DEST. CHASSIS NO.

KV-XA21M93 RM-952 Hong Kong SCC-U50A-A

123

789

÷0

JUMP

SOUND

MODE

FAVORITE

PROGRÁ

–2 –

KV-XA21M93

RM-952

SPECIFICATIONS

Note

Power requirements 220-240 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

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

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 (TWEETER supplied) 10% distortion

Number of terminal

D(Video) Input: 2* Output: 1 Phono jacks; 1 VP-P, 75 ohms

≥(Audio) Input: 2* Output: 1 Phono jacks; 500 mVrms

2(Headphones) Output: 1 minijack

Picture tube 21 inch

Tube size (cm) 54 Measured diagonally

Screen size (cm) 51 Measured diagonally

Dimension (w/h/d, mm) 640 x 456 x 498

Mass (kg) 26

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-XA21M93

RM-952

TABLE OF CONTENTS

Section Title Page

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

1. GENERAL ........................................................................ 7

2. DISASSEMBLY

2-1. Rear Cover Removal ................................................ 20

2-2. Speaker Removal ..................................................... 20

2-3. Chassis Assy Removal ............................................. 20

2-4. F Bracket Removal .................................................. 20

2-5. J2 Board and Terminal Bracket Removal................ 20

2-6. Service Position ....................................................... 20

2-7. Replacement of Parts ............................................... 21

2-7-1 Replacement of Light Guide .............................................. 21

2-7-2 Replacement of Power Button ........................................... 21

2-8. Picture Tube Removal .............................................. 21

3. SET-UP ADJUSTMENTS

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

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

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

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

4. CIRCUIT ADJUSTMENTS

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

4-2. Adjustment Method ................................................. 28

4-3. Picture Quality Adjustments .................................... 33

4-4. Deflection Adjustment ............................................. 33

4-5. A Board Adjustment After IC003

(memory) Replacement ........................................... 33

4-6. Picture Distortion Adjustment ................................. 34

Section Title Page

5. DIAGRAMS

5-1. Block Diagram .......................................................... 35

5-2. Circuit Board Location ............................................. 37

5-3. Schematic Diagrams ................................................. 38

(1) Schematic Diagrams of F, J2 and C1 Boards ..... 39

(2) Schematic Diagram of A Board .......................... 41

5-4. Voltage Measurements .............................................. 57

5-5. Waveforms ................................................................ 60

5-6. Printed Wiring Boards and Parts Location ............... 61

5-7. Semiconductors ......................................................... 65

6. EXPLODED VIEWS

6-1. Picture Tube .............................................................. 67

6-2. Chassis ...................................................................... 68

7. ELECTRICAL PARTS LIST...................................... 69

–4 –

KV-XA21M93

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”.

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.

* IC700 out is faulty (C1 board).

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)

•IC700 is shorted (C1 board)

•-13V is not supplied. (A

board)

•IC 503 faulty (A board)

•G2 is improperly adjusted.

(Note 2)

•CRT problem.

•IC700 out is faulty

(C1 board)

•IC301 is faulty. (A board)

•No connection A board to

C1 board.

•Discharge CRT (C1 Board)

•Static discharge

•External noise

–5 –

KV-XA21M93

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 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

STANDBY/SLEEP lamp

Lamp ON 0.3 sec.

Lamp OFF 3 sec.

Lamp OFF 0.3 sec.

2 times

3 times

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.

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

–6 –

KV-XA21M93

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-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.

[ 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-XA21M93

RM-952

SECTION 1

GENERAL

WARNING

• Dangerously high voltages are present inside the TV.

• Operate the TV only between 110 – 240 V AC. (For Hong Kong only: 220 – 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 as high voltages and other hazards are

present inside the TV. Refer servicing and

disposal of the TV to qualified personnel.

Your TV is recommended for home use only.

Do not use the TV in any vehicle or where it may

be subject to excessive dust, heat, moisture or

vibrations.

Do not block the ventilation openings of the TV.

Do not install the TV in a confined space, such

as a bookcase or built-in cabinet.

For children’s safety, do not leave children alone

with the TV. 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.

For your own safety, do not touch any part of the

TV, the power cord and the antenna cable during

lightning storms.

Pull the power cord out by the plug. Do not pull

the power cord itself. Disconnect the TV before

moving it or if you are not going to use it for

several days.

Using Your New TV

Do not install the TV in an unstable position.

Use a proper TV stand. Do not place any objects on the TV.

