Sharp SGH-J200 - Manual (Page 32)

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