Sony KD-30XS955 (serv.man2) Service Manual ▷ View online
10
KD-30XS955/34XS955
KD-30XS955/34XS955
+B overcurrent (OCP)
Occurs when excessive current fl ows through R5013. The increase in voltage across R5013 causes the output of Q5004 to go high, and this high
signal goes to the micro.
Occurs when excessive current fl ows through R5013. The increase in voltage across R5013 causes the output of Q5004 to go high, and this high
signal goes to the micro.
+B overvoltage (OVP)
IC6505 detects +B OVP condition and turns on Q6522. This sends a high signal to the micro and also shuts down the AC relay.
IC6505 detects +B OVP condition and turns on Q6522. This sends a high signal to the micro and also shuts down the AC relay.
V-STOP
Occurs when an absence of the vertical defl ection pulse is detected by pin 24 of IC2801 (B Board). Power supply will shut down when waveform
interval exceeds 2 seconds.
Occurs when an absence of the vertical defl ection pulse is detected by pin 24 of IC2801 (B Board). Power supply will shut down when waveform
interval exceeds 2 seconds.
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC2801. TV will stay on, but there will be
no picture.
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC2801. TV will stay on, but there will be
no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Low B OCP/OVP
Occurs when set 5V is out.
Occurs when set 5V is out.
Horizontal Defl ection Stopped
Occurs when either:
Occurs when either:
1) a +B overcurrent is detected (IC5007), or
2) overheating is detected (Thermistor TH5002).
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KD-30XS955/34XS955
KD-30XS955/34XS955
1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
1-2. CHASSIS ASSEMBLY REMOVAL
1-3. SERVICE POSITION
Rear Cover
5 Screws
+BVTP 4 x 16
TYPE2 TT (B)
+BVTP 4 x 16
TYPE2 TT (B)
5 Screws
+BVTP 4 x 16
TYPE2 TT (B)
+BVTP 4 x 16
TYPE2 TT (B)
4 Screws
+BVTP 4 x 16
TYPE2 TT (B)
+BVTP 4 x 16
TYPE2 TT (B)
1
Lift lever up on the right and left sides of the chassis
bracket and gently pull the chassis assembly away from
the bezel.
the bezel.
CAUTION! - Heat sink on IC5004 is -15V. Do not to allow
heat sink to touch GND or any other components.
heat sink to touch GND or any other components.
Heat sink on Q8018 VpK=250V. Do not touch or short to
GND or other components.
GND or other components.
CAUTION! - Pay attention to Neck Assembly WY Board wire
harness to B Board. The WY Board can easily break if there
is sudden or excessive tension on the harness.
harness to B Board. The WY Board can easily break if there
is sudden or excessive tension on the harness.
1
Lift lever up on the right and left sides of the chassis bracket
and gently pull the chassis assembly away from the bezel.
2
Pull up and rotate both the A and D Boards in order to
service the unit.
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KD-30XS955/34XS955
KD-30XS955/34XS955
1. Discharge the anode of the CRT and remove the
anode
anode
cap.
2. Unplug all interconnecting leads from the defl ection
yoke, neck assembly, degaussing coils and CRT
grounding
yoke, neck assembly, degaussing coils and CRT
grounding
strap.
3. Remove the CX Board from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fi xing screw and remove.
6. Loosen the defl ection yoke fi xing screw and remove.
7. Place the set with the CRT face down on a cushion
and remove the degaussing coil holders.
8. Remove the degaussing coils.
9. Remove the CRT grounding strap and spring
tension
4. Remove the chassis assembly.
5. Loosen the neck assembly fi xing screw and remove.
6. Loosen the defl ection yoke fi xing screw and remove.
7. Place the set with the CRT face down on a cushion
and remove the degaussing coil holders.
8. Remove the degaussing coils.
9. Remove the CRT grounding strap and spring
tension
devices.
10. Unscrew the four CRT fi xing screws [located on
each CRT corner] and remove the CRT
[Take care not to handle the CRT by the neck].
each CRT corner] and remove the CRT
[Take care not to handle the CRT by the neck].
1-4. PICTURE TUBE REMOVAL
WARNING: BEFORE REMOVING THE ANODE CAP
High voltage remains in the CRT even after the power is disconnected. To avoid electric shock,
discharge CRT before attempting to remove the anode cap. Short between anode and CRT
coated earth ground strap.
High voltage remains in the CRT even after the power is disconnected. To avoid electric shock,
discharge CRT before attempting to remove the anode cap. Short between anode and CRT
coated earth ground strap.
ANODE CAP REMOVAL PROCEDURE
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electric shock, discharge CRT before attempting to
remove the anode cap. After removing the anode cap, short circuit to either the metal chassis, CRT shield, or carbon painted on the CRT.
remove the anode cap. After removing the anode cap, short circuit to either the metal chassis, CRT shield, or carbon painted on the CRT.
NOTE: After removing the anode cap, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield or carbon
painted on the CRT.
painted on the CRT.
REMOVAL PROCEDURES
a
b
Anode Button
c
Turn up one side of the rubber cap in
the direction indicated by arrow a .
the direction indicated by arrow a .
Use your thumb to pull the rubber
cap fi rmly in the direction indicated
by arrow b .
cap fi rmly in the direction indicated
by arrow b .
When one side of the rubber cap separates from
the anode button, the anode cap can be removed
by turning the rubber cap and pulling it in the
direction of arrow c .
the anode button, the anode cap can be removed
by turning the rubber cap and pulling it in the
direction of arrow c .
HOW TO HANDLE AN ANODE CAP
1. Do not use sharp objects which may cause damage to the surface of the anode
cap.
2. To avoid damaging the anode cap, do not squeeze the rubber covering too
hard. A material fi tting called a shatter-hook terminal is built into the rubber.
3. Do not force turn the foot of the rubber cover. This may cause the shatter-hook
terminal to protrude and damage the rubber.
Coated
Earth
Ground
Strap
3
4
6
5
2
9
8
10
7
1
KD-30XS955/34XS955
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KD-30XS955/34XS955
CABLE WIRE DRESSING
NOTE: IF THE WIRE DRESSING IS NOT DONE PROPERLY, IT MAY CAUSE DISTORTION
CHASSIS WIRE DRESSING DETAIL -1
CHASSIS WIRE DRESSING DETAIL -1
x3 11mm purselock (p/n: 3-703-983-02)
(NOTE positions of purselocks on main cable bundle.)
(NOTE positions of purselocks on main cable bundle.)
CRITICAL POINT:
Main cable bundle MUST be dressed as LOW
as possible between cement resistor and heat sink.
Wires cannot touch heat sink (sharp edges) or the
cement resistor (very hot).
Main cable bundle MUST be dressed as LOW
as possible between cement resistor and heat sink.
Wires cannot touch heat sink (sharp edges) or the
cement resistor (very hot).
CHASSIS WIRE DRESSING DETAIL -2
1-900-805-24 ground wire attached here
on Antenna Switch
on Antenna Switch
Pin Plug Cable 1-534-630-23
conect like this
conect like this
Add gasket nect to connection with
W-box (avoid cable touching shield case)
W-box (avoid cable touching shield case)
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