Sony FD Trinitron WEGA KV-32FV16 Installation guide

S®
Training Manual
Circuit Description and Troubleshooting
Course: CTV-28
Direct View Television
AA2U Chassis
Models: KV-32FV16 KV-36FS16
KV-32FV26 KV-36FV16
KV-36FS12 KV-36FV26

Introduction 1
Overview 1
CTV-28 Objectives 1
Features 2
Audio Features 2
Video Features 2
Convenience Features 2
Input/Output 2
Feature Glossary 3
Board Descriptions 4
Overall Block 5
G Board 5
A/V Switching 5
Audio 5
Video 5
Deflection 7
Reset and NVM Operation 9
Reset 9
NVM Operation 9
Service Mode 11
Service Mode Display 11
Adjustment Items 11
Table of Contents
Other Service Mode Displays 13
Tuner Control 15
Tuning to a new Channel 15
Auto Programming 15
Auto SAP (Secondary Audio Program) 15
Video Path Block 17
Video Switching and Comb Filter 19
Video Switching 19
Comb Filter 19
PIP 25
Inputs 25
IC3308 YUV Switch 25
IC3303 PIP 25
Video Processing 27
Main Picture 27
CRT Drive 29
IK Pulses and Video Blanking 29
Tube Bias 29
Troubleshooting 29
Self-Diagnostics 31
AKB Failure 31
Vertical or Horizontal Failure 31

I2C Problems 33
Power Supply Block 35
Troubleshooting 35
Standby Power Supply 37
Converter Operation 37
Regulation 37
Over Current Protection (OCP) 39
Over Voltage Protection (OVP) 39
Secondary Output 39
Checking Q621 39
Power On/Degaussing 41
Power On 41
Degaussing 41
Converter 43
Initial Start Up 43
Soft Start 43
Regulation 43
Troubleshooting 45
Soft Start/Regulation/Foldback 47
Soft Start 47
Regulation 47
Foldback 47
Secondary Voltages 49
+135 Volts 49
+12 Volts 49
+9 Volts 49
Audio B+ 49
Power Supply Protection 55
Latch 55
+135 Over Current Protection 55
Foldback 55
Appendix
Vertical Deflection i
Horizontal Deflection Block iii
Horizontal Out v
Pincushion vii

1
Introduction
Overview
This course will cover the new Sony AA2U chassis. These sets are 32”and
36” only. This chassis is very similar to the AA2W chassis that was re-
leased last year. CTV-26 was a half-day course that covered portions of
that chassis. Consequently, this book will only cover new circuitry and
circuitry not covered in CTV-26.
A copy of the CTV-26 deflection circuits will be included in the Appendix.
Refer to it for information and troubleshooting techniques for the horizon-
tal and vertical sections of the AA2W and AA2U chassis.
There were a few improvements made to the AA2U chassis from the
AA2W chassis. They are as follows:
•A 16-bit processor is used to enhance the OSD. This year’s menu is
much more colorful and easier to use.
•A change has been made in the way the NVM is powered and used.
•A new PIP processor is used that eliminates the need for a chroma
decoder in the PIP path.
•A new 3D Comb Filter is used which contains a built-in A\D Converter.
No external A\D Converter is needed.
•The tuner has been changed from the BTF-WA411 to the BTF-WA412.
•Self-Diagnostics has been added.
CTV-28 Objectives
•Cover the features of the AA2U chassis so the students know what
they are.
•Show how the NVM is powered and used. Talk about the service
mode and what the various sections of adjustments do, what adjust-
ments should be performed and what adjustments should always con-
tain the same data.
•Show the video paths so the students know what they are and how
they can be troubleshot.
•Discuss Self-Diagnostics and how they can aid in quickly diagnosing
a broken set.
•Show pictures that highlight easy-to-get-to test points.
Service Manuals
As we move into the information age, Sony will no longer be producing
paper service manuals. Beginning January 2001 all service manuals will
be delivered via CD-ROM. As an interim step, the service manual for the
32-inch AA2U models (KV-32FV16 and KV-32FV26) comes with a CD-
ROM. The block diagrams, component locations and schematics are
supplied in the paper manual. The rest of the manual, including the ad-
justment section and parts list, is contained on the CD. Keep this in mind
when you need to perform a service call on these models. You may need
to bring a PC with you or print portions of the manual that you think you
may need.

