KV-AR25M81A — Sony TV Service Manual (repair manual)

Model
KV-AR25M81A
Pages
89
Size
5.04 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-ar25m81a.pdf
Date

View Sony KV-AR25M81A Service Manual online

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
I
UHF: 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
M
VHF: 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
C
B
: 0.7 Vp-p, 75 ohms
C
R
: 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 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.
Note
– 3 –
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
– 4 –
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
Page of 89
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Here you can view online or download Sony KV-AR25M81A Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony KV-AR25M81A TV. Information contained in Sony KV-AR25M81A service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).