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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
4.10 Power ON Troubleshooting
Power On sequence of LG-E900 is :
Power key press
Æ
KPD_PWR_N(VA804) go to low
Æ
PM7540 Power Up
Æ
MSMC1_MODEM_1.23V(C416), MSMC2_APC_1.23V(C417), VREG_MSME_1.8V(C433),
VREG_MSMP_2.6V(C430), VREG_MSMA_2.6V(C429), VREG_TCXO_2.85V(C427)
Æ
power ON
Æ
Phone booting and PS_HOLD(D404) go to High
4. Troubleshooting
Start
Battery voltage. higher
than 3.5V?
TP1 high to low
when key press?
TP2, TP3, TP4,
TP5, TP6, TP7 power up?
Is clock ok?
R427 : 19.2M
C462 : 32.768Khz
Change or charging the
Battery
1. Check correctly working
power key
Change the Main
board
Change the Main
board
NO
YES
YES
YES
YES
NO
NO
NO
Redownload sw image
TP10 is high ?
Содержание E900
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