DOWNLOAD Sony KV-SW252M50 Service Manual ↓ Size: 5.37 MB | Pages: 69 in PDF or view online for FREE

Model
KV-SW252M50
Pages
69
Size
5.37 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-sw252m50.pdf
Date

Sony KV-SW252M50 Service Manual ▷ View online

– 3 –
KV-SW252M50/M80
   RM-GA002
Diagnosis
Item
Description
• No Power
• +B overcurrent
(OCP)
• Vertical NG.
• IK (AKB)
• Supply Voltage
Protection
Detected
Symptoms
• Power does not turn on.
• No power is supplied to the
TV.
• AC power supply is faulty.
• Power does not turn on.
• Load on power line is
shorted.
• Has entered standby state
after horizontal raster.
• Vertical deflection pulse is
stopped.
• Power line is shorted or
power supply is stopped.
• No raster is generated.
• CRT cathode current
detection reference pulse
output is small.
• No power supply to CRT
ANODE.
• No RASTER is generated.
SELF DIAGNOSTIC FUNCTION
No. of times
STANDBY
Indicator flashes
Does not light
2 times
4 times
5 times
8 times
Diagnostic Result
on screen display
2:0
2:1 ~ 255
4:0
4:1 ~ 255
5:0
5:1 ~ 255
8:0
8:1 ~ 255
Probable
Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out (F4601)
(F Board)
• H.OUT (Q511) is shorted.
(A board)
• IC751 is shorted.
(C/CV Board)
• +13V is not supplied.
(A Board)
• IC503 voltage list is faulty.
(A Board)
• Video OUT (IC751) is faulty.
(C Board)
• IC001 is faulty. (A Board)
• Screen (G2) is improperly
adjusted.
• IC604 faulty.
• IC607 faulty.
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY Indicator will automatically
begin to flash.
The number of times the STANDBY Indicator flashes translates to a probable source of the problem.If an error symptom
cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to
reveal past problems and how often these problems occur.
1. DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY Indicator will flash a number of times to indicate the possible cause of the
problem. If there is more than one error, the Indicator will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.
2. STANDBY INDICATOR BLINKING PROCESS
The example above represents for 4 times blink
Lamp OFF 3 seconds 
Lamp ON 300ms
Lamp OFF 300ms
3. STANDBY INDICATOR ON TV FRONT PANEL
Standby indicator
– 4 –
KV-SW252M50/M80
   RM-GA002
[+B overcurrent $OCP%]
Occurs when an overcurrent on the +B(135V) line is detected by pin 97 of IC001 (A board).
If the voltage of pin 97 of IC001 (A board) is more than 4V, the unit will automatically go to
standby.
[V-PROTECT]
Occurs when an absence of the vertical deflection pulse is detected by pin 116 of IC001
(A board).
[IK $AKB%]
If the RGB levels* do not balance within 15 sec after the power is turned on, this error will be
detected by IC001 (A board). TV will stay on, but there will be 5 times LED blinking.
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to
improper power supply to IC001. TV cuts off high voltage power of anode CRT. No picture will be
detected. eg: IC602, IC604 go faulty.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V.OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
FROM
C BOARD
IC751 PIN 5
IK
EHTO
RED LED
DISPLAY
SDA1
V.GUARD
SDA
5
F.B-PLS
3
116
45
97
7
A BOARD
FROM
Q816
COLLECTOR
30
POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR
4. SELF DIAGNOSTIC SCREEN DISPLAY
5. HANDLING SELF DIAGNOSTIC SCREEN DISPLAY
6. SELF-DIAGNOSTIC CIRCUIT
2 : 
000
3 :
N/A
4 :
000
5 :
001
8 :
002
101 :
N/A
"0" means no fault has been detected.
"1" means a fault has been detected.
"2" means two faults has been detected.
"N/A" means not available for this models.
SELF DIAGNOSTIC
5
8
No.
Description
Method
1.
Display self diagnostic screen
[Display] t [Channel    ] t [Volume    ] t [Power / TV]
Note: The above must be performed while TV is on standby mode.
2.
Stop standby flash
i) Turn off power switch on main.
ii) Unplug power cord from the outlet.
3.
Clear fault result
In Self Diagnostic Screen, press, 
[Channel    ] t 
-
Note: Diagnostic results display on screen is not automatically cleared. Therefore,
clear result after completion of repair.
4.
Quit self diagnostic screen
Turn off power switch of remote commander or main unit.
– 5 –
KV-SW252M50/M80
   RM-GA002
SECTION 1
DISASSEMBLY
1-2.
SPEAKER REMOVAL
1-3.
CHASSIS ASSY REMOVAL
1-4.
SERVICE POSITION
1-5.
TERMINAL BRACKET REMOVAL
1-1.
REAR COVER REMOVAL
1-6.
F2 AND J3 BOARDS REMOVAL
2 Rear cover
1 Nine screws
     (+BVTP 4 × 16)
2 Two screws
     (Washer Head) 
     (+P4x16)
3 One screw
    (+BVTP 3 
× 12)
1 One screw
     (+BVTP 4 
× 16 Type2 IT-3)
4 One screw
    (+BVTP 3 
× 12)
2 Terminal bracket
2 hooks
3 F2 Board
1 J3 Board
2 Two screws
     (+BVTP 3 × 12 Type2 IT-3)
– 6 –
KV-SW252M50/M80
   RM-GA002
1-9.
A BOARD REMOVAL
1-7.
F1 BOARD REMOVAL
1-8.
H4 and H7 BOARDS REMOVAL
2 F1 Board
1 Two hooks
3 One screws
     (+BVTP 3 × 12 Type2 IT-3)
3 Four hooks
1 Five hooks
2 H7 Board
4 H4 Board
5 Five screws
    (3 
× 12)(+) BVTAP
3 Four hooks
2 A Board
Page of 69
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Sony KV-SW252M50 Service Manual ▷ Download

  • DOWNLOAD Sony KV-SW252M50 Service Manual ↓ Size: 5.37 MB | Pages: 69 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony KV-SW252M50 in PDF for free, which will help you to disassemble, recover, fix and repair Sony KV-SW252M50 TV. Information contained in Sony KV-SW252M50 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.