3. TROUBLE SHOOTING
- 105 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
USB cable is inserted??
insert cable
Yes
Yes
Yes
Yes
Yes
Change the Main PCB
Start
Check VBUS _USB_IN voltage
(4.7V~5V, TP1 : C9402?)
Change TA or uUSB Cable or Lower FPCB
No
No
No
No
No
Check -5V0_VREG_BHARGER
(TP2 : C4142?) is high?
Check U4100(PM8226)
Check U4100(PM8226)
Check Lower FPCB
Check VREG_L10 and VREG_L20
(TP3 : C2359, TP4 : C2360) is high?
USB_D_P
(TP5: FL101) is high?