SAMSUNG CS30A7HPTXBWT Service Manual

COLOR TELEVISION RECEIVER

Chassis : SCT53A
Model : CS30A7HPTX/BWT

COLOR TELEVISION RECEIVER CONTENTS

1.

Precautions

2.

Reference Information

3.

Specifications

4.

Disassembly and Reassembly

5.

Alignment and Adjustments

6.

Troubleshooting

7.

Exploded View and Parts List

8.

Electric Parts List

9.

Wiring Diagram

10.

Schematic Diagrams

ELECTRONICS

Samsung Electronics Co., Ltd. APR.1999

©

Printed in Korea

3SCT53A-6705

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)

Reference Information

Samsung Electronics 2-1

2. Reference Information

2-1 Tables of Abbreviations and Acronyms

A
Ah
Å
dB
dBm

°C
°F
°K
F
G
GHz
g
H
Hz
h
ips
kWh
kg
kHz
kΩ
km
km/h
kV
kVA
kW
I
MHz

Ampere
Ampere-hour
Angstrom
Decibel
Decibel Referenced to One
Milliwatt
Degree Celsius
Degree Fahrenheit
degree Kelvin
Farad
Gauss
Gigahertz
Gram
Henry
Hertz
Hour
Inches Per Second
Kilowatt-hour
Kilogram
Kilohertz
Kilohm
Kilometer
Kilometer Per Hour
Kilovolt
Kilovolt-ampere
Kilowatt
Liter
Megahertz

MV
MW
MΩ
m
µA
µF
µH
µm
µs
µW
mA
mg
mH
mI
mm
ms
mV
nF

Ω

pF
Ib
rpm
rps
s
V
VA
W
Wh

Megavolt
Megawatt
Megohm
Meter
Microampere
Microfarad
Microhenry
Micrometer
Microsecond
Microwatt
Milliampere
Milligram
Millihenry
Milliliter
Millimeter
Millisecond
Millivolt
Nanofarad
Ohm
Picofarad
Pound
Revolutions Per Minute
Revolutions Per Second
Second (Time)
Volt
Volt-ampere
Watt
Watt-hour

Table 2-1 Abbreviations

Reference Information

2-2 Samsung Electronics

Table 2-1 Abbreviations

ABL
AC
ACC
AF
AFC
AFT
AGC
AM
ANSI
APC
APC
A/V
AVC
BAL
BPF
B-Y
CATV
CB
CCD
CCTV
Ch
CRT
CW
DC
DVM
EIA
ESD
ESD
FBP
FBT
FF
FM
FS
GND
G-Y
H
HF
HI-FI
IC
IC
IF

Automatic Brightness Limiter
Alternating Current
Automatic Chroma Control
Audio Frequency
Automatic Frequency Control
Automatic Fine Tuning
Automatic Gain Control
Amplitude Modulation
American National Standards Institute
Automatic Phase Control
Automatic Picture Control
Audio-Video
Automatic Volume Control
Balance
Bandpass Filter
Blue-Y
Community Antenna Television (Cable TV)
Citizens Band
Charge Coupled Device
Closed Circuit Television
Channel
Cathode Ray Tube
Continuous Wave
Direct Current
Digital Volt Meter
Electronics Industries Association
Electrostatic Discharge
Electrostatically Sensitive Device
Feedback Pulse
Flyback Transformer
Flip-Flop
Frequency Modulation
Fail Safe
Ground
Green-Y
High
High-Frequency
High Fidelity
Inductance-Capacitance
Integrated Circuit
Intermediate Frequency

I/O
L
L
LED
LF
MOSFET
MTS
NAB
NEC
NTSC
OSD
PCB
PLL
PWM
QIF
R
RC
RF
R-Y
SAP
SAW
SIF
SMPS
S/N
SW
TP
TTL
TV
UHF
UL
UV
VCD
VCO
VCXO
VHF
VIF
VR
VTR
VTVM
TR

Input/output
Left
Low
Light Emitting Diode
Low Frequency
Metal-Oxide-Semiconductor-Field-Effect-Tr
Multi-channel Television Sound
National Association of Broadcasters
National Electric Code
National Television Systems Committee
On Screen Display
Printed Circuit Board
Phase-Locked Loop
Pulse Width Modulation
Quadrature Intermediate Frequency
Right
Resistor & Capacitor
Radio Frequency
Red-Y
Second Audio Program
Surface Acoustic Wave(Filter)
Sound Intermediate Frequency
Switching Mode Power Supply
Signal/Noise
Switch
Test Point
Transistor Transistor Logic
Television
Ultra High Frequency
Underwriters Laboratories
Ultraviolet
Variable-Capacitance Diode
Voltage Controlled Oscillator
Voltage Controlled Crystal Oscillator
Very High Frequency
Video Intermediate Frequency
Variable Resistor
Video Tape Recorder
Vacuum Tube Voltmeter
Transistor

Loc No.

