LG CM4520 - Double Usb Function

USB FUNCTION
Check USB_5V.
Display “NO USB”.
YES
YES
Check USB_D+/D-
(R501,R502).
YES
Plug-in usb device.
Check CN502.
NONO
YES
Display “READ”.
YES
Display “NO FILE”.
YES
Check usb jack (JK501/ JK502).
NO
Replace IC801.
NO
Check IC801(Pin116, 117).
Check usb audio fi le in usb device
(MP3, WMA fi le is playable)
YES
2. DOUBLE USB FUNCTION
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CDP ELECTRICAL TROUBLESHOOTIHG GUIDE