Sony Trinintron KV-XF21M31 User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-XF21M31 RM-952 New Zealand SCC-U26B-A
MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
SERVICE MANUAL BG-3S

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KV-XF21M31
RM-952
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/Bilingual system NICAM Stereo/Bilingual B/G; I: A2 Stereo/Bilingual (German) B/G
Teletext language English, Arabic, French
Channel coverage
B/G VHF: 1 to 11 / UHF: 21 to 69 / 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 S4, Z1 to Z39
MVHF: A2 to A13 / UHF:A14 toA79 /
CATV: A-8 toA-2, A to W+4, W+6 to W+84
˘(Antenna) 75-ohm external terminal
Audio output 5W + 5W
Number of terminal
D(Video) Input: 2 Output: 1 Phono jacks; 1 VP-P, 75 ohms
≥(Audio) Input: 2 Output: 1 Phono jacks; 500 mVrms
2(Headphone) Output: 1 Minijack
Picture tube 21 inch
Tube size (cm) 54 Measured diagonally
Screen size (cm) 51 Measured diagonally
Dimension (w/h/d, mm) 640 ×456 ×498
Mass (kg) 29
Design and specifications are subject to change without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODEDVIEWS AND INTHE
PARTS LIST ARE CRITICALTO 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 TOTHE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.

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KV-XF21M31
RM-952
TABLE OF CONTENTS
Section Title Page
SELF DIAGNOSIS FUNCTION................................ 4
1. GENERAL........................................................................ 8
2. DISASSEMBLY
2-1. Rear Cover Removal................................................ 21
2-2. Chassis Assy Removal ............................................. 21
2-3. F Board Removal ..................................................... 21
2-4. Service Position ....................................................... 21
2-5. Replacement of Parts ............................................... 22
2-5-1. Replacement of Control Button ....................... 22
2-5-2. Replacement of Light Guide ............................ 22
2-6. V1 Board Removal .................................................. 22
2-7. Terminal Bracket Removal ...................................... 22
2-8. Degauss Coil Removal............................................. 23
2-9. Picture Tube Removal.............................................. 23
3. SET-UP ADJUSTMENTS
3-1. Beam Landing .......................................................... 25
3-2. Convergence............................................................. 26
3-3. Focus Adjustment .................................................... 28
3-4. G2 (Screen) and White Balance Adjustments......... 28
4. CIRCUIT ADJUSTMENT
4-1. Adjustments with Commander ................................ 29
4-2. Adjustment Method ................................................. 30
4-3. Picture Quality Adjustments.................................... 35
4-4. A Board Adjustment After IC003 (Memory)
Replacement............................................................. 35
4-5. Picture Distortion Adjustment ................................. 36
Section Title Page
5. DIAGRAMS
5-1. Block Diagram ......................................................... 39
5-2. Frame Schematic Diagram ...................................... 42
5-3 Circuit Boards Location .......................................... 45
5-4. Schematic Diagrams and Printed Wiring Boards ... 46
(1) Schematic Diagram of A (1/2) Board...................... 47
(2) Schematic Diagram of A (2/2) Board...................... 51
(3) Schematic Diagrams of C5 and VM1 Boards ......... 58
(4) Schematic Diagram of V1 Board ............................ 63
(5) Schematic Diagram of F Board ............................... 65
5-5. Semiconductors........................................................ 67
6. EXPLODEDVIEWS
6-1. Chassis ..................................................................... 71
7. ELECTRICAL PARTS LIST....................................... 73

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KV-XF21M31
RM-952
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)
• IC1800 is shorted. (C5
board)
• -13V is not supplied. (A
board)
• IC 503 faulty (A board)
• IC 301 faulty (A board)
• G2 is improperly adjusted.
(Note 2)
• CRT problem.
• Video OUT IC1800 is faulty.
(C5 board)
• IC301 is faulty. (A board)
• No connection A board tox
C5 board.
• Discharge CRT (C5 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-XF21M31
RM-952
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-XF21M31
RM-952
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 "1" 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-XF21M31
RM-952
6. SELF-DIAGNOSTIC CIRCUIT
[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
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.
[ hite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.)
IC301
Y/CHROMA JUNGLE
FROM
CRT
FROM
[+B] Q604 C5
[V] Q509/507
IC001
SYSTEM IC003 MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
54521
18 51
4635

