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19LV2500-UA (CHASSIS:LA01T) - LG TV Service Manual (repair manual). Page 41

Read LG 19LV2500-UA (CHASSIS:LA01T) Service Manual online

2. Digital TV Video
Check RF Cable & Signal
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 IC7952, IC7861
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC7952, IC7861
No
Bad Tuner. Replace Tuner.
Replace L3702
ok
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