Sony KV-SR252M89K Service Manual ▷ View online
– 4 –
KV-SR252M63K/M89K/N63K
RM-GA002
[+B overcurrent $OCP%]
Occurs when an overcurrent on the +B(135V) line is detected by pin 97 of IC001 (A board).
If the voltage of pin 97 of IC001 (A board) is more than 4V, the unit will automatically go to
standby.
If the voltage of pin 97 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 116 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.
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
116
45
97
7
A BOARD
FROM
Q816
COLLECTOR
30
POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR
for VIDEO PROCESSOR
4. SELF DIAGNOSTIC SCREEN DISPLAY
5. HANDLING SELF DIAGNOSTIC SCREEN DISPLAY
6. SELF-DIAGNOSTIC CIRCUIT
2 :
000
3 :
N/A
4 :
000
5 :
001
8 :
002
101 :
N/A
"0" means no fault has been detected.
"1" means a fault has been detected.
"2" means two faults has been detected.
"2" means two faults has been detected.
"N/A" means not available for this models.
SELF DIAGNOSTIC
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.
ii) Unplug power cord from the outlet.
3.
Clear fault result
In Self Diagnostic Screen, press,
[Channel ] t
-
Note: Diagnostic results display on screen is not automatically cleared. Therefore,
clear result after completion of repair.
clear result after completion of repair.
4.
Quit self diagnostic screen
Turn off power switch of remote commander or main unit.
– 5 –
KV-SR252M63K/M89K/N63K
RM-GA002
SECTION 1
DISASSEMBLY
1-3.
SPEAKER REMOVAL
1-4.
CHASSIS ASSY REMOVAL
1-5.
SERVICE POSITION
1-6.
TERMINAL BRACKET REMOVAL
1-1.
3D SPEAKER REMOVAL
1
Two screws
(+BVTP 4 × 16
Type2 IT-3)
Type2 IT-3)
2
Two screws
(Washer Head)
(+P4x16)
(+P4x16)
2
Four screws
(+BVTP 3 × 12
Type2 IT-3)
Type2 IT-3)
4
One screw
(+BVTP 3 × 12)
1
One screw
(+BVTP 4 × 16 Type2 IT-3)
5
One screw
(+BVTP 3 × 12)
3
Terminal bracket
1-2.
REAR COVER REMOVAL
2
Rear cover
1
Nine screws
(+BVTP 4 × 16)
1
3D Speaker box assy
– 6 –
KV-SR252M63K/M89K/N63K
RM-GA002
1-10. A AND B BOARDS REMOVAL
1-8.
F1 AND K2 BOARDS REMOVAL
1-9.
H4 AND H7 BOARDS REMOVAL
2
F1 Board
3
K2 Board
1
Two hooks
4
Two hooks
3
Four hooks
1
Five hooks
2
H7 Board
4
H4 Board
5
Four screws
(3 × 12)(+) BVTAP
4
Two hooks
3
Four hooks
1
B Board
2
A Board
1-7.
F2 AND J3 BOARDS REMOVAL
3
F2 Board (except KV-SR252M63K)
1
J3 Board
2
Four screws
(+BVTP 3 × 12 Type2 IT-3)
– 7 –
KV-SR252M63K/M89K/N63K
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 direc-
tion 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.
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.
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 rubber.
1-11. 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.
right and left.
1) Remove the rear cover.
2) Unplug all interconnecting leads from the Deflection yoke, Neck assy, Degaussing Coil and CRT grounding strap.
2) Unplug all interconnecting leads from the Deflection yoke, Neck assy, Degaussing Coil and CRT grounding strap.
Remove Chassis Assy.
3) Place the TV set with the CRT face down on a cushion jig.
a
a
c
Anode Button
b
b
4
Anode Cap Removal
q;
Degaussing Coil
6
Loosen the Neck Assembly
fixing screw and remove
Neck Assy & VM board
Neck Assy & VM board
7
Loosen the Deflection Yoke
fixing screw and remove
5
C Board Removal
qs
Spring Tension (x2)
Removal
9
Holder, DGC
Removal (x2)
qa
Earth Coating Assy
qd
Screw Tapping 7+ Crown Washer (4x)