LC-46/52E77U
6 – 14
No audio signal at Digital Audio Output terminal (Analog sound heard)
No INPUT-5/6/7/8/9 (HDMI) audio.
No audio at digital broadcast signal reception.
If no video appears, refer to “No external input video (HDMI)
[INPUT-5/6/7/8/9]”.
If no video appears, refer to “No video at digital broadcast signal
reception”.
Is there the SPDIF signal output (OPT_OUT) at pin (J28) of IC8001 (CPU)?
YES
NO
Check the IC8001 and its peripheral circuits.
Is there the SPDIF signal (OPT_OUT) input at pin (2) of IC1303 (SPDIF SELECTOR)?
YES
NO
Check the line between IC8001 and IC1303.
Is there the SELECT signal input at pin (6) of IC1303? (High)
YES
NO
Check IC1301, and it peripheral circuits.
Is there the MUTE signal input at pin (7) of IC1303? (usual: Low, Mute: High)
YES
NO
Check the MUTE_A_ALL and AC_DET signals, and their peripheral circuits
(Q1304, D1301, D1310, etc.).
Is there the SPDIF signal input at pin (1) of D1306 (OPTICAL OUTPUT)?
YES
NO
Check the speakers and the optical cable.
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.
Summary of Contents for AQUOS LC-52E77U
Page 90: ...LC 46 52E77U 9 20 MEMO ...
