KV-BM21M10 - Sony TV Service Manual (repair manual)

Model
KV-BM21M10
Pages
127
Size
9.43 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-bm21m10.pdf
Date

View Sony KV-BM21M10 Service Manual online

MODEL
COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON 
®
 
COLOR TV
SERVICE MANUAL
BX1S
MODEL
COMMANDER   DEST.
CHASSIS NO.
KV-BM21M10
RM-W101 Oceania
SCC-V03B-A
KV-BM21M40
RM-W101 Malaysia
SCC-U96C-A
KV-BM21N70
RM-W151 Taiwan
SCC-V05A-A
KV-BM21P42
RM-W101 Thailand
SCC-U94E-A
RM-W101
RM-W151
TV
1
2
3
4
6
7
8
9
0
5
MENU
MUTING
DISPLAY POWER
TV/VIDEO
PICTURE
  MODE
SOUND
 MODE
SLEEP
RESET
CH
VOL
JUMP
ENT
MTS/SAP
– 5 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
TABLE OF CONTENTS
SELF DIAGNOSTIC FUNCTION .............................. 6
1. DISASSEMBLY
1-1. Rear Cover Removal ................................................. 9
1-2. Speaker Removal ...................................................... 9
1-3. Chassis Assy Removal .............................................. 9
1-4. Service Position ........................................................ 9
1-5. Terminal Bracket Removal ....................................... 9
1-6. A Board Removal ...................................................... 9
1-7. Picture Tube Removal ............................................. 10
2. SET-UP ADJUSTMENTS
2-1. Beam Landing ......................................................... 11
2-2. Convergence ............................................................ 12
2-3. Focus Adjustment .................................................... 14
2-4. G2 (SCREEN) Adjustments ................................... 14
2-5 White Balance Adjustment ..................................... 14
2-6 Sub Bright Adjustment ........................................... 14
3. CIRCUIT ADJUSTMENTS
3-1. Adjustment With Commander ................................ 15
3-2. Adjustment Method ................................................ 16
3-3. Picture Quality Adjustment .................................... 30
3-4. Deflection Adjustment ............................................ 30
3-5. Drive Adjustment .................................................... 31
3-6. Picture Distortion Adjustment ................................ 32
Section
Title
Page
Section
Title
Page
4. DIAGRAMS
4-1. Block Diagram ........................................................ 33
4-2. Circuit Boards Location .......................................... 34
4-3. Schematic Diagram Information ............................ 34
4-3-1. C  Board Schematic Diagram ...................... 35
4-3-2. A Board — Processor (Block A) ................. 36
4-3-3. A Board — Audio (Block B) ....................... 38
4-3-4. A Board — Power Supply (Block C) .......... 40
4-3-5. A Board — Deflection (Block D) ................ 42
4-3-6. A Board — Tuner (Block E) ........................ 44
4-3-7. A Board — Jack (Block F) .......................... 46
4-4. Voltage Measurement and Waveforms ................... 51
4-5. Printed Wiring Boards and Parts Location ............. 54
4-6. Semiconductors ....................................................... 57
5. EXPLODED VIEWS
5-1. Chassis ..................................................................... 60
6. ELECTRICAL PARTS LIST .................................... 61
OPERATING INSTRUCTIONS
– 6 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
The units in this manual contain a self diagnostic function. If an error occurs, the STANDBY (1) indicator will
automatically begin to flash. A description of the self-diagnosis function is explained in the instruction manual. The
number of times the STANDBY (1) indicator flashes translates to a probable source of the problem. 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 (1) indicator will flash a set number of times to indicate the possible cause of
the problem. If there is more than one error, the indicator will identify the first of the problem areas.
Result for all of the following diagnosis items are displayed on screen. No error has occured if the screen displays a
"0".
*
If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is
diagnosed first by the mirco controller is displayed on the screen.
** Refer to Screen (G2) Adjustment in this manual.
SELF DIAGNOSTIC FUNCTION
Diagnosis
Item
Description
Power does
not turn on
+B overcurrent
(OCP)*
V-Protect
IK (AKB)
Power supply
NG (+5V) for
Video Processor
No. of timer
