Sharp LC-70LE741E (serv.man3) Service Manual ▷ View online
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E (1st Edition)
6 – 24
No sound (during the reception of TV (ANALOG) broadcasting)
Does not the sound go out though the picture has come out when UHF/VHF is received?
In the case of LE840,LE843 series, refer to (A).
In the case of LE841 series, refer to (B).
(B)
(A)
Does SIF signal output from pin (8) of TUNER
(TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does SIF signal input to pin [AM24/CPU_ATV_IF+] of
IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between TU1102 and IC3303. (Q1102, etc.)
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
Does SIF signal output from pin (8) of TUNER (TU1104)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does SIF signal input to pin [AM24/CPU_ATV_IF+] of IC3303
(Digital AV decode & Main CPU)?
NO
Check the line between TU1104 and IC3303. (Q1102, etc.)
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E (1st Edition)
6 – 25
No sound (during the reception of TV (DIGITAL) broadcasting)
Does not the sound go out though the picture has come out when DTV is received?
In the case of LE840,LE843 series, refer to (A).
In the case of LE841 series, refer to (B).
(B)
(A)
Do IF signals output to pins [10, 11] of TUNER
(TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Do IF signals input to pins [35/IFPGA_INN, 36/
IFPGA_INP] of IC4402 (CI Cont & DTB-T/C Demod)?
NO
Check the line between IC1102 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.”
Do TS signals output to pins [19/TS_TUOUT_CLK, 17/
TS_TUOUT_SYNC, 18/TS_TUOUT_VAL, 20~27/
TS_TUOUT_D0~7] of TUNER (TU1104)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Do TS signals input to pins [45/TS_TUOUT_CLK, 46/
TS_TUOUT_SYNC, 47/TS_TUOUT_VAL, 48, 51~57/
TS_TUOUT_D0~7] of IC4402 (CI Cont & DTB-T/C Demod)?
NO
Check the line between TU1104 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.”
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E (1st Edition)
6 – 26
No sound (during the reception of TV (DIGITAL-Satellite) broadcasting)
(DIGITAL-Satellite is only function for LE840,LE843 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.”
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E (1st Edition)
6 – 27
No sound from external input devices (2)
Does not the sound of the audio signal input to EXT2 go out?
• Do audio signals input to pins[2/CVBS1_IN_R, 3/
CVBS1_IN_L] of EXT2 (J511)?
• Is CVBS_PLUG [4/CVBS1_PLUG] of J511 at “L”
NO
Check the setting of an external input device that connects with
EXT2.
YES
Do audio signals input to pins [AL32/CVBS1_AINR2, AL30/
CVBS1_AINL2] of IC3303 (Digital AV decode & Main CPU)?
NO
Check IC3303 and its peripheral circuits.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
No sound from external input devices (3)
Does not the sound of the audio signal input to EXT3 go out?
Do audio signals input to pins [7/COMP1_IN_R, 8/COMP1_IN_L]
of EXT3 (J511)?
NO
Check the setting of an external input device that connects with
EXT3.
YES
Do audio signals input to pins [AK29/COMP1_AINR1, AK27/
IFCOMP1_AINL1] of IC3303 (Digital AV decode & Main CPU)?
NO
Check IC3303 and its peripheral circuits.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
No sound from external input devices (4)
Does not the sound of the audio signal input to HDMI-2
mode go out?
mode go out?
Does not the sound of the audio signal input to PC/Compo-
nent mode go out?
nent mode go out?
Check whether it is selected “HDMI + Analog” by the Audio select
under Menu-Setup-Option-Terminal setting-Audio select.
Check whether it is selected “Video + Audio” by the Audio select
under Menu-Setup-Option-Terminal setting-Audio select.
YES
YES
Do audio signals input to pins [2/PC/HDMI_L, 3/PC/HDMI_R] of J501 (PC AUDIO_IN)?
YES
NO
Check the setting of an external input device that connects with
J501.
Do audio signals input to pins [AM27/PC_HDMI_AINL4, AJ27/
PC_HDMI_AINR4] of IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between J501 and IC3303.
YES
Refer to “The sound is not emitted from the Speaker & Woofer though the picture has come out.”
