Sharp LC-46X8E (serv.man8) Service Manual / Parts Guide ▷ View online
LC-46X8E/S/RU
4 – 5
No sound from external input devices (4)
The sound input from EXT6 (analog HDMI) doesn’t come out.
The sound input from EXT7 (analog RGB audio) doesn’t come
out.
out.
MAIN UnIT:
Check whether “Analog” has selected in MENU-Option -HDMI
Audio Select.
Audio Select.
MAIN UNIT:
YES
Is audio signal (L/R) sent from pins (2, 3) of EXT6 terminal
(J1502) to pins (1, 6) of IC1504 (SW)?
(J1502) to pins (1, 6) of IC1504 (SW)?
YES
Is audio signal (L/R) sent from pins (2, 3) of EXT7 terminal
(J1501) to pins (3, 7) of IC1504 (SW)?
(J1501) to pins (3, 7) of IC1504 (SW)?
NO
NO
Check the J502 (EXT6), peripheral circuit and connection of
external input devices.
external input devices.
Check the J501 (EXT7), peripheral circuit and connection of
external input devices.
external input devices.
Is audio signal (HDMI_PC_L/HDMI_PC_R) output from pins (15, 11) of IC1504 to pins (24, 26) of connector (SC1101)?
TERMINAL UNIT:
YES
NO
Check the line between IC1504 and SC1101, and their peripheral
circuits.
circuits.
Is audio signal (HDMI_PC_L=MAIN_L, HDMI_PC_R=MAIN_R)
sent to pins (24) and (26) of SC501?
sent to pins (24) and (26) of SC501?
NO
Check the connector (SC1101/SC501)
YES
Is audio signal (MAIN_L/MAIN_R) input to pins (59, 60) of
IC1404 (CODEC)?
IC1404 (CODEC)?
NO
Check the line between SC501 and IC1404.
YES
Refer to “No sound output in all modes”.
No sound from external input devices (5)
The sound input from EXT8 doesn’t come out.
TERMINAL UNIT:
Is audio signal (IN4_L/IN4_R) input from pins (2, 4) of the EXT8
terminal (J502)?
Is audio signal (IN4_L/IN4_R) input from pins (2, 4) of the EXT8
terminal (J502)?
NO
Check the connection to J502 and external devices.
YES
Is audio signal (IN4_L/IN4_R) input to pins (57, 58) of IC1404
(CODEC)?
(CODEC)?
NO
Check the line between J502 and IC1404.
YES
Refer to “No sound output in all modes”.
LC-46X8E/S/RU
4 – 6
The audio signal is not output (1)
The audio signal of UHF/VHF and DTV is not output from EXT1 (SCART1).
TERMINAL UNIT:
Is audio signal (L/R) output from pins (3, 1) of SCART1 (SC502)?
Is audio signal (L/R) output from pins (3, 1) of SCART1 (SC502)?
YES
Check the connection to SCART1 and external devices.
NO
Is S-MUTE signal [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
YES
This signal should be “L”.
Check the peripheral circuits of IC9101 and S-MUTE signal.
(Q502, Q504, etc.)
Check the peripheral circuits of IC9101 and S-MUTE signal.
(Q502, Q504, etc.)
NO
Is audio signal (L/R) output from pins (24, 22) of IC1402 (SOUND
MULTIPLEX DECODER)?
MULTIPLEX DECODER)?
YES
Check the line between SC502 and IC1402.
(Q508, Q507, IC1407, etc.)
(Q508, Q507, IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
The audio signal is not output (2)
The audio signal of UHF/VHF and DTV is not output from EXT2 (SCART2).
TERMINAL UNIT:
Is audio signal (L/R) output from pins (3, 1) of SCART2 (SC503)?
Is audio signal (L/R) output from pins (3, 1) of SCART2 (SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE signal [MAIN_UNIT pin (91) of IC9101 (CPLD)] at
H?
H?
YES
This signal should be “L”.
Check the peripheral circuits of IC9101 and S2-MUTE signal.
(Q501, Q503, etc.)
Check the peripheral circuits of IC9101 and S2-MUTE signal.
(Q501, Q503, etc.)
NO
Is audio signal (L/R) output from pins (3, 13) of IC7510 (SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
(Q506, Q505, etc.)
NO
Is audio signal (L/R) input to pins (2, 15) of IC7510 (SW)?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL signal, etc.)
(SC_AUD_SEL signal, etc.)
NO
Is audio signal (L/R) output from pins (24, 22) of IC1402 (SOUND
MULTIPLEX DECODER)?
MULTIPLEX DECODER)?
YES
Check the line between IC7510 and IC1402.
(IC1407, etc.)
(IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
LC-46X8E/S/RU
4 – 7
The audio signal is not output (3)
The audio signal of MONITOR is not output from EXT2 (SCART2).
TERMINAL UNIT:
Is audio signal (L/R) sent to pins (3, 1) of SCART2 (SC503)?
