SAMSUNG CS6202NX-EIS, CS7202NBX-EIS Service Manual

COLOR TELEVISION RECEIVER

Chassis : SCT12B
Model: CS7202NBX/EIS

CS6202NX/EIS

COLOR TELEVISION RECEIVER CONTENTS

Precautions

Specifications and IC Data

Disassembly and Reassembly

Alignment and Adjustments

Troubleshooting

Electric Parts List

System Block Diagrams

PCB Layout Diagram

Wiring Diagram

Schematic Diagrams

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

ELECTRONICS

Samsung Electronics Co., Ltd.SEP. 1997

©

Printed in Korea

3SCT12B-02-65

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)

2. Specifications and IC Data

2-1 Specifications

Television System:

Channels:

Intermediate Frequencies (MHz) :

MODEL

CI
CII
CX
CK

CW

CS

System

Band

VHF
UHF

SYSTEM

IF Carrier Frequency

SYSTEM
PAL-I (UHF)
PAL-I (VHF/UHF)
PAL-B/G, SECAM-B/G
PAL-B/G, D/K, SECAM-B/G, D/K
PAL-B/G, D/K, SECAM-B/G, D/K, NT 4.43
PAL-B/G, D/K, PAL-I, SECAM-B/G, D/K, NT4.43, NT3.58

PAL/SECAM-

B/G,I

2 - 12

21 - 69

PAL/
SECAM- B/G

PAL,
SECAM- D/K

1 - 13

21 - 69

PAL/SECAM-D/K,
SECAM-K1

SECAM-K1,
PAL-D

2 - 9

13 - 57

PAL - I

NTSC - M

NTSC - M

2 - 13
14-69

Picture Tube:

Power Requirements:
Antenna Input Impedance:
Speaker Impedance

Picture IF Carrier

Sound IF Carrier

Color Sub Carrier

25 Inch

28/29 Inch

AC 100~260V, 50/60Hz

VHF, UHF : Telescopic dipole antenna (75 ohm unbalanced type )

8 ohm, 10W+10W (Semi-Dome)

A59KPR84X05 (B)
A59EAK71X01
A68KVM74X02 (B)
A66EAK71X01

38.90

33.40

34.47

38.90

32.40

34.47

SED CPT

PHILIPS CPT

SED CPT

PHILIPS CPT

Quick start, In-line-gun,
Black stripe, 110° degree
deflection

38.90

32.90

34.47

38.90

34.40

35.32

Samsung Electronics

2-1

2-2

Samsung Electronics

Loc. No Specification Description Remark
HIC101 PAP101T IF PRE-AMP
IC201 TDA8374A PAL-B/G, SECAM-B/G

TDA8374A PAL-B/G, SECAM-B/G, NTSC
TDA8374 PAL-B/G, SECAM-B/G, NTSC, SECAM-L
TDA8375A PAL-B/G, SECAM-B/G, NTSC, SECAM-L, E/W ADJ.

TDA8375 PAL-B/G, SECAM-B/G, NTSC, SECAM-L, E/W ADJ.,16:9
IC202 TDA4665 1H DELAY
IC203 TDA8395 SECAM DECODER
IC301 TDA8350Q VERTICAL DEFLECTION AMP
IC401 KA7812 REGULATOR (12V)
IC501 TDA6101Q RGB DRIVE AMP
IC502 TDA6101Q RGB DRIVE AMP
IC503 TDA6101Q RGB DRIVE AMP
IC504 SPK101T SPOT-KILLER
IC601 TDA7394 SOUND-AMP (10W+10W)

TDA7266 SOUND-AMP (7W+7W)
IC801 STR6709 POWER IC (STR)
IC802 TDA8133 CUSTOM REGULATOR (5V, 8V)

IC803 SE130N

ERROR AMP

SED CPT

SE140N PHILIPS CPT
IC804 KA78R05 REGULATOR (5V)
ICT01 SAA5281 P/E TTX-DECODER
ICT02 T900580 TTX-CONTROLLER
ICT04 X24C02 E2-PROM
IC901 Z8933212 µ-com

