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  1. 138 downloads

    LCD TV SERVICE MANUAL CHASSIS : LD01B MODEL : 42LD420/420N 42LD420/420N-ZA MODEL : 42LD428/420C 42LD428/420C-ZA BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
  2. File Name: LG 42LD420 service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: LG LCD TV SERVICE MANUAL CHASSIS : LD01B MODEL : 42LD420/420N 42LD420/420N-ZA MODEL : 42LD428/420C 42LD428/420C-ZA BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
  3. 25 downloads

    Daewoo service manual CHASSIS : CP-830F MODEL : DTH-29U7 DTH-29U8 DTH-2881 DTH-28W8 DTH-28W9 CONTENTS DOCUMENT HISTORY 5 1 MAIN FEATURES 5 1.1 SPECIFICATIONS 5 1.1.1 GENERAL 5 1.1.2 EURO-SCART 1 (21 Pin) 5 1.1.3 EURO-SCART 2 (21 Pin) 6 1.2 CHANNEL/FREQUENCY TABLE 7 1.3 ATSS SORTING METHOD 10 1.3.1 GENERAL CASE 10 1.3.2 SPECIAL CASE 10 2 SAFETY INSTRUCTION 12 3 ALIGNMENT INSTRUCTIONS 13 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE 13 3.2 SERVICE MODE NAVIGATION 13 3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS 13 3.3.1 OPTION 1 14 3.3.2 OPTION 2 14 3.4 TV SET ALIGNMENT 14 3.4.1 LOCAL OSCILLATOR ALIGNMENT 14 3.4.2 G2 ALIGNMENT 14 3.4.3 WHITE BALANCE 15 3.4.4 FOCUS 15 3.4.5 VERTICAL GEOMETRY 15 3.4.6 HORIZONTAL PICTURE CENTRING 15 3.4.7 EAST / WEST CORRECTION 15 3.4.8 AGC 16 4 IC DESCRIPTION 17 4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER 17 4.1.1 BLOCK DIAGRAM OF THE SDA55XX 17 4.1.2 DESCRIPTION 17 4.1.3 IC MARKING AND VERSION 18 4.1.4 PINNING 18 4.2 VSP9412A - SCAN RATE CONVERTER INCLUDING MULTISTANDARD COLOUR DECODER 19 4.2.1 BLOCK DIAGRAM OF THE VSP9412A 20 4.2.2 DESCRIPTION 20 4.2.3 PINNING 22 4.3 DDP 3315C - DISPLAY AND DEFLECTION PROCESSOR 23 4.3.1 BLOCK DIAGRAM OF THE DDP 3315C 24 4.3.2 DESCRIPTION 24 4.3.3 PINNING 26 4.4 MSP341X MULTISTANDARD SOUND PROCESSOR 28 4.4.1 BASIC FEATURES OF THE MSP 341X 28 4.4.1.1 Demodulator & NICAM Decoder Section 28 4.4.1.2 DSP-Section (Audio Baseband Processing) 29 CP830F Service Manual -2- 4.4.1.3 Analogue Section 29 4.4.1.4 NICAM & FM/AM-Mono 29 4.4.1.5 German 2-Carrier System (DUAL FM System) 29 4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 32 4.5.1 DESCRIPTION 32 4.5.2 FEATURES 32 4.5.3 PINNING 32 4.5.4 BLOCK DIAGRAM 33 4.6 TDA894XJ STEREO AUDIO AMPLIFIER 34 4.6.1 FEATURES 34 4.7 TDA835XJ VERTICAL AMPLIFIER 35 4.7.1 TDA8357J 35 4.7.2 TDA8358J 37 4.8 TDA6107Q 39 4.9 24C16 - 16 KB EEPROM 40 4.10 STR - F6654 41 4.10.1 GENERAL DESCRIPTION 41 4.10.2 FEATURES 41 4.10.3 BLOCK DIAGRAM 41 4.10.4 PIN DESCRIPTION 42 4.10.5 CONTROL PART - ELECTRICAL CHARACTERISTICS 42 4.10.6 MOSFET ELECTRICAL CHARACTERISTICS 43 5 CP830 CHASSIS DESCRIPTION 44 5.1 BLOCK DIAGRAM 44 5.2 IF SECTION 45 5.2.1 BLOCK DIAGRAM 45 5.2.2 VISION IF AMPLIFIER 46 5.2.3 TUNER-AND VIF-AGC 46 5.2.4 FPLL, VCO AND AFC 46 5.2.5 VIDEO DEMODULATION AND AMPLIFIER 47 5.2.6 SOUND IF AMPLIFIER AND