Sharp LC46D43U Service Manual - Page 26
Sharp LC46D43U - Aquos - 720p LCD HDTV Manual
UPC - 890552648849
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LC -42D 43U LCC-H42AD43PUTER 4. TROUBLESHOOTING TABLEService Manual [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? YES Are audio outputs of pins 38 and 39 of IC1404 normal? YES Is audio input from pins 38 and 39 of IC1404 to pins 3 and 5 of IC2701(STEREO_AMP) normal? YES Is audio output from IC2701 normal? NO Check between pins 29 and 30 of IC1401 and pins 51 and 52 of IC1404 (CODEC). NO Are the DSP_LRCK, DSP_BCKIN, DSP_SDIN1, DSP_MCLK, DSP_SDOUT1, DSP_SDOUT2 signals sent from IC1404 to IC1407 (DSP) normally? YES Check IC1404 and peripheral circuits. NO Check the circuits between pins 38 and 39 of IC1404 and pins 3 and 5 of IC2701. (MUTE circuits: Q1307, Q1314, Q1313) 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). 4 - 1