60PJ101C-WA, 60PJ102C-WA, 60PJ103C-WA, 60PJ104C-WA (CHASSIS:PC01A) - LG TV Service Manual (repair manual). Page 66

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Customer Oriented R&D
Breakthrough
12. USB Trouble Shooting(SVC only)
• Exception  
- USB power could be disabled by inrushing current
- In this case, remove the device and try to reboot the Monitor (AC power off/on)
Check USB 2.0 Cable
Y
Check JK800
N
Y
Y
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level 
IC800
N
Replace IC800 & Recheck
Y
MaybeMstar S7 (IC101)
has problems. Replace It.
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