Flow Chart Of Troubleshooting; Power On - Samsung SGH-Z720M Service Manual

9. Flow Chart of Troubleshooting

9-1. Power On

' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
U401 PIN57(PS_HOLD)
Check the Clock at
OSC400=32.768KHZ?
L400(VREG_MSMC) =1.37V?
L401(VREG_MSME) = 1.8V?
C424(VREG_MSMP) = 2.6V?
C422(VREG_MSMA) = 2.6V?
C411(VREG_TCXO) = 2.8V?
Check for the clock at
Check the initial operation
Yes
Yes
= 2.6V?
Yes
Yes
Yes
Yes
C405= 19.2 MHz
Yes
Yes
END
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
No
Change the Battery
No
Check the PMU related to PS_HOLD
No
Resolder OSC400
No
No
No
Check the clock generation circuit
9-1
Check the PMIC
Check the PMIC
(TCX200)