Samsung LA20S51B Service Manual Download Page 20 | Manualshive

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8 Block Diagrams

8-2

8-2 Input Power Block Diagram

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Summary of Contents for LA20S51B

Page 1: ...LCD TV CONTENTS 1 Precautions 2 Product Specifications 3 Disassembly Reassembly 4 Alignment Adjustments 5 Troubleshooting 6 Exploded View Parts List 7 Electrical Parts List 8 Block Diagram 9 Wiring Diagram 10 PCB Layout 11 Schematic Diagrams 12 Panel Description ...

Page 2: ...GND Pb Cb GND Pr Cr GND Audio L GND Audio R GND 2 2 1 DVD RCA White RCA Red CVBS Audio L GND Audio R GND 2 2 3 A V RCA Yellow Pin Separate 1 2 3 4 5 GND Y C GND GND 2 2 2 S Video Pin Separate Red Green Blue GND GND DDC Return GND Red GND Green GND Blue No Connection GND Sync Self Test GND DDC Data H Sync V Sync DDC Clock 2 2 4 D SUB ...

Page 3: ...13 328 0 050 0 466 12 795 0 017 78 750 Positive Positive Separate 31 469 31 777 3 813 1 589 26 058 0 318 70 087 14 268 0 064 0 858 13 155 0 191 28 322 Negative Positive Separate µ µ µ µ µ IBM 640 75 Hz 60Hz 72Hz 640 x 480 800 75 Hz 56Hz 60Hz 72Hz 800 x 600 1024 60Hz 1024 x 768 VGA2 70 Hz 720 x 400 VGA3 60 Hz 640 x 480 Table 2 1 Timing Chart 31 469 31 778 3 813 1 589 26 058 0 318 59 940 16 683 0 06...

Page 4: ...tically sensitive devices Use caution when handling these components 3 1 Disassembly Cautions 1 Disconnect the monitor from the power source before disassembly 2 Follow these directions carefully never use any metal instrument except provided jig to separate the cabinet 1 Place monitor face down on cushioned table and r emove 6 screws and remove stand 2 Lift up the rear cover and remove 7 screws f...

Page 5: ...3 Disassembly and Reassembly 3 2 3 Remove 8 screws from the main board and disconnect cables 4 Lift up the power board and main board 5 Remove 6 screws from the BRKT and lift up the BRKT ...

Page 6: ...ssembly 3 3 1 After confirm there is nothing on the desk turn the LCD module over and put it on a flat desk set to the ground 2 Remove 2 screws for the lamp unit 3 2 Replacement Order of Lamp Assemblies 5 Lift up the panel ...

Page 7: ...embly Reassembly procedures are in the reverse order of disassembly procedures 4 Please fix the new lamp units on the LCD module opposite process 2 and 3 3 Slide the lamp unit out Please take out the lamp unit from the LCD module Slide the lamp unit out Slide the lamp unit out ...

Page 8: ...matching is essential 4 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 result 5 Connect the TV only to an DC power source with voltage and frequency as specified on the backcover nameplate 6 Do not attempt to connect or disconnect any wire while the TV is turned on Make su...

Page 9: ... 2 1 Entering Factory Mode 1 To enter Service Mode Press the remote control keys in this sequence If you do not have Factory remote control If you have Factory remote control 4 2 2 Factory Mode Tree 4 Alignments and Adjustments 4 2 ...

Page 10: ...4 Alignments and Adjustments 4 3 ...

Page 11: ...4 Alignments and Adjustments 4 4 ...

Page 12: ...y 5 Green 6 Color Bar 7 Cross 8 Bus Stop Bus stop is used data communication 9 Chcek Sum Display the current check sum size of the MICOM 10 Reset Initializes the data in the MICOM 11 T VNC25PEA 0004 2004 06 22 Display the MICOM program version 4 2 3 White Balance High Low 263 5 267 5 267 5 263 5 x y x y ...

Page 13: ...4 2 4 Calibration 4 Alignments and Adjustments 4 6 ...

Page 14: ...f CN100 Check CN803 Pin3 Pin9 in I P Board Yes No No No No No Does proper DC A5V appear at FT144 Check IC101 and IC105 Yes Does proper B3 3V appear at Pin 2 of IC111 Check IC111 Yes Does proper DC B1 8V appear at Pin 4 of IC112 Check IC112 Yes Does proper DC B8V appear at FT130 Check IC109 1 2 3 4 5 ...

Page 15: ...oting 5 2 No No No Check IC704 and IC802 Yes Does proper DC 5V_P appear at Pin 2 of IC104 Check IC104 Yes Does proper DC 9V_S appear at FT127 Check IC110 Yes Yes Does proper DC B5V appear at FT131 Check IC108 6 7 8 ...

Page 16: ...5 Troubleshooting 5 3 WAVEFORMS 1 2 5 3 6 4 4 7 8 ...

Page 17: ...5 Troubleshooting 5 4 5 2 No Picture TV Video S Video DVD Check C800 TV Check C822 Video Check C824 S Video Check C821 DVD Check the input signal Yes Check the IC802 WAVEFORMS 9 9 No ...

Page 18: ...D Pin 117 118 PC of IC802 VCTj RF Check Tu01 TV Tuner Video Check the CN913 DVD Check the CN901 Yes Does the signal appear at Pin 123 124 of IC802 VCTj Check IC802 Yes Does the signal appear at Pin 2 5 of Pin 16 19 IC600 Check the IC600 Audio amp and related circuit of IC600 Yes Replace the speaker 5 3 No Sound No No No ...

Page 19: ...8 Block Diagrams 8 1 8 Block Diagram This Document can not be used without Samsung s authorization 8 1 Signal Path Block Diagram ...

Page 20: ...8 Block Diagrams 8 2 8 2 Input Power Block Diagram ...

Page 21: ...926 DIODE ZENER 111 2 33 7 D927 DIODE ZENER 103 2 38 3 D930 DIODE ZENER 71 2 22 2 D932 DIODE ZENER 82 5 13 6 D934 DIODE ZENER 82 5 17 9 D936 DIODE ZENER 67 0 22 1 D940 DIODE ZENER 31 4 22 3 Loc No Description X D941 DIODE ZENER 35 5 22 3 D942 DIODE ZENER 40 8 22 2 D945 DIODE ZENER 37 7 36 1 D946 DIODE ZENER 100 7 28 4 D947 DIODE ZENER 95 3 23 4 D944 DIODE ZENER 44 9 22 2 IC600 IC AUDIO AMP 134 7 1...

Page 22: ...9 1 9 Schematic Diagrams 9 Wiring Diagram ...

Page 23: ...11 1 11 Schematic Diagrams 11 Schematic Diagrams This Document can not be used without Samsung s authorization 11 1 Input Power Sound Schematic Diagram ...

Page 24: ...11 Schematic Diagrams 11 2 1 2 5 3 6 4 7 8 11 Schematic Diagrams 9 ...

Page 25: ...11 3 11 Schematic Diagrams This Document can not be used without Samsung s authorization 11 2 Video Decoder Schematic Diagram ...

Page 26: ...11 5 11 Schematic Diagrams This Document can not be used without Samsung s authorization 11 3 Output Scaler LVDS Schematic Diagram ...

Page 27: ...11 Schematic Diagrams 11 6 This Document can not be used without Samsung s authorization 11 4 IP Board_1 Schematic Diagram ...

Page 28: ...11 7 11 Schematic Diagrams This Document can not be used without Samsung s authorization 11 7 IP Board_2 Schematic Diagram ...

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