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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 22

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22
37GQ-20H
TROUBLESHOOTING TABLES.
NO PICTURE
NO
Check Q1001, 
IC1001, IC1003
Check the tuner supply 
and band biases. Both
 must be approx. 5V DC
Normal
YES
Is tuning voltage 
normal at  
Pin (2) of Tuner? 
Check Picture 
setting by R/C. Signal 
should be received.
-Check the AGC Voltage:
 Pin (1) of Tuner.
-Check the SAW Filter: SF201
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