2
Features
Overview
The following section discusses the various features of the AA2U models.
These features will be separated into four categories: Audio, Video, Con-
venience and Input/Output. The following models use the AA2U chassis:
AA2U chassis:
KV-32FV16 KV-36FS16
KV-32FV26 KV-36FV16
KV-36FS12 KV-36FV26
Audio Features
•All models contain the Auto Mute function. Auto Mute mutes the
audio when no signal is received. This prevents the loud static noise
from being heard when no station is received. The display will also
indicate No Signal in the lower left-hand corner. This is important to
remember because if the tuner has a poor reception problem the cus-
tomer may complain of no audio.
•All models are Stereo with Auto SAP.
•All “FV” models contain the Steady Sound Auto Volume, SRS 3D,
Dynamic Acoustic Chamber (DAC) Speaker System and 15Wx2
of audio power.
•The “FV26” models contain the Wireless IR Headphone feature.
•The “FS” models contain Matrix Surround and output 5Wx2 audio
power.
Video Features
All models contain the following video features:
FD Trinitron WEGA TV Velocity Modulation w/ control
Dynamic Focus Color Temperature Adjustment
Vertical Aperture
Compensation
Magnetic Quadra-pole
•All “FV” models use a 3D Digital Comb Filter.
•All “FS” models use a 3-line Digital Comb Filter.
•All “FV” models contain the Enhanced 16:9 Mode. The “FV26” con-
tain an Auto 16:9 Enhancement. This means these models have the
choice of Auto, ON or OFF, while the “FV16” models have the choice
of ON and OFF.
Convenience Features
All the AA2U models contain the following Convenience features:
Speed Surf Tuning Clock Timer (2 events)
Advanced On-screen Menu Sleep Timer (15/30/45/60/90)
Channel Label V Chip Parental Control
Video Label XDS/Closed Captioning
Multi Language Display Auto Channel Programming
Jump Channel Preset Program Palette
Favorite Channel or
Favorite Preview
Customer Tilt Control
•All models have 2 Tuner PIP except the KV-36FS12. The 2 Tuner
PIP has the Freeze Memo feature.
Input/Output
FS12 FS16 FV16 FV26
S Video Front/Rear 0/1 0/1 1/1 1/1
Composite Front/Rear 1/2 1/2 1/2 1/2
Component (Y/Pb/Pr) 1111
Fix/Var. Out Yes Yes Yes Yes
RF Inputs 1222
Monitor Output No No Yes Yes
S Link Control No No Yes Yes

3
Feature Glossary
Audio Features
Auto Mute –Mutes the audio output when the tuner receives no signal.
This keeps the loud volume from occurring due to static.
Auto SAP –If activated, Auto SAP automatically switches to the SAP
audio if it is present.
Steady Sound Auto Volume – Regulates the volume of the audio so
there are no sudden fluctuations.
SRS 3D –A digital signal-processing algorithm that simulates surround
sound using only two speakers.
Dynamic Acoustic Chamber (DAC) –A speaker enclosure that uses
the cabinet to improve sound quality.
Wireless IR Headphones – Wireless headphones are included with
“FV26”models.
Video Features
Dynamic Focus –Automatically adjusts the focus to improve focus on
certain parts of the screen.
Magnetic Quadra-pole –Controls the electron beam magnetically to
enhance picture resolution.
Trinitone Color Temperature Adjustment –Enables the user to adjust
the color temperature to warmer (redder) or cooler (bluer) in order to match
the program.
Enhanced 16:9 Mode - This mode uses vertical compression to enhance
“anamorphic”widescreen video from DVDs. The Auto Mode reads data
in the vertical blanking area to sense if the picture is 16:9. If it is, the set
will automatically switch to the vertical compression mode.
Velocity Modulation Scanning w/control - Sharpens the picture defini-
tion by varying the beam scanning rate to give every object a sharp, clean
edge. There are settings for High, Low and OFF.
Vertical Aperture Compensation - Sharpens picture definition and edge
detail on the vertical plane.
Y/Pb/Pr - Delivers optimum picture quality by supplying separate connec-
tions for luminance (Y), blue color difference (P B) and red color differ-
ence (P R ). Ideal for DVD players and Digital Television (DTV) set top
receiver/decoders.
3-line Comb Filter – Looks at the line above and below the line being
processed to separate the chroma and luminance in a composite video
signal. This reduces dot crawl to produce a better picture.
3D Comb Filter –Looks at the line above and below the line being pro-
cessed, along with the same three lines in the frame before and after to
optimally remove the chroma component from the Y in a composite video
signal. This reduces dot crawl and other noise to produce the best picture
possible.
Convenience Features
XDS (Extended Data Service) - Receives new information services that
some broadcasters are adding to their signals, including time, station call
letters, and programming information (where available).
Advanced On Screen Menu –A new, colorful on screen menu that is
more intuitive and easier to use.
Preset Program Palette –Picture types that are preset. These include
Vivid, Standard, Sports and Movie.
Freeze Memo –Allows you to save an item on the screen in the PIP
window while the main picture continues in real time.
V-Chip Parental Control - Allows parental control over rated television
programs.
Speed Surf Tuning - “Rapid Fire”channel change. Allows the viewer to
quickly scroll through channels.
Favorite Channel - Gives you fast one-button access for up to eight fa-
vorite channels.
Favorite Preview - In 2-tuner PIP Models, viewers can preview program-
ming on up to eight favorite channels in the PIP box while current channel
programming remains in the main picture.

