samsung CN565BWC-XBG, CN565BWX-DRI, CN765DWC-XBG, CN765DWX-DRI Service Manual

COLOR TELEVISION RECEIVER

Chassis : KCT57A
Model: CN565BWC/XBG

CN565BWX/DRI
CN765DWC/XBG
CN765DWX/DRI

COLOR TELEVISION RECEIVER CONTENTS

Precautions

Specifications and IC Data

Alignment and Adjustment

Troubleshooting

Exploded View and Parts List

Electric Parts List

Block Diagram

PCB Layout Diagram

Wiring Diagram

Schematic Diagrams

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

ELECTRONICS

© Samsung Electronics Co., Ltd. MAY 1998

Printed in Korea

3KCT57A-6502

1. Precautions

1-1 Safety Precautions

1. Be sure that all of the built-in protective
devices are replaced. Restore any missing
protective shields.

2. When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including: nonmetallic control knobs
and compartment covers.

3. Make sure that there are no cabinet openings
through which peopleÑparticularly
childrenÑmight insert fingers and contact
dangerous voltages. Such openings include
the spacing between the picture tube and the
cabinet mask, excessively wide cabinet

ventilation slots, and improperly fitted back

covers.

If the measured resistance is less than 1.0
megohm or greater than 5.2 megohms, an
abnormality exists that must be corrected
before the unit is returned to the customer.

4. Leakage Current Hot Check (Figure 1-1):
Warning: Do not use an isolation
transformer during this test. Use a leakage­current tester or a metering system that
complies with American National Standards
Institute (ANIS C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).

5. With the unit completely reassembled, plug
the AC line cord directly into the power
outlet. With the unitÕs AC switch first in the
ON position and then OFF, measure the
current between a known earth ground (metal
water pipe, conduit, etc.) and all exposed
metal parts, including: antennas, handle
brackets, metal cabinets, screwheads and
control shafts. The current measured should
not exceed 0.5 milliamp. Reverse the power­plug prongs in the AC outlet and repeat the
test.

Fig. 1-1 AC Leakage Test

6. Antenna Cold Check:
With the unitÕs AC plug disconnected from the
AC source, connect an electrical jumper across
the two AC prongs. Connect one lead of the
ohmmeter to an AC prong. Connect the other
lead to the coaxial connector.

7. X-ray Limits:
The picture tube is especially designed to pro­hibit X-ray emissions. To ensure continued
X-ray protection, replace the picture tube only
with one that is the same type as the original.
Carefully reinstall the picture tube shields and
mounting hardware; these also provide X-ray
protection.

8. High Voltage Limits:
High voltage must be measured each time ser­vicing is done on the B+, horizontal deflection
or high voltage circuits. Correct operation of
the X-ray protection circuits must be
reconfirmed whenever they are serviced.

(X-ray protection circuits also may be called

Òhorizontal disableÓ or Òhold-downÓ.)

Heed the high voltage limits. These include
the XÐray Protection Specifications Label, and
the Product Safety and X-ray Warning Note on
the service data schematic.

Precautions

Samsung Electronics 1-1

LEAKAGE
CURRENT

TESTER

DEVICE
UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

0.5mA)

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential
hazards such as electrical shock and X-rays.

1-1 Safety Precautions (Continued)

9. High voltage is maintained within specified
limits by close-tolerance, safety-related
components and adjustments. If the high
voltage exceeds the specified limits, check
each of the special components.

10. Design Alteration Warning:
Never alter or add to the mechanical or
electrical design of this unit. Example: Do not
add auxiliary audio or video connectors. Such
alterations might create a safety hazard. Also,
any design changes or additions will void the
manufacturerÕs warranty.

11. Hot Chassis Warning:
Some TV receiver chassis are electrically
connected directly to one conductor of the AC
power cord. If an isolation transformer is not
used, these units may be safely serviced only
if the AC power plug is inserted so that the
chassis is connected to the ground side of the
AC source.

To confirm that the AC power plug is inserted
correctly, do the following: Using an AC
voltmeter, measure the voltage between the
chassis and a known earth ground. If the
reading is greater than 1.0V, remove the AC
power plug, reverse its polarity and reinsert.
Re-measure the voltage between the chassis
and ground.

12. Some TV chassis are designed to operate with
85 volts AC between chassis and ground,
regardless of the AC plug polarity. These units
can be safely serviced only if an isolation
transformer inserted between the receiver and
the power source.

