Sharp 37GQ-20S - No Sound Troubleshooting

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