Ubs Trouble - LG KP270 Service Manual

4.4 UBS Trouble

Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Start Start
Cable is insert? Cable is insert?
YES YES
USB_VCHG(C242) is USB_VCHG(C242) is
about to 5V? about to 5V?
Click TP1 Click TP1
YES YES
OVP_VUSB(C245) is OVP_VUSB(C245) is
about to 5V? about to 5V?
Click TP2 Click TP2
YES YES
VDD_CHARGE(C202) is VDD_CHARGE(C202) is
about to 4.8V? about to 4.8V?
Click TP3 Click TP3
YES YES
USB function is ok? USB function is ok?
END END
4. TROUBLE SHOOTING
NO NO
Cable insert Cable insert
NO
Change cable Change cable
NO
Check soldering or Check soldering or
change U203 change U203
NO
Check soldering or Check soldering or
change D202 change D202
NO
Change U202 or Change U202 or
main board main board
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