DOWNLOAD Sony KV-SZ252M50 (serv.man2) Service Manual ↓ Size: 8.72 MB | Pages: 72 in PDF or view online for FREE

Model
KV-SZ252M50 (serv.man2)
Pages
72
Size
8.72 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-sz252m50-sm2.pdf
Date

Sony KV-SZ252M50 (serv.man2) Service Manual ▷ View online

– 4 –
KV-SZ252M50/M61/M81/N50/N60
RM-GA002
[+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, the unit will automatically go to
standby.
[V-PROTECT]
Occurs when an absence of the vertical deflection pulse is detected by pin 13 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
IC503
V.OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
FROM
CV BOARD
IC751 PIN 5
IK
EHT0
RED LED
DISPLAY
SDA1
V.GUARD
SDA
5
F.B-PLS
3
13
84
32
122
A BOARD
FROM
Q816
COLLECTOR
99
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-SZ252M50/M61/M81/N50/N60
RM-GA002
SECTION 1
DISASSEMBLY
1-2.
SPEAKER REMOVAL
1-3.
CHASSIS ASSY REMOVAL
1-4.
SERVICE POSITION
1-5.
A AND H2 BOARD REMOVAL
1-1.
REAR COVER REMOVAL
1 Nine screws
     (+BVTP 4 × 16)   
2 Rear cover
1 Two screws
     (Tapping screw) 
     (+PWH 4x16)
2 H2 Board
3 A Board
1 Two hooks
– 6 –
KV-SZ252M50/M61/M81/N50/N60
RM-GA002
• REMOVAL OF ANODE-CAP
Note:
• After removing the anode, short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT
shield or carbon paint on the CRT.
REMOVING PROCEDURES
Turn up one side of the rubber cap in the direction
indicated by the arrow a.
Using a thumb pull up the rubber cap firmly in the direc-
tion indicated by the arrow b.
When one side of the rubber cap is separated from the
anode button,  the anode-cap can be removed by
turning up the rubber cap and pulling it up in the
direction of the arrow 
c.
HOW TO HANDLE AN ANODE-CAP
Do not damage the surface of anode-caps with
sharp shaped objects.
Do not press the rubber too hard so as not to
damage the inside of anode-cap.
A metal fitting called the shatter-hook terminal is
built into the rubber.
Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage
the rubber.
1-6.
PICTURE TUBE  REMOVAL
Note:
Please make sure the TV set is not in standing position before removing necessary CRT support located on bottom
right and left.
1) Remove the rear cover.
2) Unplug all interconnecting leads from the Deflection yoke, Neck assy, Degaussing Coil and CRT grounding strap.
Remove Chassis Assy.
3) Place the TV set with the CRT face down on a cushion jig.
a
a
c
 Anode Button
b
b
4
 Anode Cap Removal
9
 Degaussing Coil
6
 Loosen the Neck Assembly 
fixing screw and remove
Neck Assy
qa
 Loosen the Deflection Yoke
fixing screw and remove
5
 CV Board Removal
8
 Spring Tension(x2) 
Removal
qs
 Supports CRT (x2) 
 Removal
0
 Earth Coating Assy
qd
 Screw Tapping 
     7+ Crown Washer (x4)
7
 Band, DGC Removal
– 7 –
KV-SZ252M50/M61/M81/N50/N60
RM-GA002
SECTION 2
WIRE DRESSING
2-1. Lead Assy, Jumper Wire Dressing at A board
2-3.  Wire Dressing at A and H2 board
2-2.  Lead Assy, Jumper Wire Dressing at A board 
 
 (only for Audio 6+6 Non DSP models)
TVSR:
Connector assy must be kept away
from primary area(10mm minimum).
i) Insert and dress Conn Assy, 4P into hook.
ii) Insert Conn Assy, 5P into CN4105.
  Make sure AC Power Cord is behind Lead Assy,  
  Speaker at CN4106.
W082
W077
P/N 1-923-512-11
W016
Dress both Lead Assy, Jumpers
along edge of shield case
P/N 1-910-026-28
Conn Assy,
5P YUV
CN905
Dress both Lead  
Assy, Jumpers
around CN905, C903
and below Conn
Assy, 5P YUV
C903
Dress Lead Assy, Jumper far
away from C514 and T501
W010
W065
W084
C514
T501
Keep Lead Assy, Jumpers
away from R121
 No. Part 
No. 
Description 
Block 
Remark
 
1 1-910-026-28 
Lead 
Assy, 
Jumper 
A(Var)
 
W016-W084(1)
   
 
 
 
W077-W065(0)
  2 
1-923-512-11  WIRE UL1007 AWG24 150MM ORG 
A(Com)  W082-W010(1)
 No. Part 
No. 
Description 
Block 
Remark
  2 1-910-036-25 
Lead 
Assy, 
Jumper 
A(Var) W075-W085(1)
 
2
1
CN4113
CN3102
CN2105
CN4110
Conn Assy, 4P
CN4106
CN4105
Lead Assy, Speaker
Conn Assy, 5P
AC Power Cord is behind
Lear Assy, Speaker
Conn Assy, 7P
Insert Conn Assy,
4P into hook
W075
P/N 1-910-036-25
L2601
A003
A002
W085
Dress Lead Assy,
Jumper around C249
Dress Lead Assy, Jumper in
between C211 and L2601
C211
UL Tube
Dress between
A003 and A002
CAUTION :
1.  Do not overpull the wires during dressing
--> avoid disconnection of wires.
2.  Make sure wires are kept away from
sharp edges, heatsinks & other
high-temperature parts.
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