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Level 3 Repair
8-4
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8-3. Troubleshooting
8-3-1. LOGIC part
8-3-1-1 POWER ON
Check the current
consumption
>= 100mA?
Download
NO
Check the U401
(open, short, etc)
Check the clock
R403 = 19.2Mhz ?
Check the initial operation
Check the clock generation circuit
Resolder OSC400
Check the PMIC
related to PS_HOLD
Change the battery
C432(VREG_MSMC1)=1.2V?
C431(VREG_MSMC2)=1.2V?
C430(VREG_MSME)=1.8V?
C409(VREG_MSMP)=2.6V?
C410(VREG_MSMA)=2.6V?
Check the clock at
OSC400 = 32KHz?
Check the TP_PS_
HOLD pin PS_HOL
D = 2.6V?
Check the battery
voltage
>= 3.45?
Yes
Power switch on
NG
END
Yes
Yes
Yes
Yes
Yes
NO
NO
NO
NO
NO