Sony TRINITRON KV-27FV15 Installation guide

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
A Division of Sony Electronics Inc ©1999
All Rights Reserved
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 ___________________________________________

S
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

1
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
(
CC
)
/ 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
10
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.

2
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
y
Modulation, Quadrapole
HX
C
HB
WA
G
A
UX/UY
HA
AK
CIRCUIT BOARDS LOCATION
XBR/Non-XBR
T
(XBR only)

3
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.
OR
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).

4

5
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.