Sharp LC-37D64U Service Manual page 54

LC-32/37D64U
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?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
YES
[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]".
Is the HDMI_MUTE line as specified?
Check Q1301, IC1302 and their peripheral circuits.
YES
Does the audio signal come from pins(4)(COD_LRCK), (5)(COD_BCK) and
(6)(COD_SDOUT) of IC1403 to pins(AK24), (AH24) and (AJ24) of
IC8001(CPU)?
Does the audio signal come from pins(AJ25)(DSP_LRCK),
(AK25)(DSP_BCKIN), (AL25)(DSP_SDIN1) and (L32)(DSP_SDIN2) of
IC8001 to pins(2), (3), (6) and (4) of IC1402(SOUND_DSP)?
Does the audio signal come from pins(19)(DSP_SDOUT1) and
(21)(DSP_SDOUT3) of IC1402 to pins(11) and (12) of IC1403(CODEC)?
Does the audio signal come from pins(AJ25)(DSP_LRCK),
(AK25)(DSP_BCKIN) and (AL24)(DSP_MCLK) of IC8001 to pins(8), (9) and
(10) of IC1403?
Does the audio signal come from pins(17)(SPOUT_LP) and
(18)(SPOUT_RP) of IC1403 to pins(39)(SP_LP) and (43)(SP_RP) of connec-
tor(SC2203) on the MAIN unit?
Are there the audio signal inputs at pins(39)(SP_LP) and (43)(SP_RP) of
connector(SC501) on the TERMINAL unit?
Does the audio signal come from pins(39)(SP_LP) and (43)(SP_RP) of
SC501 to pins(5)(SP_LP) and (9)(SP_RP) of IC2701(AMP) on the TERMI-
NAL unit?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
No audio (4)
NO
YES
NO
YES
YES
YES
YES
YES
YES
YES
6 – 11
Check the line between IC1403 and IC8001.
NO
Check the line between IC8001 and IC1402.
NO
NO Check the line between IC1402 and IC1403.
Check the line between IC8001 and IC1403.
NO
Check the line between SC2203 and IC1403.(D1305,
NO
D1312, Q1306 and Q1307, etc.)
NO Check the line between SC501 and SC2203.
Check the line between SC501 and IC2701, and their
NO
peripheral circuits.(AMP_MUTE line, etc.)
NO Check IC2701 and its peripheral circuits.