Sony KV-PF21K70 Trinitron Bedienungsanleitung

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KV-PF21K70 RM-960 Korea SCC-U35A-A

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

COLOR TV

SERVICE MANUAL BG-3S

Self Diagnosis

Supported model

MODEL COMMANDER DEST. CHASSIS NO.

123

789

ENT

JUMP

SOUND

MODE CHVOL

FAVORITE

WAKEUP

SLEEP

SELECT

PICMODE

CABLE AUTO

PROGRAM ADD/

ERASE

MUTING

MTS VIDEO TV

POWER

DISPLAY

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– 2 –

KV-PF21K70

RM-960

SPECIFICATIONS

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 !ONTHE

SCHEMATIC DIAGRAMS, EXPLODEDVIEWS AND INTHE 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. CIRCUIT ADJUSTMENTS THAT ARE

CRITICAL TO SAFE OPERATION ARE IDENTIFIED IN THIS

MANUAL.FOLLOW THESEPROCEDURES WHENEVER CRITICAL

COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS

SUSPECTED.

Note

Power requirements 110-220 V AC, 60 Hz

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

Television system M

Color system NTSC3.58

Channel coverage VHF : 2 to 13

UHF : 14 to 13

CATV : 1 to 125

˘˘

˘(Antenna) 75-ohm external terminal

Audio output 3W

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

(Earphone) Output : 1 Minijack

Picture tube 21 inch

Tube size (cm) 54 Measured diagonally

Screen size (cm) 51 Measured diagonally

Dimension (w/h/d, mm) 490 x 458 x 487

Mass (kg) 25

Design and specifications are subject to change without notice.

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KV-PF21K70

RM-960

TABLE OF CONTENTS

Section Title Page

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

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

2. DISASSEMBLY

2-1. Rear Cover Removal................................................ 18

2-2. Chassis Assy Removal ............................................. 18

2-3. F Bracket Removal .................................................. 18

2-4. Service Position ....................................................... 18

2-5. Replacement of Parts ............................................... 19

2-5-1. Replacement of Control Button ....................... 19

2-5-2. Replacement of Bar Control............................. 19

2-6. Terminal Bracket Removal ...................................... 19

2-7. Degauss Coil Removal............................................. 19

2-8. Picture Tube Removal.............................................. 20

3. SET-UP ADJUSTMENTS

3-1. Beam Landing .......................................................... 21

3-2. Convergence............................................................. 22

3-3. Focus Adjustment .................................................... 24

3-4. G2 (Screen) and White Balance Adjustments......... 24

4. CIRCUIT ADJUSTMENTS

4-1. Adjustments with Commander ................................ 25

4-2. Adjustment Method ................................................. 26

4-3. Picture Quality Adjustments.................................... 31

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

Replacement............................................................. 31

4-5. Picture Distortion Adjustment ................................. 32

Section Title Page

5. DIAGRAMS

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

5-2 Frame Schematic Diagram ...................................... 38

5-3 Circuit Boards Location .......................................... 40

5-4 Schematic Diagrams and Printed Wiring Boards ... 40

(1) Schematic Diagram of A(1/2) Board....................... 41

(2) Scheamtic Diagram of A(2/2) Board....................... 45

(3) Schematic Diagrams of C3 and VM1 Boards ......... 52

(4) Schematic Diagram of F Board ............................... 57

5-5 Semicondutors ......................................................... 59

6. EXPLODEDVIEW

6-1. Chassis ..................................................................... 61

7. ELECTRICAL PARTS LIST................................... 63

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KV-PF21K70

RM-960

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. DIAGNOSTICTEST 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 F4601

(F Board)

• H.OUT Q511 is shorted.

(A board)

• -13V is not supplied.

(A board)

• IC 503 faulty (A board)

• IC 301 faulty (A board)

• G2 is improperly adjusted.

(Note 2)

• CRT problem.

• IC301 is faulty. (A board)

• No connection A board to

C3 board.

• Discharge CRT

(C3 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.

SELF DIAGNOSTIC FUNCTION

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KV-PF21K70

RM-960

2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

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.

3. STOPPINGTHE 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.

Lamp ON 0.3 sec. Lamp OFF 3 sec.

Lamp OFF 0.3 sec.

2 times

5 times

STANDBY/SLEEP lamp

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KV-PF21K70

RM-960

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 ScreenTest]

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

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.

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

Numeral "1" means a fault has been detected.

002 : 000

003 : 000

004 : 000

005 : 001

101 : 000

SELF DIAGNOSTIC

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KV-PF21K70

RM-960

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

FROM

[+B] Q604 C3

[V] Q509/507

IC001

SYSTEM IC003

MEMORY

B-DAT

IO-SDAT

IK-IN

MP/

PROTECT

IO-8DAT

O-LED

SDA

54521

18 51

4635

– 18 –

KV-PF21K70

RM-960

SECTION 2

DISASSEMBLY

2-2. CHASSIS ASSY REMOVAL

2-1. REAR COVER REMOVAL 2-3. F BRACKET REMOVAL

2-4. SERVICE POSITION

(Note: Remove F Bracket first.)

Six screws

(BVTP 4×16)

2Two screws

(BVTP 4×16)

Rear cover

1Chassis assy

Lever

1Three connectors

2F board

Lever

One screw

(BVTP 4×16)

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KV-PF21K70

RM-960

2-7. DEGAUSS COIL REMOVAL

2-6. TERMINAL BRACKET REMOVAL

2-5. REPLACEMENT OF PARTS

For replacement of the Multi Button and Bar Optical ,unscrew to exchange with the

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

2-5-1. REPLACEMENT OF MULTI BUTTON

2-5-2. REPLACEMENT OF BAR OPTICAL

Multi button

Two screws

(BVTP 3×12)

Bar Optical

One screw

(BVTP 3×12)

A board

Terminal board bracket

One screw

(BVTP 4×16)

1Demagnetization coil

2Tension spring

Picture tube

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KV-PF21K70

RM-960

2-8. PICTURETUBE REMOVAL

NOTE : The picture tube for OCE model is upside down, and the positon for the

anode cap and tension springs are changed accordingly.

•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

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-cap.

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.

•HOW TO HANDLE AN ANODE-CAP

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.

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

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

2A board

4C3 board

7Neck assy

5Deflection yoke

Cushion

6Four screws

(Tapping screws)

1Anode cap

F board

Anode button

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