Sony KV-XA21M80, KV-XA21M83, KV-XA21M50, KV-XA21M61, KV-XA21M60 Service manual

SERVICE MANUAL

BG-3R

CHASSIS

MODEL COMMANDER DEST. CHASSIS NO.

KV-XA21M80 RM-952 E SCC-U53B-A KV-XA21M83 RM-952 ME SCC-U48D-A KV-XA21M50 RM-952 EM SCC-U45F-A KV-XA21M50 RM-952 GE SCC-U52B-A KV-XA21M61 RM-952 EM SCC-U45E-A KV-XA21M61 RM-952 GE SCC-U52C-A

MODEL COMMANDER DEST. CHASSIS NO.

KV-XA21M60 RM-952 S SCC-U49D-A KV-XA21M80 RM-952 ME SCC-U48C-A

JUMP

SOUND

PROGRÁ

MODE

FAVORITE

TRINITRON

COLOR TV

KV-XA21M80/XA21M83/XA21M50/

KV-XA21M61/ XA21M60

RM-952

Power requirements 110-240 V AC, 50/60 Hz KV-XA21M80(E)/M80(ME)/

220-240 V AC, 50/60 Hz KV-XA21M61/M50(EM)/M60(S)

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 KV-XA21M61/M60 only

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: S01 to S03, S1 to S41, Z1 to Z39

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) 5W + 5W

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 Stereo 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

SPECIFICATIONS

Note

M50(GE)/M83(ME)/M61(GE)

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.

– 2 –

KV-XA21M80/XA21M83/XA21M50/

KV-XA21M61/XA21M60

RM-952

Section Title Page

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

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

2. DISASSEMBLY

2-1. Rear Cover Removal ................................................ 25

2-2. Speaker Removal ..................................................... 25

2-3. Chassis Assy Removal ............................................. 25

2-4. F Bracket Removal .................................................. 25

2-5. J2 Board and Terminal Bracket Removal ................ 25

2-6. Service Position ....................................................... 25

2-7. Replacement of Parts ............................................... 26

2-7-1 Replacement of Light Guide .............................................. 26

2-7-2 Replacement of Power Button ........................................... 26

2-8. Picture Tube Removal .............................................. 26

2-9. Removal of Anode Cap............................................ 27

3. SET-UP ADJUSTMENTS

3-1. Beam Landing .......................................................... 28

3-2. Convergence Adjustment......................................... 29

3-3. Focus Adjustment .................................................... 31

3-4. G2 (Screen) and White Balance Adjustments......... 31

Section Title Page

5. DIAGRAMS

5-1. Block Diagram .......................................................... 39

5-2. Circuit Board Location ............................................. 41

5-3. Schematic Diagrams ................................................. 42

(1) Schematic Diagrams of F, J2 and C1 Boards ..... 43

(2) Schematic Diagram of A Board.......................... 45

(3) Schematic Diagram of V1Board ......................... 61

5-4. Voltage Measurements .............................................. 65

5-5. Waveforms ................................................................ 68

5-6. Printed Wiring Boards and Parts Location ............... 69

5-7. Semiconductors ......................................................... 73

6. EXPLODED VIEWS

6-1. Picture Tube .............................................................. 75

6-2. Chassis ...................................................................... 76

7. ELECTRICAL PARTS LIST...................................... 77

4. CIRCUIT ADJUSTMENTS

4-1. Adjustments with Commander ................................ 32

4-2. Adjustment Method ................................................. 32

4-3. Picture Quality Adjustments.................................... 37

4-4. Deflection Adjustment ............................................. 37

4-5. A Board Adjustment After IC003

(memory) Replacement ........................................... 37

4-6. Picture Distortion Adjustment ................................. 38

– 3 –

KV-XA21M80/XA21M83/XA21M50/

KV-XA21M61/ XA21M60

RM-952

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)

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

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.

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.

• Micro reset

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).

—

101:00 or

101:001~225

• Discharge CRT (C1 Board)

• Static discharge

• External noise

• Power is shut down shortly,

after this return back to normal.

• Detect Micro latch up.

– 4 –

2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

2 times

3 times

KV-XA21M80/XA21M83/XA21M50/

KV-XA21M61/XA21M60

RM-952

Diagnostic Item Flash Count*

+B overcurrent/overvoltage 2 times Vertical deflection stopped

White balance failure 5 times

Lamp ON 0.3 sec.

Lamp OFF 0.3 sec.

Lamp OFF 3 sec.

* One flash count is not used for self-diagnostic.

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.

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 –

KV-XA21M80/XA21M83/XA21M50/

KV-XA21M61/ XA21M60

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

FROM

CRT

FROM

[+B] Q604 C6

[V] Q509/507

IC301

Y/CHROMA JUNGLE

IK-IN

MP/

PROTECT

SDA

IC001

SYSTEM

IO-8DAT B-DAT

O-LED

IO-SDAT

IC003

MEMORY

521

[+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.

[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.)

– 6 –

WARNING

• Dangerously high voltages are present inside the TV.

• Operate the TV only between 110 – 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.

(KV-XA21M61(EM)/XA21M50(EM)/XA21M60(S))

WARNING

• Dangerously high voltages are present inside the TV.

• Operate the TV only between 220

– 240 V

AC.