LC-37GA5E (serv.man6). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 2

<Power supply> 

Is the power supply cord properly connected to the Main unit? 

Replace F701 and F702, and then turn on the power. If a fuse 
still blows, replace VA702, D701 and IC701, and then check again. 

Replace F703 and then turn on the power. If a fuse still blows, 
replace D763 and IC703, and then check again. 

Are F701 and F702 normal? 

Is F703 normal? 

Reconnect the power supply cord and turn on the power. 

Are the wire harness, FFC, etc. in the set connected properly? 

Reconnect the wire harness, FFC, etc. and check again. 

Is a voltage of about 380 V applied to C709 and C710 when 
power is turned on? 

Check the 380V system power supply circuit. (L703, IC701, 
Q701~5, D705, TH701) 

Is thermal fuse (F704) normal? (117°C specification)

After replacing F704 and rechecking the mounting of D701, 
D705, Q701, Q702, Q710 and Q711, supply power again. If the 
fuse burns out again, replace the said parts and recheck.

Is voltage generated at the +13V line (pin 1 of CN706) 
immediately after supplying power?

Check the power supply circuit of the 13V system.
(T701, T702, F704, Q706-14, PC701, PC703-4, D708-17, 
IC702, L710, Q733-6, D735-6, D771, IC706)
Is "H" signal sent to the PS_ON (pin 5 of CN707) line?

Is +3.3V line (pins 11/12 of CN706) normal immediately after 
supplying power?
Is F1001 (2.5A) of the Main PWB normal?

Check the power supply circuit of the +3.3V line system.
(IC715, L715, T703, IC703, PC701-702) (F1001)

Is each REG-IC output normal?
(IC708 (4V), IC740 (33V), IC709 (5V), IC713 (12V), Q760 (6V))

Check each REG-IC and each line.