3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
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Check Battery connector and +VPWR line filter
(CN9100,FL9100)
Press PWR Key R4105(TP1) high to low?
Battery voltage higher than 3.4V?
Check PM8226’s VREG level?
CLOCK Check1 (TP2 : X4100?)
CLOCK Check1 (TP3 : R4110?)
PON_RESET_N (TP4 :TP4103) high?
PS_HOLD (TP5 :R4104) high?
Check KEY (S/W9711)
Change or charging the Battery
Check U4100 (PM8226)
X4100 PIN Check
Check U4100 (PM8226)
Check U4100 (PM8226)
Check U4100 (PM8226)
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes