LC-40D68UT
6 – 13
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 recep-
tion”.
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
BUFFER)?
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, AC_DET,
OPU_MUTE, HDMI_MUTE signals, and their
peripheral circuits. (Q1304, Q1312, D1310,
D1314, etc.)
YES
Is there the SPDIF signal input at pin (1) of D507 (OPTICAL OUTPUT)?
NO
Check the line between IC1304 and D507.
1) IC1304: pin (4) (OPT_OUT_TO_TERM)
2) SC1101/SC1201: pin (1)
3) D507: pin (1)
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 the optical cable.
