SAMSUNG CK331FVR5X Service Manual

COLOR TELEVISION RECEIVER

Chassis : S15A Model: CK331FVR5X/NWT CK331FVR5X/BWT

CK331FVR5X/VWT CK501FVR5S/NWT

COLOR TELEVISION RECEIVER CONTENTS

Precautions

Specifications and IC Data

Disassembly and Reassembly

Alignment and Adjustment

Troubleshooting

Exploded View and Parts List

Electric Parts List

Block Diagram

PCB Layout Diagram

Wiring Diagram

Schematic Diagrams

10.

11.

ELECTRONICS

Samsung Electronics Co., Ltd. FEB.1999

Printed in Korea

3S15A-3121

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 people—particularly children—might 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 unit’s 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 unit’s 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

“horizontal disable” or “hold-down”.)

Heed the high voltage limits. These include the X–ray 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 manufacturer’s 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 “integral implosion” 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 “in-line” picture tubes are equipped with a permanently attached deflection yoke; do not try to remove such “permanently attached” 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 original—even 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 unit’s 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 instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s 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 (“solid state”) 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 power— 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 “anti-static”; 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

Television System:

Channels:

Intermediate Frequencies (MHz) :

Picture Tube:

Power Requirements: Antenna Input Impedance: Speaker Impedance

NTSC - M

2 - 13 14-69

NTSC - M

38.90

34.40

35.32

PAL/SECAM-

B/G,I

2 - 12

21 - 69

PAL/ SECAM- B/G

38.90

33.40

34.47

System

Band

VHF

UHF

SYSTEM

IF Carrier Frequency

Picture IF Carrier

Sound IF Carrier

Color Sub Carrier

PAL, SECAM- D/K

1 - 13

21 - 69

PAL/SECAM-D/K, SECAM-K1

38.90

32.40

34.47

SECAM-K1, PAL-D

2 - 9

13 - 57

PAL - I

38.90

32.90

34.47

MODEL

CI CII CX CK

14 Inch 20 Inch 21 Inch

AC 100~260V, 50/60Hz VHF, UHF : Telescopic dipole antenna (75 ohm unbalanced type )

8 ohm, 5W+5W (Dual Type) 16 ohm, 3W (Monitor Type & Dual Type)

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, SECAM-B/G, D/K, NT4.43, NT3.58

A34KQV42X A48KRD82X(H) A51KQJ63X

Quick start, in-line-gun,

Black stripe, 90

degree deflection

2-2 IC Line Up

Specifications and IC Data

2-2 Samsung Electronics

Loc. No Specification Description Remark

HC101 PAP103 IF PRE-AMP

IC201 TDA8842 PAL/SECAM-B/G, D/K, NTSC

Philips

TDA8841 PAL-B/G, D/K, NTSC

IC301 TDA8356 VERTICAL OUTPUT

IC501 TDA6107Q RGB DRIVE AMP

IC601 TDA7056B SOUND-AMP (3W x 1CH or 3W x 2CH)

IC602 TDA7057AQ SOUND-AMP (5W x 2CH)

IC801 KA3S0680RF POWER IC (STR)

IC802 KA7630 CUSTOM REGULATOR (5V, 8V)

Table 2-1 IC Line-Up

SZM173EA W/O TTX, English/French/Arabian

SZM173EC W/O TTX, English/Chinese

SZM173ET W/O TTX, English/Thai SZM173EW W/O TTX, English/German/French/Dutch/Italian/Spanish,

Swedish/Yugo/Greek/Croatian SZM173EE W/O TTX,English/Romanian/Hungarian/Polish/Czech/Bulgarian

SZM173ER W/O TTX, English/Russian

SPM175EE TTX, West : English/German/French/Dutch/Italian/Spanish/Swedish East : English/Czech/Croatian/Romanian/Hungarian/Polish

SZM173EV W/O TTX, English/Vietnamese/Indonesian/Malay

IC902 24C04/KS24C040 EEPROM

PC801 TCET1108 / LTV817B PHOTO COUPLER

SPM175ER TTX, English/Russian/Bulgarian

SPM175EP TTX, English/Iranian

SPM175EA TTX, English/French/Arabian

SPM175EG TTX, English/Greek/Yugo

Dual Type

Zilog (Non TTX)

Philips (TTX)

IC901

SZM173AR W/O TTX, English/Arabian

SPM175E TTX, English/French/Swiss

2-3 Semiconductor Base Diagrams

Specifications and IC Data

Samsung Electronics 2-3

ELECTROLYTICCONDENSER

DIODE

TDA884X(Pin 56) Z8933112PSC(Pin 42) X24CO4P(Pin 8) SAA5291(Pin 52) TDA9859(Pin 32) KS24C040(Pin 8)

TRANSISTOR

TDA8133 TDA8356 TDA6101Q KA7630

TRANSISTOR

2SD1651 2SD1650 KSD5072 KSD5071 KSD1711 KSC5386

E B C

KSC815-Y KSA539-Y BC548 KTC9014

UPC574J

KA33V

SAW-FILTER

E C B

KSR1012 KSR1010 KSR2010 KTD863-Y

K2971M K7252M

Fig. 2-1 Semiconductor Base Diagrams

2-4 Samsung Electronics

MEMO

Disassembly and reassembly

Samsung Electronics 3-1

3. Disassembly and Reassembly

3-1 Back Cover Removal

1. After removing the screws, press the tension rib and pull the cabinet backwards.

2. To reassemble, press the tension rib (see diagram).

3-2 Main Board Removal

Disassembly and reassembly

3-2 Samsung Electronics

1. Separate the socket board from the CRT neck.

2. Remove the Anode Cap from the CRT.

3. Remove the main board by pulling it with both hands.

Warning: The FBT is charged with high voltage. Before removing the Anode Cap, discharge the voltage through one of the heat sinks on the main board.

3-3 Speaker Removal

Disassembly and reassembly

Samsung Electronics 3-3

1. Remove the speaker by pressing the tension rib.

1. Remove the screws.

2. Remove the speaker by pressing the tension rib.

+ 29 hidden pages