Sharp LC-37D44U - Troubleshooting HDMI Audio Input Issues

LC-37D44U
6 – 12
No audio (4)
INPUT-4 No audio (HDMI connected)
INPUT-5 No audio (HDMI connected)
[INPUT-4 input]
Is INPUT-4 selected on the input select menu screen?
[INPUT-5 input]
Is INPUT-5 selected on the input select menu screen?
YES
NO
Is the audio output selected for “VARIABLE” on the
menu screen?
Set the audio output to “FIXED”.
[INPUT-4 input] If no video appears, refer to “No external input video
(HDMI) [INPUT-4]”.
[INPUT-5 input] If no video appears, refer to “No external input video
(HDMI) [INPUT-5]”.
YES
Is the HDMI_MUTE line as specified?
YES
NO
Check Q1301, IC1302 and their peripheral circuits.
Does the audio signal come from pins(AN28)(SPOUT_LP),
(AN29)(SPOUT_RN), (AP28)(SPOUT_LN), and (AP29)(SPOUT_RP)
of IC8001 to pins(5)(SP_LP),(6)(SP_LN), (8)(SP_RN), and (9)(SP_RP)
of IC2701(AMP)?
NO
Check the line between IC8001 and IC2701, and their
peripheral circuits. (AMP_MUTE line, etc.)
YES
Is the audio output from IC2701 as specified? NO Check IC2701 and its peripheral circuits.
YES
Check the connector(P2701), speakers and their peripheral circuits.