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LC-40LE831E (serv.man17). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 5

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LC-40/46LE830E, RU/831E, S
6 – 5
No sound (during the reception of TV (DIGITAL-Satellite) broadcasting)
(DIGITAL-Satellite is only function for LE830 series)
Does not the sound go out though the picture has come out when DTV is received?
                                            
Do TS signals output to pins [44/TS_TUOUT_CLK, 46/
TS_TUOUT_SYNC, 45/TS_TUOUT_VAL, 43~36/
TS_TUOUT_D0~7] of TUNER(TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Do TS signals input to pins [45/S2_TS_CLK, 46/S2_TS_SYNC, 
47/S2_TS_VAL, 48,51~57/S2_TS_DATA0~7] of IC4402 (CI Cont 
& DTB-T/C Demod)?
NO
Check the line between TU1102 and IC4402.
YES
Do TS signals output to pins [15/DEMOD_TS_DATA0, 16/
DEMOD_TS_SYNC, 17/DEMOD_TS_VAL, 18/
DEMOD_TS_CLK] of IC4402? 
NO
Check IC4402 and its peripheral circuits.
YES
Do TS signals input to pins [U30/DEMOD_TSDATA0, V30/
DEMOD_TSSYNC, V29/DEMOD_TSVAL, U32/
DEMOD_TSCLK] of IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between IC4402 and IC3303.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
No sound from external input devices (1)
Does not the sound of the audio signal input to EXT1 go out?
                                            
Do audio signals input to pins [2/AUDIO_IN_R, 6/AUDIO_IN_L] 
of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Do audio signals input to pins [AM32/SC1_AINR0, AM30/
SC1_AINL0] of IC3303 (Digital AV decode & Main CPU) from 
SC505?
NO
Check the line between SC505 and IC3303.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
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