42PB4D-AA (CHASSIS:PB73B) - LG TV Service Manual (repair manual). Page 14

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Check Antenna Cable
Check  Tuner
5V, Video out
Check X260 inputs
M_TU_CVBS(C2117)
Check CVBS Video Path
1 : _Check Tuners 
Vcc
 and Video out
1. Video
(4)RF Mode
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