SIF-AGC 47 5.2.7 QUASI-PARALLEL-SOUND (QPS) MIXER 47 5.2.8 STANDARD SWITCH 47 5.2.9 L SWITCH 47 5.2.10 INTERNAL VOLTAGE STABILISER 47 5.3 VIDEO / RGB 51 5.3.1 FRONT END 47 5.3.1.1 CVBS Front-End 47 5.3.1.2 Input Selector 48 5.3.1.3 Signal Levels And Gain Control 48 5.3.1.4 Synchronization 48 5.3.1.5 Chroma Decoder 48 5.3.1.6 Luminance Processing 48 5.3.1.7 RGB Front-End 48 5.3.1.8 Signal Processing 48 5.3.1.8.1 Horizontal Prescaler 48 5.3.1.8.2 Noise Reduction 49 5.3.1.8.3 Noise Measurement 49 5.3.1.8.4 Operation Modes 49 CP830F Service Manual -3- 5.3.1.8.5 Digital 656 Output 49 5.3.2BACK END 49 5.3.2.1 Digital Input Interface 49 5.3.2.2 Horizontal Scaler 49 5.3.2.3 Luma Contrast and Brightness 49 5.3.2.4 Black Level Expander/Compressor (BLEC) 49 5.3.2.5 Luma Sharpness Enhancer (LSE) 50 5.3.2.6 Dynamic Peaking 50 5.3.2.7 Luma Transient Improvement (LTI) 50 5.3.2.8 Mixing of Dynamic Peaking and LTI 50 5.3.2.9 Chroma Transient Improvement 50 5.3.2.10 Analog Back End 51 5.3.2.11 Analog RGB Insertion 51 5.3.2.12 CRT Measurement and Control 51 5.3.2.13 Synchronization and Deflection 52 5.3.2.14 EHT Compensation 52 5.4 MICROCONTROLLER 52 5.4.1MICROCONTROLLER FEATURES 52 5.4.2 ACQUISITION FEATURES 53 5.4.3PORTS 53 5.4.4 -CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE 53 5.4.5TUNING 54 5.4.6AUTOMATIC PICTURE FORMAT SWITCHING 54 5.4.6.1 WSS Data 54 5.4.6.2 SCART Pin 8 Data (Slow Switching) 55 5.4.6.3 Picture Format Description 55 5.4.6.3.1 16:9 CRT 55 5.4.6.3.2 4:3 CRT 56 5.4.7EXTERNAL SOURCE CONTROL LOGIC 57 5.4.8OVER CURRENT PROTECTION 58 5.5 TELETEXT DISPLAY 58 5.6 SOUND PROCESSING 59 5.6.1 ANALOGUE SOUND IF - INPUT SECTION 59 5.6.2QUADRATURE MIXERS 59 5.6.3PHASE AND AM DISCRIMINATION 59 5.6.4NICAM DECODER 60 5.6.5DSP SECTION 60 5.6.6SOUND MODE SWITCHING 60 5.7 SOUND AMPLIFICATION 60 5.7.1POWER AMPLIFIER 60 5.7.2MODE SELECTION 60 5.8 VERTICAL DEFLECTION 61 5.8.1 FLYBACK VOLTAGE 61 5.8.2PROTECTION 61 5.8.3GUARD CIRCUIT 61 5.8.4DAMPING RESISTOR 61 5.8.5EAST-WEST AMPLIFIER (TDA8358J ONLY) 61 5.9 POWER SUPPLY (STR F6654) 61 5.9.1STR-F6654 GENERAL DESCRIPTION 61 CP830F Service Manual -4- 5.9.2POWER SUPPLY PRIMARY PART OPERATIONS 61 5.9.2.1 Start -up Circuit: VIN 62 5.9.2.2 STR-F6654 Oscillating Operation 63 5.9.2.3 STR-F6654 Protection Circuits 64 5.10 TV START-UP, TV NORMAL RUN AND STAND BY MODE OPERATIONS 65 5.10.1 TV START-UP OPERATIONS 65 5.10.1.1 Schematic Diagram For Start-Up Operations 65 5.10.1.2 TV Start-Up And Microcontroller Initialisation 65 5.10.2 TV NORMAL RUN AND STAND-BY MODE OPERATIONS 67 5.10.2.1 TV On Normal Run Mode 67 5.10.2.2 TV Set On Stand-By Mode 70 6 SERVICE PARTS LIST 72 6.1 DTH-29U7ZL 72 6.2 DTG-2881ZL 80 7 EXPLODED VIEW 88 7.1 DTH-29U7 88 7.2 DTH-29U8 89 7.3 DTH-2881 90 7.4 DTH-28W8 91 7.5 DTG-28W9 92 8 PRINTED CIRCULT BOARD 93 8.1 MAIN PCB 93 8.2 CRT PCB 94 8.3 PFC PCB 95 9 SCHEMATIC DIAGRAM 96
  4. File Name: Daewoo CP-830F DTH-29G2_100 service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: Daewoo Daewoo service manual CHASSIS : CP-830F MODEL : DTH-29U7 DTH-29U8 DTH-2881 DTH-28W8 DTH-28W9 CONTENTS DOCUMENT HISTORY 5 1 MAIN FEATURES 5 1.1 SPECIFICATIONS 5 1.1.1 GENERAL 5 1.1.2 EURO-SCART 1 (21 Pin) 5 1.1.3 EURO-SCART 2 (21 Pin) 6 1.2 CHANNEL/FREQUENCY TABLE 7 1.3 ATSS SORTING METHOD 10 1.3.1 GENERAL CASE 10 1.3.2 SPECIAL CASE 10 2 SAFETY INSTRUCTION 12 3 ALIGNMENT INSTRUCTIONS 13 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE 13 3.2 SERVICE MODE NAVIGATION 13 3.3 MICROCONTROLLER CONFIGURATION : OPTION BITS 13 3.3.1 OPTION 1 14 3.3.2 OPTION 2 14 3.4 TV SET ALIGNMENT 14 3.4.1 LOCAL OSCILLATOR ALIGNMENT 14 3.4.2 G2 ALIGNMENT 14 3.4.3 WHITE BALANCE 15 3.4.4 FOCUS 15 3.4.5 VERTICAL GEOMETRY 15 3.4.6 HORIZONTAL PICTURE CENTRING 15 3.4.7 EAST / WEST CORRECTION 15 3.4.8 AGC 16 4 IC DESCRIPTION 17 4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER 17 4.1.1 BLOCK DIAGRAM OF THE SDA55XX 17 4.1.2 DESCRIPTION 17 4.1.3 IC MARKING AND VERSION 18 4.1.4 PINNING 18 4.2 VSP9412A - SCAN RATE CONVERTER INCLUDING MULTISTANDARD COLOUR DECODER 19 4.2.1 BLOCK DIAGRAM OF THE VSP9412A 20 4.2.2 DESCRIPTION 20 4.2.3 PINNING 22 4.3 DDP 3315C - DISPLAY AND DEFLECTION PROCESSOR 23 4.3.1 BLOCK DIAGRAM OF THE DDP 3315C 24 4.3.2 DESCRIPTION 24 4.3.3 PINNING 26 4.4 MSP341X MULTISTANDARD SOUND PROCESSOR 28 4.4.1 BASIC FEATURES OF THE MSP 341X 28 4.4.1.1 Demodulator & NICAM Decoder Section 28 4.4.1.2 DSP-Section (Audio Baseband Processing) 29 CP830F Service Manual -2- 4.4.1.3 Analogue Section 29 4.4.1.4 NICAM & FM/AM-Mono 29 4.4.1.5 German 2-Carrier System (DUAL FM System) 29 4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 32 4.5.1 DESCRIPTION 32 4.5.2 FEATURES 32 4.5.3 PINNING 32 4.5.4 BLOCK DIAGRAM 33 4.6 TDA894XJ STEREO AUDIO AMPLIFIER 34 4.6.1 FEATURES 34 4.7 TDA835XJ VERTICAL AMPLIFIER 35 4.7.1 TDA8357J 35 4.7.2 TDA8358J 37 4.8 TDA6107Q 39 4.9 24C16 - 16 KB EEPROM 40 4.10 STR - F6654 41 4.10.1 GENERAL DESCRIPTION 41 4.10.2 FEATURES 41 4.10.3 BLOCK DIAGRAM 41 4.10.4 PIN DESCRIPTION 42 4.10.5 CONTROL PART - ELECTRICAL CHARACTERISTICS 42 4.10.6 MOSFET ELECTRICAL CHARACTERISTICS 43 5 CP830 CHASSIS DESCRIPTION 44 5.1 BLOCK DIAGRAM 44 5.2 IF SECTION 45 5.2.1 BLOCK DIAGRAM 45 5.2.2 VISION IF AMPLIFIER 46 5.2.3 TUNER-AND VIF-AGC 46 5.2.4 FPLL, VCO AND AFC 46 5.2.5 VIDEO DEMODULATION AND AMPLIFIER 47 5.2.6 SOUND IF AMPLIFIER AND SIF-AGC 47 5.2.7 QUASI-PARALLEL-SOUND (QPS) MIXER 47 5.2.8 STANDARD SWITCH 47 5.2.9 L SWITCH 47 5.2.10 INTERNAL VOLTAGE STABILISER 47 5.3 VIDEO / RGB 51 5.3.1 FRONT END 47 5.3.1.1 CVBS Front-End 47 5.3.1.2 Input Selector 48 5.3.1.3 Signal Levels And Gain Control 48 5.3.1.4 Synchronization 48 5.3.1.5 Chroma Decoder 48 5.3.1.6 Luminance Processing 48 5.3.1.7 RGB Front-End 48 5.3.1.8 Signal Processing 48 5.3.1.8.1 Horizontal Prescaler 48 5.3.1.8.2 