Sharp LC-32XL8E/S/RU Service Manual page 55

No audio signal output from DIGITAL_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:
Is audio signal output to pin (1) of digital sound output terminal
D501?
Do pin (92) of SPDIF_MUTE_LINE [MAIN_UNIT IC9101(CPLD)],
pin (55) of MUTE-A_ALL_LINE [MAIN_UNIT IC2002(UCON)]
become H?
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)?
Check IC1404 and its peripheral circuits.
No sound from HEADPHONE_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 audio signal output to pin (2)/L pin (3)/R of headphone ter-
minal J802?
MAIN UNIT:
Is the audio signal input into pin (5) and (7)of connector P1101
from pin (48)/L, (50)/R of connector SC1101?
TERMINAL UNIT:
Is audio signal sent to pins (48/L-ch), (50/R-ch) of SC501?
Is audio signal sent to pins (36/L-ch), (35/R-ch) of IC1404
(CODEC)?
Check IC1404 or peripheral circuits.
The audio signal is not output (5)
NO
NO
NO
The audio signal is not output (6)
YES
NO
NO
NO
NO
LC-32XL8E/S/RU, LC-37XL8E/S/RU
YES Check D501 or peripheral circuits.
(B3.3V_LINE, etc.)
YES Check IC9101, IC2002, its circumference circuit and
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.
(Q521, D521, etc.)
YES Check IC502 or peripheral circuits.
NO Check the line between J802 and IC9101.
(P801/P1101, IC9105, etc.)
YES Check HEAD-PHONE (J802) or peripheral circuits.
YES Check the line between P1101 and J802.
(P801/P1101, etc.)
YES Check the connector SC501/SC1101.
YES Check pin (86) of MUTE circuit HP_MUTE_LINE [MAIN_UNIT
IC9101 (CPLD) pin (86)] becomes H or not.
(Q1402, Q1401, IC9101, etc.)
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