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KV-XF21M31
RM-952
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts
from the Operating Instruction Manual. The page numbers of
the Operating Instruction Manual remain as in the manual.
2
WARNING
• Dangerously high voltages are present inside the TV.
• Operate the TV only between 110 – 240 V AC.
To prevent fire or shock hazard, do not expose
the TV to rain or moisture.
Do not operate the TV if any liquid or solid object
falls into it. Have it checked immediately by
qualified personnel only.
Do not open the cabinet and the rear cover of the
TV. Refer servicing to qualified personnel.
Do not install the TV in hot, humid or excessively
dusty places.
Do not install the TV in a confined space, such
as a bookcase or built-in cabinet.
Do not block the ventilation openings of the TV.
Do not pull the power cord to disconnect the TV.
Pull it out by the plug.
Disconnect the power cord during lightning
storms or if you are not going to use the TV for
several days.
Install the TV in a stable position. Do not allow
children to climb onto it.
Do not plug in too many appliances to the same
power socket. Do not damage the power cord.
Clean the TV with a dry and soft cloth.
Do not use benzine, thinner, or any other chemicals
to clean the TV. Do not scratch the picture tube.
4
Using Your New TV
Getting Started
Step 1
Connect the antenna
If you wish to connect a VCR, see the “Connecting a VCR”diagram below.
Using Your New TV
IEC connector
(not supplied)
VCR
(yellow)
-L (MONO) (white)
-R (red)
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
: Signal flow
To antenna
output
Antenna cable
(not supplied)
Rear of TV
Rear of TV
Connecting a VCR
To watch the video, press …(see page 12).
or
: Signal flow
VIDEO
VIDEO IN
LR
VIDEO OUT
AUDIO
L(MONO)
1
To video and
audio outputs To …1
(video input)
To ˘
(antenna)

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KV-XF21M31
RM-952
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.
•When no signal is input to the connected video equipment, the TV screen
becomes blue.
Step 2
Note
•Do not use old batteries nor use different types of batteries together.
CAUTION
Do not connect the power cord until you have completed making all other
connections; otherwise a minimum leakage current might flow through the antenna
and other terminals to ground.
Insert the batteries
into the remote
Front of TV
ONE-PUSHAUTOMATIC PROGRAMING
1
1
ONE-PUSH AUTOMATIC PROGRAMMING
1
2
VHF LOW AUTO
Now You Are Ready. . .
To watch your TV, see page 11.
Step 3
Preset the channels automatically
Tips
•If you want to stop automatic channel presetting, press SELECT twice.
•If your TV has preset an unwanted channel or cannot preset a particular
channel, then preset your TV manually (see page 9).
6
Using Your New TV
Connecting optional components
You can connect optional audio/video components, such as a VCR, multi disc player,
camcorder, video game or stereo system.
To watch the picture of the connected equipment, press …(see page 12).
Connecting a camcorder/video game equipment
using the …(video input) jacks
Note
•You can also connect video equipment to the …1 (video input) jacks at
the rear of your TV.
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).
Front of TV
Camcorder
Video game
equipment
To video and
audio outputs
(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
: Signal flow
To…2
(video input)
To Ú
(monitor
output)
or
Audio/Video cable (not supplied)
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
or
L(MONO)
1
ONE-PUSHAUTOMATICPROGRAMING
2

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KV-XF21M31
RM-952
8
Using Your New TV
Presetting
channels
You can preset up to 100 TV channels in
numerical sequence from program
number 1 using the remote and the
buttons on your TV as well.
Presetting channels automatically
1
Press Uto turn on the TV.
2
Press AUTO PROGR.
To preset channels automatically from a specified program
number
(1) Press SELECT until “AUTO PROGRAM”appears.
(2) Press + or –.
The on-screen display will start flashing.
(3) Press PROGR +/–or the number buttons until the desired program number
appears.
(4) Press + or –.
u
Number buttons
SELECT
.+/–
PROGR +/–
+ or –
PIC MODE
VHF LOW AUTO
ONE-PUSHAUTOMATIC PROGRAMING
TV
123
46
789
÷0
5
JUMP
SOUND
MODE
FAVORITE
PROGR
Á
7
Using Your New TV
Using Your New TV
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 band to the TV stand and to the rear of
the TV using the provided hole.
or
B
Put the cord or chain through the clamps to secure the TV against a wall or
pillar.
Note
•Use only the supplied screws. Use of other screws may damage the TV.
20
mm
AB
3.8mm
or