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19LV2500-UG (CHASSIS:LA01R) - LG TV Service Manual (repair manual). Page 43

Read LG 19LV2500-UG (CHASSIS:LA01R) Service Manual online

Trouble shooting guide
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 1.8V Power 
IC3703  2 pin : 1.8V
Check IF_P/N Signal
TU3700  10/11 Pin
Replace IC3703 
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
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