Sharp LC-60LE920UN Service Manual page 57

LC-52LE920UN/LC-60LE920UN
I No audio si_lnal at Di_lital Audio Output terminal IAnalo_l sound heard I I
I No INPUT-4151617 IHDMI) audio. I
If no video appears, refer to "No external input video (HDMI)
[IN PUT-4/5/6/7]".
I No audio at di_lital broadcast si_lnal reception. I
If no video appears, refer to "No video at digital broadcast signal
reception".
I Is there the SPDIF signal output (OPT_OUT) at pin (J28) of IC3302 (CPU)?
_' NO
I Check the IC3302 and its peripheral circuits.
YES
I Is there the SPDIF signal (OPT_OUT) input at pin (2) of IC503 (SPDIF BUFFER & SPDIF-MUTE)? I
_' NO
I Check the line between IC3302 and IC503.
YES
I Is there the MUTE signal input at pin (7) of IC503? (usual: High, Mute: Low) I
_' NO
Check the MUTE A ALL and SPDIF-MUTE signals, and their peripheral cir-
cuits (Q505, D530, etc.).
YES
I Is there the SPDIF signal input at pin (1) of D520 (OPTICAL OUTPUT)? I
_' YES
[ Check the speakers and the optical cable. I
_' NO
Check D520 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.
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