13. Some TV chassis have a secondary ground
system in addition to the main chassis ground.
This secondary ground system is not
isolated from the AC power line. The two
ground systems are electrically separated by
insulating material that must not be defeated
or altered.

14. Components, parts and wiring that appear to
have overheated or that are otherwise
damaged should be replaced with parts that
meet the original specifications. Always
determine the cause of damage or overheat­ing, and correct any potential hazards.

15. Observe the original lead dress, especially
near the following areas: Antenna wiring,
sharp edges, and especially the AC and high
voltage power supplies. Always inspect for
pinched, out-of-place, or frayed wiring. Do
not change the spacing between components
and the printed circuit board. Check the AC
power cord for damage. Make sure that leads
and components do not touch thermally hot
parts.

16. Picture Tube Implosion Warning:
The picture tube in this receiver employs
Òintegral implosionÓ protection. To ensure
continued implosion protection, make sure
that the replacement picture tube is the same
as the original.

17. Do not remove, install or handle the picture
tube without first putting on shatterproof
goggles equipped with side shields. Never
handle the picture tube by its neck. Some
Òin-lineÓ picture tubes are equipped with a
permanently attached deflection yoke; do not
try to remove such Òpermanently attachedÓ
yokes from the picture tube.

18. Product Safety Notice:
Some electrical and mechanical parts have
special safety-related characteristics which
might not be obvious from visual inspection.
These safety features and the protection they
give might be lost if the replacement compo­nent differs from the originalÑeven if the
replacement is rated for higher voltage,
wattage, etc.

Components that are critical for safety are
indicated in the circuit diagram by shading,
( ) or ( ).

Use replacement components that have the
same ratings, especially for flame resistance
and dielectric strength specifications.
A replacement part that does not have the
same safety characteristics as the original
might create shock, fire or other hazards.

Precautions

1-2 Samsung Electronics

!

1-2 Servicing Precautions

1. Servicing precautions are printed on the
cabinet. Follow them.

2. Always unplug the unitÕs AC power cord from
the AC power source before attempting to: (a)
Remove or reinstall any component or
assembly, (b) Disconnect an electrical plug or
connector, (c) Connect a test component in
parallel with an electrolytic capacitor.

3. Some components are raised above the printed
circuit board for safety. An insulation tube or
tape is sometimes used. The internal wiring is
sometimes clamped to prevent contact with
thermally hot components. Reinstall all such
elements to their original position.

4. After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the portion around
the serviced part has not been damaged.

5. Check the insulation between the blades of the
AC plug and accessible conductive parts
(examples: metal panels, input terminals and
earphone jacks).

6. Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the
power switch ON. Connect an insulation
resistance meter (500V) to the blades of the AC
plug.

The insulation resistance between each blade
of the AC plug and accessible conductive parts
(see above) should be greater than 1 megohm.

7. Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of
its assemblies) unless all solid-state heat sinks
are correctly installed.

8. Always connect a test instrumentÕs ground
lead to the instrument chassis ground before
connecting the positive lead; always remove
the instrumentÕs ground lead last.

Precautions

Samsung Electronics 1-3

Warning1: First read the “Safety Precautions” section of this manual. If some unforeseen circumstance creates a conflict between

the servicing and safety precautions, always follow the safety precautions.

Warning2: An electrolytic capacitor installed with the wrong polarity might explode.

1. Some semiconductor (Òsolid stateÓ) devices
are easily damaged by static electricity. Such
components are called Electrostatically
Sensitive Devices (ESDs); examples include
integrated circuits and some field-effect
transistors. The following techniques will
reduce the occurrence of component damage
caused by static electricity.

2. Immediately before handling any semicon
ductor components or assemblies, drain the
electrostatic charge from your body by
touching a known earth ground. Alternatively,
wear a discharging wrist-strap device. (Be
sure to remove it prior to applying powerÑ
this is an electric shock precaution.)

3. After removing an ESD-equipped assembly,
place it on a conductive surface such as
aluminum foil to prevent accumulation of
electrostatic charge.

4. Do not use freon-propelled chemicals. These
can generate electrical charges that damage
ESDs.

5. Use only a grounded-tip soldering iron when
soldering or unsoldering ESDs.

6. Use only an anti-static solder removal device.
Many solder removal devices are not rated as
Òanti-staticÓ; these can accumulate sufficient
electrical charge to damage ESDs.

