DOWNLOAD Sony KV-AW21M50 (serv.man3) Service Manual ↓ Size: 10.33 MB | Pages: 84 in PDF or view online for FREE

Model
KV-AW21M50 (serv.man3)
Pages
84
Size
10.33 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / SUPPLEMENT-1
File
kv-aw21m50-sm3.pdf
Date

Sony KV-AW21M50 (serv.man3) Service Manual ▷ View online

– 4 –
KV-AW21M50/M81/P50
RM-GA002
[+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.)
POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR
4. SELF DIAGNOSTIC SCREEN DISPLAY
5. HANDLING SELF DIAGNOSTIC SCREEN DISPLAY
6. SELF-DIAGNOSTIC CIRCUIT
5
8
No.
Description
Method
1.
Display self diagnostic screen
[Display] t [Channel    ] t [Volume    ] t [Power / TV]
Note: The above must be performed while TV is on standby mode.
2.
Stop standby flash
i) Turn off power switch on main.
ii) Unplug power cord from the outlet.
3.
Clear fault result
[Channel    ] t 
-
Note: Diagnostic results display on screen is not automatically cleared. Therefore,
clear result after completion of repair.
4.
Quit self diagnostic screen
Turn off power switch of remote commander or main unit.
2 OCP 
:  0
3 OVP 
:
N/A
4 VSTOP  :
1
5 AKB 
:
0
8 SUP 
:
0
101 WDT :  N/A
"0" means no fault has been detected.
"1" means a fault has been detected.
"2" means two faults have been detected.
"N/A" means not available for this models.
SELF DIAGNOSTIC
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
SDA0
V.GUARD
SDA
5
F.B-PLS
3
13
84
32
122
A BOARD
FROM
Q816
COLLECTOR
109
– 5 –
KV-AW21M50/M81/P50
RM-GA002
SECTION 1
DISASSEMBLY
1-2.
SPEAKER REMOVAL
1-1.
REAR COVER REMOVAL
1-4.
SERVICE POSITION
1-3.
CHASSIS ASSY REMOVAL
1-6.
H1 BOARD REMOVAL
1-5.
A BOARD REMOVAL
1 Nine screws
     (+BVTP 4 
× 16
      TYPE2 IT-3)
2 Rear cover
1 Two screws
 
(+BVTP 3 X 12
      TYPE2 IT-3)
A Board
2
2
2 H1 Board
  1 Three screws
       (+BVTP 3 x 12 TYPE2 IT-3)
– 6 –
KV-AW21M50/M81/P50
RM-GA002
1-7.
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
Chassis Assy.
3) Place the TV set with the CRT face down on a cushion (jig).
9 Degaussing Coil
0
 Spring Tension 
     Removal (x2)
8 Holder, DGC
     Removal (x2)
5 C Board Removal
6 Loosen the Neck Assembly
     fixing screw and remove
     Neck Assy & VM board
qa
 Earth Coating Assy
4 Anode Cap Removal
qs
 Nut, Special, CRT (x4)
7 Loosen the Deflection Yoke
     fixing screw and remove
• 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
Turn up one side of the rubber cap in the direction
indicated by the arrow A.
Using a thumb pull up the rubber cap firmly in the
direction indicated by the arrow B.
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
Do not damage the surface of anode-caps with
sharp shaped objects.
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.
Do 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
– 7 –
KV-AW21M50/M81/P50
RM-GA002
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
The controls and switch should be set as follows unless
otherwise noted:
Picture 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
Note: Test Equipment Required
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
SECTION 2
SET-UP ADJUSTMENTS
Preparation :
• 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
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
purity control so that green is in the center and blue and
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
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.
• Picture mode STANDARD.
• Receive dot/cross hatch pattern.
a) Vertical Static Convergence
a
b
b
c
c
d
d
a
Purity control
corrects this area.
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
4 pole magnet
RV705
H. STAT
RV1800
G2 (SCREEN) 
Center dot
R     G     B
G
R
B
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