SAMSUNG CS29A6MTRXBWT Service Manual

COLOR TELEVISION RECEIVER

Chassis : SCT55A Model: CS29A6MTRX/BWT

COLOR TELEVISION RECEIVER C O N T E N T S

Precautions

Reference Information

Specifications

Disassembly and Reassembly

Alignment and Adjustment s

T roubleshooting

Exploded View and Parts List

Electric Parts List

Block Diagrams

10.

PCB Layout

11.

Wiring Diagram

12.

Schematic Diagrams

ELECTRONICS

Samsung Electronics Co., Ltd. JUN. 1999

Printed in Korea

3SCT55A-2901

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

Reference Information

Samsung Electronics 2-3

2-1 Tables of Abbreviations and Acronyms

100 Series .................................................................................................................................................... IF processing

200 Series ..............................................................................................................................Video, Chroma Processing

300 Series ........................................................................................................................................... Vertical Deflection

400 Series ...................................................................................................................................... Horizontal deflection

500 Series ..................................................................................................................................... CRT Drive Processing

600 Series ............................................................................................................................................ Sound Processing

700 Series ............................................................................................................................. A/V Switching Processing

800 Series ................................................................................................................................. AC Input Power Supply

900 Series ............................................................................................................................................... MICOM Section

RT, CT, ICT ....................................................................................................................................... TELETEXT Section

RC, CC, HC, SWY ............................................................................................................. SNAP-IN Section (Control)

RV,CV,LV,QV ............................................................................................................................................... V/M Section

RJ,CJ,LJ,DJ,ICJ ....................................................................................................................................... NICAM Section

RP,CP,LP,XP,ICP ............................................................................................................................................ PIP Section

RC,CC,DZC,QC ........................................................................................................................... COMB Filter Section

RP,PD .......................................................................................................................................... POWER-S/W Section

2-2 IC Line Up

Table 2 - 1 IC Line - Up

Reference Information

2-4 Samsung Electronics

Loc No. IC201 IC203 IC205 IC206 IC207 IC208 IC301 IC401 IC501 IC502 IC503 IC504 IC505 IC6001 IC6002 IC6003 IC6004 IC601 IC701 IC801 IC802 IC901 IC902 IC903 IC904

Specification TDA8375 TDA9177 TEA5114A TEA5114A TEA5114A TDA9170 LA7845 MC4558C TDA6101Q TDA6101Q TDA6101Q MC4558C SPK101T TDA9875/9870 TDA9808 TDA7050 MC4558C TDA7297 CXA1855S STR-S6709 LTV817B Z89313(Z90341) KIA7042P PQ09RF1 KA7808

Remarks

N3 VERSION

SCART OPTION TTX/OSD PIP/TTX

POWER POWER CRT CRT CRT CRT CRT AUDIO MODULE AUDIO MODULE AUDIO MODULE AUDIO MODULE

POWER POWER

Description ONE CHIP TV PROCESSOR LINE TRANSIENT IMPROVEMENT IC (LTI BOOSTER) R/G/B SWITCHING IC R/G/B SWITCHING IC R/G/B SWITCHING IC YUV PICTURE IMPROVEMENT PROCESSOR VERTICAL AMP OP AMPLIFIER (EW AMPLIFIER) VIDEO OUTPUT AMPLIFIER VIDEO OUTPUT AMPLIFIER VIDEO OUTPUT AMPLIFIER OP AMPLIFIER (TILT AMPLIFIER) SPOT KILLER HYBRID IC DIGITAL TV SOUND PROCESSOR VIF/SIF PROCESSOR (SIF PROCESSOR) 2-CHANNEL HEADPHONE AMPLIFIER OP AMPLIFIER (AUDIO AMPLIFIER) SOUND AMP AUDIO/VIDEO SWITCHING IC SMPS CONTROL IC PHOTO COUPLER MICRO PROCESSOR RESET IC 9V SWITCHABLE REGULATOR 8V REGULATOR

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

Reference Information

Samsung Electronics 2-5

Option : OSD Language

Table 2 - 1 IC Line - Up (Continued) Loc No. IC905 IC906 IC907 IC908 IC909 IC910 ICP03 ICP05 ICP06 IC101 IC202 IC203 ICT01 ICP02 ICP01 ICP04 ICP07 ICP08

Specification KA7812A KA7805A KA7808 24C08 KA7805A KA7805A TDA9160A SAB9077H 548262 PAP102 TDA4665 TDA8395P SAA528IP/E TDA9808 PAP101 TDA3504 KIA7042P TDA4665T

