Sharp 37GQ-20FP Service Manual page 23

37GQ-20FP
NO SOUND
Check Sound setting by
R/C. Signal should be
received.
Does
approx. 20V DC
NO YES
appear on
C710?
Check D707, C710
Does
Sound Signal
NO
appear at Pin(6)
of IC801?
Check IC801, C301
YES
Is
YES Audio Amplifier
muted?
NO
Check IC1001, Q305 Check R304, Q301, Q302
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