Sony TRINITRON KV-27FV15 Guía de instalación

S®

Training Manual

Circuit Description and Troubleshooting

Course: CTV-26

WEGATM Direct View

Television

AA-2W Chassis

Models: KV27FV15 KV32FV15

KV36FV15 KV32FS10

KV36FS10 KV32XBR250

KV36XBR250

Sony Service Company

Printed in U.S.A.

S is a trademark of Sony Electronics

Circuit Description

and Troubleshooting:

Model: KV27FV15 KV32FV15

KV32FV15 KV36FV15

KV32FS10 KV36FS10

KV32XBR250

KV36XBR250

Prepared by: National Training Department

Sony Service Company

A Division of Sony Electronics Inc.

Course presented by _____________________________________

Date___________________________________________________

Student Name ___________________________________________

SEL Service Company

A Division of Sony Electronics Inc.

1 Sony Drive

Park Ridge, New Jersey 07656

CTV261299 Printed in U.S.A.

Features 1

Board Descriptions 2

Picture Tube Defect Symptoms 3

V Chip 5

Introduction 5

What is V Chip Technology? 5

Parental Guideline Rating System 5

Parental Control Menu 6

Decoding 6

Power Supply Block 7

Standby Power Supply 9

Converter Operation 9

Regulation 9

Power On/Degaussing 13

Power On 13

Degaussing 13

Converter 15

Initial Start Up 15

Soft Start 15

Regulation 15

Troubleshooting 17

Table of Contents

Soft Start/Regulation/Foldback 19

Soft Start 19

Regulation 19

Foldback 19

Secondary Voltages 21

+135 Volts 21

+12 Volts 21

+9 Volts 21

+5 Volts 21

Audio B+ 21

Power Supply Protection 25

+135 Over Current Protection 25

Foldback 25

Vertical Deflection 27

Horizontal Deflection Block 31

Horizontal Out 33

Pincushion 35

H Protect 37

Appendix - Service Bulletins i

Features

Introduction

This course covers AA2W chassis Sony direct view televisions. These

sets are part of the WEGA line which contain the flat screen FD Trinitron

picture tubes. This course describes the Power Supply, Deflection and

Protection circuits with a twist of practical troubleshooting tips and known

solutions. In addition, this course reviews picture tube diagnostics and

solutions, plus the latest information on the V-Chip.

The US models listed below use the AA2W chassis design.

KV27FV15 KV36FS10

KV32FV15 KV32XBR250

KV36FV15 KV36XBR250

KV32FS10

The following is a list of features that all of these models have.

FD Trinitronﬁ Picture Tube Trinitone Color Temperature

Adjustment

Dynamic Picture Processor Velocity Modulation

Dynamic Focus Circuitry MTS Stereo TV Decoder3

Customer Tilt Correction dbxﬁ Noise Reduction

Auto Pedestal Clamp DAC Speaker System

Magnetic Quadra Pole Focus SRS 3D Audio Effect

V-Chip Parental Control 1Front/2Rear A/V Inputs

Program Palette Presets CaptionVision

(

)

/ XDS

(

Extended

Data Service)

Vertical Aperture Compensation Steady Sound With BBE

The table below shows which features are different between models.

KV27FV15 KV32/36F

V15

KV32/36FS

KV32/36XB

R250

Audio

Power

15Wx2 15Wx2 10Wx2 15Wx2

2 Tuner PIP Yes Yes No Yes

Component

Video Input

N/A* 1 1 1

Remote

Infrared

Headphones

N/A N/A N/A Yes

Comb Filter 3 line 3 line 3 line 3D

S-Link Yes Yes No Yes

*One significant difference between the 27FV15 model and the rest of the

models is the lack of the component input. This model will have a much

simpler video path because of this.

3D Digital Comb Filter analyzes the picture along the three dimensions

of height, width and time, to minimize even subtle picture artifacts.

3-Line Digital Comb Filter analyzes three TV scanning lines at a time for

better color.

Vertical Aperture Compensation sharpens picture definition and edge

detail on the vertical plane producing sharp horizontal edges.

Steady Sound™ Automatic Volume Control with BBE equalizes the

volume levels so there is consistency between programs and commer-

cials.

Auto SRS® Sound Enhancement creates a vivid stereo image using

the principles of human hearing to make the sound appear to come from

widely separated speakers.

Magnetic Quadra Pole reduces beam spot distortion and improves cor-

ner-to-corner focus, as well as picture sharpness.

Board Descriptions

Name Description

A Micon, Y/C Jungle, Tuner, Pincushion, H Deflection, V Deflection, H Deflection, Syston

AK Audio Amp, Surround Sound, Sub tuner, S-Link

C RGB Drive

G Power Supply

HA Front A/V Inputs, Menu Buttons

HB IR Detector

HX Buttons

T (XBR Only) IR Headphones

UX (XBR Only) 3D Comb Filter, A/V Switch, Audio Control, SRS, Chroma Decode, PIP Encode

UY (All Except XBR) 3 Line Comb Filter, A/V Switch, Audio Control, SRS, Chroma Decode, PIP Encode (except FS10 model)

WA Velocit

Modulation, Quadrapole

UX/UY

CIRCUIT BOARDS LOCATION

XBR/Non-XBR

(XBR only)

Picture Tube Defect Symptoms

Overview

Below is an excerpt from the CTV-25 course. It shows several picture

tube defect symptoms, some of which can be repaired without changing

the tube.

