Sony KV-EF34M31 User manual

SERVICE MANUAL
CHASSIS BG-3S
MODEL COMMANDER DEST. CHASSIS NO. MODEL COMMANDER DEST. CHASSIS NO.
KV-EF34M31 RM-951 OCE SCC-N99A-A
KV-EF34M61 RM-951 GE SCC-U12D-A
KV-EF34M80 RM-951 ME SCC-U16E-A
KV-EF34M90 RM-951 HK SCC-U17C-A
KV-EF34M90 RM-951 JE SCC-P01A-A
KV-EF34M91 RM-951 ME SCC-U16D-A
TRINITRON ® COLORTV
MICROFILM

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KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
SPECIFICATIONS
Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, I, D/K, M
Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58
Stereo system NICAM Stereo B/G, I; A2 Stereo (German) B/G
Teletext language English, Arabic, French
Channel coverage
B/G VHF: E2 to E12 / UHF: E21 to E69 / CATV: S01 to S03, S1 to S41
IUHF: B21 to B68 / CATV: S01 to S03, S1 to S41
D/K VHF: C1 to C12, R1 to R12 / UHF: C13 to C57, R21 to R60
CATV: S01 to S03, S1 to S41, Z1 to Z39
MVHF: A2 to A13 / UHF: A14 to A79 /
CATV: A-8 to A-2, A to W+4, W+6 to W+84
˘(Antenna) 75-ohm external terminal
Audio output (Speaker) 15W + 15W*
Number of terminal
D(Video) Input: 4 Output: 1 Phono jacks; 1 Vp-p, 75 ohms
≥(Audio) Input: 4 Output: 1 Phono jacks; 500 mVrms
(S Video) Input: 2 Y : 1 Vp-p, 75 ohms,
unbalanced, sync negative
C : 0.286 Vp-p, 75 ohms
(Component Input: 1 Phone jacks
Video) Y : 1 Vp-p, 75 ohms, sync negative
CB: 0.7 Vp-p, 75 ohms
CR: 0.7 Vp-p, 75 ohms
Audio : 500 mVrms
2(Headphones) Output: 1 Stereo minijack
Picture tube 34 inch
Tube size (mm) 859 Measured diagonally
Screen size (mm) 800 Measured diagonally
Dimension (w/h/d, mm) 859 ×660.5 ×573.5
Mass (kg) 83
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWSAND 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.
CAUTION
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.
* 10% distortion
Design and specifications are subject to change without notice.

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KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
TABLE OF CONTENTS
Section Title Page
SELF DIAGNOSIS FUNCTION............................... 4
1. GENERAL ....................................................................... 8
2. DISASSEMBLY
2-1. Rear Panel Removal ................................................ 30
2-2. Speaker Box Removal............................................. 30
2-3. Chassis Assy Removal ............................................ 30
2-4. Service Position ....................................................... 30
2-5. D1 and DH Boards Removal .................................. 31
2-6. J1 Board and RF Splitter Removal ......................... 31
2-7. V1 and P Boards Removal ...................................... 32
2-8. A and B Boards Removal........................................ 32
2-9. H1 Board Removal.................................................. 32
2-10. Demagnetization Coil Removal .............................. 32
2-11. Top Switch Removal ............................................... 33
2-12. Picture Tube Removal ............................................. 33
3. SET-UP ADJUSTMENTS
3-1. Beam Landing Adjustment...................................... 35
3-2. Convergence Adjustment ........................................ 36
3-3. Focus Adjustment .................................................... 38
3-4. Neck Assy Twist Adjustment .................................. 38
3-5. G2 (Screen) and White Blance Adjustment............ 39
4. CIRCUIT ADJUSTMENTS
4-1. Adjustments with Commander ............................... 40
4-2. Adjustment Method ................................................. 41
4-3. Picture Quality Adjustments ................................... 48
4-4. A Board Adjustment After IC003 (Memory)
Replacement ............................................................ 49
4-5. Picture Distortion Adjustment................................. 50
Section Title Page
5. DIAGRAMS
5-1. Block Diagrams ....................................................... 51
5-2. Frame Schematic Diagram ...................................... 61
5-3 Circuit Boards Location .......................................... 65
5-4. Schematic Diagrams and Printed Wiring Boards ... 65
(1) Schematic Diagram of A Board .............................. 66
(2) Schematic Diagram of B Board .............................. 77
(3) Schematic Diagram of P Board............................... 85
(4) Schematic Diagrams of D2 and J1 Boards ............ 91
(5) Schematic Diagrams of H1 and F Boards .............. 95
(6) Schematic Diagrams of DH and VM2 Boards ....... 99
(7) Schematic Diagrams of C and B4 Boards .............. 103
(8) Schematic Diagram of V1 Board ............................ 107
5-5. Semiconductors ....................................................... 110
6. EXPLODEDVIEWS
6-1. Picture Tube ............................................................. 112
6-2. Chassis ..................................................................... 113
7. ELECTRICAL PARTS LIST...................................... 114

