55LV3730 (CHASSIS:LB12B) - LG TV Service Manual (repair manual). Page 76

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Checking method when power is ON
1. Check the ST-BY DC 3.5V output voltage from Soft Touch PCB Test Point T6
2. Check the operating condition of the power KEY on the Soft Touch PCB (Test Point P4, T5)
3. Check the AC-DET (AC) DC3.5V voltage on POWER BOARD.
4. Check the POWER ON High (About DC 1.8V or above) voltage with input from POWER BOARD.
Established 
date 
Standard Repair Process Detail Technical Manual
Revised 
date 
LCD TV
Error 
symptom
Checking method when power is ON
Content
B. Power error _
No power 
B-1-3
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