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LGE Internal Use Only
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Only for training and service purposes
4. TROUBLE SHOOTING
4. Trouble Shooting (BB)
USB Initial sequence of GD880 is :
USB connected to GD880
Æ
VCHG_VBUS(FL400) go to 5V
Æ
VERG_MSME_1.8V is about 1.8V
Æ
USB_CLK is OK(R210)->USB work
4.12 USB trouble
Start
VCHG_VBUS is about
to 5V?
TP4 CLK is OK?
Change the Main board
Check TP2
Check TP3
NO
YES
YES
NO
Cable is insert?
YES
Cable insert
NO
YES
NO
TP5,TP6 signal is out?
Check TP1
130 P