LG 55G2 Service Manual page 79

13. Trouble shooting - USB connection error
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
N
Check USB jack
(JK4300 or JK4302 or JK4303)
N
Check 5V voltage level at Bead or Jack
N
Maybe IC4200(USB1/2) or IC100(USB1/2/3)
has problems. Replace It.
• 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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Only for training and service purposes
Y
Replace Jack
Replace one of
Y
IC4303(USB1) or IC4306(USB2/3) and then check
LGE Internal Use Only