Samsung eMMC Code Identity Reference — quick map for repair techs. Attribution: GSM4Files.

Samsung eMMC Code Identity Reference — Technician’s Quick Map (8GB → 64GB)

Posted by GSM4Files · Essential reference for mobile repair techs

Pro tip for technicians: knowing the eMMC code identity can save hours — matching capacity, binning and replacement compatibility prevents boot failures after chip swaps. This guide condenses the Part-3 Samsung SEC eMMC code map into an easy-to-scan reference with a generated diagram you can use on the bench.

Why eMMC Code Identity Matters

The eMMC chip stores system firmware, user data, and calibration tables. Each Samsung eMMC variant has a code that indicates manufacturing batch, capacity and sometimes partitioning/bad-block handling. Replacing a dead eMMC with the wrong part can cause boot loops, missing partitions, or bricked devices.

Quick Capacity Guide (high-level)

  • 8GB — Common in entry-level devices; look for model prefixes like KMQ and suffixes (B214, B315, B316).
  • 16GB — Many variations (single/double/3-package IDs). Watch for codes KMQ8xx / KMF8xx / KMxxxx.
  • 32GB — Mid-range chips used widely; codes include KMG, KMQ4, and family IDs mapped to B8xx or B4xx test batches.
  • 64GB — High capacity chips (KMRC, KMR, KMGP etc.) used in higher-end models; careful bin matching advised.

Best Practices for Technicians

  1. Identify exact eMMC code from the chip marking or service chart before replacing.
  2. Prefer exact part matches for capacity & family — cross-family swaps may fail.
  3. Use verified donor boards when transplanting eMMC; avoid mixing different controller revisions.
  4. Always backup the original eMMC image if possible before any swap or reworking.

Common eMMC Code Examples (illustrative)

8GB  — KMQ7X0005A  KMQN10005M  KMQ7xxxx  (B214/B315/B316)
16GB — KMQ820005M  KMF310012M  KMF820012M (B418/B305/B217)
32GB — KMQ4Z0013M  KMGD6001BM  KMR420001M (B809/B803/B802)
64GB — KMRC1000BM  KMGP6001BM  KMRH6001AM (B809/B614/B422)

How to use this reference on the bench

1) Read the chip marking (top of eMMC package) with microscope. 2) Match prefix & suffix to the capacity group. 3) When replacing, prefer exact code or same family & batch to avoid controller mismatches.

Quick Troubleshooting Checklist

  • Device boots then hangs → inspect eMMC for signs of damage or BGA ball issues.
  • Device shows ID mismatch after swap → verify controller family & partition layout.
  • Prefer donor boards with same part code (or identical family ID) for reliable results.

Useful Tools & Tips

  • High-magnification microscope or macro lens for clear chip markings.
  • Hot-air rework station with preheater for safe desoldering/reattaching eMMC BGA.
  • Emmc reader/cloner for backing up original image when possible.

🔧 Bookmark GSM4Files — more repair charts, jumper diagrams & pro tips

Posted by GSM4Files. Use this reference responsibly — always verify chip markings before replacement.