7. Do not remove a replacement ESD from its
protective package until you are ready to
install it. Most replacement ESDs are
packaged with leads that are electrically
shorted together by conductive foam,
aluminum foil or other conductive materials.

8. Immediately before removing the protective
material from the leads of a replacement ESD,
touch the protective material to the chassis or
circuit assembly into which the device will be
installed.

9. Minimize body motions when handling
unpackaged replacement ESDs. Motions such
as brushing clothes together, or lifting a foot
from a carpeted floor can generate enough
static electricity to damage an ESD.

Precautions

1-4 Samsung Electronics

1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

Specifications and IC Data

Samsung Electronics 2-1

2. Specifications and IC Data

2-1 Specifications

Model

Television System :
Channels :

Intermediate Frequencies :

Picture Tube :
Power Requirements :
Antenna Input Impedance :
Speaker Impedance :
Protection :

CN7202A CN663A CN565B

NTSC-M, PAL-M, PAL-N
VHF : CH 2 ~ CH 13

UHF : CH 14 ~ CH 69
CATV : CH 1, CH 14 ~ CH 125

Picture IF Carrier : 45.75 MHz
Sound IF Carrier : 41.25 MHz
Color Sub Carrier : 42.17 MHz

A68KVL74X01 A62QBB791X001 A53QCX891X01
AC100~240V, 50/60Hz
75 ohm unbalanced type

8 ohm, 5W + 5W 8 ohm, 5W + 5W 8 ohm, 3W + 3W

X-Ray Protect

2-2 IC Line Up

Table 2 - 1 IC Line - Up

Specifications and IC Data

2-2 Samsung Electronics

Loc No

SF101

SF102

IC201

IC202

IC301

IC603

IC602

IC701

IC801

IC802

IC901

IC902

ICH01

ICD01

Specification

M3951M

M9260M

TDA8375

LA7510

TDA8350Q

TDA7057AQ

mPC 1460HA

TDA4053

STR6709

STR5705

KA7630

RM168E

XLS25C02P

TDA4665

TDA9850

RemarksDescription

SAW FILTER (VIF)

SAW FILTER (SIF)

ONECHIP TV PROCESSOR

AUDIO IF AMP/4.5M DETECT

VERTICAL AMP IC

SOUND AMP IC

VOLUME CONTROL IC

SWITCHING IC

POWER IC

POWER IC (CN565B)

MULTI REGULATOR IC

MICOM

EEPROM

PAL-1H-DELAY

MTS IC

No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

2-3 Semiconductor Base Diagrams

Specifications and IC Data

Samsung Electronics 2-3

ELECTROLYTIC­CONDENSER

IC

DIODE

XLS24C02P (PIN 8)
TDA8375 (PIN 56)
RM168E (PIN 42)
TDA9850 (PIN 22)
TDA4053 (PIN 16)

IC

TRANSISTOR TRANSISTOR

TDA8133
TDA8356

KA7812
KA7809

IN

G

out

C2331-Y
KSR1010

TRANSISTOR

TRANSISTOR

KSC2073
KSA940
2SD1887
2SD1880
KSD5072

B

C

E

E B C

KSC815Y
KSA539-Y

M3951M
M9260M

SAW-FILTER

1

E C B

Fig. 2-1 Semiconductor Base Diagrams

Specifications and IC Data

2-4 Samsung Electronics

2-4 One Chip TV-processor

Fig. 2-2 SDIL56

CVBS : Composite Video Blanking Signal

26
27
28

17
18
19
20
21

22
23
24
25

1

2
3
4
5
6

7
8

9

10
11
12

13
14
15
16

56
55
54
53
52
51

50
49
48
47
46
45
44
43
42
41
40

39
38
37
36
35
34
33
32

31
30
29

SOUND IF INPUT

EXT AUDIO INPUT

VCO REF FILTER

VCO REF FILTER

PLL LOOP FILTER

IF VIDEO OUTPUT

BUSINPUT : SCL

BUSINPUT : SDA

BANDGAP DECOUPLING

CHROMA INPUT

Y/CVBS INPUT

MAIN POSITIVE SUPPLY

INT CVBS INPUT

GROUND

AUDIO OUT

DECOUPLING FILTER TUNING

EXT CVBS INPUT

BLACK CURRENT INP

BLUE OUTPUT

GREEN OUTPUT

RED OUTPUT

V-GUARD INP/BEAM CUR LIMITER

RED INPUT

GREEN INPUT

BLUE INPUT

PIP/OSD RGB INSERTION SWITCH INP

LUMINANCE INPUT

LUMINANCE OUTPUT

DECOUPLING SOUND DEMODULATOR
AUDIO DEEMPHASSIS/MPX OUT
TUNER AGC OUTPUT

AGC DECOUPLING CAPACITOR
REREFERENCE CURRENT INPUT
VERT, SAWTOOTH CAPACITOR

EHT/OVERVOLTAGE PROTECTION INP
(X-RAY PROTECTION)