WARNING (continued)

The operating instruction mentioned here are partial abstracts

from the Operating Instruction Manual.The page numbers of

the Operating Instruction Manual remain as in the manual.

–8 –

KV-XA21M93

RM-952

Using Your New TV

Step 2

Note

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

Front of TV

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 8(antenna) terminal, preset the signal

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

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

screen becomes blue.

(Not used for this model)

•Do not connect video equipment to the t2 (video input) jacks at the

front and the rear of your TV at the same time; otherwise the picture will

not be displayed properly on the screen.

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.

•To avoid battery leakage and damage to the remote, remove the batteries

from the remote if you are not going to use it for several days. If any

liquid that leaks from the batteries touches you, immediately wash it

away with water.

Insert the batteries

into the remote

Step 3

Preset the channels automatically

Tips

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

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

channel, then preset your TV manually (see page 11).

Note (Not used for this model)

•During automatic channel presetting, your TV screen will indicate

“B/G”, “I”, “D/K”or “M”for the TV system.

AUTO

PROGR

VHF LOW AUTO

L(MONO) R

PROGR

SELECT AUTO

PROGR

Using Your New TV

Getting Started

Step 1

Connect the antenna

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

Using Your New TV

IEC connector

(not supplied)

To video

and audio

outputs

(yellow)

-L (MONO) (white)

-R (red)

Audio/Video cable (not supplied)

Rear of TV

Connecting a VCR

To watch the video input, press t(see page 14).

(Not used for this model)

: Signal flow

or Antenna cable

(not supplied)

Antenna cable

(not supplied)

(yellow)

-L (MONO) (white)

-R (red)

To video

and audio

outputs Audio/Video cable (not supplied)

To t1 (video input)

To 8(antenna)

To antenna output

: Signal flow

VCR

Antenna cable (not supplied)

To antenna output

VCR

1 or 2 (video input)

Rear of TV

L(MONO)R

VIDEO IN

VIDEO OUT

VIDEO

AUDIO

VIDEO

VIDEO IN

VIDEO OUT

AUDIO

To 8(antenna)

KV-XA21M93

–9 –

KV-XA21M93

RM-952

Using Your New TV

Connecting the TWEETER

You can enjoy high quality sound by connecting the TWEETER.

Connect the wires to the TWEETER terminals at the rear of your TV. The

plain wire should be connected to the 3red terminal and the striped wire

to the #black terminal.

Notes

•Connect only the supplied TWEETER; otherwise your TV may

malfunction.

•Unplug your TV from the wall outlet when connecting the TWEETER.

•To prevent a malfunction caused by a short circuit of the terminals, make

sure that none of the TWEETER wire strands stick out, making contact

with it’s neighbouring TWEETER terminal.

Rear of TV

Striped

wire

Plain

wire

TWEETER (8 )

– +

WOOFER(8 )

– +

TWEETER

Using Your New TV

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 video input of the connected equipment, press t(see page 14).

Connecting a camcorder/video game equipment

using the t(video input) jacks

Notes

(Not used for this model)

•You can also connect video equipment to the t1 (video input) jack at

the rear of your TV.

KV-XG29M50 only

•You can also connect video equipment to the t1 or 2 (video input) jacks

at the rear of your TV.

•Do not connect video equipment to the t2 (video input) jacks at the

front and the rear of your TV at the same time; otherwise the picture will

not be displayed properly on the screen.

Connecting audio/video equipment using the T

(monitor output) jacks

(Not used for this model)

Front of TV

Camcorder

Video game

equipment

To video and

audio outputs

: Signal flow

(video input)

Audio/Video cable (not supplied)

(yellow)

-L (MONO)

(white)

-R (red)

Rear of TV

antenna

output

To video and

audio inputs

Audio system

audio

inputs

VCR

: Signal flow

Antenna cable (not supplied)

Audio/Video cable

(not supplied)

L(MONO)R

L(MONO) R

PROGR

SELECT AUTO

PROGR

L(MONO)

continued

To T

(monitor

output)

KV-XA21M93

(Not used for this model)

–10 –

KV-XA21M93

RM-952

Using Your New TV

Note

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

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

KV-XA21M93/XA21M80/XA21M61/XA21M50

(yellow)

-L (MONO)

(white)

-R (red)

Rear of TV

antenna

output

To video and

audio inputs

Audio system

audio

inputs

VCR

: Signal flow

To T

(monitor output)

Antenna cable (not supplied)

Audio/Video cable (not supplied)

L(MONO)

Connecting optional components (continued)

Using Your New TV

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.

3.8 mm

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