Sharp C6400U Service Manual page 135

[INPUT-1 input]
Is INPUT-1 selected on the input select menu screen?
[INPUT-2 input]
Is INPUT-2 selected on the input select menu screen?
[INPUT-3 input]
Is INPUT-3 selected on the input select menu screen?
[INPUT-4 input]
Is INPUT-4 selected on the input select menu screen?
YES
[INPUT-1 input]
If no video appears, refer to "No external input video (HDMI) [INPUT-1]".
[INPUT-2 input]
If no video appears, refer to "No external input video (HDMI) [INPUT-2]".
[INPUT-3 input]
If no video appears, refer to "No external input video (HDMI) [INPUT-3]".
[INPUT-4 input]
If no video appears, refer to "No external input video (HDMI) [INPUT-4]".
Is the audio output selected for "VARIABLE" on the menu screen?
YES
Does the digital audio signal come from pins (Y32/Y31/Y30/V27) (CPU_AOMCLK/AOBCK/AOLRCK/AOSDATA0) of IC3303 (CPU) to pins (5/7/8/6)
(AMP_MCLK/BCLK/LRCLK/DATA_LR) of IC2703 (AMP for L/R)?
YES
Is the audio output from IC2703 as specified?
YES
Check the connector (P2701) L/R speakers and their peripheral
circuits.
LC-52/60/70LE640U/C6400U,LC-80LE633U/844U (1st Edition)
No audio (4)
INPUT-1 No audio (HDMI connected)
INPUT-2 No audio (HDMI connected)
INPUT-3 No audio (HDMI connected)
INPUT-4 No audio (HDMI connected)
NO
Refer to ": No external input video [INPUT-1/2/3/4]".
NO
Set the audio output to "FIXED".
NO
Check the line between IC3303 and IC2703 and their peripheral circuits.
NO Check IC2703 and their peripheral circuits.
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