L C - 4 2 D 4 3 U
4 – 1
LC-42D43U
Service Manual
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No audio output during UHF/VHF reception
Is SIF output from the tuner (TU1101_Pin15) normal?
NO
Check the tuner and peripheral circuits.
YES
Is input signal fed to pin 21 of IC1401 (SIF Demodulator) normal?
NO
Check the filter circuits (Q1102-3) and peripheral circuits.
YES
Are audio signals from pins 29 and 30 of IC1401 to pins 51 and
52 of IC1404 (CODEC) normal?
NO
Check between pins 29 and 30 of IC1401 and pins 51 and 52 of
IC1404 (CODEC).
YES
Are audio outputs of pins 38 and 39 of IC1404 normal?
NO
Are the DSP_LRCK, DSP_BCKIN, DSP_SDIN1, DSP_MCLK,
DSP_SDOUT1, DSP_SDOUT2 signals sent from IC1404 to
IC1407 (DSP) normally?
YES
YES
Check IC1404 and peripheral circuits.
Is audio input from pins 38 and 39 of IC1404 to pins 3 and 5 of
IC2701(STEREO_AMP) normal?
NO
Check the circuits between pins 38 and 39 of IC1404 and pins 3
and 5 of IC2701. (MUTE circuits: Q1307, Q1314, Q1313)
YES
Is audio output from IC2701 normal?
NO
Check IC2701 and peripheral circuits.
YES
Check the connector (P2703) of TERMINAL_UNIT and around
the speakers.
No monitor audio output
Is monitor audio output set to “Variable”?
YES
Reset monitor audio output to “Fixed”.
NO
Are audio output pins 40 and 41 of IC1404 (CODEC) normal?
NO
Check IC1404 and peripheral circuits.
YES
Are audio output pins 7 and 1 of IC1408 (Buffer_AMP) normal?
NO
Check IC1408 and peripheral circuits.
YES
Check between IC1408 and MONITOR OUTPUT terminal (J502).
Summary of Contents for Aquos LC-42D~43U
Page 5: ...LC 42D43U 1 1 LC 42D43U Service Manual CHAPTER 1 OPERATION MANUAL 1 SPECIFICATIONS ...
Page 6: ...LC 42D43U 1 2 2 OPERATION MANUAL ...
Page 7: ...LC 42D43U 1 3 ...
Page 8: ...LC 42D43U 1 4 ...
Page 9: ...LC 42D43U 1 5 ...
Page 10: ...LC 42D43U 1 6 ...
Page 11: ...LC 42D43U 1 7 ...
Page 12: ...LC 42D43U 1 8 3 DIMENSIONS ...
Page 33: ...LC 42D43U 3 2 30 80 80 1 CN2 IC1 7 QCNW G417WJQZ 14 12 CN7502 LA2 CN7501 LA1 ...
Page 36: ...LC 42D43U 3 5 MEMO ...
Page 38: ...LC 42D43U 4 2 2 SCHEMATIC DIAGRAM 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 1 ...
Page 39: ...LC 42D43U 4 3 11 13 12 14 15 16 18 19 17 ...
Page 40: ...LC 42D43U 4 4 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 2 ...
Page 41: ...LC 42D43U 4 5 11 13 12 14 15 16 18 19 17 ...
Page 42: ...LC 42D43U 4 6 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 3 ...
Page 43: ...LC 42D43U 4 7 11 13 12 14 15 16 18 19 17 ...
Page 44: ...LC 42D43U 4 8 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 4 ...
Page 45: ...LC 42D43U 4 9 11 13 12 14 15 16 18 19 17 ...
Page 46: ...LC 42D43U 4 10 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 5 ...
Page 47: ...LC 42D43U 4 11 11 13 12 14 15 16 18 19 17 ...
Page 48: ...LC 42D43U 4 12 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 6 ...
Page 49: ...LC 42D43U 4 13 11 13 12 14 15 16 18 19 17 ...
Page 50: ...LC 42D43U 4 14 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 7 ...
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Page 52: ...LC 42D43U 4 16 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 8 ...
Page 53: ...LC 42D43U 4 17 11 13 12 14 15 16 18 19 17 ...
Page 54: ...LC 42D43U 4 18 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 9 ...
Page 55: ...LC 42D43U 4 19 11 13 12 14 15 16 18 19 17 ...
Page 56: ...LC 42D43U 4 20 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 10 ...
Page 57: ...LC 42D43U 4 21 11 13 12 14 15 16 18 19 17 ...
Page 58: ...LC 42D43U 4 22 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 11 ...
Page 59: ...LC 42D43U 4 23 11 13 12 14 15 16 18 19 17 ...
Page 60: ...LC 42D43U 4 24 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 12 ...
Page 61: ...LC 42D43U 4 25 11 13 12 14 15 16 18 19 17 ...
Page 62: ...LC 42D43U 4 26 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 13 ...
Page 63: ...LC 42D43U 4 27 11 13 12 14 15 16 18 19 17 ...
Page 64: ...LC 42D43U 4 28 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 14 ...
Page 65: ...LC 42D43U 4 29 11 13 12 14 15 16 18 19 17 ...
Page 66: ...LC 42D43U 4 30 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 15 ...
Page 67: ...LC 42D43U 4 31 11 13 12 14 15 16 18 19 17 ...
Page 68: ...LC 42D43U 4 32 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 16 ...
Page 69: ...LC 42D43U 4 33 11 13 12 14 15 16 18 19 17 ...
Page 70: ...LC 42D43U 4 34 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 17 ...
Page 71: ...LC 42D43U 4 35 11 13 12 14 15 16 18 19 17 ...
Page 72: ...LC 42D43U 4 36 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 18 ...
Page 73: ...LC 42D43U 4 37 11 13 12 14 15 16 18 19 17 ...
Page 74: ...LC 42D43U 4 38 1 2 3 4 5 6 7 9 10 8 J A B C D E F G H I MAIN Unit 19 ...
Page 75: ...LC 42D43U 4 39 11 13 12 14 15 16 18 19 17 ...
Page 76: ...LC 42D43U 4 40 AV TERMINAL Unit 1 2 ...
Page 77: ...LC 42D43U 4 41 ...
Page 78: ...LC 42D43U 4 42 AV TERMINAL Unit 2 2 ...
Page 79: ...LC 42D43U 4 43 ...
Page 80: ...LC 42D43U 4 44 MEMO ...
Page 104: ...LC 42D43U 24 7 PACKING PARTS S5 S4 S4 S3 S1 S2 S4 S4 S7 S6 ...