Noise Reduction 49 5.3.1.8.3 Noise Measurement 49 5.3.1.8.4 Operation Modes 49 CP830F Service Manual -3- 5.3.1.8.5 Digital 656 Output 49 5.3.2BACK END 49 5.3.2.1 Digital Input Interface 49 5.3.2.2 Horizontal Scaler 49 5.3.2.3 Luma Contrast and Brightness 49 5.3.2.4 Black Level Expander/Compressor (BLEC) 49 5.3.2.5 Luma Sharpness Enhancer (LSE) 50 5.3.2.6 Dynamic Peaking 50 5.3.2.7 Luma Transient Improvement (LTI) 50 5.3.2.8 Mixing of Dynamic Peaking and LTI 50 5.3.2.9 Chroma Transient Improvement 50 5.3.2.10 Analog Back End 51 5.3.2.11 Analog RGB Insertion 51 5.3.2.12 CRT Measurement and Control 51 5.3.2.13 Synchronization and Deflection 52 5.3.2.14 EHT Compensation 52 5.4 MICROCONTROLLER 52 5.4.1MICROCONTROLLER FEATURES 52 5.4.2 ACQUISITION FEATURES 53 5.4.3PORTS 53 5.4.4 -CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE 53 5.4.5TUNING 54 5.4.6AUTOMATIC PICTURE FORMAT SWITCHING 54 5.4.6.1 WSS Data 54 5.4.6.2 SCART Pin 8 Data (Slow Switching) 55 5.4.6.3 Picture Format Description 55 5.4.6.3.1 16:9 CRT 55 5.4.6.3.2 4:3 CRT 56 5.4.7EXTERNAL SOURCE CONTROL LOGIC 57 5.4.8OVER CURRENT PROTECTION 58 5.5 TELETEXT DISPLAY 58 5.6 SOUND PROCESSING 59 5.6.1 ANALOGUE SOUND IF - INPUT SECTION 59 5.6.2QUADRATURE MIXERS 59 5.6.3PHASE AND AM DISCRIMINATION 59 5.6.4NICAM DECODER 60 5.6.5DSP SECTION 60 5.6.6SOUND MODE SWITCHING 60 5.7 SOUND AMPLIFICATION 60 5.7.1POWER AMPLIFIER 60 5.7.2MODE SELECTION 60 5.8 VERTICAL DEFLECTION 61 5.8.1 FLYBACK VOLTAGE 61 5.8.2PROTECTION 61 5.8.3GUARD CIRCUIT 61 5.8.4DAMPING RESISTOR 61 5.8.5EAST-WEST AMPLIFIER (TDA8358J ONLY) 61 5.9 POWER SUPPLY (STR F6654) 61 5.9.1STR-F6654 GENERAL DESCRIPTION 61 CP830F Service Manual -4- 5.9.2POWER SUPPLY PRIMARY PART OPERATIONS 61 5.9.2.1 Start -up Circuit: VIN 62 5.9.2.2 STR-F6654 Oscillating Operation 63 5.9.2.3 STR-F6654 Protection Circuits 64 5.10 TV START-UP, TV NORMAL RUN AND STAND BY MODE OPERATIONS 65 5.10.1 TV START-UP OPERATIONS 65 5.10.1.1 Schematic Diagram For Start-Up Operations 65 5.10.1.2 TV Start-Up And Microcontroller Initialisation 65 5.10.2 TV NORMAL RUN AND STAND-BY MODE OPERATIONS 67 5.10.2.1 TV On Normal Run Mode 67 5.10.2.2 TV Set On Stand-By Mode 70 6 SERVICE PARTS LIST 72 6.1 DTH-29U7ZL 72 6.2 DTG-2881ZL 80 7 EXPLODED VIEW 88 7.1 DTH-29U7 88 7.2 DTH-29U8 89 7.3 DTH-2881 90 7.4 DTH-28W8 91 7.5 DTG-28W9 92 8 PRINTED CIRCULT BOARD 93 8.1 MAIN PCB 93 8.2 CRT PCB 94 8.3 PFC PCB 95 9 SCHEMATIC DIAGRAM 96
  5. 39 downloads

    SAMSUNG PROJECTION TV RECEIVER Chassis : J54A(P) C2.0 Model: SP42W5HF1X/XEE SP42W5HF1X/XEN SP42W5HF1X/XET CONTENTS Alignment and Adjustments Exploded View and Parts List Electric Parts List PCB Diagrams Schematic Diagrams
  6. File Name: SAMSUNG SP42W5HFX1 - CH. J54AP service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: Samsung SAMSUNG PROJECTION TV RECEIVER Chassis : J54A(P) C2.0 Model: SP42W5HF1X/XEE SP42W5HF1X/XEN SP42W5HF1X/XET CONTENTS Alignment and Adjustments Exploded View and Parts List Electric Parts List PCB Diagrams Schematic Diagrams
  7. 88 downloads

    LCD TV SERVICE MANUAL CHASSIS : LD03B MODEL : 42LD650/680 42LD650/680-ZC MODEL : 42LD650N/690 42LD650N/690-ZC MODEL : 42LD651/690 42LD651/690-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Advice : IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts. 2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC. Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas). "Small-Signal" Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close as possible to the component body. 2. Bend into a "U" shape the end of each of three leads remaining on the circuit board. 3. Bend into a "U" shape the replacement transistor leads. 4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection. Power Output, Transistor Device Removal/Replacement 1. Heat and remove all solder from around the transistor leads. 2. Remove the heat sink mounting screw (if so equipped). 3. Carefully remove the transistor from the heat sink of the circuit board. 4. Insert new transistor in the circuit board. 5. Solder each transistor lead, and clip off excess lead. 6. Replace heat sink. Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicular y to the circuit board. 3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder. Fuse and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. 3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.
  8. File Name: LG 42LD650 service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: LG LCD TV SERVICE MANUAL CHASSIS : LD03B MODEL : 42LD650/680 42LD650/680-ZC MODEL : 42LD650N/690 42LD650N/690-ZC MODEL : 42LD651/690 42LD651/690-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Advice : IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts. 2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC. Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas). "Small-Signal" Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close as possible to the component body. 2. Bend into a "U" shape the end of each of three leads remaining on the circuit board. 3. Bend into a "U" shape the replacement transistor leads. 4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection. Power Output, Transistor Device Removal/Replacement 1. Heat and remove all solder from around the transistor leads. 2. Remove the heat sink mounting screw (if so equipped). 3. Carefully remove the transistor from the heat sink of the circuit board. 4. Insert new transistor in the circuit board. 5. Solder each transistor lead, and clip off excess lead. 6. Replace heat sink. Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicular y to the circuit board. 3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder. Fuse and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. 3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.