IC902 AT24C04 E2-PROM

2-2 IC Line Up

Table 2-1 IC Line-Up

2-3

Samsung Electronics

ELECTROLYTIC­CONDENSER

IC

DIODE

TDA4665(Pin 16)
TDA837X(Pin 56)
Z8933112PSC(Pin 42)
X24CO4P(Pin 8)
TDA8395(Pin 16)
TDA4665(Pin 16)

IC

TRANSISTOR TRANSISTOR

TDA8133

KA7812

IN

G

OUT

TRANSISTOR

TRANSISTOR

2SD1651
2SD1650
KSD5072
KSD5071
KSD1711

B

C

E

E B C

KSA815-Y
KSA539-Y

IC

UPC574J

or

KA33V

G1962
K2950M
K9253M

SAW-FILTER

1

E C B

KSR1012
KSR1010
KSR2010

Fig.2-1 Semiconductor Base Diagrams

2-3 Semiconductor Base Diagrams

2-4

Samsung Electronics

Memo

Memo

Samsung Electronics 4-1

4. Alignment and Adjustments

4-1 Preadjustment

4-2 Factory/Service Mode

4-2-1 Procedure for the "Adjustment" Mode

1. This mode uses the standard remote control.
The Service Mode is activated by (1) pressing
the "HIDDEN" service key on the local­keyboard, or (2) by entering the following
remote-control sequence:

STAND-BY®P.STD®HELP®SLEEP®
POWER ON

2. The "SERVICE (FACTORY)" message will be
displayed. The Service Mode has four
components: Adjustment, Test Pattern, Option
Bytes and Reset.

3. Access the Adjustment Mode by pressing the
"VOLUME" keys ( Up or Down).
The adjustment parameters are listed in the
accompanying table. Select them by pressing

the CHANNEL keys (▲,▼).

4. Selection sequences for the PAL system:
DOWN or UP key:

AGC>VCO>SBT>SCT>SCR>RG>GG>BG>
SC>PVS>PVA>PSL>PHS>PEW>PEP>PEC>
PET>LA>SA

5. Selection sequences for the NTSC system:
DOWN or UP key:

NVS>NVA>NSL>NHS>NEW>NEP>
NEC>NET

6. The VOLUME keys increase or decrease the

adjustment values, (stored in the
non-volatile memory when Adjustment Mode
is cancelled).

7. Cancel the Adjustment Mode by re-pressing

the "HIDDEN" or "STATUS" keys.

4-1-1 Factory Mode

1. Do not attempt these adjustments in the Video
Mode.

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

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

4-1-2 When EEPROM (IC902) Is Replaced

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

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

4-1-3 When CRT Is Replaced

1. Make the following adjustments AFTER
setting up after setting up purity and
convergence:
White Balance
Sub-Brightness
Vertical Center
Vertical Size
Horizontal Size
Fail Safe (This adjustment must be the last
step.)

2. If the EEPROM or CRT is replaced, set PSL
and PVA to 15 and 63 (Factory Mode).

4-2

Samsung Electronics

ADJUSTMENT DATA

48 ~ 51
60 ~ 70

9 ~ 10

7

23

5
27
31
31

10 ~ 31
10 ~ 12

31

25 ~ 30
25 ~ 30
40 ~ 45
50 ~ 55

31
31

20 ~25

31

25 ~ 30
25 ~ 30
48 ~ 52
50 ~ 55

31
31

20 ~ 25

75 ~95

50

RANGE

0 ~ 63 STEP

0 ~ 127 STEP

0 ~ 13 STEP
0 ~ 13 STEP
0 ~ 23 STEP

0 ~ 9 STEP
0 ~ 49 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP
0 ~ 63 STEP