Defective Picture Tube Symptoms

Symptom Suspect Check Procedure

Dark picture or

one color

missing.

Heaters

Open

Apply 6Vdc to

the heater

terminals.

Some heaters

are connected

in parallel,

others in

series but all

take 6Vdc.

Clean the CRT pins and

examine the socket for

corrosion.

Apply 6Vdc to the CRT

heater pins, looking for a

glow in all three heaters.

Then if a heater(s) does not

glow, replace the picture

tube.

Dark picture Grid 1 to

Grid 2

short.

There should

be infinite

resistance

between the

G1 and G2

pins.

1. Unplug TV and remove

C board.

2. Apply 15-20Vdc

between the G1 and G2

pins to vaporize the

short. Current limit the

power supply to 1 Amp.

Bright red,

green or blue

picture.

One color

retrace lines

may be

present.

Retrace lines

are diagonal

lines that run

from lower left

to the upper

right corner.

Heater

Cathode

short.

Cathode to

Grid 1

short.

Remove the

R, G or B

video input to

the CRT for

the bright

color. If that

color is still

bright, the

tube is bad.

There should

be infinite

resistance

between any

CRT pin to

either Heater

pin. *

Replace tube.

Bright picture

with retrace

lines and/or

poor focus.

Grid 2 to

high

voltage

Grid 3

leakage.

Symptom is

that all three

colors are

bright.

Reduce G2 / screen voltage

to the lowest setting.

Vary focus control to both

limits several times.

Put on safety apparel.

Place the tube face down

and lightly tap the neck to

dislodge the particle.

RGB Rainbow.

(see rainbow

picture)

Aperture

grill was

unseated in

transit.

Rainbow of

colors can

start at the top

or bottom

(bottom

rainbow

shown).

A loose aperture grill is

dangerous and may cause

tube implosion. Use all

safety precautions. Do not

jar set. Transport TV face

down.

Purity / Beam

landing is off.

The TV s

degaussing

circuit did

not

demagnetiz

e aperture

grill metal

support.

Same color

blotches

remain at that

area of the

screen

regardless of

picture screen

changes.

Do not manually Degauss

the picture tube with a

strong degaussing coil **.

Repair the TV s degaussing

circuit. The thermistor or

cold solder is usually at

fault.

* Only the heater pins should have resistance. All other pins have infinite (∞)

resistance to each other and to either heater pins.

Used picture tubes that have a heater-cathode leakage/short have a low

restoration success level.

** Do not manually Degauss. New 27 35 picture tubes are magnetically

conditioned for optimum beam landing. Strong manual degaussing will

destroy this conditioning. Applying disc magnets (P/N = 1-452-094-00) to the

bell of the picture tube is the only way to compensate for lost magnetic

conditioning. The Sony manual degaussing tool can be used to degauss

these tubes because of its reduced field intensity (P/N = 7-700-781-01).

V Chip

Introduction

“Pursuant to the Commission’s rules, half of all new television models 13

inches or larger manufactured after July 1, 1999, and all sets 13 inches or

larger manufactured after January 1, 2000 must have V-Chip technology.

Set top boxes that allow consumers to use V-Chip technology on their

existing sets are now available.” This quote from the FCC web page

defines the guidelines that manufacturers of television receivers must fol-

low. No matter what your personal feelings on the ratings issue, you will

be forced to deal with it as a technician. Here you will be given informa-

tion on what V chip technology is, how it is implemented in Sony televi-

sions and what to do if the customer forgets their password.

Broadcasters are not required at this time to transmit ratings for their pro-

gramming. At this time, however, the major networks are broadcasting

ratings but all of their affiliates are not. In addition, many of the popular

cable stations are broadcasting V Chip ratings.

What is V Chip Technology?

The V Chip system allows broadcasters to send data that contains rat-

ings. The television receiver processes this data and acts according to

the programming wishes of the user. The user’s television has menu

options for determining which programs should be blocked. These op-

tions are compared to the data received and programs are blocked ac-

cordingly.

Parental Guideline Rating System

The ratings can be separated into three categories. They are TV Ratings,

Movie Ratings and Unrated. The following table shows the ratings for the

three categories.

The TV Ratings are both age and content based. The level of the content

rating is also based on age. For example, a program with a TV-PG V

(Violence) rating may contain moderate violence, while a TV-14 V rating

may contain more intense violence.

The consumer may choose to block Unrated programs. If they do this,

they need to be aware that emergency broadcasts, political programs,

sports, news, public service announcements, religious programs and

weather programs may be blocked.

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