9. Flow Chart of Troubleshooting
9-1. Power On
'Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.5V
Yes
U400 PIN57(PS_HOLD) = 2.6V?
Yes
Check the Clock at
OSC400=32.768KHZ?
Yes
L401(VREG_MSMC) =1.2V?
Yes
L401(VREG_MSME) = 1.8V?
C418(VREG_MSMP) = 2.6V?
C416(VREG_MSMA) = 2.6V?
C408(VREG_TCXO) = 2.8V?
Yes
Check for the clock at
C404= 19.2 MHz
Yes
Check the initial operation
Yes
END
No
No
No
No
No
No
Change the Battery
Check the PMU related to PS_HOLD
Resolder OSC400
Check the PMIC
Check the PMIC
Check the clock generation circuit
(OSC200)
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