IC101
IC201
IC601
IC602
IC604
IC802
IC803
IC804
IC805
IC806
ICA01
ICA02
IC201
IC202
IC203
IC204
IC206
IC207
IC208
IC209
IC210
IC212
IC211
IC213
IC601
IC602

No.

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

Specification
TDA9810
TDA4780

TDA7265

HCF4053BE

SI3050C

KA812
KA7808
KA7809
S727D
KA393
CIP3250A
VPC3210A
TL7705AC
SDA9280
SDA9272

SDA9253

SDA9362

74F125

74F541
74F08
MSP3410D
74HC4052D

Description

Multi standard VIF-PLL with QSS-IF and AM demodulator
RGB Video Processor

25W+25W Stereo Amplifier with Mute & SY-BY

Audio-Switching

Low-Drip Regulator (5V)

Regulator (12V)
Regulator (8V)
Regulator (9V)
AUTO PLUS
OP AMP
Component Interface Processor
Video Processor
Power-On Reset Generator
Display Processor
VIP

Memory

Digital Deflection controller

Buffer

Buffer
AND-Gate
Multistandard Sound Processor
Audio Switching

Remarks

Reference Information

Samsung Electronics 2-3

2-3 IC Line Up

Table 2-1 IC Line Up

Reference Information

2-4 Samsung Electronics

Loc No.

IC603

IC604
ICD601
ICD602

IC701

IC702

IC703

IC704

IC901

IC902

IC903

IC905

ICT01

ICT02

IC301

IC403

IC801

IC803

IC804

IC805

IC806

IC501

IC502

IC503

IC504

No.

27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

Specification
TDA7050
TL062C
DPL3519A
TL062C

TDA6920X

TL062C

SDA30C264
ST24W16
TMS27C040
SAA1300
SDA5273P
KM44C1000
TDA8351
TDA8145
STR-S6709
TOP210ES
TL431
LTV817B
KA7805

TDA6111Q

TDA2030

Description
AUDIO AMP
OP AMP
Dolby Pro Logic Processor
OP AMP

7 X 5 Video Matrix Switch

OP AMP

8 bit Micro controller ROMILESS
16K EEPROM
512K * 8 EPROM

MEGATEXT IC
DRAM
DC-coupled vertical deflection
EW
SMPS
Stand-by SMPS

Photo-Coupler
Regulator (5V)

Video Output Amplifier

AMP

Remarks

Table 2-1 IC Line Up

Specifications

Samsung Electronics 3-1

3. Specifications

MODEL

CW-30A80SA (CW764AHA)

O
O
O
O

CW-30A90SD (CW764AHD)

O
X

-

-

MAIN
CHARACTERISTICS

SYSTEM

ANTENNA INPUT

POWER

TUBE

NUMBER OF CHANNELS
TUNING RANGE

SOUND OUTPUT

SOCKETS

100 Hz
Dolby Pro Logic
EPG
AV_LINK
TUNING
COLOR
SOUND

CONSUMPTION
REQUIREMENTS

FREQUENCY
SIZE
TYPE

FRONT

BACK (3 SCARTS)

Frequency Synthesizer

PAL, SECAM, NTSC(only AV mode)

NICAM, A2 STEREO, AM

75ohms,Coaxial Cable

180W -

Main Voltage : 230V

Input Range : 220-240V

50Hz/60Hz

30” (76Cm)

12.8:9, 2.5R Invar
100

VHF: 2 ~ 12, UHF : 21 ~ 69, Cable : S1 ~ S41

Right : 15W
Left : 15W
Center : 15W
Surround : 15W (L+R)

Right : 15W
Left : 15W

- RCA : Input/S-VHS

- Headphone Audio Output

- EXT1 : full RGB Scart / AV-LINK

- EXT2 : Scart (Output Selectable)

- EXT3 : Decoder (Output Selectable)

- Surround SPK Jack

- Rear AMP Jack

Specifications are subject to change.