0 ~ 127 STEP

0 ~ 63 STEP

OSD ABBREVIATION

AGC
VCO

SBT
SCT
SCR

LA
SA
RG
GG
BG

SC
PSL
PVS
PVA
PHS

PEW

PEP
PEC
PET
NSL

NVS
NVA
NHS

NEW

NEP

NEC

NET
LCO
TSC

FUNCTION
AUTO GAIN CONTROL
VOLTAGE CONTROLLED OSCILLATOR
SUB BRIGHT
SUB CONTRAST
SUB COLOR
LEVEL ADJUSTMENT
STEREO ADJUSTMENT
RED CUTOFF
GREEN CUTOFF
BLUE CUTOFF
S-CORRECTION
PAL VERTICAL SLOPE
PAL VERTICAL SHIFT
PAL VERTICAL AMPLITUDE
PAL HORIZONTAL SHIFT
PAL EW-WIDTH
PAL EW-APRABOLA WIDTH
PAL EW-CORNER PARABOLA
PAL EW-TRAPEZIUM
NTSC VERTICAL SLOPE
NTSC VERTICAL SHIFT
NTSC VERTICAL AMPLITUDE
NTSC HORIZONTAL SHIFT
NTSC EW-WIDTH
NTSC EW-PARABOLA WIDTH
NTSC EW-CORNER PARABOLA
NTSC EW-TRAPEZIUM
SECAM-L CONTROLLED OSCILLATOR
TELETEXT SUB CONTRAST

Table 4-1 Main Adjustment Parameter (Zilog µ-com)

4-2-2 Main Adjustment Parameter

NOTE : PVS,PVA, PHS, NVS, NVA,NHS parameters must be aligned using both the

50Hz and 60Hz vertical-field rates.

Samsung Electronics 4-3

4-2-3 Test Pattern (Aging Mode)

1. This mode can be used during servicing, or for confirming that
the convergence and purity adjustments are correct.

2. Access the Test Pattern parameters by pressing a CHANNEL

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

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

o RED
o GREEN
o BLUE

3. AGING Mode (Reference Only)

This pattern is used for pre-heating the CRT during
manufacturing--it is accessed in the factory by twice pressing the
"HIDDEN" key .

Even if the TV power is cut off, the Aging Mode is not cancelled,
The patterns are displayed at 5 sec intervals. The AGING mode
is cancelled by repressing the "HIDDEN" key.

4-4

Samsung Electronics

BYTE1
TDA837X X-TAL CONTROL (XA/XB = 1/1)
TDA837X X-TAL CONTROL (XA/XB = 1/0)
NOISE REDUCTOR : NOT DISPLAYED IN FUNCTION MENU
NOISE REDUCTOR : DISPLAYED IN FUNCTION MENU
SHARPNESS : NOT DISPLAYED IN FUNCTION MENU
SHARPNESS : DISPLAYED IN FUNCTION MENU
VX FUNCTION : NOT AVAILABLE (TDA847X ADD 16HEX)
VX FUNCTION : AVAILABLE

PICTURE STANDARD (TABLE 4)

CH.NUMBER IS DISPLAY I AV-1, AV-2 MODE
CH. NUMBER IS NOT DISPLAY IN AV-1, AV-2 MODE

­AUTO ON

MUTE OR POLAND SAFETY (TABLE 1)

4-2-4 Option Byte Table

REMARKS

SCART JACK

RCA JACK

BYTE 0

LANGUAGE (TABLE 1)

ZOOM (TABLE 2)

SYSTEM (TABLE 3)

STEREO
MONO
NON HYPER TUNER
HYPER TUNER

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

D7

D6

D5

D4

D3

D2

D1

D0

BIT

1. IDENT

SAA7283

TDA9840
TDA9859

YES

NO

2.SYMBOL
DISPLAY

YES
YES

3. S-MODE
CONTROL

YES
YES

1. IDENT
SAA7283
TDA9840
TDA9859

YES

NO

2. SYMBOL
DISPLAY

YES

NO

3. S-MODE
CONTROL

YES

NO

MODE

ITEM

LOGIC

LOW
HIGH

RF

AV-1, AV-2

BYTE 0 BIT D1 :