The solution below shows a detailed info about the LG E460 sim card circuit. The image will help you determine of which particular parts or components needs to be cleaned, trace, check and or replace.
After dis assembly check all sim jack points at mother board with meter.check all these parts and track that are given in above diagram and if any of them is missing apply jumpers to make that path in good condition.if any of the components is missing replace it with new.
LG E460 Optimus L5 sim card connection tracks
If you may try to fix such sim card problem , you may need to first clean the SIM card pin connector for possible oxidation build up.
Check and trace the Sim card pins that holds for Sim supply voltage and ground lines.
If the steps above already done and seems both okay,
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