Sony TRINITRON KV-AR25M81A User manual

REVISION HISTORY BG3R
MODEL
KV-AR25M81A
PA RT N O. : 9-872-347-01
NO. SUFFIX DATE SUPP / CORR DESCRIPTION
CHASSIS
1 -01 2002/11 -- 1st. Issue

MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
SERVICE MANUAL BG3R
MODEL COMMANDER DEST. CHASSIS NO.
KV-AR25M81A RM-952 Pakistan

–2 –
KV-AR25M81A
RM-952
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, NTSC3.58, NTSC4.43
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) 5W + 5W
Number of terminal
DVideo Input: 3* Output: 1 Phono jacks; 1 Vp-p, 75 ohms * Two input lines available
≥Audio Input: 3* Output: 1 Phono jacks; 500 mVrms * Two input lines available
(S Video) Input : 1 Y: 1 Vp-p, 75 ohms,
unbalanced, sync negative
C: 0.286 Vp-p, 75 ohms
(Component Input : 1 Phono 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: 500mVrms
2(Headphone) Output: 1 Stereo minijack
Picture tube 25 in.
Tube size (cm) 64 Measured diagonally
Screen size (cm) 60 Measured diagonally
Dimension (w/h/d,mm) 650 ×517 ×496
Mass (kg) 39
Design and specifications are subject to change without notice.
SPECIFICATIONS
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND INTHE
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.
Note

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KV-AR25M81A
RM-952
TABLE OF CONTENTS
SELF DIAGNOSTIC FUNCTION ........................................4
1. DISASSEMBLY
1-1. Rear Cover Removal ................................................... 7
1-2. Speaker Block Assy Removal ..................................... 7
1-3. Chassis Assy Removal ................................................ 7
1-4. Service Position .......................................................... 7
1-5. Terminal Bracket and J Board Removal .................... 7
1-6. V1 Board Removal ..................................................... 7
1-7. H1 and H2 Boards Removal ....................................... 8
1-8. A and B9 Boards Removal ......................................... 8
1-9. Picture Tube Removal ................................................. 8
2. SET-UP ADJUSTMENTS
2-1. Beam Landing ........................................................... 10
2-2. Convergence .............................................................. 11
2-3. Focus Adjustment ..................................................... 13
2-4. G2 (SCREEN) and White Balance Adjustment ....... 14
3. CIRCUIT ADJUSTMENTS
3-1. Adjustment With Commander .................................. 15
3-2. Adjustment Method .................................................. 15
3-3. Picture Quality Adjustments ..................................... 21
3-4. Deflection Adjustments ............................................ 21
3-5. H-Trapezoid Adjustment .......................................... 22
3-6. A Board Adjustment After IC003 (MEMORY)
Replacement .............................................................. 22
3-7. Picture Distortion Adjustment .................................. 23
Section Title Page Section Title Page
4. DIAGRAMS
4-1. Block Diagram .......................................................... 24
4-2. Circuit Board Location ............................................. 26
4-3. Schematic Diagram ................................................... 27
(1) A Board Schematic Diagram .............................. 28
(2) B9 Board Schematic Diagram ............................ 32
(3) V1 Board Schematic Diagram ............................ 34
(4) C6 Board Schematic Diagram ............................ 36
(5) H1 Board Schematic Diagram ............................ 38
(6) H2 Board Schematic Diagram ............................ 40
(7) J Board Schematic Diagram ............................... 41
(8) VM1 Board Schematic Diagram ........................ 42
4-4. Voltage List and Waveforms ..................................... 43
4-5. Printed Wiring Boards and Parts Location ............... 47
4-6. Semiconductors ......................................................... 52
5. EXPLODED VIEWS
5-1. Speaker Block ........................................................... 54
5-2. Chassis ...................................................................... 55
5-3. Picture Tube .............................................................. 56
6. ELECTRICAL PARTS LIST......................................... 57
INSTRUCTION MANUAL

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KV-AR25M81A
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”.
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 2-4 of this manual.
* R(Q703), G(Q702) or B(Q701) out is faulty (C6 board).
SELF DIAGNOSTIC FUNCTION
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.
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)
•Q701, Q702, Q703 is
shorted (C6 board)
•-13V is not supplied.
(A board)
•IC 503 faulty (A board)
•G2 is improperly adjusted.
(Note 2)
•CRT problem.
•R(Q703), G(Q702) or
B(Q701) out is faulty
(C6 board)
•IC301 is faulty. (A board)
•No connection A board to
C6 board.
•Discharge CRT (C6 Board)
•Static discharge
•External noise

–5 –
KV-AR25M81A
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 DIPLAY
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
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.
2 times
5 times
Lamp ON 0.3 sec.
Lamp OFF 0.3 sec. Lamp OFF 3 sec.
002 : 000
003 : 000
004 : 000
005 : 001
101 : 000
SELF DIAGNOSTIC
Numeral "0" means that no fault has been detected.
Numeral "1" means a fault has been detected.
STANDBY/SLEEP lamp

–6 –
KV-AR25M81A
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-DIANOSTIC 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

–7 –
KV-AR25M81A
RM-952
SECTION 1
DISASSEMBLY
1-1. REAR COVER REMOVAL 1-2. SPEAKER BLOCK ASSY REMOVAL
1-3. CHASSIS ASSY REMOVAL
1Nine screws
(+BVTP 4 × 16)
2Rear cover
1Four screws
(Washer head)
(+P 4×16 )
2Speaker Block Assy
1-4. SERVICE POSITION
1-6. V1 BOARD REMOVAL
1-5. TERMINAL BRACKET AND J BOARD
REMOVAL
3J Board
4Two screw
(+BVTP 3 × 12)
5Terminal bracket
2Two screws
(+BVTP 3 × 12)
1One screw
(+BVTP 4 × 16)
6Two Hooks
2V1 Board
1Two claws

–8 –
KV-AR25M81A
RM-952
1-9. PICTURE TUBE REMOVAL
Note:
•Please make sure the TV set is not in standing position before removing necessary CRT support located on bottom
right and left.
1) Place the TV set with the CRT face down on a cushion jig.
2) Removal the rear cover.
3) Removal the Speaker Block Assy.
1-8. A AND B9 BOARDS REMOVAL1-7. H1 AND H2 BOARDS REMOVAL
5Cover, H
6H2 Board
4Two hooks
3Four hooks
3H1 Board
1Two screws
(Washer head)
(+BVTP 3 x 12)
5A Board
4B9 Board
1One screw
(Washer head)
(+BVTAP 3 x 12)
2One screw
(Washer head)
(+BVTAP 3 x 12)
3Two screws
(Washer head)
(+BVTAP 3 x 12)
!∞ Nut, locking
!¡ Holder, DGC(2)
Removal
q; Spring Tension(2)
Removal
8Loosen the Neck Assembly
fixing screw and removal
7VM1 Board Removal
9Chassis Assy Removal
5C6 Board Removal
6Loosen the Neck Assembly
fixing screw and removal
qs Degaussing Coil
!£ Band, DGC Removal
4Anode Cap Removal
qf Earth Coating Assy

–9 –
KV-AR25M81A
RM-952
• REMOVAL OF ANODE-CAP
Note:
•After removing the anode, short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT
shield or carbon paint on the CRT.
•REMOVING PROCEDURES
1Turn up one side of the rubber cap in the direction
indicated by the arrow a.
2Using a thumb pull up the rubber cap firmly in the direc-
tion indicated by the arrow b.
3When one side of the rubber cap is separated from the
anode button, the anode-cap can be removed by
turning up the rubber cap and pulling it up in the
direction of the arrow c.
•HOW TO HANDLE AN ANODE-CAP
1Do not damage the surface of anode-caps with
sharp shaped objects.
2Do not press the rubber too hard so as not to
damage the inside of anode-cap.
A metal fitting called the shatter-hook terminal is
built into the rubber.
3Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage
the rubber.
a
a
b
b
c
anode button