Blu STUDIO 5.0 CE - Chapter 6 Troubleshooting; Cannot Power on

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CHAPTER 6 TROUBLESHOOTING
CANNOT POWER ON-CURRENT SWING
INSTABILITY
26MHZ&32.768KHZ
Check and replace
system clock：26MHz
&32.768KHz
Cannot power on
Check the power manage
supply output：
VIO 18
DVDD 2.8V
VIO 28
VTCXO 2.8V
VEMC 3.3V
VRTC 1.2V
Replace U101
MT6572
Upgrade the software
Check and
replace the I/O
connector
Replace or re-weld
flash
Replace or
re-weld
power
manage IC
NO
NO
NO
NO
NO
NO