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First Option:
Please change Phone in the Other Sim and check the Phone Sinal IF Signal Problem not SOlved So
Secnd Option:
Your Phone Network Signal IC Fault SO Please change Network IC
And Signal Problem will Solved Quickly
following this instruction, 1.remove the white rubber ontop the power botton. 2.find a metal that can touch both edges of the tip where the power botton was removed from (positive -positive). 3.your phone will come on then you can enjoy your phone without switch botton.
You must change PA(Power Amplifier) IC on your phone.5-6second signal than gone is a sign of PA IC not work any more.You know that PA is an IC where phone use to transmit.I hope it help.
Here is your solution. U need to open it with china screw-driver set. Then put a three fold paper under the two main ICs. CPU and UEM which both are looking same in PCB than tight the screws properly. This is caused by uncertain pressure on PCB. The PCB got bent and signal runs up quickly.
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