Sony KV-XR25M31 Service Manual ▷ View online
– 5 –
KV-XR25M31
RM-W103
5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
Since the diagnosis 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".
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 sequentially when the self-diagnostic screen is
displayed, as shown below:
To clear the result display to "0", press buttons on the remote commander sequentially when the self-diagnostic screen is
displayed, as shown below:
Channel [8]
/ "0"
[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-DIAGNOSIS CIRCUIT
[+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 less than 1V when V.SYNC is
more than HV, the unit will automatically go to standby.
(A Board). If the voltage of pin 97 of IC001 (A Board) is less than 1V when V.SYNC is
more than HV, the unit will automatically go to standby.
[I-Port]
Occurs when an absence of the vertical deflection pulse is detected by pin 116 of
IC001 (A Board).
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, and indicalor will start to Blink 5
times.
will be detected by IC001 (A Board). TV will stay on, and indicalor will start to Blink 5
times.
[HV Protect]
Occurs when IC001 internal HV protect detects an abnormal. H-Pulse (frequency) due
to unproper power supply to IC001. TV cuts off high voltage power of anode CRT. No
picture will be detected eg IC607, IC604 go faulty.
to unproper power supply to IC001. TV cuts off high voltage power of anode CRT. No
picture will be detected eg IC607, IC604 go faulty.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects 1K)
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC503
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
Q511
COLLECTOR
20
– 6 –
KV-XR25M31
RM-W103
1 One screws
(+BVTP 3
(+BVTP 3
× 12)
Type 2 IT-3
6 Two hooks
2 One screws
(+BVTP 3
(+BVTP 3
× 12)
Type 2 IT-3
7 J1 Board
4 Two screws
(+BVTP 3
(+BVTP 3
× 12)
Type 2 IT-3
3 One screws
(+BVTP 4
(+BVTP 4
× 16)
Type 2 IT-3
5 Terminal bracket
1 Eleven screws
(+BVTP 4
(+BVTP 4
× 16)
Type 2 IT-3
2 Rear cover
1 Two hooks
2 F Board
SECTION 1
DISASSEMBLY
1-1.
REAR COVER REMOVAL
1-2.
SPEAKER BLOCK ASSY REMOVAL
1-5.
F BOARD REMOVAL
1-6.
TERMINAL BRACKET AND J1 BOARD REMOVAL
1-3.
CHASSIS ASSY REMOVAL
1-4.
SERVICE POSITION
1 Two screws
(Washer Head)
(+P4
(Washer Head)
(+P4
× 16)
– 7 –
KV-XR25M31
RM-W103
1-7.
H3 BOARD REMOVAL
1-8.
A BOARD REMOVAL
1 Six Hooks
2
H3 Board
1 Four screws
(3
(3
× 12)(+BVTAP)
3 Four Hooks
4 A Board
2 Two screws
washer head
(+P 3
washer head
(+P 3
× 12)
– 8 –
KV-XR25M31
RM-W103
• 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.
a
a
b
b
c
anode button
1-9.
PICTURE TUBE REMOVAL
Note:
• The picture tube is upside-down 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
• 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) Remove the Speaker Block Assy.
2) Remove the rear cover.
3) Remove the Speaker Block Assy.
qa
Earth Coating Assy
4
Anode Cap Removal
qs
Band, DGC Removal
5 C Board Removal
9 Chassis Assy Removal
7 VM Board Removal
qd
Holder, DGC(2) Removal
0
Spring Tension(2) Removal
qg
Screw Tapping 7+
Crown washer
qf
Degaussing Coil
6 Loosen the Neck Assembly
fixing screw and removal
fixing screw and removal
8
Loosen the Deflection Yoke
fixing screw and remove
Click on the first or last page to see other KV-XR25M31 service manuals if exist.