Read LG 42LB7DF (CHASSIS:LJ81A) Service Manual online
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Check USB 2.0 Cable
Check L205 voltage level 5V
Y
N
Replace it or IC202
Check P201
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)
TROUBLESHOOTING
14. USB
14-2. Troubleshooting
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