Sony KD-27FS130 Service Manual ▷ View online
KD-27FS130
KD-27FS130
8
Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past
occurrences of failure on the screen for confi rmation.
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past
occurrences of failure on the screen for confi rmation.
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
DISPLAY
Channel 5
Sound Volume -
POWER
Self-Diagnostic Screen Display
SELF DIAGNOSTIC
2: +B
OCP 0
3: +B
OVP N/A
4: VSTOP 0
Numeral “0” means that no fault was detected.
5: AKB
1
Numeral “1” means a fault was detected one time only.
101: WDT
N/A
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”.
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.
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”.
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.
Clearing the Result Display
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
Channel 8
ENTER
Quitting the 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.
Self-Diagnostic Circuit
MD BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC561
V. OUT
MD BOARD
IC001
SYSTEM
MD BOARD
IC002
MEMORY
IK-AKBIN
FROM
C BOARD
IC702 PIN 5
I-HLDWN
FROM
A BOARD
IC501
PIN 1
72
O-LED
REF
I-Prot
IO-BDAT
BDA
DISPLAY
51
3
78
79
53
5
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 72 of IC001 (MD Board). If the voltage of pin 72 of IC001 (MD Board) is less than
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
I-Prot
Occurs when an absence of the vertical defl ection pulse is detected by pin 78 of IC001 (MD Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
IK (AKB)
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC001 (MD Board). TV will stay on, but
there will be no picture.
Occurs when an overcurrent on the +B (135V) line is detected by pin 72 of IC001 (MD Board). If the voltage of pin 72 of IC001 (MD Board) is less than
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
I-Prot
Occurs when an absence of the vertical defl ection pulse is detected by pin 78 of IC001 (MD Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
IK (AKB)
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC001 (MD Board). TV will stay on, but
there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects IK).
Note that this differs from entering the Service Mode (Sound Volume + ).
KD-27FS130
KD-27FS130
9
1-1. REAR COVER REMOVAL
SECTION 1: DISASSEMBLY
1-2. CHASSIS ASSEMBLY REMOVAL
1 Remove screws from top of cover.
4 Screws SCREW +BVTP 3X12 TYPE2 TT (B)
2 Remove screws from sides of cover.
4 Screws SCREW +BVTP 3X12 TYPE2 TT (B)-2 each side
3 Remove screws from sides of cover.
4 SCREW +BVTP 4X16 TYPE2 TT (B) - 2 each side
4 Remove rear cover
C Board
V Board
V Board
Chassis Assembly
3
4
2
1
1 Press on catch tab to release the chassis.
2 Gently pull the chassis forward.
1
2
KD-27FS130
KD-27FS130
10
1-3. SERVICE POSITION
1 Disconnect the CN501 cable from the A Board.
2 Press on catch tab to release A Board.
3 Gently pull the A Board forward to access the GS and HS Boards.
4 Gently continuing pulling the A Board, GS Board and HS Board forward to
place in service position.
5 Reconnect CN501.
A Board
GS Board
HS Board
HS Board
KD-27FS130
KD-27FS130
11
1. Discharge the anode of the CRT and remove
the anode cap.
2. Unplug all interconnecting leads from the
defl ection yoke, neck assembly, degaussing
coils and CRT grounding strap.
coils and CRT grounding strap.
3. Remove the C 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.
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].
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. Short between anode and coated earth ground strap of 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.
the anode cap. Short between anode and coated earth ground strap of 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.
REMOVAL PROCEDURES
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.
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 .
a
b
Anode Button
c
4
1
10
9
8
7
6
2
3
5
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