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COLOR TELEVISION RECEIVER
Chassis : K15A
Model: TXJ1366
TXJ1367
TXJ1396
TXJ1966
TXJ1996
COLOR TELEVISION RECEIVER CONTENTS
1. Precautions
2. Specifications
3. Disassembly and Reassembly
4. Alignment and Adjustments
5. Troubleshooting
6. Exploded Views and Parts List
7. Electric Parts List
8. Block Diagram
9. PCB Layout
10. Wiring Diagrams
11. Schematic Diagrams
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Precautions 1. Precautions 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 1. Be sure that all of the built-in protective devices are replaced. Restore any missing (READING SHOULD NOT BE ABOVE LEAKAGE protective shields. DEVICE 0.5mA) CURRENT UNDER TESTER TEST 2. When reinstalling the chassis and its TEST ALL EXPOSED METAL assemblies, be sure to restore all protective SURFACES
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Precautions 1-1 Safety Precautions (Continued) 9. High voltage is maintained within specified 15. Observe the original lead dress, especially limits by close-tolerance, safety-related near the following areas: Antenna wiring, components and adjustments. If the high sharp edges, and especially the AC and high voltage exceeds the specified limits, check voltage power supplies. Always inspect for each of the special components. pinched, out-of-place, or frayed wiring. Do not change the spa
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Precautions 1-2 Servicing Precautions 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. Servicing precautions are printed on the 5. Check the insulation between the blades of the cabinet. Follow them. AC plug and accessible conductive parts (example
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Precautions 1-3 Precautions for Electrostatically Sensitive Devices (ESDs) 1. Some semiconductor (Òsolid stateÓ) devices 5. Use only a grounded-tip soldering iron when are easily damaged by static electricity. Such soldering or unsoldering ESDs. components are called Electrostatically Sensitive Devices (ESDs); examples include 6. Use only an anti-static solder removal device. integrated circuits and some field-effect Many solder removal devices are not rated as transistors. The following techn
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ELECTRONICS © Samsung Electronics Co., Ltd. SEP. 1999 Printed in Korea 3K15A-1425
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Specifications 2. Specifications 2-1 Specifications Television System 14"/20"/21" NTSC COLOR TV SIGNAL Power Consumption 14" : 57 WATTS NOMINAL, 20" : 70 WATTS NOMINAL 21" : 75 WATTS NOMINAL, Picture Tube 14" : A34KQV42X 20" : A48KRD82X (H) 21": : A51KQJ63X (H) Power Requirement AC 120V, 60Hz /AC 100 ~ 240, 50Hz, 60Hz Operating System REMOCON SYSTEM (SZM354ET) Tuning Ranges VHF CH : 2-13, UHF CH : 14-69, CABLE CH : 1,14-125 Antenna Input Impedance 75 ohm UNBALANCED TYPE FOR VHF/UHF
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Disassembly and Reassembly 3. Disassembly and Reassembly 3-1 Back Cover Removeal Fig. 3-1 1. After removing the screws, pull the cabinet backwards. Samsung Electronics 3-1
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Disassembly and Reassembly 3-2 Main Board Removal Fig. 3-3 Fig. 3-2 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. 3-2 Samsung Electronics
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Disassembly and Reassembly 3-3 Speaker Removal 1. Loosen the screws and remove the speakers. Fig. 3-4 Samsung Electronics 3-3
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Disassembly and Reassembly 3-4 CRT Removel Fig. 3-5 1. Spread a soft mat on the floor. Place the TV set face down. 2. Remove the 4 nuts mounting the CRT to the front cabinet. 3. Lift the CRT. 4. Caution: Because of the high vacuum and large surface area of the picture tube, be careful while handling it: (1) Always lift the picture tube by grasping it firmly around the face- plate, (2) Never lift the tube by its neck. (3) Do not scratch the picture tube or apply excessive pressure. Fractures
