Read LG 42LV3700-UD (CHASSIS:LA12B) Service Manual online
16. Trouble shooting - USB connection error
Check USB 2.0 Cable
N
Check USB jack
(JK1201 or JK1202)
Y
N
N
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level at Bead or Jack
Y
Replace one of
IC1203 or IC1204 and then check
N
Maybe LGE35230(IC101)
has problems. Replace It.
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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