Flow Chart Of Troubleshooting - Samsung SGH-Z140 Service Manual

7. Flow Chart of Troubleshooting

7-1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.3V
U500PIN57(PS_HOLD)
= 2.6V ?
Check the Clock at
OSC501 = 3 2KHZ
C536(VREG_MSMC) =
1.375V ?
C537(VREG_MSME) = 1.8V ?
C522(VREG_MSMP) = 2.8V ?
C523(VREG_MSMA) = 2.8V ?
C515(VREG_TCXO) = 2.8V ?
Check for the clock at
C422= 19.2MHz
Check the initial operation
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
Change the Battery
No
Check the PMIC related to PS_HOLD
No
Resolder OSC501
No
Check the PMIC
No
Check the PMIC
No
Check the clock generation circuit
(related to OSC200)
7-1