Sony KV-DA28M36 Service Manual ▷ View online
– 5 –
KV-DA28M36/M64
RM-W105
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-diagnostic 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 as shown below when the
diagnostic screen is being displayed.
To clear the result display to "0", press buttons on the remote commander sequentially as shown below when the
diagnostic screen is being displayed.
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-DIAGNOSTIC CIRCUIT
[High voltage protector of Horizontal Deflection]
Occurs when an overcurrent on the +B(135) line is detected by Q6804.
If Q6804 go to ON, the voltage to the pin57 of IC4301 go to "HIGH".
The unit will automatically turn off.
If Q6804 go to ON, the voltage to the pin57 of IC4301 go to "HIGH".
The unit will automatically turn off.
[+B overcurrent OCP ]
Occurs when an overvoltage of horizontal pulse is detected by D6809.
If the voltage of anode D6809, Q6814 and D6808 goes to High, the
voltage to pin57 of IC4301 go to "HIGH".
The unit will automatically turn off.
If the voltage of anode D6809, Q6814 and D6808 goes to High, the
voltage to pin57 of IC4301 go to "HIGH".
The unit will automatically turn off.
[+B overvoltage OVP ]
Occurs when an overvoltage on the +B(135) line is detected by D6635
and Q6611. If Q6611 go to ON, the voltage to pin6 of IC001 go to
"HIGH". The unit will automatically turn off.
and Q6611. If Q6611 go to ON, the voltage to pin6 of IC001 go to
"HIGH". The unit will automatically turn off.
[Vertical deflection failure]
Occurs when an absence of the vertical deflection pulse is detected by
Q6808 and R6910. Shut down the power supply.
Q6808 and R6910. Shut down the power supply.
[White balance failure]
If the RGB levels do not balance or become low level within 5 seconds.
This error will be detected by IC4301.
TV will stay on, but there will be no picture.
This error will be detected by IC4301.
TV will stay on, but there will be no picture.
[5V/9V failure]
Occurs when 5V/9V is not supplied to Mcon (IC001).
No raster will be detected or no picture.
No raster will be detected or no picture.
IC4301
RGB JUNGLE
CXA2170AQ
OVP
FROM
CRT (IK)
[V] Q6808, R6910
IC001
SYSTEM
SDA
SDA
9V
5V
IC004
MEMORY
IK_IN
H PROT
RED LED
5
24
57
7
6
V PROT
56
[OCP] Q6804, D6821
[H] D6808, D6809
84
14,47,
82
– 6 –
KV-DA28M36/M64
RM-W105
SECTION 1
DISASSEMBLY
1-1.
REAR COVER REMOVAL
1-2.
SPEAKER REMOVAL
1-3.
CHASSIS ASSY REMOVAL
1-4.
SERVICE POSITION
1-5.
TERMINAL BRACKET REMOVAL
1-6.
J BOARD REMOVAL
1
Twelve screws
(+BVTP 4
× 16 Type2 IT-3)
2
Rear cover
1
Two screws
(+BVTP 4
× 16
Type2 IT-3)
2
Two screws
(Washer Head)
(+P4x16)
(+P4x16)
3
Two screws
(+BVTP 4
× 16
Type2 IT-3)
2
Five screws
(+BVTP 3
× 12
Type2 IT-3)
3
One screw
(+BVTP 3
× 12
Type2 IT-3)
3
One screw
(+BVTP 3
× 12)
1
One screw
(+BVTP 4
× 16
Type2 IT-3)
4
Two Hooks
5
Terminal bracket
2
Five screws
(+BVTP 3
× 12
Type2 IT-3)
1
J board
– 7 –
KV-DA28M36/M64
RM-W105
1-7.
BC BOARD REMOVAL
1-8.
BH1 AND BP BOARD REMOVAL
1-9.
WL BOARD REMOVAL
1-10. DL BOARD REMOVAL
1-11. F1 BOARD REMOVAL
1-12. H1 AND H2 REMOVAL
4
BC Board
3
Two Hooks
3
Two Hooks
1
BP Board
4
BH1 Board
2
Two Hooks
2
WL Board
1
Three Hooks
3
Three screws
(+BVTP 3
× 12 Type2 IT-3)
2
DL Board
1
Three Hooks
2
F1 Board
1
Four Hooks
3
Four Hooks
1
Five Hooks
2
H1 Board
4
H2 Board
– 8 –
KV-DA28M36/M64
RM-W105
1-14. PICTURE TUBE REMOVAL
Note:
•
The picture tube is upside-down for KV-DA28M36 (Oceania) model and the position for the anode cap and tension
spring are changed accordingly.
spring 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.
right and left.
•
When removing the Nut Locking: first make sure to hold the Nut special CRT with a spanner while opening the Nut
Locking using a torque driver. Then proceed to remove the Nut special CRT using a torque driver.
Locking using a torque driver. Then proceed to remove the Nut special CRT using a torque driver.
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
1-13. A AND D BOARDS REMOVAL
5
Two screws
(Washer Head)(+P3
× 12)
2
Five screws
(3
× 12)(+) BVTAP
3
Two Hooks
1
Five connectors
6
Five Hooks
4
D Board
7
A Board
4
Anode Cap Removal
8
Earth Coating Assy(2) Removal
q;
Loosen the Neck Assembly
fixing screw and remove Neck
Assy and VM board
fixing screw and remove Neck
Assy and VM board
qa
Loosen the Deflection Yoke
fixing screw and remove
fixing screw and remove
9
C Board Removal
7
Spring Tension
Removal (x2)
Removal (x2)
5
Holder, DGC
Removal (x2)
Removal (x2)
qs
Supports, CRT
Removal (x2)
Removal (x2)
6
Degaussing Coil
qd
Screw (5) Tapping
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