SAMSUNG DIGITAL TELEVISION RECEIVER SERVICE MANUAL

This Service Manual is a property of Samsung Electronics Co.,Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

© Samsung Electronics Co., Ltd. Aug. 2004. Printed in Korea. AA82-01979A

Contents

1. Specifications
2. Alignment and Adjustments
3. Exploded Views and Parts List
4. Electrical Parts List
5. PCB Diagrams
6. Schematic Diagrams

1. Specifications

2. Alignment and Adjustments

2-1 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.

2-2 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.

2-3 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 30 KV under any conditions.

2-4 FOCUS Adjustment

1. Input a black and white signal.
2. Adjust the tuning control for the clearest picture.
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.

2-5 Factory Adjustment

2-5-1 Service Mode

To enter the "Service Mode", press the remote-control keys in this sequence:

If you do not have Factory remote-control: PICTURE OFF ➔ DISPLAY (➕) ➔ MENU ➔ MUTE ➔ PICTURE ON

If you have Factory remote-control: PICTURE ON ➔ DISPLAY (➕) ➔ FACTORY

2-5-2 Factoy Mode OSD

2-5-2(A) ADJUST

OSD Menu for TDA959X adjustment:

Detailed OSD parameter descriptions:

NOTE: PVS, PVA, PHS parameters must be aligned using the 50Hz vertical-field rates.

2-5-2(B) OPTION

In the Service Mode, various options can be selected via the Option Table. Example:

2-5-2(C) G2-ADJUST

Entering G2-Adjust Mode Screen Adjust: Displayed As "NG". ➔ Turn SCREEN VR OF FBT, Adjust Value Becomes "OK".

Screen Adjust: N.G ⇩ Screen Adjust: O.K ⇧ Screen Adjust: N.G

2-5-2(D) SCREEN CHANGE (I2C BUS GEOMETRIC ADJUSTMENT)

This section illustrates screen changes during I2C bus geometric adjustment. Visual representations of V Shift, V Amp, V Slope, V SC, and H Shift adjustments are typically shown as rectangular screen areas changing shape or position. For example, V Shift would show the screen moving up or down, V Amp would show vertical expansion or compression, V Slope would show trapezoidal distortion, V SC would show S-correction, and H Shift would show horizontal movement.

2-6 PIN ASSIGNMENT SPECIFICATION

This section details the pin assignments for various components, including their symbols, functions, and check voltages (S-By and P-On). The full list of pin assignments can be found on the Samsung Electronics ITSELF website: http://itself.sec.samsung.co.kr.

2-7 Main Adjustment Parameter (TDA 93XX)

This section provides a comprehensive list of main adjustment parameters for the TDA93XX (IC201S) chip, including OSD function, range, initial data, and remarks. The full list of parameters can be found on the Samsung Electronics ITSELF website: http://itself.sec.samsung.co.kr.

NOTE: PVS, PVA, PHS parameters must be aligned using the 50Hz vertical-field rates.

2-8 Option Bytes (TDA 93XX)

In the Service Mode, various options can be selected via the Option Table. Example:

TDA93XX/TDA959X PIN Difference:

3. Exploded View & Parts List

This section provides exploded views and corresponding parts lists for the Samsung Digital Television Receiver models CS21S8ML6X/XSE and CS21M20ML6XXTT. These diagrams illustrate the assembly of the television, showing individual components and their relative positions. The accompanying tables list each part with its code number, description, specification, and quantity. For the most updated part codes, refer to the Samsung Electronics ITSELF website: http://itself.sec.samsung.co.kr.

4. Electrical Parts List

This section contains detailed electrical parts lists for the Samsung Digital Television Receiver models CS21M20ML6XXTT and CS21S8ML6X/XSE. The lists are organized by assembly (e.g., Cover Front, Chassis, Cover Rear, CPT, Fixing, P/Material, Accessory) and include information such as level, location number, code number, description, and specification for each electrical component. For the most updated part codes, refer to the Samsung Electronics ITSELF website: http://itself.sec.samsung.co.kr.

5. PCB Diagrams

This section presents the Printed Circuit Board (PCB) diagrams for the main board of the Samsung Digital Television Receiver. These diagrams provide a visual representation of the component layout on the PCB, aiding in identification and troubleshooting. The diagrams are for internal service use and should not be used without Samsung's authorization.

6. Schematic Diagrams

This section contains detailed schematic diagrams for various main circuits and blocks of the Samsung Digital Television Receiver, including: Main 1 (Power & V/H-Deflection), Main 2 (UOC), Main 3 (A/V & Sound Process), Main 4 (CRT), Main 5 (TDA93xx + MSP34xx Model), Main 6 (TDA95xx + MSP34xx Model), Main 7 (Mono-Quasi Split Model), Main 8 (Mono Inter-Carrier Model), VIF Block, and Audio Switching, System Switching, SIF Block. These diagrams illustrate the electrical connections and functional relationships between components, essential for service and repair. These documents are for internal service use and should not be used without Samsung's authorization.

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