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Alignment and Adjustments 4. Alignment and Adjustments 4-1 Service Mode Adjustments 4-1-1 Service Mode Menus Since there are no VRs in the K15A chassis, all adjustments after parts replacement must be done in the Service Mode. Service Mode adjustments are necessary when either the EEPROM (IC902) or the CRT is replaced. 4-1-2 Entering the Service Mode Press the following transmitter keys while in STAND-BY mode: MUTE—>1—>8—>2—>POWER “Factory Mode Menu” is displayed Change the data with “Volume
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Alignment and Adjustments 4-1-3 Adjustment in Option Mode 4-1-4 Service Mode Adjustments This adjustment is necessary whenever the EEPROM is replaced. Input data (as marked ADJUSTMENT on the back cabinet). PATTERN OPTION ADJUSTMENT RESET PATTERN OPTION RESET 1. The Pattern Adjustment is done only in the factory. Do not attempt to readjust it. Select “SET OPTION” by pressing the Channel key twice. t 2. Refer to 4-2 for other adjustments. ADJUSTMENT 3. Set OPTION data. PATTERN OPTION RE
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Alignment and Adjustments 4-2 Alignment and Adjustment 4-2-1 General Alignment Instructions 4-2-5 IC902 Replacement 1. Usually, a color TV needs only slight 1. When IC902 is replaced, all values are reset to touch-up adjustment upon installation. Check “Initialized MICOM Data” and readjustment the basic characteristics such as picture height, is necessary. focus and a horizontal and vertical sync. 2. Press the POWER button 10 seconds after 2. Observe the picture and check for good back plug
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Alignment and Adjustments 4-2-8 Sub-Contrast Adjustment 4-2-10 Sub-Color Adjustment 1. Input a gray scale pattern. Use a pattern 1. Do sub-color adjustment after the Sub- generator (PM5518). Contrast and Sub-Tint adjustments. 2. Short D208 to switch off the ABL feed-back. 2. D208 should still be shorted. The ABL should still be switched OFF. 3. Check CN201 R-OUT with an oscilloscope. 3. Input a color bar pattern. Use a pattern gen- 4. Set RC, BC, GC data to 0 in the Service Mode. erator (PM
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Alignment and Adjustments 4-2-11 White Balance Adjustment 4-2-13 Vertical Size Adjustment 1. Input a lion head pattern. 4-2-11 (A) LOW-LIGHT ADJUSTMENTS 2. After the vertical center adjustment, enter into the service mode. 1. Input either a lion head or “pure white” color pattern. 3. Adjust VA so that the each top and bottom of the screen is 4.0. If the top and bottom values 2. Operate the receiver for 30 minutes. are different, adjust VA so that the sum of the two values is 8.0. 3. Check the
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MEMO 4-6 Samsung Electronics
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Troubleshooting 5. Troubleshooting 5-1 No Power No Power ON OFF Check LED when AC Check IC802. code is plugged. Abnormal Normal Abnormal Check Check/Replace Fuse. IC802, R812, D856. Check Check and Replace IC801* Pin 1 D807 ~D810 Oscillation. Abnormal Check Abnormal (0 ~ 15V) + IC801 Pin 3 B . Check/Replace Normal (15~20V) D806, Q401, Q801, D802, D814* Normal (0.5 ~ 3V) Abnormal (0V) Check IC801* Pin 4 Voltage Check/Replace Check/Replace DZ802, DZ803, D806 PC802, DZ807 Samsung Electronics
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Troubleshooting 5-2 No Sound No Sound Check Normal Abnormal Connector CN601 and CN701. Check Abnormal Normal Check CN601 and CN701 Waveform of Connector IC601 Pin 1. Soldering and A/V PCB. Check Check Normal Abnormal Normal Waveform of IC201 Waveform of IC601 and Ok Pin 52. IC602 Pins 4. Abnormal Check Normal Waveform of IC201 Check Pin 1. Normal (approx. 12V) Voltage of IC601 and IC602 Pin 5. Abnormal Abnormal Check O.K Volume SIF (L201). Up. Replace IC601 Check Power and IC602. 12V Line V
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Troubleshooting 5-3 Horizontal Line Appears Single Horizontal Line Check Abnormal Normal (24V) 24V-C Voltage. Check Check Abnormal NG FBT Pin 2 (24V) Waveform of IC201 Oscillation. Pins 22,24. Normal Check Whether O.K a horizontal line appears in Normal Check R409 Check/Replace the service mode.. Open. FBT. Open NG Check/Replace Check/Replace Check/Replace R409. IC201. IC301. Samsung Electronics 5-3