JUMPER
JUMPER

3812-000219
3812-000219

DEL
DEL

DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL
DEL

C-FILM 103
C-FILM 103

C-AL 1000 mF

C-FILM 104

C-AL 1000mF

C-FILM 104
C-FILM 104

C-AL 1000mF

C-AL 1 mF

C-AL 100mF

C-AL 1mF

C-AL 10 mF

3P

IC;TDA7265

IC;4053B
JUMPER
JUMPER
JUMPER

1/2 1.8K
1/2 1.8K
1/2 1.8K
1/2 1.8K

1/2 4.7
1/8 10K
1/8 300
1/8 300

JUMPER
JUMPER

1/8 10K

2301-000380
2301-000380
2401-000192
2301-000530
2401-000192
2301-000530
2301-000530
2401-000192
2401-000603
2401-000318
2401-000603
2401-002265
3711-000900

AA96-50279A

0801-000961
3812-000219
3812-000219
3812-000219
2001-001055
2001-001055
2001-001055
2001-001055
2001-001146
2001-000290
2001-000628
2001-000628
3812-000219
3812-000219
2001-000290

Specifications

3-2 Samsung Electronics

3-1 3D Sound Option Table (Main Board)

CW-30A80A : 3D SOUND

SPECIFICATION

CODE NO

Loc No.

C601
C602
C612
C613
C614
C615
C616
C617
C618
C619
C620

C635
CN17
IC602
IC604

J013

J168

J169

R610

R611

R613

R614

R615

R616

R617

R618

R619

R620

R629

J061

J062

CW-30A90SD : DOLBY SOUND

SPECIFICATION CODE NO

4P, JACK

RCA-2P

AA63-40276A

3722-001158

Loc No.

CN706
CN707

3-2 3D Sound Option Table (AV-Terminal Board)

Specifications

Samsung Electronics 3-3

CW-30A80A : 3D SOUND

SPECIFICATION

CODE NO

CW-30A90SD : DOLBY SOUND

SPECIFICATION CODE NO

RCA-5P 3722-001157

Disassembly and Reassembly

Samsung Electronics 4-1

4. Disassembly and Reassembly

4-1 Back Cover Removal

1

7

2

3

5

4

6

4-2 Speaker Removal

1. After removing the 7 screws, pull the
cabinet backwards.

1. Loosen the 4 screws and remove the
Speaker Holders.

Disassembly and Reassembly

4-2 Samsung Electronics

4-3 CRT Removal

1. Spread a soft mat on the floor. Place the TV set face down.

2. Remove the 4 screws mounting the CRT to the front cabinet.

3. Lift the CRT.

Alignment and Adjustments

Samsung Electronics 5-1

5. Alignment and Adjustments

5-1 General Alignment Instructions

1. Usually, a color TV-VCR needs only slight
touch-up adjustment upon installation. Check
the basic characteristics such as height,
horizontal and vertical sync and focus.

2. Observe the picture for good black and white
details. There should be objectionable color
shading; if color shading is present,
demagnetize, perform purity and convergence
adjustments described below.

3. Use the specified test equipment or its
equivalent.

4. Correct impedance matching is essential.

5. Avoid overload. Excessive signal from a
sweep generator might overload the front-end
of the TV. When inserting signal markers, do
not allow the marker generator to distort test
results.

6. Connect the TV only to an AC power source
with voltage and frequency as specified on the
backcover nameplate.

7. Do not attempt to connect or disconnect any
wires while the TV is turned on. Make sure
that the power cord is disconnected before
replacing any parts.

8. To protect against shock hazard, use an
isolation transformer.

5-2 Automatic Degaussing

A degaussing coil is mounted around the
picture tube, so that external degaussing after
moving the TV should be unnecessary. But
the receiver must be properly degaussed upon
installation.

The degaussing coil operates for about 1
second after the power is switched ON. If the
set is moved or turned in a different direction,
the power should be OFF for at least 10
minutes.

If the chassis or parts of the cabinet become
magnetized, poor color purity will result. If
this happens, use an external degaussing coil.
Slowly move the degaussing coil around the
faceplate of the picture tube and the sides and
front of the receiver. Slowly withdraw the coil
to a distance of about 6 feet before turning
power OFF.

If color shading persists, perform the
following Color purity and Convergence
adjustments.

5-3 High voltage Check

CAUTION: There is no high voltage adjustment on
this chassis. The B+ power supply should be +135
volts
(with full color- bar input and normal picture level).

1. Connect a digital voltmeter to the second
anode of the picture tube.

2. Turn on the TV. Set the Brightness and
Contrast controls to minimum (zero beam
current).

3. Adjust the Brightness and contrast controls to
both extremes. Ensure that the high voltage
does not exceed 32 KV under any conditions.