Double Usb Function - LG CM4550 Service Manual

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

2. DOUBLE USB FUNCTION

USB FUNCTION
YES
Plug-in usb device.
YES
Display "NO USB".
YES
Display "READ".
YES
Display "NO FILE".
YES
Check usb audio fi le in usb device
(MP3, WMA fi le is playable)
NO
Check USB_5V.
YES
Check USB_D+/D-
(R380,R381/
R382,R383).
YES
Check IC501
(Pin U7,U8/ A7,A8).
3-28
NO
Check CN302.
NO
Check USB jack (JK301/ JK302).
NO
Replace IC501.