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50PV400-UB, 50PV430-UC, 50PV450-UA, 50PV450C-UA (CHASSIS:PU14K) - LG TV Service Manual (repair manual). Page 46

Read LG 50PV400-UB / 50PV430-UC / 50PV450-UA / 50PV450C-UA (CHASSIS:PU14K) Service Manual online

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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