Flow Chart Of Troubleshooting - Samsung SGH-J400 Service Manual

9. Flow Chart of Troubleshooting

9-1. Power On
' Power On ' does not work
Check the Battery Voltage
R611(U803 BB_RESET) is
OSC600 is 32.768Khz?
Each Level Shifter and PMIC
Check the initial operation
Yes
is more than 3.4V
Yes
2.9V?
Yes
Q600 outputs are
2.9V and 1.8V?
Yes
Yes
outputs are OK?
Yes
Yes
END
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No
Change the Battery
No
Check the PMIC (U603)
No
Check the Q600(Level Shifter)
No
Check the OSC600
No
Check the PMIC(U603) related Level
9-1
Shifer output