Sony KV-SW21M53 Service Manual ▷ View online
– 5 –
KV-SW21M53/SW21M81/SW21N50
RM-GA002
SECTION 1
DISASSEMBLY
1.2
REAR COVER REMOVAL
1-4.
CHASSIS ASSY REMOVAL
1-3.
SPEAKER REMOVAL
1-6.
TERMINAL BRACKET AND
J BOARD REMOVAL
1-5.
SERVICE POSITION
1.1
3D BOX REMOVAL (KV-SW21M53)
1
3D Speaker box assy
2
Rear cover
1
Eight screws
(+BVTP 4
× 16)
2
Rear cover
1
Two screws
(Washer Head)
(+P4 x16)
(+P4 x16)
3
Terminal bracket
1
One screw
(+
BVTP
3
×
12
)
2
One screw
(
+BVTP
4
×
16
)
4
Two screws
(
+BVTP
3
×
12
)
5
J Board
(
KV-SW21M53
)
– 6 –
KV-SW21M53/SW21M81/SW21N50
RM-GA002
1.7
A BOARD REMOVAL
1-8
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) Remove the Rear Cover.
2) Unplug all interconnecting leads from the Deflection Yoke, Neck Assy, Degaussing Coils and CRT grounding strap. Remove
2) Unplug all interconnecting leads from the Deflection Yoke, Neck Assy, Degaussing Coils and CRT grounding strap. Remove
Chassis Assy.
3) Place the TV set with the CRT face down on a cushion (jig).
A Board
qd
Screw, Tapping 5 + Crown Washer (x4)
4
Anode Cap Removal
7
Degaussing Coil
6
Loosen the Neck Assembly
fixing screw and remove
Neck Assy & VM board
Neck Assy & VM board
qa
Loosen the Deflection Yoke
fixing screw and remove
fixing screw and remove
5
C Board Removal
9
Spring Tension
Removal (x2)
8
Holder, DGC
Removal (x2)
0
Earth Coating Assy
qs
Supports, CRT
Removal (x2)
– 7 –
KV-SW21M53/SW21M81/SW21N50
RM-GA002
• 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 direction
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.
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.
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.
rubber.
A
A
B
B
C
Anode Button
– 8 –
KV-SW21M53/SW21M81/SW21N50
RM-GA002
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
realignment is required or a new picture tube is installed.
The controls and switch should be set as follows unless
otherwise noted:
otherwise noted:
Picture control ......................................................... NORMAL
Brightness control ................................................... NORMAL
Brightness control ................................................... NORMAL
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. G2 (SCREEN)
5. White Balance
1. Beam Landing
2. Convergence
3. Focus
4. G2 (SCREEN)
5. White Balance
Note: Test Equipment Required
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
SECTION 2
SET-UP ADJUSTMENTS
Preparation :
• Feed in the white pattern signal.
• Feed in the white pattern signal.
• Before starting, degauss the entire screen with the
degausser.
• In order to reduce the geomagnetism on the set's
picture tube, face it east or west.
2-1. BEAM LANDING ADJUSTMENT
1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw, and set the
2. Loosen the deflection yoke mounting screw, and set the
purity control to the center as shown below.
3. Set the raster signal of the pattern generator to green.
4. Move the deflection yoke (DY) backward and adjust the
4. Move the deflection yoke (DY) backward and adjust the
purity control so that green is in the center and blue and
red are at the sides evenly.
red are at the sides evenly.
5. Then move the DY forward and adjust so that the entire
screen becomes green.
6. Now switch over raster signal to red then blue and
confirm the condition.
...................................................................................................................................................................................................................... ...........
5. Oscilloscope
6. Landing Checker
7. XCV Adjuster
6. Landing Checker
7. XCV Adjuster
Purity control
Red
Blue
Green
7. When the position of the DY is determined, tighten it
with the DY mounting screw.
8. If the beam does not land correctly in all corners of the
screen, use magnet disc to correct it.
2-2. CONVERGENCE ADJUSTMENT
Preparation :
• Before starting, perform FOCUS adjustment.
• Before starting, perform FOCUS adjustment.
• Picture mode STANDARD.
• Receive dot/cross hatch pattern.
a) Vertical Static Convergence
Purity control
corrects this area.
corrects this area.
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
disc magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
corrects these areas.
a
b
b
c
c
d
d
a
Center dot
R G B
R
G
B
4 pole magnet
RV750
H. STAT
H. STAT
C/CV Board
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