Sharp 37GQ-20S Service Manual page 24

37GQ-20S
37GQ-21S
NO
Check D707, C710
Check IC1001, Q305
NO SOUND
Check Sound setting by
R/C. Signal should be
received.
Does
approx. 20V DC
appear on
C710?
NO
Check IC801, C301
YES
YES
Does
Sound Signal
appear at Pin(6)
of IC801?
YES
Is
Audio Amplifier
muted?
NO
Check R304, Q301, Q302
24