3-1
SECTION 3
ELECTRICAL
CONTENTS
SOFTWARE CORRUPTION PROBLEM
.....................................................................................................3-2
ELECTRICAL TROUBLESHOOTING GUIDE
............................................................................................3-5
1. POWER(SMPS) CIRCUIT.........................................................................................................................3-5
2. AUDIO CIRCUIT .......................................................................................................................................3-7
1) NO ATSC AUDIO
.....................................................................................................................................3-7
2) NO OPTICAL OUTPUT AUDIO
...............................................................................................................3-11
3) NO COAXIAL OUTPUT AUDIO
..............................................................................................................3-12
3. CPU (SYSTEM CONTROL) TROUBLESHOOTING ..............................................................................3-14
4. VIDEO TROUBLESHOOTING FLOW ....................................................................................................3-21
5. ATSC/ QAM FRONT- END TROUBLESHOOTING FLOW ....................................................................3-31
6. FRONT PANEL TROUBLESHOOTING FLOW ......................................................................................3-32
OVERALL BLOCK DIAGRAM.........................................................................................................................3-34
1. OVERALL BLOCK DIAGRAM 1 ............................................................................................................3-34
2. OVERALL BLOCK DIAGRAM 2 ............................................................................................................3-36
3. OVERALL BLOCK DIAGRAM 3 ............................................................................................................3-38
BLOCK DIAGRAM & SIGNAL FLOW.............................................................................................................3-40
1. POWER(SMPS) BLOCK DIAGRAM ......................................................................................................3-40
2. SYSTEM CONTRL BLOCK DIAGRAM..................................................................................................3-42
3. AUDIO PROCESSING BLOCK DIAGRAM ............................................................................................3-44
4. VIDEO PROCESSING BLOCK DIAGRAM ............................................................................................3-46
CIRCUIT DIAGRAM .........................................................................................................................................3-48
1. POWER(SMPS) CIRCUIT DIAGRAM ....................................................................................................3-48
2. CPU, AUDIO, POWER CIRCUIT DIAGRAM..........................................................................................3-50
3. HD2, TUNER, DVI CIRCUIT DIAGRAM .................................................................................................3-52
4. ATSCII-STB CIRCUIT DIAGRAM ...........................................................................................................3-54
5. FRONT CIRCUIT DIAGRAM ..................................................................................................................3-56
PRINTED CIRCUIT DIAGRAMS......................................................................................................................3-58
1. DIGITAL MAIN P.C.BOARD(BOTTOM)..................................................................................................3-58
2. DIGITAL MAIN P.C.BOARD(TOP)..........................................................................................................3-60
3. FRONT P.C.BOARD ...............................................................................................................................3-62
4. POWER P.C.BOARD ..............................................................................................................................3-62
Summary of Contents for LST-3100A
Page 17: ...3 8 Fig 01 12 2880MHz clock Fig 02 48KHz clock Fig 04 Analog Audio Signal Fig 03 Data Signal ...
Page 19: ...3 10 Fig 06 Analog Audio Signal ...
Page 22: ...3 13 Fig 07 Digital Audio Signal Fig 08 Coaxial Digital Audio Signal ...
Page 31: ...3 23 FIG 04 V sync signal FIG 03 H sync signal ...
Page 33: ...3 25 FIG 05 Input Stream to IC203 FIG 06 Interrupt Signal ...
Page 34: ...3 26 ...
Page 35: ...3 27 ...
Page 36: ...3 28 YES D Check analog buffers IC303 for 480i Jump to A flow ...
Page 50: ...3 50 3 51 2 CPU AUDIO POWER CIRCUIT DIAGRAM ...
Page 51: ...3 52 3 53 3 HD2 TUNER DVI CIRCUIT DIAGRAM ...
Page 52: ...3 54 3 55 4 ATSCII STB CIRCUIT DIAGRAM ...
Page 53: ...3 56 3 57 5 FRONT CIRCUIT DIAGRAM ...
Page 54: ...3 58 3 59 PRINTED CIRCUIT DIAGRAMS 1 DIGITAL MAIN P C BOARD BOTTOM LOCATION GUIDE ...
Page 55: ...3 60 3 61 2 DIGITAL MAIN P C BOARD TOP ...
Page 56: ...3 62 3 63 3 FRONT P C BOARD 4 POWER P C BOARD LOCATION GUIDE ...
Page 57: ......