IF INPUT

IF INPUT

VERT. DRIVE NEG
VERT. DRIVE POS
EAST-WEST DRIVE

GROUND

PHI1 FILTER
PHI2 FILTER / FLASH PROT
SAND CASTLE OUTPUT/FLYBACK INP
HOR. OUTPUT

POSITIVE SUPPLY

LOOP FILTER BURST PHASE DET

X-TAL (PAL-N (4.43)/PAL-M (3.58))
X-TAL (3.58)

SECAM REF OUTPUT

(R-Y) INPUT
(B-Y) INPUT
(R-Y) OUTPUT

(B-Y) OUTPUT

CVBS OUTPUT

BLACK PEAK HOLD CAPACITOR

SDIL56

Alignment and Adjustments

Samsung Electronics 3-1

3. Alignment and Adjustments

3-1 Preadjustment

1. Since there are no VRs in the KCT52A chassis,
all adjustments after parts replacement must
be done in the Service Mode.

2. The Factory Mode adjustments are necessary
when either the EEPROM (IC902) or the CRT
is replaced.

3. Do not tamper with the Ò AdjustmentÓ screen
of the Factory Mode menu. This screen is
intended only for factory use.

3-1-1 When EEPROM (IC902) Is Replaced

1. When IC902 is replaced, all adjustment data
revert to their initial values. It is necessary to
re-program this data.

2. After IC902 is replaced, warm up the TV for
10 seconds.

Make the following adjustments AFTER set­ting up purity and convergence:

White Balance
Sub-Brightness
Vertical Center
Vertical Size
Horizontal Size (No use in 21Ó and 25Ó mod­els)

3-2 Factory (“SERVICE”) Mode

1. The set must be in Factory (ÒServiceÓ) Mode.
Selection sequence:
STAND-BY ® MUTE ® 1 ® 8 ®2®POWER ON

2. The Ò FACTORY MODEÓ message will be displayed. The Factory Mode
has four components : Adjustment, Test Pattern, Set Option Byte, and
Factory Reset.

3. Access the Adjustment Mode by pressing the ÒVOLUMEÓ keys ( . )
The adjustment parameters are listed in the accompanying table.

Select them by pressing the CHANNEL keys (▲,▼).

4. After completing the Factory Mode adjustments, turn the power switch
OFF.

▼

▼

NWA 50
NWP 19
NWC 43
NWT 34
MAT 0
PLA 4
PVL 30
PVS 32
PVA 37
PHS 50
PWA 50
PWP 19
PWC 43
PWT 34

*FACTORY MODE*

Test Pattern
Set Option Byte
Factory Reset

¯

Press VOL

Adjustment

Press CH

Press VOL or

SB 3

POWER OFF

▼

AGC 15
VCO 63
SBT 8
SCT 7
SCR 0
STT 10
RG 32
GG 32
BG 32
SCO 20
NVL 30
NVS 32
NVA 37
NHS 50

¯

▼

NWA 50
NWP 19
NWC 43
NWT 34
MAT 0
PLA 4
PVL 30
PVS 32
PVA 37
PHS 50
PWA 50
PWP 19
PWC 43
PWT 34

AGC 15
VCO 63
SBT 8
SCT 7
SCR 0
STT 10
RG 32
GG 32
BG 32
SCO 20
NVL 30
NVS 32
NVA 37
NHS 50

¯

¯

▼

▼

3-2-1 Adjustment

1. Selection sequence :
STAND-BY ® MUTE ® 1 ® 8 ® 2 ® POWER ON

2. Example : Sub-bright Adjustment

Alignment and Adjustments

3-2 Samsung Electronics

CN765D

SEASA(01) ;SEDA (01)
SEASA(41) ;SEDA (61)

CN565B

15
63

8
7

0
10
20
20
20
09
32
32
13
40
51

0

0
32

0

8
¨
¨
¨
¨
¨
¨
¨
03
51
¨
¨

45+3

¨
¨

1.2

2.4V

3.8V

_

Table 3 - 1 Memor y Specification

FUNCTION

A
D
J
U
S
T

M

E
N
T

M

P
X

OPTION

WHITE/

BALANCE

OTHERS

MODE

(OSD)
AGC
VCO
SBT
SCT
SCR
STT
RG
GG
BG
SCO
NSL (PSL)
NVS (PVS)
NVA (PVA)
NHS (PHS)
HWA (PWA)
NWP (PWP)
NWC (PWC)
NWT (PWT)
MAT
PLA
ST
SP
LEV
AL1
AL2
AL3
ADJ
BYTE 0
BYTE 1

CN7202WA

15
63

8
7

0
10
32
32
32
15
20
32
28
50
39
36
21
26

0

0

7

7

9
20
10

0

0
00
61

290
300

37+3

290
300

1.0

2.0V

3.8V

CN663A

15
63

8
7

0
10
32
32
32
20
30
32
37
50
50
19
43
34

0

4

7

7

9
20
10

0

0
01
51

290
300

45+3

290
300

1.0

2.4V

3.8V

RANGE

63

127

15
13
13
13
63
63
63
63
63
63
63
63
63
63
63
63

1
10
15
15
15
31
31

7

1

00-FF
00-FF

HIGH

LOW

MEASURING-PLUS ADJUSTMENT (W/B)

AGC ADJUSTMENT (CHASSIS OPERATING TEST)

MICOM

(INITIAL DATA)

8

63

8
7

0
10
32
32
32
20
25
32
45
46
50
44
32
32

0

0

7

7

9
20
10

0

0
00
00

x

y

z

x

y

z

No

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20

1

2

3

4

5

6

7

1

2

_

_

FIXED DATA

Alignment and Adjustments

Samsung Electronics 3-3

MEMORY SPECIFICATION (FOR SOUTH AMERICA)

Alignment and Adjustments

3-4 Samsung Electronics

3-2-2 Test Pattern (Aging Mode)

1. This mode can be used to confirm that the convergence and purity
adjustments are correct.

2. Access the Test Pattern parameters by pressing the CHANNEL keys

(▲,▼) while the Service Mode is on. The cursor will move to the

test pattern. Press the VOLUME keys. On-screen display:

3-2-3 V2 Tri-Norma Option Table

3-2-3(A) OPTION BYTE 0

RED
GREEN
BLUE

Table 3-2 Option Byte 0

DATA

D7

D6

D5

D4

D3

D2

D1

D0

FUNCTION

0 : RG, BG 10 STEP UO IN MOVIE, SPORTS
1 : RG,BG 5 STEP UP

0 : AIR/STD/HRC/IRC
1 : AIR/STD/HRC/AFN

0

0 : NR
1 : NONE NR

0 : AUTO SOUND MUTE (WHEN NO SIGNAL)
1 :

0 : NO AUTO OFF
1 : AUTO POWER OFF (WHEN NO SIGNAL FOR 20 MINUTES)

0 : NO LAST POWER
1 : LAST POWER (FOR STORE/DEMO)

0 : 4 : 3 CRT
1 : 12.8 : 9 CRT

NAME

RB_5_UP

AFN OP

(NOT USED)

0

-

NR

AUTO MUTE

AUTO OFF

AUTO POWER ON

f_normal_CRT

FIRST DIGIT

(HEX)

SECOND DIGIT

(HEX)

Alignment and Adjustments

Samsung Electronics 3-5

Table 3-2 Option Byte 1

DATA

D7

D6

D5

D4

D3

D2

D1

D0

FUNCTION

0 : VID DATA = 0
1 : VID DATA = 1

0 : INTERNAL AV SWITCHING
1 : AV PORT SWITCHING

00 : ENGLISH. 01 : SPANISH. 10 : PORTUGUESE

0 : VIDEO MUTE (WHEN CHANNEL CHANGED.)
1 : NO VIDEO MUTE

0 : NONE S-VIDEO
1 : S-VIDEO

0 : NO COMB FILTER
1 : COMB FILTER

0 : NONE MPX
1 : MPX

NAME

VID

f_AvSwPortEn

LANGUAGE

f_no_vmute

S-VIDEO OP

COMBFILTER

MPX OP

3-2-3(B) OPTION BYTE 1

Values Expressed In Hexadecimal Numbers :

FIRST DIGIT

(HEX)

SECOND DIGIT

(HEX)