STANDBY (1)
indicator flashes
Does not light
2 times
4 times
5 times
8 times
Self-Diagnostic
display/
Diagnosis result
2:0
or
2:1 ~ 255
4:0
or
4:1 ~ 255
5:0
or
5:1 ~ 255
8:0
or
8:1 ~ 255
Probable Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out (F600)
A board.
• H OUT (Q805) is shorted.
(A board)
• IC751 is shorted. (C board)
• +13V is not supplied.
(A board)
• IC804 is faulty. (A board)
• Video OUT (IC1545) is
faulty. (A board)
• IC001 is faulty. (A board)
• Screen (G2) is improperly
adjusted.**
• IC604 faulty.
• IC602 faulty.
Detected
Symptoms
• Power does not turn on.
• No power is supplied on
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 shorted.
• No raster is generated.
• CRT Cathode current
detection reference pulse
output is small.
• No power supply to CRT
ANODE.
• No RASTER is generated.
– 7 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
2. DISPLAY OF 
STANDBY (1)
 INDICATOR
FLASH COUNT
3. STOPPING THE 
STANDBY (1)
 INDICATOR FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY (1)
indicator from flashing.
4. SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as "power sometimes shuts off" or "screen sometimes goes off" 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 5 / Volume 
/ Power 
 / TV 
˘
Note that this differs from entering the service mode (volume [+]).
The following screen will be displayed indicating the error count.
Diagnostic Item
Flash Count*
+B overcurrent
2 times
V-Protect
4 times
IK (AKB)
5 times
Power Supply NG (+5V)
8 times
for Video processor
* One flash count is not used for self-diagnosis.
Lamp OFF 3 sec 
Lamp ON 300ms
Lamp OFF 300ms
2 : 
0
3 :
N/A
4 :
0
5 :
1
8 :
0
101 :
N/A
SELF DIAGNOSTIC
Numeral "0" means that no fault was detected.
Numeral "1" means the number of a fault occurrence (1 ~ 255).
 STANDBY u indicator
– 8 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
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-diagnosis 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 subsequent as shown below when the
self-diagnostic screen is being displayed.
, -
[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 $OCP%]
Occurs when an overcurrent on the +B(135V) line is detected by pin 32 of IC001 (A board).
If the voltage of pin 32 of IC001 (A board) is more than 4V, the unit will automatically go
to standby.
[V-PROTECT]
Occurs when an absence of the vertical deflection pulse is detected by pin 13 of IC001
(A board).
[IK $AKB%]
If the RGB levels* do not balance within 15 sec after the power is turned on, this error will
be detected by IC001 (A board). TV will stay on, but there will be 5 times LED blinking.
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to
improper power supply to IC001. TV cuts off high voltage power of anode CRT. No picture
will be detected. eg: IC602, IC604 go faulty.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V.OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
FROM
C BOARD
IC751 PIN 5
IK
EHTO
RED LED
DISPLAY
SDA1
V.GUARD
SDA
5
F.B-PLS
3
13
84
32
122
A BOARD
FROM
Q804
COLLECTOR
99
POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR
– 9 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
SECTION 1
DISASSEMBLY
1-1.
REAR COVER REMOVAL
1-2.
SPEAKER REMOVAL
1-3.
CHASSIS ASSY REMOVAL
1-4.
SERVICE POSITION
1-5.
TERMINAL BRACKET REMOVAL
1-6.
A BOARD REMOVAL
2 Eight screws
     (+BVTP 4 
× 16)
1 Rear cover
Two screw
(+BVTP 3 x 12)
4 Terminal
     bracket
1 One screw
     (+BVTP 4 
× 16)
2 FBT Bracket
3 Two screws
     (+BVTP 4 
× 16)
A Board
– 10 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
• 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
1
Turn up one side of the rubber cap in the direction
indicated by the arrow 
A.
2
Using a thumb pull up the rubber cap firmly in the di-
rection indicated by the arrow 
B.
3
When 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
1
Do not damage the surface of anode-caps with
sharp shaped objects.
2
Do 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.
3
Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage
the rubber.
anode button
a
a
b
b
c
1-7.
PICTURE TUBE  REMOVAL
Note:
• The picture tube is upside-down for KV-BM21M10 (OCE) only and the position for the anode cap and tension
springs are changed accordingly.
• 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) Remove the rear cover.
3) Unplug all under connecting leads from the Deflection Yoke, Degaussing Coil and CRT grounding strap.
