Sharp LC-40D68UT Service Manual page 61

Is the audio output from the monitor set at "VARIABLE" or
"FIXED" on the menu screen?
Are there the audio signal outputs (I2S Line) at pins (H4)
(LINE_LRCLK), (J4) (LINE_MCLK), (K3) (LINE_BCLK) and (K4)
(LINE_DATA) of IC8001 (CPU)?
Does the audio signal come from pins (H4/J4/K3/K4)
(LINE_LRCLK/LINE_MCLK/LINE_BCLK/LINE_DATA) of IC8001
to pins (4) (LRCLK), (1) (MCLK), (2) (BCLK) and (3) (DATA) of
IC1301 (Audio DAC)?
Does the audio signal come from pins (11)/(10) (LINE_OUT_L/R)
of IC1301 to pins (4) (L) and (2) (R) of J507?
Check the connector (J507) and their peripheral circuits, and
speakers and the Cable.
No monitor audio output
YES
YES
YES
YES
NO Check IC8001 (CPU) and its peripheral circuits.
NO Check IC8001 (CPU) and its peripheral circuits.
NO Check IC8001 (CPU) and each signal lines/its peripheral circuits.
NO Check the line between IC1301 and J507 and their peripheral
circuits.
1) TU1301: pin (11) (LINE_OUT_L), pin (10) (LINE_OUT_R)
2) SC501/SC601: pin (22), pin (21)
3) J507: pin (4) (L), pin (2) (R)
Check the LINE_MUTE line and its peripheral circuits (Q1310/
Q1311, etc.).
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LC-40D68UT