Sharp LC-37D64U Service Manual page 56

LC-32/37D64U
Is the audio output from the monitor set at "VARIABLE" or
"FIXED" on the menu screen?
Are there the audio signal outputs at pins(24)(LINE_L) and
(25)(LINE_R) of IC1403(CODEC)?
Does the audio signal come from pins(24)(LINE_L) and
(25)(LINE_R) of IC1403 to pins(47) and (49) of SC2203 on the
MAIN unit?
Are there the audio signal inputs at pins(47)(LINE_L) and
(49)(LINE_R) of SC501 on the TERMINAL unit?
Does the audio come from pins(47)(LINE_L) and (49)(LINE_R)
of SC501 to pins(4)(L) and (2)(R) of J505?
No monitor audio output
YES
YES
YES
YES
NO Check the bus line(SCL0/SDA0) and IC1403.
NO Check IC1403 and its peripheral circuits.
Check the line between IC1403 and SC2203.
NO
NO Check the line between SC501 and SC2203 connectors.
NO Check the line between J505 and SC501, and their peripheral
circuits.
Check the LINE_MUTE line and its peripheral circuits.(Q507 thru
Q509, etc.)
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