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KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
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)
• H.OUT Q511 is shorted. (A
board)
• IC701 is shorted. (C board)
• -13V is not supplied. (A
board)
• IC 503 faulty (A board)
• G2 is improperly adjusted.
(Note 2)
• CRT problem.
• Video OUT IC701 is faulty.
(C board)
• IC301 is faulty. (A board)
• No connection A board to C
board.
• Discharge CRT (C 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-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
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-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
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
002 : 000
003 : 000
004 : 000
005 : 001
Numeral "0" means that no fault has been detected.
Numeral "I" means a fault has been detected.
101 : 000
SELF DIAGNOSTIC
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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KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
6. SELF-DIAGNOSTIC CIRCUIT
[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q604(A board). If
Q604(A board) go to ON and the voltage to pin 18 of IC301(A board) should go down
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
[Horizontaldeflectionoverdrive] Occurs when an overdrive on H drive line is detected by D526(A board). Power supply
will be shut down when detect it.
[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Q509(A board)
and IC001(A board) shut down the power supply.
[Verticaldeflectionovercurrent] Occurs when an overcurrent on V drive line is detected by Q507(A board). Power supply
will be shut down when detect this by IC001(A board).
[Whitebalancefailure] If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301(A board). 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 C
[H] D526
[V] Q509/507
IC001
SYSTEM IC003 MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
54521
18 51
4635

– 8 –
SECTION1
GENERAL The operating instructions mentioned here are partial abstracts from the
Operating Instruction Manual. The page numbers of the Operating In-
struction Manual remein as in the manual.
4
Using Your New TV
VIDEO
VIDEO IN
VIDEO OUT
AUDIO
123
L (MONO)
R
Getting Started
Step 1
Connect the antenna
If you wish to connect a VCR, see the “Connecting a VCR” diagram below.
CAUTION
Do not connect the power cord until all other connections are complete;
otherwise, a minimal current leakage through the antenna and/or other
terminals to the ground could occur.
Connecting a VCR
To play a video tape, see page 10.
Using Your New TV
IEC connector
(not supplied)
To video and
audio outputs
VCR
(yellow)
-L (MONO) (white)
-R (red)
To S video
output
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
S video cable
(not supplied)
: Signal flow
To
(S video input)
To antenna
output To ˘
(antenna)
or
: Signal flow
Antenna cable (not supplied)
Antenna cable
(not supplied)
5
Using Your New TV
Using Your New TV
Notes
• If you connect a monaural VCR, connect the yellow plug to (the
yellow jack) and the black plug to -L (MONO) (the white jack).
• If you connect a VCR to the ˘(antenna) terminal, preset the signal
output from the VCR to the program number 0 on the TV.
• Do not have concurrent connections of video equipment to the …3 (video
input) jacks at the front and the …3 (video input) jacks at the rear of your
TV; otherwise, the picture will not be displayed properly on the screen.
• When both the (S video input) and …1 (video input) are connected,
the ␣ (S video input) is automatically selected. To view the video input
to …1 (video input), disconnect the S video cable.
Step 2
Insert the batteries
into the remote
Note
• Do not use old batteries or different types of batteries together.
Step 3
Preset the channels automatically
Tip
• To stop the automatic channel presetting, press MENU twice.
Now You Are Ready. . .
The channels are now automatically preset
in your TV. To preset the channels manually,
see page 37.
1
2
AUTO
PROGR
1
ONE-PUSH AUTOMATIC PROGRAMMING
AUTO PROGRAM
01
TV SYS :AUTO
VHF LOW
PR:

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6
Using Your New TV
3
(MONO)
123
L (MONO)
R
Connecting optional components
You can connect optional audio/video components, such as a VCR, multi disc player,
camcorder, video game, or stereo system. For operations of the connected equipment,
see pages 10 and 25.
Connecting a camcorder/video game equipment
using the …(video input) jacks
Notes
• You can also connect video equipment to the …1, 2, or 3 (video input)
jacks at the rear of your TV.
• Do not have concurrent connections of video equipment to the …3
(video input) jacks at the front and the …3 (video input) jacks at the rear
of your TV; otherwise, the picture will not be displayed properly on the
screen.
• When both the (S video input) and …1 (video input) are connected,
the ␣ (S video input) is automatically selected. To view the video input
to …1 (video input), disconnect the S video cable.
Connecting audio/video equipment using the Ú
(monitor output) jacks
Note
• When connecting a monaural VCR, connect the yellow plug to (the
yellow jack) and the black plug to -L (MONO) (the white jack).
To S video output
Front of TV
Camcorder
Video game
equipment
To video and
audio outputs
: Signal flow
To
(S video
input)
To … 3
(video input)
or
Audio/Video cable (not supplied)
S video cable (not supplied)
(yellow)
-L (MONO)
(white)
-R (red)
Rear of TV
To
antenna
output
To video and
audio inputs
or
Audio system
To
audio
inputs
VCR
: Signal flow
To Ú
(monitor
output)
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
or
7
Using Your New TV
Using Your New TV
VIDEO
R-AUDIO-L
LINE OUT
123
L (MONO)
R
Notes
• Some DVD player terminals may be labeled differently:
• Since the high quality pictures on a DVD disc contain a lot of information,
picture noise may appear. In this case, adjust the sharpness (“SHARP”) in the
PERSONAL ADJUST menu of the PICTURE MODE menu (see page 30).
• Connect your DVD player directly to your TV. Connecting the DVD player
through other video equipment will cause unwanted picture noise.
DVD player
Audio/Video cable
(not supplied)
DVD player
To
L (white)
R (red)
Audio cable
(not supplied)
To component
video output
Component
video cable
(not supplied)
(yellow)
-L (MONO) (white)
-R (red)
To …1, 2, or 3
(video input)
: Signal flow
To audio
output
: Signal flow
To
(component
video input)
Connect To (on the DVD player)
Y (green) Y
C B (blue) C
b , B-Y or P B
C R (red) C
r , R-Y or P R
Connecting a DVD player
Connect …1, 2, or 3 (video input) / (audio/video) connectors on your TV to
LINE OUT on your DVD player.
Connecting a DVD player with component video
output connectors
1 Connect R and L under (component video input) on your TV to the LINE OUT,
AUDIO R and L output connectors on your DVD player.
2 Using a component video cable, connect Y, CB, and CRunder (component video
input) on your TV to the COMPONENT VIDEO OUT Y, CB, and CRoutput
connectors on your DVD player.
VIDEO
R-AUDIO-L
LINE OUT
Y
COMPONENT VIDEO OUT
S VIDEO OUT
C B C R
R L Y C B
C R

– 10 –
8
Using Your New TV
20
mm
AB
3.8mm
Securing the TV
To prevent the TV from falling, secure the TV using one of the following methods:
A
With the supplied screws, attach the stabilizer band to the TV stand and to
the rear of the TV using the provided hole.
OR
B
Pass a cord or chain through the clamps and secure them to the rear of the
TV and a wall or pillar.
Note
• Use only the supplied screws. Use of other screws may damage the TV.
OR
9
Using Your New TV
Using Your New TV
Number buttons
PROGR +/–
continued
123
456
78
0
-/--
9
u
231
564
897
0
JUMP
- / --
PIC MODE
PROGR
A/B
MENU
PIP PROGR
ZOOM
IN
LEFT
FAVORITE PROGR
INDEX
ZOOM
IN
RIGHT
SURROUND
SOUND
MODE
PIP PROGR
VIDEO
TITLE
ENTER
Watching the TV
This section explains various functions
and operations used while watching the
TV. Most operations can be done using
the remote.
1
Press Uto turn on the TV.
When the TV is in standby
mode (the u/Â/
indicator on the TV is lit
red), press uon the remote
or on the TV.
The PROGR +/–, .+/–,
and …indicators on the
TV light up.
2
Press PROGR +/– or the
number buttons to select
the TV channel.
For double digit numbers,
press ÷, then the number
(e.g., for 25, press ÷, then
2 and 5).