Sony Trinitron KV-24FV10 User manual

SERVICE MANUAL BA-4C CHASSIS
MODEL COMMANDER DEST CHASSIS NO.
KV-24FV10 RM-Y168 US SCC-S22A-A
KV-24FV10 RM-Y168 CND SCC-S24A-A
KV-25FV10 RM-Y168 E SCC-S23A-A
KV-25FV10C RM-Y168 E SCC-S23C-A
MICROFILM
TRINITRON®COLORTV
RM-Y168KV-24FV10

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KV-24FV10/25FV10/25FV10C
SPECIFICATIONS
Television system
American TV standard/NTSC
Channel coverage
VHF:2-13/UHF:14-69/CATV:1-125
Visible screen size
24" picture measured diagonally
Actual screen size
25" picture measured diagonally
Antenna
75 ohm external terminal for VHF/UHF
Supplied Accessories
Remote Commander RM-Y168 (all models)
Size AA (R6) batteries (2)
Optional Accessories
Dipole antenna
Connecting cables VMC-810S/820S, VMC-720M,
YC-15V/30V, RK74A
U/V mixer EAC-66
Design and specifications are subject to change without notice.
( •) SRS (SOUND RETRIEVAL SYSTEM)
The ( •)SRS (SOUND RETRIEVAL SYSTEM) is
manufactured by Sony Corporation under license
from SRS Labs, Inc. It is covered by U.S. Patent No.
4,748,669. Other U.S. and foreign patents pending.
The word ‘SRS’ and the SRS symbol ( •) are
registered trademarks of SRS Labs, Inc.
BBE and BBE symbol are trademarks of BBE Sound,
Inc. and are licensed by BBE Sound, Inc. under U.S.
Patent No. 4,638,258 and 4,482,866.
KV-24FV10 KV-25FV10/10C
Power Requirements 120V, 60 Hz Auto Volt (120–220 VAC)
Number of inputs/outputs
Video Input
(1)
22
S Video Input
(2)
11
Audio Input
(3)
22
Audio Output
(4)
11
Speaker Output (W) 10W x 2 10W x 2
Power Consumption (W)
In Use (Max) 150W 150W
In Standby 1W 1W
Dimensions (W/H/D)
(mm) 652 x 524.3 x 467.3 mm 652 x 524.3 x 467.3 mm
(in) 25
3
/
4
x 20
11
/
16
x 18
7
/
16
in 25
3
/
4
x 20
11
/
16
x 18
7
/
16
in
Mass
(kg) 40 kg 40 kg
(lbs) 88 lbs. 3 oz. 88 lbs. 3 oz.
1)
1 Vp-p 75 ohms unbalanced, sync negative
2)
Y: 1 Vp-p 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
3)
500 mVrms (100% modulation), impedance: 47 kilohms
4)
More than 408 mVrms at the maximum volume setting (variable)
More than 408 mVrms (fix)

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KV-24FV10/25FV10/25FV10C
Section Title Page
Warnings and Cautions ...............................................................................................................................................................4
Self-Diagnostic Function .............................................................................................................................................................4
Safety Check Out Instructions.....................................................................................................................................................7
1. GENERAL........................................................................................................................................................... 8
2. DISASSEMBLY
2-1. Rear Cover Removal.....................................................................................................................................................14
2-2. A Board Removal ..........................................................................................................................................................14
2-3. Service Position ............................................................................................................................................................14
2-4. Picture Tube Removal ................................................................................................................................................... 15
3. SET-UP ADJUSTMENTS
3-1. Beam Landing ............................................................................................................................................................... 16
3-2. Convergence .................................................................................................................................................................17
3-3. Focus ............................................................................................................................................................................. 18
3-4. Screen (G2) ................................................................................................................................................................... 18
3-5. Method of Setting the Service Adjustment Mode ......................................................................................................... 19
3-6. White Balance Adjustments ..........................................................................................................................................19
4. SAFETY RELATED ADJUSTMENTS
4-1. R582 and R584 Confirmation Method (HV Hold-Down Confirmation and Readjustments) ...................................20
4-2. B+ Voltage Confirmation and Adjustment ..................................................................................................................... 20
5. CIRCUIT ADJUSTMENTS
5-1. Setting the Service Adjustment Mode ..........................................................................................................................22
5-2. Memory Write Confirmation Method .............................................................................................................................22
5-3. Adjustment Buttons and Indicators ...............................................................................................................................22
5-4. A Board Adjustments ....................................................................................................................................................25
6. DIAGRAMS
6-1. Block Diagram ............................................................................................................................................................... 29
6-2. Circuit Board Location...................................................................................................................................................32
6-3. Printed Wiring Boards and Schematic Diagrams .........................................................................................................32
• A Board .................................................................................................................................................................... 33
• G Board .................................................................................................................................................................... 41
• V Board .................................................................................................................................................................... 45
• C Board .................................................................................................................................................................... 46
6-4. Semiconductors ............................................................................................................................................................51
7. EXPLODED VIEW
7-1. Chassis.......................................................................................................................................................................... 52
8. ELECTRICAL PARTS LIST ................................................................................................................................................53
TABLE OF CONTENTS

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KV-24FV10/25FV10/25FV10C
WARNINGS AND CAUTIONS
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.
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED
DURING ANY SERVICE TO AVOID POSSIBLE SHOCK
HAZARD, BECAUSE OF LIVE CHASSIS. THE CHASSIS
OFTHISRECEIVER IS DIRECTLY CONNECTED TOTHE
AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
ONTHE SCHEMATIC DIAGRAMS, EXPLODED VIEWS,
AND IN THE PARTS LIST ARE CRITICAL FOR SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT
ARECRITICALFORSAFE OPERATIONAREIDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVERCRITICAL COMPONENTS ARE REPLACED
OR IMPROPER OPERATION IS SUSPECTED.
ATTENTION
APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER
L'ANODE DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU
CHASSIS METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE
PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE
CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN
CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT
ETRE UTILISÉ LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE
RÉCEPTEURESTDIRECTEMENTRACCORDÉÀL'ALIMENTATIONSECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE
SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES
LISTES DE PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA
SECURITE DU FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST INDIQUE DANS
LEPRESENTMANUELOUDANSDESSUPPLEMENTSPUBLIESPARSONY.
LESREGLAGES DE CIRCUITDONT L'IMPORTANCE ESTCRITIQUE POUR
LA SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE
PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE
REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN
MAUVAIS FONTIONNEMENT SUSPECTE.
SELF-DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to
flash. The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED
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.
DiagnosticTest Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If
there is more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnostic Item
Description
No. of Times
STANDBY/TIMER
LED Flashes
Self-diagnosticDisplay/
Diagnostic Result Probable Cause Location Detected Symptoms
Power does not turn on Does not light • Power cord is not plugged in.
• Fuse is burned out. (F600) (G Board) • Power does not come on. • No power is supplied to the TV.
• AC power supply is faulty.
+B overcurrent (OCP)* 2 times 2:0 or 2:1 • H.OUT (Q502) is shorted. (A Board)
• IC1751 is shorted. (C Board) • Power does not come on. • Load on power line isshorted.
Vertical deflection stopped* 4 times 4:0 or 4:1 • +13V is not supplied. (A Board)
• IC541 is faulty. (A Board) • Has entered standbystate afterhorizontal raster. • Vertical deflection pulse is stopped.
• Power line isshorted or power supply is stopped.
White balance failure
(not balanced) 5 times 5:0 or 5:1 • Video OUT (IC541) is faulty. (A Board)
• IC301 is faulty. (A Board)
• Screen (G2) is improperly adjusted.**
• No raster is generated.
• CRT cathode current detection reference
pulse output is small.
* 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.
** Refer to Screen (G2) Adjustments in Section 3-4 of this manual.

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KV-24FV10/25FV10/25FV10C
Display of Standby/Timer LED Flash Count
LED ON 0.3 sec.
LED OFF 0.3 sec. LED OFF
3 sec.
2 times
4 times
5 times
Diagnostic Item Flash Count*
+B overcurrent 2 times
Vertical deflection stopped 4 times
White balance failure 5 times
*One flash count is not used for self-diagnostic.
Stopping the Standby/Timer LED 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.
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 occurrences of failure on the screen for confirmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
Display Channel 5Sound volume
Note that this differs from entering the service mode (sound volume ).
Power ON
+
Self Diagnostic Screen Display
SELF DIAGNOSTIC
2:
3:
4:
5:
101:
N/A
N/A
0
0
0
1
0
Numeral “0” means that no fault was detected.
Numeral “1” means a fault was detected one time only.
STANDBY/TIMER LED

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KV-24FV10/25FV10/25FV10C
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 when the diagnostic screen is displayed,
as shown below:
ENTERChannel 8
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-diagnostic Circuit
IC301
Y/CHROMA JUNGLE IC541 V. OUT IC001 SYSTEM IC003 MEMORY
IK IN
FROM
CRT 21
HP/PROTECT
SDA
FROM
IC521
PIN 7 18
35 IO-SDATO-LED 37
REF 3I-PROTIO-BDAT
17 36 B-DAT
5
18 DISPLAY
+B overcurrent (OCP) Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage
of pin 18 of IC 301 is less than 1V 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 pin 17 of IC001. Power
supply will shut down when waveform interval exceeds 2 seconds.
White balance failure If the RGB levels* do not balance within 2 seconds after the power is turned on, 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 1K.)

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KV-24FV10/25FV10/25FV10C
After correcting the original service problem, perform the
following safety checks before releasing the set to the
customer:
1. Check the area of your repair for unsoldered or poorly
soldered connections. Check the entire board surface
for solder splashes and bridges.
2. Check the interboard wiring to ensure that no wires
are “pinched” or touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground
straps, and mounting hardware have been replaced.
Be absolutely certain that you have replaced all the
insulators.
4. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous
repair. Point them out to the customer and
recommend their replacement.
5. Look for parts which, though functioning, show
obvious signs of deterioration. Point them out to the
customer and recommend their replacement.
6. Check the line cords for cracks and abrasion.
Recommend the replacement of any such line cord
to the customer.
7. Check the B+ and HV to see if they are specified
values. Make sure your instruments are accurate;
be suspicious of your HV meter if sets always have
low HV.
8. Check the antenna terminals, metal trim, “metallized”
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
SAFETY CHECK-OUT
Leakage Test
The AC leakage from any exposed metal part to earth
ground and from all exposed metal parts to any exposed
metal part having a return to chassis, must not exceed
0.5 mA (500 microamperes). Leakage current can be
measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson
229 or RCA WT-540A. Follow the manufacturers'
instructions to use these instructions.
2. A battery-operated AC milliammeter.The Data
Precision 245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC voltmeter.
The “limit” indication is 0.75 V, so analog meters must
have an accurate low voltage scale. The Simpson’s
250 and Sanwa SH-63Trd are examples of passive
VOMs that are suitable. Nearly all battery-operated
digital multimeters that have a 2 VAC range are
suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-
plate retaining screw on most AC outlet boxes is also at
earth ground.If the retaining screw is to be used as your
earth ground, verify that it is at ground by measuring the
resistance between it and a cold-water pipe with an
ohmmeter.The reading should be zero ohms.If a cold-water
pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the
receptacle and the retaining screw.Try both slots, if
necessary, to locate the hot side on the line;the lamp
should light at normal brilliance if the screw is at ground
potential (see Figure B).
Figure B. Checking for earth ground.Figure A. Using an AC voltmeter to check AC leakage.

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KV-24FV10/25FV10/25FV10C
3
Connecting Your TV
Read this chapter before setting up your TV for the first time. This section
covers basic connections in addition to any optional equipment you may
be connecting.
Basic Connections
TV with indoor or outdoor antenna, or CATV cable
Depending on the cable available in your home, choose one of the
connections below:
✍ If you are connecting to an indoor or outdoor antenna, it will be necessary to
adjust the orientation of the antenna for best reception.
The instructions mentioned here are partial abstracts from the Operating Instruction Manual.
The page numbers shown reflect those of the Operating Instruction Manual.
4
User Guide
Connecting Additional Equipment
TV and VCR
1 Connect the coaxial cable from your TV antenna or cable TV to the IN
jack on your VCR.
2 Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF IN jack on the TV.
(Optional connection)
3 If your VCR is equipped with video inputs, for better picture quality
you should connect A/V cables from AUDIO and VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍ To watch video programs from your VCR, tune your TV to channel 3 or 4 (as
set on the rear of your VCR).
✍ For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, the audio cables must still be connected.
(Optional connection)
VCR
TV
2
1
3
From
Cable/antenna
SECTION 1 GENERAL

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KV-24FV10/25FV10/25FV10C
Connecting Your TV
5
TV and Cable Box
1 Connect the coaxial cable from the wall to the IN jack on your cable
box.
2 Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the VHF/UHF IN jack on the TV.
✍ To view channels from your cable box, tune your TV to channel 3 or 4 (as set
on the rear panel of your cable box).
✍ If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 20.
6
User Guide
TV, VCR, and Cable box
1 Connect the coaxial cable from the wall to the IN jack on your cable
box.
2 Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the IN jack on your VCR.
3 Connect a coaxial cable (not supplied) from the OUT jack on your
VCR to the VHF/UHF IN jack on the TV.
(Optional connection)
4 If your VCR is equipped with video inputs, for better picture quality
you should connect A/V cables from AUDIO and VIDEO OUT on
your VCR to AUDIO/VIDEO IN on your TV. You can use the
button to switch between the TV and VCR inputs.
✍ If you will be controlling all channel selection through your cable box, you
should consider using the CHANNEL FIX feature on page 20.
✍ For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, the audio cables must still be connected.
3
TV
Cable
4
(Optional connection)
Cable box
1
VCR
2

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KV-24FV10/25FV10/25FV10C
Connecting Your TV
7
TV and Digital Satellite Receiver
1 Connect the cable from your satellite antenna to SATELLITE IN on
the satellite receiver.
2 Attach the coaxial connector from your cable or antenna to
VHF/UHF on your TV.
3 Using A/V connectors, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your TV.
✍ You can use the button to switch between the satellite receiver and TV.
✍ For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, your audio connectors must still be
connected.
TV
Satellite receiver
Satellite
antenna
cable
1
2
3
From
cable/
antenna
8
User Guide
TV, Digital Satellite Receiver and VCR
1 Connect the cable from your satellite antenna to SATELLITE IN on
the satellite receiver.
2 Attach the coaxial connector from your cable or antenna to
VHF/UHF IN on your VCR.
3 Using a coaxial cable, connect VHF/UHF OUT on your VCR to
VHF/UHF on your TV.
4 Using A/V connectors, connect AUDIO and VIDEO OUT on your
satellite receiver to AUDIO and VIDEO IN on your VCR.
5 Using A/V connectors, connect AUDIO and VIDEO OUT on your
VCR to AUDIO and VIDEO IN on your TV.
✍ To view from the satellite or VCR, select the video input to which your
satellite receiver or VCR is connected by pressing on the remote
control.
Satellite receiver
4
5
2
3
1
Cable
TV
VCR
Satellite
antenna

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KV-24FV10/25FV10/25FV10C
Connecting Your TV
9
Connecting a Camcorder
Using A/V cables, connect AUDIO and VIDEO OUT on your camcorder
to AUDIO and VIDEO IN on your TV.
Connecting a DVD Player
Using A/V connectors, connect LINE OUT on your DVD to VIDEO IN
on your TV.
✍ For optimum picture quality, use S VIDEO instead of the yellow A/V cable.
S VIDEO does not provide sound, your audio connectors must still be
connected.
(Front A/V Panel)
A/V output
A/V outputs
(Rear of TV)
(Rear of DVD player)
10
User Guide
Connecting an audio system
Using audio connectors, connect AUDIO OUT on your TV to one of the
unused line inputs (e.g. TV, AUX, TAPE 2) on your stereo.
✍ Set your stereo to the chosen line input. See page 16 for additional audio
setup instructions.
AUDIO-L
AUDIO-R
Line
input
1
2

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KV-24FV10/25FV10/25FV10C
11
Using the Remote Control and
Basic Functions
This section shows you how to use more advanced buttons on the remote
control and how to use the on-screen menus.
Button Description
POWER Press when you want to turn
connected equipment on and off.
FUNCTION Press when you want to control
connected equipment with your
remote control.
MUTING Instantly turns off the sound.
Press again or press to restore
sound.
SYSTEM OFF Powers off all Sony equipment at
once.
TV/VIDEO Cycles through available video
inputs.
Moves the cursor in the on-
screen menus. Press the arrow
buttons to move the cursor, press
the center button to select or
access an option.
PICTURE MODE Cycles through the available
VIDEO MODE settings.
SLEEP Turns the TV off automatically in
approximately 30, 60 or 90
minutes.Cancel by pressing until
SLEEP OFF appears.
MTS/SAP Cycles through the Multi-
channel TV Sound (MTS)
options: STEREO, SAP (Second
Audio Programming), MONO.
DISPLAY Press once to show current time,
(if set) and channel number.
Press again to activate CAPTION
VISION settings, if available. To
cancel, press again until
DISPLAY OFF appears.
12
User Guide
Cycles through available AUTO
VOLUME settings (see page 16).
JUMP Alternates back and forth
between the last two channels
selected with the buttons.
GUIDE Brings up the custom guide of
your satellite receiver.
MENU Displays the on-screen menu.
Press again to exit the menu at
any time.
RESET Press to return to factory settings
while in the on-screen menu.
CODE SET Use to program your remote
control to operate connected
video equipment, (see page 29).
-
_
-

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KV-24FV10/25FV10/25FV10C
32
User Guide
Troubleshooting
If you are having a problem with your TV, try the suggestions below. If
the problem persists, contact your nearest Sony dealer.
No picture, no
sound ❏Make sure the power cord is plugged in.
❏If a red light is flashing on the front of your TV for
more than a few minutes, call your local service center.
❏Check your PARENTAL CONTROL settings, (pages
25-26).
❏Check the TV/VIDEO settings: when watching TV, set
to TV; when watching video equipment, set to VIDEO
(page 15).
❏Make sure the batteries have been inserted correctly
into the remote control.
❏Try another channel, it could be station trouble.
Poor or no
picture, good
sound
❏Adjust PICTURE in the VIDEO menu (page 15).
❏Adjust BRIGHTNESS in the VIDEO menu (page 15).
❏Check the antenna and/or cable connections (page 3).
Good picture,
no sound ❏Press so that MUTING disappears from the screen (page 11).
❏Check your AUDIO settings. Your TV may be set to
SAP (page 16).
No color ❏Adjust COLOR in the VIDEO menu (page 15).
Only snow
appears on the
screen
❏Check the CABLE setting in the SET UP menu
(page 20).
❏Check the antenna and/or cable connections (page 3).
❏Make sure the channel selected is currently
broadcasting.
Dotted lines or
stripes ❏Adjust the antenna.
❏Move the TV away from other electronic equipment.
Some electronic equipment can create electrical noise,
which can interfere with TV reception.
Double images
or ghosts ❏Check your outdoor antenna or call your cable service.
Cannot receive
higher number
channels(UHF)
when using an
antenna
❏Make sure CABLE is set to OFF in the SET UP menu
(page 20).
❏Use AUTO PROGRAM to add channels that are not
presently in the memory (page 20).
33
Other Information
If, after reading these operating instructions, you have additional questions related to the use of your
Sony television, please call our Direct Response Center at 1-800-222-SONY (7669) (U.S. residents
only). (416) 499-SONY (7669) (Canadian residents only).
Cable stations
don’t seem to
work
❏Make sure CABLE is set to ON in the SET UP menu
(page 20).
❏Use AUTO PROGRAM to add channels that are not
presently in the memory (page 20).
Remote
Control does
not operate
❏Batteries could be weak. Replace them (page 2).
❏Move the TV 3-4 feet away from fluorescent lights.
The TV needs
to be cleaned ❏Clean the TV with a soft dry cloth. Never use strong solvents such as thinner or benzine, which might
damage the finish of the cabinet.
Lost password
for PARENTAL
CONTROL
❏In the password screen, enter the following master
password: 4357. After using the master password, you
must create a new password.

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KV-24FV10/25FV10/25FV10C
SECTION 2
DISASSEMBLY
2-1. REAR COVER REMOVAL
2-2. A BOARD REMOVAL 2-3. SERVICE POSITION
Rear Cover
Seven Screws
(+BVTP 4x16)
Two Screws
(+BVTP 3x12)
C Board
A Board
G Board
V Board C Board
A Board
G Board
V Board

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KV-24FV10/25FV10/25FV10C
Coated
Earth
Ground
Strap
2-4. PICTURETUBE REMOVAL
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT even
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
a
REMOVAL PROCEDURES
HOW TO HANDLE AN ANODE CAP
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before
attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,
or carbon painted on the CRT.
1
Do not use sharp objects which may cause damage to the
surface of the anode cap.
3
Do not force turn the foot of the rubber cover. This may cause
the shatter-hook terminal to protrude and damage the rubber.
2
To avoid damaging the anode cap, do not squeeze the rubber
covering too hard. A material fitting called a shatter-hook terminal
is built into the rubber.
2
Use your thumb to pull the rubber
cap firmly in the direction indicated
by arrow
b .
3
When one side of the rubber cap
separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of arrow
c .
1
Turn up one side of the rubber cap in
the direction indicated by arrow
a .
b
Anode Button
c
ANODE CAP REMOVAL
G Board
A Board
Cushion
Degaussing Coil
Neck Assy.
Deflection Yoke
Anode Cap
C Board
Picture Tube
Tension Spring (B)
Tuner
V Board
Speaker
Speaker
Tapping Screw

— 16 —
KV-24FV10/25FV10/25FV10C
SECTION 3
SET-UP ADJUSTMENTS
3-1. BEAM LANDING
Before beginning adjustment procedure:
1. Degauss the entire screen.
2. Feed in the white pattern signal.
Adjustment Procedure
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw and set the
purity control to the center as shown below.
Purity Control
3. Turn the raster signal of the pattern generator to green.
4. Move the deflection yoke backward and adjust the purity
control so that green is in the center and red and blue are
at the sides evenly.
Blue Red
Green
5. Move the deflection yoke forward and adjust so that the
entire screen becomes green.
6. Switch over the raster signal to red and blue and confirm
the condition.
7. When the position of the deflection yoke is determined,
tighten it with the deflection yoke mounting screw.
8. If landing at the corner is not right, adjust by using the disk
magnets.
ba
cd
d
b
c
Purity control
corrects this area
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
Deflection yoke positioning
corrects these areas
a
The following adjustments should be made when
a complete realignment is required or when a new
picture tube is installed.
These adjustments should be performed with rated
power supply voltage unless otherwise noted.
Set the controls as follows unless otherwise noted.
VIDEO MODE: STANDARD
PICTURE control: ............... Normal
BRIGHTNESS control......... Normal
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Note: Test equipment required:
• Color bar pattern generator
• Degausser
• DC power supply
• Digital multimeter

— 17 —
KV-24FV10/25FV10/25FV10C
3-2. CONVERGENCE
Before starting convergence adjustments:
1. Perform FOCUS, V.LIN AND V.SIZE adjustments.
2. Set BRIGHTNESS control to minimum.
3. Feed in dot pattern.
Vertical Static Convergence
1. Adjust V.STAT magnet to converge red, green and blue
dots in the center of the screen. (Vertical movement adjust
V.STAT RV to converge.)
B
G
R
Center dot
R G B
V.STAT magnet
RV1750
V.STAT
2. Tilt the V.STAT magnet and adjust static convergence to
open or close the V.STAT magnet.
When the V.STAT magnet is moved in the direction of arrows
a and b, red, green, and blue dots move as shown below:
a
bbB
G
R
ab
B
G
R
aBGR
RGB
b
R
G
B
b
b
a
R
G
B
(1)
(3)
(2)
Horizontal Static Convergence
If the blue dot does not converge with the red and green dots,
perform the following:
1. Move BMC magnet (a) to correct insufficient H. Static
convergence.
2. Rotate BMC magnet (b) to correct insufficient V. Static
convergence.
3. After adjusting the BMC magnet, repeat Beam Landing
Adjustment.
PURITY
V. STAT
BMC MAGNET
b
a
BMC magnet
Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal
and Vertical Static ConvergenceAdjustment.
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence,
as shown below:
RGB BGR
RGB
R
R
R
G
B
G
B
G
B
RGB
BGR
R
G
BR
G
B
BGR RGB
4. Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.

— 18 —
KV-24FV10/25FV10/25FV10C
TLH Plate Adjustment
•Input crosshatch pattern
•Adjust PICTURE QUALITY to standard, PICTURE and
BRIGHTNESS to 50%, and OTHER to standard.
•Adjust the Horizontal Convergence of red and blue dots
by tilting the TLH plate on the deflection yoke.
TLH Plate
YCH
RV1750
V.STAT
XCV
C Board
V Board
TLV
(TLV)
B R R B
(R)(B) (B)(R) TLH+ TLH-
1. Adjust XCV core to balance X axis.
2. AdjustYCH VR to balanceY axis.
3. Adjust vertical red and blue convergence with V.TILT
(TLV VR.)
Perform adjustments while tracking items 1 and 2.
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the
misconverged areas.
ba
cd
a
b
d
a-d: screen-corner
misconvergence c
3-3. FOCUS
1. Adjust FOCUS control for best picture.
Focus (FV)
Screen (G2)
3-4. SCREEN (G2)
1. Input a dots pattern.
2. Set the PICTURE and BRIGHTNESS controls at minimum
and COLOR control at normal.
3. Adjust SBRT, GCUT, BCUT in service mode with an
oscilloscope as shown below so that voltages on the red,
green, and blue cathodes are 170VDC.
Pedestal
170 VDC
Ground
4. Observe the screen and adjust SCREEN (G2) VR in FBT
to obtain the faintly visible background of dot signal.

— 19 —
KV-24FV10/25FV10/25FV10C
3-5. METHOD OF SETTINGTHE SERVICE
ADJUSTMENT MODE
Service Mode Procedure
1. Standby mode (power off).
2.
Display Channel 5Sound volume Power
+
on the Remote Commander (press each button within a
second).
Service Adjustment Mode In
1. The CRT displays the item being adjusted.
SERVICE HSIZ 0
Disp.
(Item) Item Data
2. Press or on the Remote Commander to select the
item.
3. Press or on the Remote Commander to change the
data.
4. Press then to save into the memory.
Service Adjustment Mode Memory
Turn set off then on to exit service adjustment mode.
SERVICE WRITE Green
Red
MUTING
ENTER
3-6.WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal with burst.
2. Set to ServiceAdjustment Mode.
3. Set DCOL to “0”.
4. Set the PICTURE and BRIGHTNESS to minimum.
5. Adjust with SBRT if necessary.
6. Select GCUT and BCUT with and .
7. Adjust with and for the best white balance.
8. Set PICTURE and BRIGHTNESS to maximum.
9. Select GDRV and BDRV with and .
10.Adjust with and for the best white balance.
11.Reset DCOL to “1”.
12. To write into memory, press then .

— 20 —
KV-24FV10/25FV10/25FV10C
SECTION 4
SAFETY RELATED ADJUSTMENTS
4-1. R582 AND R584 CONFIRMATION
METHOD (HV HOLD-DOWN
CONFIRMATION) AND
READJUSTMENTS
The following adjustments should always be performed when
replacing the following components which are marked with
on the schematic diagram:
A BOARD: DY, CRT, C507, C520, C573, C574, C575,
D572, D573, D574, IC521, IC301, R578,
R579, R582, R583, R584, R585, R586,
R587, T504, T505
Preparation Before Confirmation
1. Using a Variac, applyAC input voltage: 120 ± 2 VAC
(or 120-220 ± 2 VAC for KV-25FV10/10C only.)
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and
BRIGHTNESS controls to maximum.
4. Confirm that the voltage between C574 (+) or TP503
and ground is more than 105 VDC.
Hold-down Operation Confirmation
1. Connect the current meter between Pin 11 of the FBT
(T505) and the PWB land where Pin 11 would normally
attach. (See Figure 1 on the next page.)
2. Input a dot signal and set PICTURE and BRIGHTNESS
to minimum: IABL = 100 ± 100 m A.
3. Confirm the voltage of A Board TP-600 is 135 ± 3 VDC.
4. Connect the digital voltmeter and the DC power supply
via diode 1SS119 to C574 (+) and ground. (See Figure 1
on the next page.)
5. Increase the DC power voltage gradually until the picture
blanks out.
6. Turn DC power source off immediately.
7. Read the digital voltmeter indication
(standard: 138.0 ± .3 VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS
to maximum: IABL = 1650 ± 100 m A.
9. Repeat steps 4 to 7.
Hold-down Readjustment
If the setting indicated in step 2 of Hold-down Operation
Confirmation cannot be met, readjustment should be performed
by altering the resistance value of R582 and/or R584
components marked with .
+
IABL
ABL
T505
FBT
range
-
ammeter
3.0 mA DC
A
4-2. B+VOLTAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed
when replacing the following components, which are marked
with on the schematic diagram on the G Board.
G BOARD: IC601, PH600
1. Using a Variac, apply AC input voltage: 130 ± 2 VAC
(or 120-220 ± 2 VAC for KV-25FV10/10C only.)
2. Input a dot signal.
3. Set the PICTURE and BRIGHTNESS controls to minimum.
4. Confirm that the voltage of A Board TP-600 is 135 ± 3 VAC.
5. If step 3 is not satisfied, replace the components listed
above, then repeat steps 1–3.