qs
 Earth Coating Assy
qf
 Top Switch Block
0 Degaussing Coil
5 C Board Removal
7 Chassis Assy Removal
8
 Support, CRT Removal (x2)
qa
 Spring Tension Removal
!£ Nut, Special, CRT (x4)
6
 Loosen the Deflection Yoke
fixing screw and remove
4 Anode Cap Removal
– 11 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
• The following adjustments should be made when a
complete realignment is required or a new picture
tube is installed.
Set the controls as follows unless otherwise noted:
VIDEO model .....................................................  Standard
PICTURE control ..................................................  normal
BRIGHTNESS control ..........................................  normal
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. Screen(G2)
5. White Balance
Note : Test Equipment Required.
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
5. Oscilloscope
SECTION 2
SET-UP ADJUSTMENTS
Fig. 2-1
Fig. 2-4
Fig. 2-3
Fig. 2-2
Purity control
Red
Blue
Green
Purity control
corrects this area.
Disk magnets or rotatable
disk magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
a
b
b
c
c
d
d
a
Preparation :
• In order to reduce the influence of geomagnetism on
the set's picture tube, face it east or west.
• Switch on the set's power and degauss with the
degausser.
2-1. BEAM LANDING
Picture Mode: DYNAMIC
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Set the pattern generator raster signal to a green
raster.
3. Move the deflection yoke to the rear and adjust with
purity control so that the green is at the center and
the blue and the red take up equally sized areas on
each side. (See Figures 2-1 through 2-4.)
4. Move the deflection yoke forward and adjust so that
the entire screen is green. (See Figure 2-1.)
5. Switch the raster signal to blue then to red and verify
the condition.
6. When the position of the deflection yoke has been
decided fasten the deflection yoke with the screws
and DY spacers.
7. If the beam does not land correctly in all the corners,
use a magnet to adjust it. (See Figure 2-4.)
}
......................................................................................................................................................................................................................
normal
– 12 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
2-2. CONVERGENCE
• Before starting this adjustment, adjust the focus,
horizontal size and vertical size.
• Receive dot/hatch signal.
• Pic mode: Soft.
(1) Horizontal and Vertical Static Convergence
1. (Moving vertically), adjust the V.STAT magnet so that
the red, green and blue dots are on top of each other
at the center of the screen.
2. (Moving horizontally), adjust the H.STAT control so
that the red, green and blue dots are on top of each
other at the center of the screen.
3. If the H.STAT variable resistor cannot bring the red,
green and blue dots together at the center of the
screen, adjust the horizontal convergence with the
H.STAT variable resistor and the V.STAT magnet in
the manner given below.
(In this case, the H.STAT variable resistor and the
V.STAT magnet influence each other, so be sure to
perform adjustments while tracking.)
Center dot
R    G    B
R
G
B
H. STAT VR
V. STAT
Magnet
RV750
H. STAT
C Board
BMC (Hexapole)
V.STAT
DY pocket
Purity
V.STAT
BMC
Purity
Operation of V.STAT magnet
If the V.Stat magnet is moved in the “A” and “B” arrows,
the red, green and blue dots moves as shown below.
Moved RV750 H.STAT.
the red, green and blue dots move as shown below.
4. BMC (Hexapole) Magnet.
If the red, green and blue dots are not balanced or
aligned, then use the BMC magnet to adjust in the
manner described below.
R
R
G
G
B
B
A
B
B
A
R
R
G
G
B
B
A
B
– 13 –
KV-BM21M10/BM21M40/BM21P42
RM-W101
KV-BM21N70
RM-W151
(2) Convergence Rough Adjustment
Preparation:
• Before starting this adjustment, adjust the horizontal
static convergence and the vertical static
convergence
TLV
R B
YCH
R
B
XCV
B
R
TLH
B
R
Piece A (90), conv. correct
a
b
c
d
TLH
Insert
TLH
Correction Plate to DY Pocket
(Left or Right)
YCH
Insert
YCH
VOL on DY
TLV
Rotate TLV
VOL on DY
XCV
Rotate XCV
Adj core on DY
(3) Screen corner Convergence
1. Affix a Piece A (90), conv. correct corresponding to
the misconverged areas.
b
a
c
d
a-d : screen-corner
        misconvergence
ON DY:
TLV
TLV
XCV
YCH
DY pocket
DY pocket
TLH Plate
XCV

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