Sony KV-XA21M93 User manual

MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
SERVICE MANUAL BG-3R
MODEL COMMANDER DEST. CHASSIS NO.
KV-XA21M93 RM-952 Hong Kong SCC-U50A-A
TV
123
46
789
÷0
5
JUMP
SOUND
MODE
FAVORITE
PROGRÁ

–2 –
KV-XA21M93
RM-952
SPECIFICATIONS
Note
Power requirements 220-240 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
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) 5W + 5W (TWEETER supplied) 10% distortion
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(Headphones) 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 x 456 x 498
Mass (kg) 26
Design and specifications are subject to change without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND 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.

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KV-XA21M93
RM-952
TABLE OF CONTENTS
Section Title Page
SELF DIAGNOSIS FUNCTION ................................ 4
1. GENERAL ........................................................................ 7
2. DISASSEMBLY
2-1. Rear Cover Removal ................................................ 20
2-2. Speaker Removal ..................................................... 20
2-3. Chassis Assy Removal ............................................. 20
2-4. F Bracket Removal .................................................. 20
2-5. J2 Board and Terminal Bracket Removal................ 20
2-6. Service Position ....................................................... 20
2-7. Replacement of Parts ............................................... 21
2-7-1 Replacement of Light Guide .............................................. 21
2-7-2 Replacement of Power Button ........................................... 21
2-8. Picture Tube Removal .............................................. 21
3. SET-UP ADJUSTMENTS
3-1. Beam Landing .......................................................... 23
3-2. Convergence Adjustment ......................................... 24
3-3. Focus Adjustment .................................................... 26
3-4. G2 (Screen) and White Balance Adjustments ......... 27
4. CIRCUIT ADJUSTMENTS
4-1. Adjustments with Commander ................................ 28
4-2. Adjustment Method ................................................. 28
4-3. Picture Quality Adjustments .................................... 33
4-4. Deflection Adjustment ............................................. 33
4-5. A Board Adjustment After IC003
(memory) Replacement ........................................... 33
4-6. Picture Distortion Adjustment ................................. 34
Section Title Page
5. DIAGRAMS
5-1. Block Diagram .......................................................... 35
5-2. Circuit Board Location ............................................. 37
5-3. Schematic Diagrams ................................................. 38
(1) Schematic Diagrams of F, J2 and C1 Boards ..... 39
(2) Schematic Diagram of A Board .......................... 41
5-4. Voltage Measurements .............................................. 57
5-5. Waveforms ................................................................ 60
5-6. Printed Wiring Boards and Parts Location ............... 61
5-7. Semiconductors ......................................................... 65
6. EXPLODED VIEWS
6-1. Picture Tube .............................................................. 67
6-2. Chassis ...................................................................... 68
7. ELECTRICAL PARTS LIST...................................... 69

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KV-XA21M93
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. DIAGNOSTIC TEST 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
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.
* IC700 out is faulty (C1 board).
SELF DIAGNOSTIC FUNCTION
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)
•IC700 is shorted (C1 board)
•-13V is not supplied. (A
board)
•IC 503 faulty (A board)
•G2 is improperly adjusted.
(Note 2)
•CRT problem.
•IC700 out is faulty
(C1 board)
•IC301 is faulty. (A board)
•No connection A board to
C1 board.
•Discharge CRT (C1 Board)
•Static discharge
•External noise

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KV-XA21M93
RM-952
2. DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT
3. STOPPING THE 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.
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
STANDBY/SLEEP lamp
Lamp ON 0.3 sec.
Lamp OFF 3 sec.
Lamp OFF 0.3 sec.
2 times
3 times
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.
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

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KV-XA21M93
RM-952
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.
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
[V] Q509/507
IC001
SYSTEM
IC003
MEMORY
IK-IN
MP/
PROTECT O-LED
IO-8DAT B-DAT
IO-SDAT
521
18 51
46
SDA 35
FROM
[+B] Q604 C6
45

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KV-XA21M93
RM-952
SECTION 1
GENERAL
2
WARNING
• Dangerously high voltages are present inside the TV.
• Operate the TV only between 110 – 240 V AC. (For Hong Kong only: 220 – 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 as high voltages and other hazards are
present inside the TV. Refer servicing and
disposal of the TV to qualified personnel.
Your TV is recommended for home use only.
Do not use the TV in any vehicle or where it may
be subject to excessive dust, heat, moisture or
vibrations.
Do not block the ventilation openings of the TV.
Do not install the TV in a confined space, such
as a bookcase or built-in cabinet.
For children’s safety, do not leave children alone
with the TV. 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.
For your own safety, do not touch any part of the
TV, the power cord and the antenna cable during
lightning storms.
Pull the power cord out by the plug. Do not pull
the power cord itself. Disconnect the TV before
moving it or if you are not going to use it for
several days.
3
GB
Using Your New TV
Do not install the TV in an unstable position.
Use a proper TV stand. Do not place any objects on the TV.
WARNING (continued)
The operating instruction mentioned here are partial abstracts
from the Operating Instruction Manual.The page numbers of
the Operating Instruction Manual remain as in the manual.

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KV-XA21M93
RM-952
Using Your New TV
5
Using Your New TV
Step 2
Note
•Do not use old batteries nor use different types of batteries together.
Front of 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 8(antenna) terminal, preset the signal
output from the VCR to the program number 0 on the TV.
•When no signal is input from the connected video equipment, the TV
screen becomes blue.
(Not used for this model)
•Do not connect video equipment to the t2 (video input) jacks at the
front and the rear of your TV at the same time; otherwise the picture will
not be displayed properly on the screen.
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.
•To avoid battery leakage and damage to the remote, remove the batteries
from the remote if you are not going to use it for several days. If any
liquid that leaks from the batteries touches you, immediately wash it
away with water.
Insert the batteries
into the remote
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 11).
Note (Not used for this model)
•During automatic channel presetting, your TV screen will indicate
“B/G”, “I”, “D/K”or “M”for the TV system.
AUTO
PROGR
1
1
VHF LOW AUTO
1
2
2
L(MONO) R
PROGR
SELECT AUTO
PROGR
!
Using Your New TV
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)
To video
and audio
outputs
(yellow)
-L (MONO) (white)
-R (red)
Audio/Video cable (not supplied)
Rear of TV
Connecting a VCR
To watch the video input, press t(see page 14).
(Not used for this model)
: Signal flow
: Signal flow
or Antenna cable
(not supplied)
Antenna cable
(not supplied)
(yellow)
-L (MONO) (white)
-R (red)
To video
and audio
outputs Audio/Video cable (not supplied)
To t1 (video input)
To 8(antenna)
To antenna output
: Signal flow
VCR
Antenna cable (not supplied)
To antenna output
VCR
To
t
1 or 2 (video input)
Rear of TV
Rear of TV
L(MONO)R
RL
VIDEO IN
VIDEO OUT
VIDEO
AUDIO
1
VIDEO
VIDEO IN
VIDEO OUT
AUDIO
RL
To 8(antenna)
KV-XA21M93

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KV-XA21M93
RM-952
Using Your New TV
6
Connecting the TWEETER
You can enjoy high quality sound by connecting the TWEETER.
Connect the wires to the TWEETER terminals at the rear of your TV. The
plain wire should be connected to the 3red terminal and the striped wire
to the #black terminal.
Notes
•Connect only the supplied TWEETER; otherwise your TV may
malfunction.
•Unplug your TV from the wall outlet when connecting the TWEETER.
•To prevent a malfunction caused by a short circuit of the terminals, make
sure that none of the TWEETER wire strands stick out, making contact
with it’s neighbouring TWEETER terminal.
Rear of TV
Striped
wire
Plain
wire
TWEETER (8 )
– +
WOOFER(8 )
– +
TWEETER
Using Your New TV
7
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 video input of the connected equipment, press t(see page 14).
Connecting a camcorder/video game equipment
using the t(video input) jacks
Notes
(Not used for this model)
•You can also connect video equipment to the t1 (video input) jack at
the rear of your TV.
KV-XG29M50 only
•You can also connect video equipment to the t1 or 2 (video input) jacks
at the rear of your TV.
•Do not connect video equipment to the t2 (video input) jacks at the
front and the rear of your TV at the same time; otherwise the picture will
not be displayed properly on the screen.
Connecting audio/video equipment using the T
(monitor output) jacks
(Not used for this model)
Front of TV
Camcorder
Video game
equipment
To video and
audio outputs
: Signal flow
To
t
2
(video input)
or
Audio/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
Antenna cable (not supplied)
Audio/Video cable
(not supplied)
L(MONO)R
2
L(MONO) R
PROGR
SELECT AUTO
PROGR
2
21
L(MONO)
R
continued
To T
(monitor
output)
KV-XA21M93
(Not used for this model)

–10 –
KV-XA21M93
RM-952
Using Your New TV
8
Note
•If you connect a monaural VCR, connect the yellow plug to (the yellow
jack) and the black plug to -L (MONO) (the white jack).
KV-XA21M93/XA21M80/XA21M61/XA21M50
(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 T
(monitor output)
Antenna cable (not supplied)
Audio/Video cable (not supplied)
L(MONO)
R
1
Connecting optional components (continued)
Using Your New TV
9
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
3.8 mm
or
AB