Sony KV-AR25M80A Service Manual ▷ View online
MODEL
COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON
®
COLOR TV
SERVICE MANUAL
BG3R
MODEL
COMMANDER DEST.
CHASSIS NO.
KV-AR25M80A
RM-952 Pakistan
– 2 –
KV-AR25M80A
RM-952
TABLE OF CONTENTS
SELF DIAGNOSTIC FUNCTION ........................................ 3
1. DISASSEMBLY
1-1.
Rear Cover Removal ................................................... 6
1-2.
Speaker Block Assy Removal ..................................... 6
1-3.
Chassis Assy Removal ................................................ 6
1-4.
Service Position .......................................................... 6
1-5.
Terminal Bracket and J Board Removal .................... 6
1-6.
V1 Board Removal ..................................................... 6
1-7.
H1 and H2 Boards Removal ....................................... 7
1-8.
A and B9 Boards Removal ......................................... 7
1-9.
Picture Tube Removal ................................................. 7
2. SET-UP ADJUSTMENTS
2-1.
Beam Landing ............................................................. 9
2-2.
Convergence .............................................................. 10
2-3.
Focus Adjustment ..................................................... 12
2-4.
G2 (SCREEN) and White Balance Adjustment ....... 13
3. CIRCUIT ADJUSTMENTS
3-1.
Adjustment With Commander .................................. 14
3-2.
Adjustment Method .................................................. 14
3-3.
Picture Quality Adjustments ..................................... 20
3-4.
Deflection Adjustments ............................................ 20
3-5.
H-Trapezoid Adjustment .......................................... 21
3-6.
A Board Adjustment After IC003 (MEMORY)
Replacement .............................................................. 21
Replacement .............................................................. 21
3-7.
Picture Distortion Adjustment .................................. 22
Section
Title
Page
Section
Title
Page
4. DIAGRAMS
4-1.
Block Diagram .......................................................... 23
4-2.
Circuit Board Location ............................................. 25
4-3.
Schematic Diagram Information .............................. 26
(1) A Board Schematic Diagram .............................. 27
(2) B9 Board Schematic Diagram ............................ 31
(3) C6 Board Schematic Diagram ............................ 33
(4) H1 Board Schematic Diagram ............................ 35
(5) H2 Board Schematic Diagram ............................ 37
(6) J Board Schematic Diagram ............................... 38
(7) VM1 Board Schematic Diagram ........................ 39
(1) A Board Schematic Diagram .............................. 27
(2) B9 Board Schematic Diagram ............................ 31
(3) C6 Board Schematic Diagram ............................ 33
(4) H1 Board Schematic Diagram ............................ 35
(5) H2 Board Schematic Diagram ............................ 37
(6) J Board Schematic Diagram ............................... 38
(7) VM1 Board Schematic Diagram ........................ 39
4-4.
Voltage List and Waveforms ..................................... 40
4-5.
Printed Wiring Boards and Parts Location ............... 44
4-6.
Semiconductors ......................................................... 49
5. EXPLODED VIEWS
5-1.
Speaker Block ........................................................... 51
5-2.
Chassis ...................................................................... 52
5-3.
Picture Tube .............................................................. 53
6. ELECTRICAL PARTS LIST ......................................... 54
INSTRUCTION MANUAL
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.
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.
THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
– 3 –
KV-AR25M80A
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.
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.
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)
overvoltage
(OVP)
• Vertical deflection
stopped
• Horizontal
deflection
overdrive
overdrive
• White balance
failure (no
PICTURE)
PICTURE)
• Micro reset
Detected
Symptoms
• Power does not come on.
• No power is supplied to the
• No power is supplied to the
TV.
• AC power supply is faulty.
• Power does not come on.
• Load on power line is
• 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
• CRT cathode current
detection reference pulse
output is small.
output is small.
• Power is shut down shortly,
after this return back to
normal.
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
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
• R(Q703), G(Q702) or
B(Q701) out is faulty
(C6 board)
(C6 board)
• IC301 is faulty. (A board)
• No connection A board to
• No connection A board to
C6 board.
• Discharge CRT (C6 Board)
• Static discharge
• External noise
• Static discharge
• External noise
– 4 –
KV-AR25M80A
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.
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:
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:
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
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