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55LV3730 (CHASSIS:LB12B) - LG TV Service Manual (repair manual). Page 75

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Power checking method
1. Check the AC220V input in the power cord.
2. Check the connected part with input from the POWER BOARD and whether the fuse is connected.
3. Check the ST-BY DC 3.5V output voltage from the POWER BOARD.
①
②
Established 
date 
Standard Repair Process Detail Technical Manual
Revised 
date 
LCD TV
Error 
symptom
Check power input voltage and ST-BY 3.5V
Content
B. Power error _No power
B-1-2
③
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