Read LG 42LH50YD (CHASSIS:LJ91C) Service Manual online
14. USB Trouble Shooting
• 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)
Check USB 2.0 Cable
Y
Check JK1403
N
Y
Y
Check USB device
If devuce is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level at L1407
N
Replace one of
L1407/IC1402 & Recheck
Y
Maybe BCM3556(IC100)
has problems. Replace It.
Click on the first or last page to see other 42LH50YD (CHASSIS:LJ91C) service manuals if exist.