Sharp LC32SB27U Service Manual - Page 61

Check the MUTE_A_ALL and AC_DET signals

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Page 61 highlights

LC-32D47U/LC-32SB27U/LC-C3237U No audio signal at Digital Audio Output terminal (Analog sound heard) No INPUT-5/6/7 (HDMI) audio. No audio at digital broadcast signal reception. If no video appears, refer to "No external input video (HDMI) [INPUT-5/6/7]". If no video appears, refer to "No video at digital broadcast signal reception". Is there the SPDIF signal output (OPT_OUT) at pin (J3) of IC8001 (CPU)? NO Check the IC8001 and its peripheral circuits. YES Is there the SPDIF signal (OPT_OUT) input at pin (2) of IC1304 (SPDIF-BUFF & MUTE)? YES Is there the MUTE signal input at pin (1) of IC1304? (usual: High, Mute: Low) YES Is there the SPDIF signal input at pin (1) of D1306 (OPTICAL OUTPUT)? YES Check the speakers and the optical cable. NO Check the line between IC8001 and IC1304. NO Check the MUTE_A_ALL and AC_DET signals, and their peripheral circuits (Q1304, D1310, etc). NO Check D1306 and its peripheral circuits. No optical output under the following conditions as per HDMI requirements. * Audio contents protected. * Audio frequency beyond 48kHz. * Audio bit length beyond 16bits. 6 - 11

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LC-32D47U/LC-32SB27U/LC-C3237U
6 – 11
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-5/6/7 (HDMI) audio.
No audio at digital broadcast signal reception.
If no video appears, refer to “No external input video (HDMI)
[INPUT-5/6/7]”.
If no video appears, refer to “No video at digital broadcast signal reception”.
Is there the SPDIF signal output (OPT_OUT) at pin (J3) of IC8001 (CPU)?
NO
Check the IC8001 and its peripheral circuits.
YES
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? (usual: High, Mute: Low)
NO
Check the MUTE_A_ALL and AC_DET signals,
and their peripheral circuits (Q1304, D1310,
etc).
YES
Is there the SPDIF signal input at pin (1) of D1306 (OPTICAL OUTPUT)?
NO
Check D1306 and its peripheral circuits.
No optical output under the following conditions
as per HDMI requirements.
*
Audio contents protected.
*
Audio frequency beyond 48kHz.
*
Audio bit length beyond 16bits.
YES
Check the speakers and the optical cable.