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Only for training and service purposes
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4. TROUBLE SHOOTING
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ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ͑
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4.10 Power ON Troubleshooting
Power On sequence of P500 is :
Power key press
Æ
KPD_PWR_N go to low
Æ
PM7540 Power Up
Æ
VREG_MSMC1_1.2V(C433),
VREG_MSMC2_1.2V(C434), VREG_MSME_1.8V(C435), VREG_MSMP_2.7V(C453), VREG_MSMA_2.6V(C452),
VREG_TCXO_2.85V(C457) power ON
Æ
Phone booting and PS_HOLD(D404) go to High
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START
Battery voltage higher than
.70V(OCV)?
Change or charging the Battery
No
Yes
Redownload SW image
VA20 hight to low when key pness?
Check correctly working powerkey
No
Yes
VMSMC1_1.2V, VMSMC2_1.2V,
VMSMP_2.6V, VMSME_1.8V, VTCXO_2.85V,
VMSMA_2.6V power up?
Change the Main board
No
Yes
is clock OK?
X1:19.2M
Change the Main board
No
Yes