50PG60D-SA (CHASSIS:PB82C) - LG TV Service Manual (repair manual). Page 39

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USB Trouble Shooting
Check USB 2.0 Cable
Check L205 voltage level 5V
Y
N
Replace it or IC202
Check JK201
Replace it
Y
N
Check USB Device
If device is 2.5 inch HDD, check power adaptor
Y
Maybe BCM3553 has problems
Y
¥ Exception  
   - USB power could be disabled by inrushing current
   - In this case, remove the device and try to reboot the TV (AC power off/on)
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