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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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