Samsung Galaxy S4 SIM and Memory Card Problem

SIM Problem:

• SIM Card not inserted error message.

MMC Problems:

• Memory Card not found.
• Not able to store data in MMC.
• MMC not accessible.
• Not able to read MMC.
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SIM:

• Restart your phone and check.
• Change SIM card and check.

MMC:

• Remove and reinsert memory card.
• Scan your MMC via Antivirus and check.
• Back up your Memory Card and Format, afterwards recheck.
• Check with any other working memory card.

Hardware Solution for SIM and MMC Card

• Re-solder all 6 SIM card contacts.
• Check continuity between SIM Power line (Mentioned in picture) and capacitor, if 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.)

• Re-solder on-board connector of SIM and MMC Card and check.