  9. 82 downloads

    LCD TV SERVICE MANUAL CHASSIS : LD01B MODEL : 42LD550/558 42LD550/558-ZC MODEL : 42LD551/559 42LD551/559-ZA MODEL : 42LD550N 42LD550N-ZC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections). 1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary). 2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern. 3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection. 4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire. At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board. 1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens. 2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern. 3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.
  10. File Name: LG 42LD550 service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: LG LCD TV SERVICE MANUAL CHASSIS : LD01B MODEL : 42LD550/558 42LD550/558-ZC MODEL : 42LD551/559 42LD551/559-ZA MODEL : 42LD550N 42LD550N-ZC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections). 1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary). 2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern. 3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection. 4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire. At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board. 1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens. 2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern. 3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.
  11. 29 downloads

    SAMSUNG COLOR TELEVISION RECEIVER Chassis : KS1A(P)_Rev.1 Model : CS20S5ZX/TRI CS21S1STX/TRI CS20F2ZX/TRI CB21F12ZSXXEC CS14H2ZX/TAW CS14S1ZX/ANB CS14S1ZX/FAT CS20H2X/SIG CS20R1ZS/CBM CS20S4ZX/NIK CS20S5SX/FAT CONTENTS Precautions Specifications and IC Data Disassembly and Reassembly Alignment and Adjustment Troubleshooting Exploded View and Parts List Electrical Parts List Block Diagram Wiring Diagram Schematic Diagrams
  12. File Name: Samsung CB21F12Z CS20S5Z CS20F2Z service manual File Submitter: anton File Submitted: 21 Dec 2010 File Updated: 21 Dec 2010 File Category: Samsung SAMSUNG COLOR TELEVISION RECEIVER Chassis : KS1A(P)_Rev.1 Model : CS20S5ZX/TRI CS21S1STX/TRI CS20F2ZX/TRI CB21F12ZSXXEC CS14H2ZX/TAW CS14S1ZX/ANB CS14S1ZX/FAT CS20H2X/SIG CS20R1ZS/CBM CS20S4ZX/NIK CS20S5SX/FAT CONTENTS Precautions Specifications and IC Data Disassembly and Reassembly Alignment and Adjustment Troubleshooting Exploded View and Parts List Electrical Parts List Block Diagram Wiring Diagram Schematic Diagrams
  13. 29 downloads

    Samsung F70 PLASMA DISPLAY TV Chassis : F70A(P_FHD)_B850 Model : PS58B850Y1WXBT PS58B850Y1WXRU PS58B850Y1WXXU Table of Contents 1. Precaution 1-1 Safety Precautions......................................................................................................................................................1-1 1-2 Servicing Precautions..................................................................................................................................................1-3 1-3 Static Electricity Precautions.......................................................................................................................................1-4 1-4 Installation Precautions...............................................................................................................................................1-5 2. Product Specification 2-1 Product Specification...................................................................................................................................................2-1 2-2 Specifications Analysis................................................................................................................................................2-3 2-3 Accessories.................................................................................................................................................................2-4 3. Disassembly & Reassembly 3-1 Overall Disassembly & Reassembly............................................................................................................................3-1 4. Troubleshooting 4-1 Troubleshooting...........................................................................................................................................................4-1 4-2 Adjustment...................................................................................................................................................................4-9 4-3 Upgrade.......................................................................................................................................................................4-34 5. Exploded View & Part List 5-1 PS58B850Y1WXBT Exploded View............................................................................................................................5-1 5-2 PS58B850Y1WXRU Exploded View...........................................................................................................................5-3 5-3 PS58B850Y1WXXU Exploded View............................................................................................................................5-5 5-4 PS58B850Y1WXBT Service Item................................................................................................................................5-6 5-5 PS58B850Y1WXRU Service Item...............................................................................................................................5-7 5-6 PS58B850Y1WXXU Service Item...............................................................................................................................5-8 6. Wiring Diagram 6-1 Overall Wiring..............................................................................................................................................................6-1
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