Sharp LC-52LE920UN - Page 57

LC-52LE920UN/LC-60LE920UN
| No audio signal at Digital Audio Output terminal (Analog sound heard)
| No INPUT-4/5/6/7 (HDMi) audio. | 1 No audio at digital broadcast signal reception.
If no video appears, refer to “No external input video (HDMI)
[INPUT-4/5/6/7]’.
If no video appears, refer to “No video at digital broadcast signal
reception”.
4 +
| Is there the SPDIF signal output (OPT_OUT) at pin (J28) of 1C3302 (CPU)? |
v YES
¥ No
| Check the 1C3302 and its peripheral circuits.
a there the SPDIF signal (OPT_OUT) input at pin (2) of C503 (SPDIF BUFFER & SPDIF-MUTE)? __ |
¥ YES
+ No
| Check the line between 1C3302 and 1C503.
a there the MUTE signal input at pin (7) of 1C503? (usual: High, Mute: Low)
¥ YES
+ No
Check the MUTE_A_ALL and SPDIF-MUTE signals, and their peripheral cir-
cuits (Q505, D530, etc.).
| Is there the SPDIF signal input at pin (1) of D520 (OPTICAL OUTPUT)?
‘ YES
| Check the speakers and the optical cable. |
+ 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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