Read LG 50PV400-UB / 50PV430-UC / 50PV450-UA (CHASSIS:PU14K) Service Manual online
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Check USB 2.0 Cable for damage or open
conductors
Check L703 voltage level 5V
Y
N
Replace L703
Check JK702
Replace JK702
Y
N
Replace Mstar IC
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)
Check IC701
N
Replace IC701
Y
USB Audio
Trouble Shooting Guide
