Sharp LC-60E77UN Service Manual page 61

No INPUT-5/6/7/8 (HDMI) audio.
If no video appears, refer to "No external input video (HDMI)
[INPUT-5/6/7/8]".
Is there the SPDIF signal output (OPT_OUT) at pin (J28) of IC8001 (CPU)?
YES
Is there the SPDIF signal (OPT_OUT) input at pin (1) of IC1304 (SPDIF BUFFER)?
YES
Is there the MUTE signal input at pin (7) of IC1304? (usual: High, Mute: Low)
YES
Is there the SPDIF signal input at pin (1) of D1306 (OPTICAL OUTPUT)?
YES
Check the speakers and the optical cable.
Is the audio output from the monitor set at "VARIABLE" or "FIXED" on the menu screen?
YES
Are there the audio signal outputs at pins (N27) (PGA1OUT_L) and (N28) (PGA1OUT_R) of IC8001 (CPU)?
YES
Does the audio signal come from pins (N27) (PGA1OUT_L) and (N28) (PGA1OUT_R) of IC8001 to pins (2) (L) and (4) (R) of J505?
YES
Check the connector (J505) and their peripheral circuits, and speakers and the Cable.
No audio signal at Digital Audio Output terminal (Analog sound heard)
No monitor audio output
Check IC8001 (CPU) and its peripheral circuits.
Check IC8001 (CPU) and its peripheral circuits.
Check the line between IC8001 and J505 and their peripheral circuits.
Check the LINE_MUTE line and its peripheral circuits (Q1311, etc.).
LC-60E77UN/LC-65E77UM/LC-C6077UN/LC-C6577UM
No audio at digital broadcast signal reception.
If no video appears, refer to "No video at digital broadcast signal
reception".
NO
Check the IC8001 and its peripheral circuits.
NO
Check the line between IC8001 and IC1304.
NO
Check the MUTE_A_ALL and AC_DET signals, and their peripheral circuits
(Q1304, D1301, D1310, etc.).
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.
NO
NO
NO
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