Sony KD-30XS955 Service Manual ▷ View online
10
KD-30XS955/34XBR960/34XS955/36XS955
KD-30XS955/34XBR960/34XS955/36XS955
+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 (BY 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 (BY 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-30XS955/34XBR960/34XS955/36XS955
KD-30XS955/34XBR960/34XS955/36XS955
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
+BVTP 4 x 16
3 Screws
+BVTP 4 x 16
+BVTP 4 x 16
4 Screws
+BVTP 4 x 16
+BVTP 4 x 16
CAUTION! - Heat sink on IC5004 is -15V. Do not allow heat sink
to touch GND or any other components.
Heat sink on Q8018 VpK=250V, is -15V. Do not touch or
short to GND or any other components.
Heat sink on Q8018 VpK=250V, is -15V. Do not touch or
short to GND or any other components.
CAUTION! - Pay attention to Neck Assembly WY Board wire
harness to BY Board. The WY Board can easily break if
there is sudden or excessive tension on the harness.
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 AZ and DZ Boards in order to
service the unit.
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.
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KD-30XS955/34XBR960/34XS955/36XS955
KD-30XS955/34XBR960/34XS955/36XS955
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.
1. Remove the Sub-Woofer Assemblies.
2. Discharge the anode of the CRT and remove the
anode cap.
3. Unplug all interconnecting leads from the defl ection
yoke, neck assembly, degaussing coils and CRT
grounding strap.
grounding strap.
4. Remove the CX Board from the CRT.
5. Remove the chassis assembly.
6. Loosen the neck assembly fi xing screw and remove.
7. Loosen the defl ection yoke fi xing screw and remove.
8. Place the set with the CRT face down on a cushion
and remove the degaussing coil holders.
9. Remove the degaussing coils.
10. Remove the CRT grounding strap and spring tension
devices.
11. 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].
[Take care not to handle the CRT by the neck].
Coated
Earth
Ground
Strap
5
9
6
4
11
8
1
3
7
10
2
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KD-30XS955/34XBR960/34XS955/36XS955
KD-30XS955/34XBR960/34XS955/36XS955
CABLE WIRE DRESSING
DY-SHIELD (ALL MODELS)
DY
Rotation
COIL
COIL
Rev. 1
6/21/04
6/21/04
DGC Restraint Cable
9mm purselock
attached to
Rotation Coil
ABOVE DY CLIP.
attached to
Rotation Coil
ABOVE DY CLIP.
9mm purselock
Attach to Rotation
Coil ABOVE DY CLIP
Attach to Rotation
Coil ABOVE DY CLIP
Keep DY leads
away from B-Bd
(Noise Problems)
away from B-Bd
(Noise Problems)
NOTE which hole DY
leads are dressed in!
leads are dressed in!
ADHESIVE STRIPS
Place OVER ECG.
ECG MUST touch CRT in
this area!
E.C.G.
E.C.G. Leads
DGC purselock
to hold DY Leads.
to hold DY Leads.
DY
Rotation
COIL
COIL
Cable Tie
To CN504/505
on A-Board
LCC
Coil
(Top)
LCC
Coil
(Top)
Rev. 1
6/28/04
6/28/04
Cable Tie
CN5805
[ DL ]
LCC
Coil
(Bottom)
LCC
Coil
(Bottom)
NOTE: MAKE SURE Cable Tie is
positioned so it does NOT
touch LCC COIL Wires! DO
NOT apply Cable Tie over
white/black LCC Tape!
positioned so it does NOT
touch LCC COIL Wires! DO
NOT apply Cable Tie over
white/black LCC Tape!
NOTE: MAKE SURE wires are
not too tight! Leave some
Slack!
not too tight! Leave some
Slack!
!
!
!
Dress DGC
leads through
leads through
Cable Ties!
DCG/LCC CAUTION POINTS (ALL MODELS)
NOTE: IF THE WIRE
DRESSING IS NOT
DONE PROPERLY,
IT MAY CAUSE
DISTORTION
DRESSING IS NOT
DONE PROPERLY,
IT MAY CAUSE
DISTORTION
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