Is audio signal (L/R) sent to pins (3, 1) of SCART2 (SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE signal [MAIN_UNIT pin (91) of IC9101 (CPLD)] at
H?
H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE signal.
(Q501, Q503, etc.)
(Q501, Q503, etc.)
NO
Is audio signal (L/R) sent to pins (3, 13) of IC7510 (SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
(Q506, Q505, etc.)
NO
Is audio signal (L/R) input to pins (1, 12) of IC7510 (SW)?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL signal, etc.)
(SC_AUD_SEL signal, etc.)
NO
Is audio signal (L/R) output from pins (40, 41) of IC1404
(CODEC)?
(CODEC)?
YES
Check the line between IC7510 and IC1404.
(IC1405, etc.)
(IC1405, etc.)
NO
Check IC1404 and its peripheral circuits.
The audio signal is not output (4)
No audio signal output from AUDIO_OUTPUT terminal.
TERMINAL UNIT:
Is audio signal (L/R) output from pins (2, 4) of audio output termi-
nal (J503)?
Is audio signal (L/R) output from pins (2, 4) of audio output termi-
nal (J503)?
YES
Check the connection to J503 and external devices.
NO
MONITOR_MUTE signal [pin (72) of IC506
(VIDEO_SELECTOR)] or MUTE-A_ALL signal [pin (55) of
IC2002 (UCON)] will be “H”?
(VIDEO_SELECTOR)] or MUTE-A_ALL signal [pin (55) of
IC2002 (UCON)] will be “H”?
YES
This signal should be “L”.
Check IC506, IC2002, and its peripheral circuits.
Check IC506, IC2002, and its peripheral circuits.
NO
Is the audio signal (L/R) output from pins (40, 41) of IC1404
(CODEC)?
(CODEC)?
YES
Check the line between IC1404 and J503.
(IC1405, Q509, Q510, etc.)
(IC1405, Q509, Q510, etc.)
NO
Check IC1404 and its peripheral circuits.
LC-46X8E/S/RU
4 – 8
The audio signal is not output (5)
No audio signal output from DIGITAL_AUDIO_OUTPUT terminal.
TERMINAL UNIT:
Is digital audio signal (OPT_OUT) output to pin (1) of optical fiber
transmitter (D501)?
Is digital audio signal (OPT_OUT) output to pin (1) of optical fiber
transmitter (D501)?
YES
Check D501 or peripheral circuits.
(B3.3V_LINE, etc.)
(B3.3V_LINE, etc.)
NO
SPDIF_MUTE signal [pin (92) of IC9101 (CPLD)] or MUTE-
A_ALL signal [pin (55) of IC2002 (UCON)] will be “H”?
A_ALL signal [pin (55) of IC2002 (UCON)] will be “H”?
YES
This signal should be “L”.
Check IC9101, IC2002, and its peripheral circuits.
Check IC9101, IC2002, and its peripheral circuits.
NO
Is digital audio signal (OPT_OUT) output from pin (23) of IC1404
(CODEC) to pin (2) of IC502 (AND GATE)?
(CODEC) to pin (2) of IC502 (AND GATE)?
YES
Check IC502 or peripheral circuits.
NO
Check IC1404 and its peripheral circuits.
The audio signal is not output (6)
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
When headphone is connected, does the HP_PLUG signal of the
pin (6) become “H” (about 3.3V) from “L” (0V).
When headphone is connected, does the HP_PLUG signal of the
pin (6) become “H” (about 3.3V) from “L” (0V).
NO
Check the line between J802 and IC9101.
(P801/P1101, IC9105, etc.)
(P801/P1101, IC9105, etc.)
YES
Is the audio signal (HP_L/HP_R) output to pins (2, 3) of head-
phone terminal J802?
phone terminal J802?
YES
Check HEAD-PHONE (J802) or peripheral circuits.
MAIN UNIT:
NO
Is the audio output signal (HP_LOUT/HP_ROUT) send from pins
(68, 70) of connector (SC1101) to pins (5, 7) of connector (P801/
P1101)?
(68, 70) of connector (SC1101) to pins (5, 7) of connector (P801/
P1101)?
YES
Check the line between P1101 and J802.
(P801/P1101, etc.)
(P801/P1101, etc.)
TERMINAL UNIT:
NO
Is audio output signal (HP_LOUT/HP_ROUT) sent to pins (68,
70) of connector (SC501)?
70) of connector (SC501)?
YES
Check the connector SC501/SC1101.
NO
Is audio output signal (HP_LOUT/HP_ROUT) output from pins
(36, 35) of IC1404 (CODEC)?
(36, 35) of IC1404 (CODEC)?
YES
Check the connector SC501/SC1101.
NO
Check whether the HP_MUTE signal is “H” [pin (86) of IC9101
(CPLD)].
This signal should be “L”.
(CPLD)].
This signal should be “L”.
YES
Check Q1401, Q1402 or peripheral circuits.
NO
Check IC1404 (CODEC) or peripheral circuits.
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