4
A Board
C Board
WA Board
UY Board
AK Board
G Board
HX Board
HS Board
FS12 & FS16
A Board
C Board
WA Board
UX Board
AK Board
T Board
(FV26 ONLY)
G Board
HX Board
HB
Board
HA
Board
FV16 & FV26
Board Descriptions
Name
Description
ATuning Micon, Y/C Jungle, Tuner, Pincushion, H Deflection, V Deflection, H Deflection
AK Audio Amp, Surround Sound, Sub tuner, S-Link
CCRT Drive
GPower supply
HA Front A/V Inputs, Menu Buttons
HB IR detector
HS (FS12 and FS16 only) Front A/V Inputs, Menu Buttons, IR Detector
HX Buttons
T(FV26 Only) IR Headphones
UX(FV Only) 3D Comb Filter, A/V Switch, Audio Control, SRS, PIP Encode
UY(FS Only) 3 Line Comb Filter, A/V Switch, Audio Control, SRS 3D, PIP Encode (except FS12 model)
WA Velocity Modulation, Quadrapole

5
G BOARD
MAIN
P.S.
DGC DGC
POWER ON
AUDIO B+
9V
12V
135V
STANDBY
SUPPLY
POWER SUPPLY BLOCK
STANDBY
5V
Overall Block
G Board
The G board contains all of the power supplies, and the degaussing cir-
cuit. AC comes into the G board through the power cord to the previously
mentioned circuits.
The standby power supply creates the Standby 5 volts needed to power
the Tuning Micon, remote sensor and key inputs.
The Main Power Supply is turned ON by the Power On line. This signal
comes from the Tuning Micon to turn the set ON. The Main Power Supply
creates Audio B+, 9V, 12V and 135V.
The Tuning Micon turns ON the degaussing circuit immediately after the
set is powered up. The degaussing circuit feeds the AC line current to a
degaussing coil, which removes any magnetic fields that may have devel-
oped in the picture tube. It operates for about 3-4 seconds each time the
set is turned ON.
A/V Switching
The Video 1, 3 and 4 audio and video inputs are on the UX board. The
Video 2 A/V inputs are located on the HB Board. The signals are routed
to the UX board through the A board. The A/V input from the Main Tuner
on the A board and the A/V input from the Sub Tuner on the AK board are
also sent to the UX board. The UX board contains the A/V Switch. This
IC switches the appropriate audio and video signals to the audio and video
circuits.
Audio
The audio signal is routed from the UX board to the AK and T boards.
The AK board contains any audio processing, such as SRS or matrix
surround sound, and the audio amp. The audio amp drives the speakers.
The AK board also outputs signals for the Monitor Out and the Var./Fix
output.
The audio on the T board is modulated and amplified by the IR Amp. The
IR Amp outputs to an LED array for use with the external IR headphones.
Video
The composite and S video inputs are routed through the 3D Comb Filter.
The C output from the Comb Filter becomes Main C while the Y is sent
back to the A/V Switch and also sent to the ID 1 Decoder. An ID 1 De-
coder extracts data about the aspect ratio of a signal from the vertical
blanking area. The Y signal that is output from the A/V Switch becomes
Main Y.
The Main Y and C signals are output to the A board and then to the YCJ.
These signals are decoded to Y, R-Y and B-Y and are output to the YUV
SW. This IC is used to select either the Component video from the YCJ
or the component video from the Video 4 input. The Main Y signal is also
input to the Tuning Micon for V Chip decoding.
The selected signals are input to another YUV SW. This YUV switch
outputs either the main video signal or the main video signal mixed with
the PIP signal. These outputs are input to the E inputs of the YCJ. This
video is processed and output as RGB from the YCJ. The RGB signals
are sent to the C board where they are input to the CRT Drive. The CRT
Drive amplifies and inverts the signals and applies them to the picture
tube’s cathodes.

6
OVERALL BLOCK 11/8/00
MONITOR
OUT
VAR/FIX OUT
SUB
TUNER
AK BOARD
MAIN
TUNER
A BOARD
V4
COMPONENT
INPUT PIP
TUNING
MICON
ID 1
DECODER
3D
COMB
FILTER
YCJ
VIDEO
AMP
H
DEFLECTION
PIN FBT
QUADRA-
POLE
AUDIO
AMP
AUDIO
PROCESS LED ARRAY
YUV
SW
YUV
SW
IR
AMP
A/V SWITCH
RGB
IK
TO
QUADRAPOLE
OSD
MAIN C
VITM
MAIN
AUDIO
E
YUV
200V H
OUT
E/W
HV
SUB V
+12V
-15V
V
A
YUV
Y
VD
HP
HD
T BD.
A
A
V
A
A
V
L
R
HP
AK BD.
WA BD.
UX BD.
A BD.
C BD. YOKE
CRT
1CTV28 1274
C
Y/CV
MAIN Y
YUV YUV
FV26
ONLY
VP
SDA SCL
*V2 INPUT LOCATED ON FRONT PANEL
HB BOARD
**FV26
ONLY
VP
PROT
V
DEFLECTION
V1-V3*
COMPOSITE
OR S VIDEO

7
Deflection
Horizontal
When the set is turned ON and +9 volts is received by the YCJ, the YCJ
will output horizontal drive pulses. These pulses are amplified and output
to the horizontal yoke and FBT. The horizontal yoke uses the horizontal
output to control the beam scan across the face of the tube.
The FBT is used to create several voltages. They are High Voltage, 200
Volts, +12 and –15 volts, and ABL. The High Voltage, necessary for
beam acceleration, is connected to the second anode of the picture tube.
The 200 volts is used to power the video amp located on the C board.
The +12 and –15 volt lines are created to power the Vertical Deflection IC.
If these signals are missing, the set will indicate a vertical problem even
though the problem is actually in the horizontal or FBT section. The ABL
signal is input to the YCJ so that it can adjust the levels of the video signal
to keep the brightness at a consistent level.
The Horizontal Deflection circuit also returns a sample pulse, HP, to the
YCJ to ensure that the phase of the input and output is the same. The HP
signal is also input to the Quadra-pole circuit to create the signal needed
to shape the beam in the corners of the picture tube.
Pincushion
The pincushion correction is controlled by the E/W signal from the YCJ
when the horizontal drive pulses are output. This signal is a 60 Hz pa-
rabola signal that is used to dynamically widen the picture as the beam
scans from top to bottom. This signal also rides on a DC level, which is
used to maintain the overall width of the picture. This DC level is changed
using the HSIZ adjustment in the VP section of the service menu.
Vertical
The vertical drive signals are output from the YCJ when communications
are established between the Tuning Micon and the YCJ. These drive
signals are complementary, 180 degrees out of phase, and are sent to
the Vertical Output circuit.
There are two types of vertical drive signals used. One is for normal 4:3
aspect ratio video and the other is for 16:9 compressed video. The Verti-
cal Deflection circuit outputs the V Out signal to the vertical yoke. This
signal is used to control the up and down beam scan of the tube.
The Vertical deflection circuit also outputs the VP signal. The VP signal is
a sample of the pump-up pulse used to boost the B+ inside of the vertical
output IC. This signal is input to the YCJ for vertical protection and also to
the Quadra-pole circuit to create the necessary output to control the beam
shape at the corners of the tube.
The Vertical Interval Timing (VITM) signal from the YCJ is fed back to the
Tuning Micon to control the timing of the I2C bus. This ensures that I2C
data will only be sent during the vertical-blanking interval. If the VTIM
signal is missing, there will be no OSD and the PIP window will roll verti-
cally.
Quadra-pole Focus
Due to the flat screen in a set that uses a FD Trinitron tube, the focus in
the four corners of the set has changed. While the dots are still in focus at
the four corners, the spot of the beam has changed from round to ellipti-
cal. The Quadra-pole circuit is used to make these beam spots round.
The beam spots are made round again by supplying a signal to four coils
mounted on the yoke. The magnetic fields created by the signals applied
to the coils reshape the beam spots.
The VP and HP signals are samples of the output signals of the vertical
and horizontal deflection circuits. These signals are wave shaped to cre-
ate two differential parabola signals and applied to the four coils. Their
magnetic fields reshape the beam.