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supply, clock is normal and defective typical issue is focus on CPU or FLASH poor soldering or
damage, and maybe software do not fit for hardware.
Corrective action: check software fit for hardware whether or not, resolding CPU and FLASH or exchange new
CPU and FLASH.
图 1(figure 1)
Description: can’t power on (handset is dead when upgrade software.)Details as figure 2.
Root cause: the power supply and clock both work on as common during upgrade software.
The typical defective issue as poor soldering or go to fall, other way as exchange
CPU or Flash.
Corrective action: re-solder CPU and Flash, or replace them.
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