Remarks

PIP MODULE PIP MODULE PIP MODULE

SECAM MODULE SECAM MODULE

PIP MODULE PIP MODULE PIP MODULE PIP MODULE PIP MODULE

Description 12V REGULATOR 5V REGULATOR 8V REGULATOR E2PROM 5V REGULATOR 5V REGULATOR PAL/NTSC/SECAM DECODER AND SYNC PROCESSOR PIP CONTROLLER MEMORY-2M IF PRE-AMP HYBRID IC BASE BAND DELAY LINE SECAM DECODER TELETEXT VIF/SIF-DETECTOR IF PRE-AMP HYBRID IC RGB-MATRIX RESET IC BASE BAND DELAY LINE

No.

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Description ENG/ARAB/FRENCH/CHINESE/ MALAYSIA/INDONESIA/VIETNAM/ THAI/RUSSIAN/CROATIA/BULGARIA/ POLAND/ROMANIA/CZECH/TURKEY/HUNGARY

Remarks 2-TUNER MULTI-PIP MULTI-LANGUAGE

Specification

SZM-162M

Loc No.

IC901

Table 2-2

Specifications

Samsung Electronics 3-1

3. Specifications

Model

TUNING

SYSTEM COLOUR

SOUND

NICAM ANTENNA IMPEDANCE SCREEN SIZE POWER REQUIREMENTS

FREQUENCY PROGRAMME CHANNEL

761A/3001A

Frequency Synthesizer

PAL, SECAM, NTSC3.58, NTSC4.43

B/G, D/K, I,M

B/G,I

75 ohm unbalanced coaxial

70.8 cm

Main voltage : 220V/230V/240V~

Range : 100 - 260V~

50/60Hz

100 channels

Specifications are subject to change.

Disassembly and Reassembly

Samsung Electronics 4-1

4. Disassembly and Reassembly

4-1 Cabinet

1. Remove 9 screws located on the side of the cabinet.

2. Pull the Main Assembly backwards to remove.

3. To reassemble, place the receiver on a flat surface and repeat the sequence in reverse order.

4. To check that that the Chassis Assembly is installed correctly, attempt to pull if from the front cabinet.

Fig. 4-1

4-2 Speaker

1. Separate Connectors (a), (b).

2. Separate wires from twist-lock.

3. Remove 2 screws, (c).

4. To reassemble, repeat the sequence in reverse order.

Disassembly and Reassembly

4-2 Samsung Electronics

Fig. 4-2

4-3 Chassis Assembly

4-3-1 Removal from Front Cabinet

1. Lift and pull back the chassis mounting.

Disassembly and Reassembly

Samsung Electronics 4-3

Fig. 4-3

Fig. 4-4

Disassembly and Reassembly

4-4 Samsung Electronics

4-3-2 Terminal Board

Removal

1. Pull the power cord to the left and remove it.

2. Remove 1 screw ( a).

3. lift up the 2 brackets( b). Separate the terminal board from the chassis mount.

4. To reassemble, refer to Fig. 4-6.

BRACKET

TERMINAL-BOARD

HOLDER-CHASSIS

WIRELESS H/P-JACK

S-VHS JACK

Fig. 4-6

Fig. 4-5

Insert

" " Insert on the left and right bottom of the terminal board, into " " hole on the holder chassis.

Disassembly and Reassembly

Samsung Electronics 4-5

4-3-3 PCB

Removal

1. Refer to the Fig. 4-4.

2. Remove the wire (1P) from the chassis mounting.

3. Pull the PCB guides backwards.

4. Lift both edges of the PCB and pull out.

Disassembly

1. Ensure that the PCB is well positioned in the PCB guides.

2. The power cord must not touch the heat-sink, D73.

3. The PCB guide is part of the chassis mounting ; if a new PCB guide is needed, the complete chassis mounting must be replaced.

4-3-4 SNAPIN Removal

SNAPIN-CONTROL

Fig. 4-7 Press the SNAPIN (b) with thumb ; pull the left holder-bracket (a) with index finger

Disassembly and Reassembly

4-6 Samsung Electronics

4-3-5 Chassis Reassembly

1. Close the SNAPIN door.

2. Place the chassis bracket (b) onto (a) on the bottom of the cabinet.

3. Push the bracket into the hole (a) until a ÒclickÓ is heard.

4. Check that the SNAPIN door opens and closes.

HOLDER-CHASSIS

F/CABINET

Fig. 4-8

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 no 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 +130 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.

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