(There is a difference between these two situations. If there is no service, it means that no signal is received. Write the data first and then reinstall the CPU. A small part of the CPU or intermediate frequency is damaged. In this situation, you do not need to check the antenna loop (antenna switch, filter, etc. ), because they are dual-band or even triple-band mobile phones, if the antenna loop (antenna switch, filter, etc.) fails, there will be at least one or two signals without flashing no service, if it is an "emergency call".)
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