50PT330-UB, 50PT350-UD, 50PT350C-UD (CHASSIS:PU14K) - LG TV Service Manual (repair manual). Page 46

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Check video output
Follow procedure All source audio trouble 
shooting  
Y
Follow procedure digital TV video 
trouble shooting
N
N
Replace Mstar IC (IC1)
Digital TV Audio
Trouble Shooting Guide
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