Sharp Aquos LC-37D44U, Руководство по обслуживанию

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LC-37D44U
6 – 11
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-4/5(HDMI) audio No audio at digital broadcast signal reception
If no video appears, refer to “No external input video (HDMI)
[INPUT-4/5]”. Are there the video signal outputs (IF_OUT_P/N) at the pins(19) and (20)
of tuner(TU1101)?
YES
NO
Is the HDMI_MUTE line as specified? Check the tuner(TU1101) and its peripheral circuits.
YES
NO
Check Q1301, IC1302 and their peripheral circuits. Does the video signal outputs come from pins(19) and (20) of
tuner(TU1101) to AM33 and AM34 of IC8001?
YES
NO
Check the line between TU1101 and IC8001.
Is there the SPDIF signal (OPT_OUT) output at pin(AP11) of IC8001(CPU)?
YES
NO
Check the IC8001 and its peripheral circuits.
Is there the SPDIF signal (OPT_OUT) input at pin(2) of IC1304
(SPDIF_BUFF & MUTE)? NO Check the line between IC8001 and IC1304.
YES
Is there the MUTE signal input at pin(1) of IC1304? NO Check the MUTE_A_ALL and ACDET signals, and their
peripheral circuits. (Q1304, Q1312, D1310, etc.)
YES
Is there the SPDIF signal input at pin(1) of D1306(OPTICAL OUTPUT)? NO Check D1306 and its peripheral circuits.
YES
No optical output under the following conditions as per
HDMI requirements.
*Audio contents protected.
*Audio frequency beyond 48kHz.
*Audio bit length beyond 16bits.
Check the speakers and their peripheral circuits.