LC-40E67U/LC-40E77U
6 – 13
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-5/6/7/8(HDMI) audio. No audio at digital broadcast signal reception.
If no video appears, refer to “No external input video (HDMI)
[INPUT-5/6/7/8]”.
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 (1) of IC1307 (SPDIF SELEC-
TOR)?
NO Check the line between IC8001 and IC1307.
YES
Is there the MUTE signal input at pin (7) of IC1307? (usual: Low, Mute: High)
Is there the SELECT signal input at pin (6) of IC1307? (High)
NO Check the MUTE_A_ALL and AC_DET signals,
and their peripheral circuits (Q1304, D1310,
etc).
Check the SEL_SPDIF signals/IC8001, and
their peripheral circuits.
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.
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