32LV3400-SA (CHASSIS:LJ01U) - LG TV Service Manual (repair manual). Page 48

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9. Digital TV Audio
Check RF Cable & Signal
Follow procedure 
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.2V Power 
IC3703  2 pin : 1.2V
Check IF_P/N Signal
TU3702  17/18 Pin
Replace IC3703 
Check Tuner 5V Power
L3702
Check IC406,IC410
ok
ok
ok
ok
No
No
No
No
Replace IC406,IC410
No
Bad Tuner. Replace Tuner.
Replace L3702
ok
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