background image

10 PCB Layout

10-1

10 PCB Layout
10-1 Main PCB Layout

D601

DIODE-ARRAY

143.6 142.7 

D907

DIODE-ARRAY

11.0 22.8 

D101

DIODE-RECTIFIER

43.8 117.7 

D102

DIODE-RECTIFIER

104.7 140.8 

D200

DIODE-SWITCHING

156.3 110.5 

D600

DIODE-SWITCHING

124.7 140.2 

D701

DIODE-SWITCHING

20.9 88.5 

D702

DIODE-SWITCHING

45.4 81.9 

D800

DIODE-SWITCHING

66.0 104.5 

D908

DIODE-SWITCHING

24.9 45.1 

D909

DIODE-SWITCHING

25.5 40.4 

D910

DIODE-SWITCHING

31.9 40.4 

D912

DIODE-SWITCHING

17.1 22.8 

D913

DIODE-SWITCHING

24.6 22.7 

D915

DIODE-SWITCHING

149.6 26.3 

D948

DIODE-SWITCHING

100.8 33.9 

D949

DIODE-SWITCHING

97.6 38.7 

D951

DIODE-SWITCHING

4.2 87.9 

D952

DIODE-SWITCHING

3.1 83.4 

D953

DIODE-SWITCHING

7.3 84.2 

D954

DIODE-SWITCHING

3.1 79.0 

D955

DIODE-SWITCHING

7.3 75.4 

D956

DIODE-SWITCHING

3.1 73.5 

D957

DIODE-SWITCHING

6.9 71.1 

D602

DIODE-ZENER

149.8 144.8 

D904

DIODE-ZENER

51.3 41.5 

D916

DIODE-ZENER

149.5 17.7 

D917

DIODE-ZENER

3.0 40.2 

D918

DIODE-ZENER

16.8 39.9 

D919

DIODE-ZENER

8.6 40.2 

D920

DIODE-ZENER

149.5 21.9 

D928

DIODE-ZENER

2.2 27.6 

D950

DIODE-ZENER

153.5 26.0 

D201

DIODE-ZENER

141.4 86.4 

D603

DIODE-ZENER

155.0 116.3 

D604

DIODE-ZENER

148.1 116.2 

D900

DIODE-ZENER

106.9 39.0 

D901

DIODE-ZENER

110.6 33.5 

D902

DIODE-ZENER

59.7 22.2 

D903

DIODE-ZENER

82.8 27.0 

D905

DIODE-ZENER

55.7 22.1 

D906

DIODE-ZENER

78.5 22.2 

D911

DIODE-ZENER

6.2 57.9 

D914

DIODE-ZENER

13.9 57.9 

D921

DIODE-ZENER

73.2 41.4 

D922

DIODE-ZENER

73.2 43.7 

D923

DIODE-ZENER

73.3 48.5 

D924

DIODE-ZENER

73.2 46.2 

D925

DIODE-ZENER

55.2 41.5 

D926

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 

125.6 

IC601

IC-AUDIO AMP

148.8 

129.2 

IC902

IC-CMOS LOGIC

28.8 

51.4 

IC903

IC-CMOS LOGIC

28.6 

51.2 

IC108

IC-DC/DC CONVERTER

42.1 

127.8 

IC110

IC-DC/DC CONVERTER

107.2 

151.3 

IC900

IC-EEPROM

4.5 18.0 

IC705

IC-EEPROM

32.4 85.7 

IC805

IC-EEPROM

72.7 80.7 

IC703

IC-FLASH MEMORY

0.0 

0.0 

IC704

IC-LCD CONTROLLER

25.8 

81.3 

IC109

IC-POSI.FIXED REG.

53.8 

134.9 

IC706

IC-REAL TIME CLOCK

4.8 

104.4 

IC500

IC-VIDEO SWITCH

43.8 

49.1 

IC501

IC-VIDEO SWITCH

50.4 

59.0 

IC300

IC-VOL. DETECTOR

105.2 

60.6 

IC105

IC-VOLTAGE REGULATOR

49.1 

108.6 

IC112

IC-VOLTAGE REGULATOR

117.4 

120.2 

IC101

IC-VOLTAGE REGULATOR

114.1 

132.7 

IC111

IC-VOLTAGE REGULATOR

107.0 

118.4 

Q200

TR-SMALL SIGNAL

146.5 

110.4 

Q600

TR-SMALL SIGNAL

156.3 

138.1 

Q601

TR-SMALL SIGNAL

150.5 

140.8 

Q602

TR-SMALL SIGNAL

139.5 

142.7 

Q603

TR-SMALL SIGNAL

129.3 

140.2 

Q800

TR-SMALL SIGNAL

87.6 

62.0 

Q902

TR-SMALL SIGNAL

149.7 

26.0 

Q100

TR-SMALL SIGNAL

14.9 

119.9 

Q101

TR-SMALL SIGNAL

14.4 

128.1 

Q104

TR-SMALL SIGNAL

16.6 

132.9 

Q805

TR-SMALL SIGNAL

62.6 

104.5 

Q810

TR-SMALL SIGNAL

56.4 

83.2 

Q900

TR-SMALL SIGNAL

149.6 

31.2 

Q901

TR-SMALL SIGNAL

145.6 

31.2 

Q801

TR-SMALL SIGNAL

91.5 

62.2 

Q802

TR-SMALL SIGNAL

53.1 

97.5 

Q803

TR-SMALL SIGNAL

53.1 

101.4 

Q804

TR-SMALL SIGNAL

57.1 

106.5 

Q809

TR-SMALL SIGNAL

131.7 

99.7 

TRANSISTOR

IC

Loc. No. Description

X

DIODE

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 ...

Reviews: