Sony Trinitron KV-PF14K70, TRINITRON Series KV-PF14K70 Service Manual

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SERVICE MANUAL

BG-3S

CHASSIS

MODEL COMMANDER DEST. CHASSIS NO.

KV-PF14K70 RM-960 Korea SCC-U35B-A

MODEL COMMANDER DEST. CHASSIS NO.

TRINITRON

COLOR TV

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KV-PF14K70

RM-960

Power requirements 110-220V AC, 60 Hz

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

Television system M

Color system NTSC 3.58

Channel coverage VHF : 2 to 13/UHF : 14 to 69/CATV : 1 to 125

˘˘

˘ (Antenna) 75-ohm external terminal

˘˘

Audio output 3W

Number of terminal

≥

Picture tube 14 in.

Tube size (cm) 37 Measured diagonally

Screen size (cm) 34 Measured diagonally

Dimension (w/h/d, mm) 375 x 346 x 416

Mass (kg) 13

SPECIFICATIONS

(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

Note

Design and specifications are subject to change without notice.

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.

CAUTION

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. CIRCUIT ADJUSTMENTS THAT ARE CRITICAL TO SAFE OPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS SUSPECTED.

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TABLE OF CONTENTS

KV-PF14K70

RM-960

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 Multi Button ........................... 19

2-5-2. Replacement of Bar Optical ............................. 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 ......................................................... 33

5-2 Frame Schematic Diagram ...................................... 36

5-3 Circuit Boards Location .......................................... 38

5-4 Schematic Diagrams and Printed Wiring Boards ... 38

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

(2) Scheamtic Diagram of A(2/2) Board ................................. 44

(3) Schematic Diagrams of C3 and F Boards ......................... 50

5-5 Semicondutors ......................................................... 53

6. EXPLODED VIEWS

6-1. Chassis ..................................................................... 55

7. ELECTRICAL PARTS LIST ............................... 57

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KV-PF14K70

RM-960

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 F4601 (F board)

• H.OUT Q511 is shorted. (A board)

• -13V is not supplied. (A board)

• IC 503 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.

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2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT

2 times

5 times

KV-PF14K70

RM-960

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-PF14K70

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 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-PF14K70

RM-960

FROM

[+B] Q604 C3

[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-PF14K70

1 Chassis assy

Lever

Six screws (BVTP 4×16)

Two screw (BVTP 4×16)

1 Three connector

2 F board

Lever

2-1. REAR COVER REMOVAL

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SECTION 2

RM-960

DISASSEMBLY

2-3. F BRACKET REMOVAL

2-2. CHASSIS ASSY REMOVAL

2-4. SERVICE POSITION

(Note: Remove F Bracket first.)

A board

Screw

Terminal board bracket

Demagnetization coil

Tension spring

Picture tube

2-5. REPLACEMENT OF PARTS

Multi button

Two screws

Bar optical

One screw (BVTP 3×12)

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

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2-5-2. REPLACEMENT OF BAR OPTICAL

2-6. TERMINAL BRACKET REMOVAL

2-7. DEGAUSS COIL REMOVAL

KV-PF14K70

RM-960

KV-PF14K70

2 A board

5 Deflection yoke

Cushion

6 Four screws (Tapping screws)

1 Anode cap

F board

4 C3 board

Anode button

2-8. PICTURE TUBE REMOVAL

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•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

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.

RM-960

Anode button

3 When 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.

• HOW TO HANDLE AN ANODE-CAP

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.

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

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

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

SECTION 3

SET-UP ADJUSTMENTS

KV-PF14K70

RM-960

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

3. 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.)

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

screen is green. (See Figure 3-1.)

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

condition.

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

fasten the deflection yoke with the screws and DY spacers.

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

magnet to adjust it.

(See Figure 3-4.)

}

normal

Fig. 3-2

Red

Green

Fig. 3-3

Purity control corrects this area.

Blue

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

Fig. 3-1

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Deflection yoke positioning

corrects these areas.

Fig. 3-4

KV-PF14K70

RM-960

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

1 V. S TA T

b b

Center dot

R G B

H. STAT VR

V.STAT Magnet

RV 702

C3 board

(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.

2 H. STAT VR

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

V.STAT

BMCPurity

BMC (Hexapole)

Purity

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(2) Dynamic Convergence Adjustment

Preparation:

• Before starting this adjustment, adjust the horizontal static

convergence and the vertical static convergence

KV-PF14K70

RM-960

on DY

B R

TLVYCH

YCH TLV

(3) Screen-corner Convergence

a-d : screen-corner misconvergence

Fix a Permalloy assy corresponding to the misconverged areas

a to d : Permalloy assembly

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+ 29 hidden pages

Sony Trinitron KV-PF14K70, TRINITRON Series KV-PF14K70 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual