Here’s the Lenovo A7-30 A3300 insert SIM card solution that can be used to solve and fix if the device unable to accept or accept any working SIM card module being inserted to it.
This solution shows the connection lines paths of Lenovo A3300 sim card circuit on the PCB board layout. By using this solution you can easily determine which components or parts needs to check and or replace.
To fix this problem you may consider this procedures below:
First check and try to restore and update the device firmware.
Clean and check the Sim card pin connectors for possible damaged and oxidization build ups.
If the procedures above does not fix the problem, you may then proceed to hardware troubleshooting. Refer to the solution below and do have a check and test procedure on some components on Lenovo A3300 PCB board
Lenovo A3300 Sim Card Ways Problem, Sim Ic Jumper, No Sim Card Found
Re-solder all 6 SIM card contacts.
Check continuity between SIM Power line (Mentioned in picture) and capacitor, if a capacitor is damaged replace it. (P.S. If you are not able to replace capacitor, then replace the entire SIM Card and Memory Card Strip.)
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Lenovo A7-30 A3300 Insert Sim IC Solution Jumper Problem Ways Sim Not Working Sim Not Valid
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