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37GQ-20 (serv.man3). (including circuit diagram and parts listing) for the version 02 chassis - Sharp TV Service Manual (repair manual). Page 23

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23
37GQ-20H
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?
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