Read Sharp LC-42X20E (serv.man4) Service Manual online
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/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 (68)/L, (70)/R of connector SC1101?
from pin (68)/L, (70)/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 (68/L-ch), (70/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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