Sharp LC-32X20E (serv.man4) Service Manual ▷ View online
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 5
No sound from external input devices (4)
Does not the sound of the audio signal input to EXT6 (Analog) go
out?
out?
Does not the sound of the audio signal input to EXT7 go out?
MAIN UnIT:
Whether “Analog” has selected it in the Audio setup of the HDMI
option is checked.
option is checked.
MAIN UNIT:
YES
Is audio signal sent from pin (2/L) and (3/R) of input terminal
J1502 to pin (1) and (6) of IC1504 (SW)?
J1502 to pin (1) and (6) of IC1504 (SW)?
YES
Is audio signal sent from pin (2/L) and (3/R) of input terminal
J1501 to pin (3) and (7) of IC1504 (SW)?
J1501 to pin (3) and (7) of IC1504 (SW)?
NO
NO
Check the connection between J1502 and the peripheral circuit,
the external input devices.
the external input devices.
Check the connection between J1501 and the peripheral circuit,
the external input devices.
the external input devices.
Is audio signal output from pin (15/HDMI_PC_L) and pin (11/HDMI_PC_R) of IC1504 to pin (44) and (46) 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 (44) and (46) of SC501?
sent to pins (44) and (46) of SC501?
NO
Check the connector (SC1101/SC501)
YES
Is audio signal input to pin (59/MAIN_L) and (60/MAIN_R) 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)
Does not the sound of the audio signal input to EXT8 go out?
TEREMINAL UNIT:
Is audio signal sent from pins (2/IN4-L) and (4/IN4-R) of input ter-
minal J502?
Is audio signal sent from pins (2/IN4-L) and (4/IN4-R) of input ter-
minal J502?
NO
Check the connection to J502 and external devices.
YES
Is audio signal sent from pins (57/IN4-L) and (58/IN4-R) of
IC1404?
IC1404?
NO
Check the line between J502 and IC1404.
YES
Refer to “No sound output in all modes”.
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 6
The audio signal is not output (1)
The audio signal of UHF/VHF and DTV is not output from EXT1 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1
(SC502)?
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1
(SC502)?
YES
Check the connection to SCART1 and external devices.
NO
Is S-MUTE-LINE [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S-MUTE_LINE.
(Q502, Q504, etc.)
(Q502, Q504, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
(SOUND 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 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
(Q501, Q503, etc.)
NO
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510
(SW)?
(SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
(Q506, Q505, etc.)
NO
Is audio signal input to pins (2/L-ch) and (15/R-ch) of IC7510?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
(SC_AUD_SEL_LINE, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
(SOUND MULTIPLEX DECODER)?
YES
Check the line between IC7510 and IC1402.
(IC1407, etc.)
(IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 7
The audio signal is not output (3)
The audio signal of MONITOR is not output from EXT2 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
(Q501, Q503, etc.)
NO
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510
(SW)?
(SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
(Q506, Q505, etc.)
NO
Is audio signal input to pins (1/L-ch) and (12/R-ch) of IC7510?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
(SC_AUD_SEL_LINE, etc.)
NO
Is audio signal sent to pins (40/L-ch) and (41/R-ch) 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.
TEREMINAL UNIT:
Is audio signal output to pin (2/L-ch), (4/R-ch) of audio output ter-
minal J503?
Is audio signal output to pin (2/L-ch), (4/R-ch) of audio output ter-
minal J503?
YES
Check the connection to J503 and external devices.
NO
Do pin (72)] of MONITOR_MUTE_LINE [IC506
(VIDEO_SELECTOR), pin (55)] of MUTE-A_ALL_LINE
[MAIN_UNIT IC2002 (UCON) become H?
(VIDEO_SELECTOR), pin (55)] of MUTE-A_ALL_LINE
[MAIN_UNIT IC2002 (UCON) become H?
YES
Check the IC506,IC2002, its peripheral circuit and
MONITOR_MUTE_LINE, MUTE-A_ALL_LINE.
(Q512, Q511, D551, etc.)
MONITOR_MUTE_LINE, MUTE-A_ALL_LINE.
(Q512, Q511, D551, etc.)
NO
Is the audio signal output of pins (40/L-ch) and (41/R-ch) of
IC1404 (CODEC)?
IC1404 (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-32X20E/S/RU, LC-37X20E/S/RU
4 – 8
The audio signal is not output (5)
No audio signal output from DIGITAL_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:
Is audio signal output to pin (1) of digital sound output terminal
D501?
Is audio signal output to pin (1) of digital sound output terminal
D501?
YES
Check D501 or peripheral circuits.
(B3.3V_LINE, etc.)
(B3.3V_LINE, etc.)
NO
Do pin (92) of SPDIF_MUTE_LINE [MAIN_UNIT IC9101
(CPLD)], pin (55) of MUTE-A_ALL_LINE [MAIN_UNIT IC2002
(UCON)] become H?
(CPLD)], pin (55) of MUTE-A_ALL_LINE [MAIN_UNIT IC2002
(UCON)] become H?
YES
Check IC9101, IC2002, its circumference circuit and
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.
(Q521, D521, etc.)
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.
(Q521, D521, etc.)
NO
Is an audio signal input from pin (23) of IC1404 (CODEC) to pin
(2) of IC502, and is the logic signal input into pin (1)?
(2) of IC502, and is the logic signal input into pin (1)?
YES
Check IC502 or peripheral circuits.
NO
Check IC1404 and its peripheral circuits.
The audio signal is not output (6)
No sound from HEDPHONE_OUTPUT terminal.
MINI AV_UNIT:
Is the HP_PLUG signal input into pin (87) of MAIN_UNIT’s
IC9101 (CPLD) from pin (6) of a headphone terminal (J802)?
Is the HP_PLUG signal input into pin (87) of MAIN_UNIT’s
IC9101 (CPLD) from pin (6) of a headphone terminal (J802)?
NO
Check the line between J802 and IC9101.
(P801/P1101, IC9105, etc.)
(P801/P1101, IC9105, etc.)
YES
Is the audio signal output to pin (2)/L pin (3)/R of headphone ter-
minal J802?
minal J802?
YES
Check HEAD-PHONE (J802) or peripheral circuits.
MAIN UNIT:
NO
Is the audio signal input into pin (5) and (7)of connector P1101
from pin (48)/L, (50)/R of connector SC1101?
from pin (48)/L, (50)/R of connector SC1101?
YES
Check the line between P1101 and J802.
(P801/P1101, etc.)
(P801/P1101, etc.)
TERMINAL UNIT:
NO
Is audio signal sent to pins (48/L-ch), (50/R-ch) of SC501?
YES
Check the connector SC501/SC1101.
NO
Is audio signal sent to pins (36/L-ch), (35/R-ch) of IC1404
(CODEC)?
(CODEC)?
YES
Check pin (86) of MUTE circuit HP_MUTE_LINE [MAIN_UNIT
IC9101 (CPLD) pin (86)] becomes H or not.
(Q1402, Q1401, IC9101, etc.)
IC9101 (CPLD) pin (86)] becomes H or not.
(Q1402, Q1401, IC9101, etc.)
NO
Check IC1404 or peripheral circuits.
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