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4. TROUBLE SHOOTING
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4.10 Power ON Trouble Shooting
Power On sequence of E400 is :
Power key press
KPD_PWR_N go to low
PM809 Power Up
VREG_MSMC1_1.1V (L400), VREG_MSMC_1.1V
(L401), VREG_MSME_1.8V (L40), VREG_P3_.85V (C453), VREG_MSMA1_.6V (C448), VREG_MSMA_1.V (C444) VREG_
TCXO_.85V (C449) power ON
Phone booting and PS_HOLD(D401) go to High
START
Change or charging the Battery
No
Yes
Redownload SW image
Check correctly working power key
No
Yes
Change the Main board
No
Yes
Change the Main board
No
Yes
Battery voltage higher than 3.70V(OCV)?
TP1(R810) high to low
when key press?
Check below power output
(VREG_MSMC1_1.1V)
(VREG_MSMC_1.1V)
(VREG_MSME_1.8V)
(VREG_P3_.85V)
(VREG_MSMA1_.6V)
(VREG_MSMA_1.V)
(VREG_TCXO_.85V)
Is clock ok?
TP (X00) : 19.M