Table of Contents
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Power On/Off & Hang Problem
Start
Re-Download SW
YES
Check the voltage of TP401, U400 pin 32=3.8V?
YES
Check the voltage of the following pins at U400
VCORE_C407=1.8V?
VDD_C408=2.7V?
AVDD_C409=2.8V?
VMEM_C411=2.7V?
VBAT_C405= 3.8V?
YES
Check the X100=32.768KHZ
YES
Check the U603_C642=26MHZ
YES
The Phone Will Power On
NO
Go to step 2
NO
Replace the U400
NO
Replace the U400
NO
Change X100
NO
Change U603
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4. Troubleshooting
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