In this post Nokia Lumia 520 memory card problem will be hopefully solved. In this phone memory card jack is placed just above the SIM card jack. It is where you put the external memory cards to use with your mobile phone.
There is not a lot to explain in this diagram. If the external memory card is not being read in your Nokia Lumia 520 make sure your memory card is not faulty. If the memory card is okay then you should clean the MMC jack marked with red box in the diagram. If the MMC jacket is in good condition and your are still having this problem then you need to change the MMC IC which is marked with green line.
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Here are Nokia Lumia 520 memory card problem solution. Please study these diagrams very carefully before you start repairing.
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Note: Every repairing solution posted here is tested by at least one member of our team. Use the information available here at Your Own Risk. We are not responsible if any harm comes to your device during the repairing process.