DOWNLOAD Sony KV-21FA240 Service Manual ↓ Size: 8.6 MB | Pages: 60 in PDF or view online for FREE

Model
KV-21FA240
Pages
60
Size
8.6 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-21fa240.pdf
Date

Sony KV-21FA240 Service Manual ▷ View online

KV-21FA240
KV-21FA240 
8
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
 
DISPLAY
  
 Channel  5      
 Sound Volume  -  
 
 POWER
 
 
Note that this differs from entering the Service Mode (Sound Volume  +  ).
The following screen will be displayed indicating the error count:
 
SELF DIAGNOSTIC
OCP 
:  0
OVP 
:  N/A
VSTOP 
:  0 
Number “0” means that no fault was detected.
AKB 
:  1 
Number “1” means a fault was detected one time only.
SUP 
:   0
101  WDT 
:   N/A
SERIAL:
MODEL: 
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 displ�
Clearing the Result Display
To clear the re�
Channel  8 
  0
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.
Self-Diagnostic Circuit
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V. OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
IK
FROM
C BOARD
IC751 PIN 5
EHTO
FROM
A BOARD
Q816
COLLECTOR
32
RED-LED
F.B-PLS
V. GUARD
SDAO
SDA
DISPLAY
84
3
13
122
5
109
+B overcurrent (OCP) 
Occurs when an overcurrent on the +B (135V) line is detected by pin 32 of IC001 (A Board). If the voltage of pin 32 of IC001 (A Board) is more than 4V 
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off. 
V-Protect 
Occurs when an absence of the vertical deflection pulse is detected by pin 13 of IC001 (A Board). Power supply will shut down when waveform interval 
exceeds 2 seconds. 
IK (AKB) 
If the RGB levels* do not balance within 15 seconds after the power is turned on, this error will be detected by IC001 (A Board). TV will stay on, but there 
will be no picture.
Power Supply NG (+5V) for Video Processor 
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to improper power supply to IC001. The TV cuts off high voltage 
power of anode CRT. No picture will be detected. eg: faulty IC602 or IC604
KV-21FA240
KV-21FA240 
9
1-1.  REAR COVER REMOVAL
SECTION 1:  DISASSEMBLY
1-2. CHASSIS ASSEMBLY REMOVAL
1  Remove 8 screws
       +BVTP 4X16
2  Remove rear cover
Chassis Assembly
2
1
2
A Board
1
3
1  Release power cord.
2  Press on catch tab to release A Board.
3  Gently pull the chassis forward.
C Board
J Board
KV-21FA240
KV-21FA240 
10
1-3. SERVICE POSITION
1  Press on catch tab to release A Board.
2  Gently pull the A Board forward to access the CN200 connector (to speakers)
3  Disconnect the CN200 from the A Board.
4  Gently continuing pulling the A Board and rotate into service position.
5  Reconnect CN200.
A Board
C Board
J Board
KV-21FA240
KV-21FA240 
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.
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.
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].
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.
 
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. 
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  .
Use your thumb to pull the rubber
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  .
a
b
Anode Button
c
4
1
10
9
8
7
6
3
5
2
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