Sharp LC-65D64U Service Manual page 51

No INPUT-4/5/6(HDMI) audio
If no video appears, refer to "No external input video (HDMI)
[INPUT-4/5/6]".
Is the HDMI_MUTE line as specified?
Check Q1301, IC1302 and their peripheral circuits.
YES
Does the HDMI_SPDIF signal come from pin (78) of
IC1502(HDMI-Rx) to pins(AM11) and (AN11) of IC8001(CPU)?
Check the line between IC1502 and IC8001, and
their peripheral circuits.
YES
Is there the SPDIF signal (OPT_OUT) output at pin(AP11) of IC8001(CPU)?
Is there the SPDIF signal (OPT_OUT) input at pin(2) of
IC1304(SPDIF_BUFF&MUTE)?
Is there the MUTE signal input at pin(1) of IC1304?
Is there the SPDIF signal input at pin(1) of D1306(OPTICAL OUT-
PUT)?
Check the speakers and their peripheral circuits.
No audio signal at Digital Audio Output terminal (Analog sound heard)
NO
NO
YES
YES
YES
YES
No audio at digital broadcast signal reception
Are there the video signal outputs (IF_OUT_P/N) at the pins(19) and
(20) of tuner(TU1101) on the TERMINAL unit?
Check the tuner(TU1101) and its peripheral circuits.
YES
Are there the video signal outputs (IF_OUT_P/N) at the pins(19) and
(20) of tuner(TU1101) on the TERMINAL unit?
Check the tuner(TU1101) and its peripheral circuits.
YES
Are there the video signal outputs at pins(70) and (72) of connec-
tor(SC501) on the TERMINAL unit?
Check the line between TU1101 and SC501.
YES
Are there the video signal inputs at pins(70) and (72) of connec-
tor(SC2203) on the MAIN unit?
Check the line between SC2203 and SC501 connec-
tors.
YES
Are there the video signal inputs at pin(AM33) and (AM34) of
IC8001(CPU)?
Check the line between IC8001 and SC2203 (L2204,
C2229, etc.).
YES
Check the IC8001 and its peripheral circuits.
NO Check the line between IC8001 and IC1304.
NO Check the MUTE_A_ALL and ACDET signals, and their peripheral
circuits(Q1304, Q1312, D1310, etc.).
NO Check D1306 and its peripheral circuits.
No optical output under the following conditions as per HDMI require-
ments.
*Audio contents protected.
*Audio frequency beyond 48kHz.
*Audio bit length beyond 16bits.
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LC-65D64U
NO
NO
NO
NO
NO
NO