Sony KV-HW212M20 Service Manual ▷ View online
– 5 –
KV-HW212M20
RM-W101
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".
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.
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.
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.
8
, -
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
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.
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).
(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.
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.
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
Q816
COLLECTOR
99
POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR
for VIDEO PROCESSOR
– 6 –
KV-HW212M20
RM-W101
2 Rear cover
1 3D Speaker box assy
SECTION 1
DISASSEMBLY
1-2.
REAR COVER REMOVAL
1-6.
TERMINAL BRACKET REMOVAL
2
Terminal
bracket
3
One screw
(+BVTP 4
× 16)
1
One screw
(+BVTP 3
× 12)
1-1.
3D SPEAKER REMOVAL
(not used for this model)
1-4.
CHASSIS ASSY REMOVAL
1-3.
SPEAKER REMOVAL
1
Two screws
(WH DIA.16)
(+P4
(WH DIA.16)
(+P4
× 16)
1-5.
SERVICE POSITION
2
Rear cover
1
Eight screws
(+BVTP 4
(+BVTP 4
× 16)
– 7 –
KV-HW212M20
RM-W101
A Board
1-8.
A BOARD REMOVAL
1
J Board
Two screws (+BVTP 3
Two screws (+BVTP 3
× 12)
1-7.
J BOARD REMOVAL
(not used for this model)
1-9.
PICTURE TUBE REMOVAL
Note:
• The picture tube for South Africa model is upside down and 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) Remove the rear cover.
2) Unplug all under connecting leads from the Deflection Yoke, Degaussing Coil and CRT grounding strap. Remove
2) Unplug all under connecting leads from the Deflection Yoke, Degaussing Coil and CRT grounding strap. Remove
Chassis Assy.
3) Place the TV set with the CRT face down on a cushion jig.
4
Degaussing Coil
8
C Board Removal
qa
Support, CRT(2) Removal
9
Loosen the Neck Assembly
fixing screw and removal
5
Holder, DGC(2)
Removal
6
DGC(2) Removal
7
Spring Tension (2)
Removal
qs
Screw, Tapping 5
+ Crown washer (4)
q;
Loosen the Deflection Yoke
fixing screw and remove
– 8 –
KV-HW212M20
RM-W101
• 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.
indicated by the arrow A.
2
Using a thumb pull up the rubber cap firmly in the di-
rection indicated by the arrow B.
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
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.
direction of the arrow C.
• HOW TO HANDLE AN ANODE-CAP
1
Do not damage the surface of anode-caps with
sharp shaped objects.
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.
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.
The shatter-hook terminal will stick out or damage
the rubber.
anode button
a
a
b
b
c
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