dead phone repair - AA+ Mobile Repairing Institute

NAND Chip Programming in Mobile Repair

What is a NAND Chip?

NAND chip ek flash memory storage hoti hai jo mobile ke andar data store karti hai:

Operating System (Firmware)

IMEI / Security Data

User Data (Photos, Contacts, Apps)

Agar NAND corrupt ho jaye, mobile:

Boot loop me atak jata hai

Dead ho jata hai

Ya phir no storage detected error deta hai

Common Issues Related to NAND Chip

Corrupted Firmware / Data

Bad Sectors in NAND

Overheating or Physical Damage

Shorted NAND

Software Glitches after Update/Flashing

🛠 Tools Required for NAND Programming

NAND Programmer / eMMC Tool (UFI Box, Easy JTAG, Medusa Pro, etc.)

Hot Air Rework Station

Microscope

Soldering Kit (for BGA work)

Schematic Diagram / Pinout

Computer with Software Support

Step-by-Step NAND Programming Process

Step 1: Diagnosis

Check if mobile stuck on logo / no boot.

Try flashing via normal tools.

If flashing fails repeatedly → NAND issue confirmed.

Step 2: Chip Removal (if required)

Use hot air station to carefully remove NAND chip from motherboard.

Protect nearby components with Kapton tape.

Step 3: Chip Connection

Place NAND chip in programmer socket or connect via test points.

Some tools support ISP (In-System Programming) → no need to remove chip.

Step 4: Read & Backup

Use programmer software to read dump of old NAND.

Always keep backup of IMEI / security partitions.

Step 5: Erase & Reprogram

Erase bad data from NAND.

Write fresh firmware + security data.

Repair IMEI if required.

Step 6: Verification

After programming, verify written data.

Re-solder NAND back to motherboard (if removed).

Step 7: Testing

Power on mobile.

Check if device boots properly and storage is detected.

⚡ Pro Tips for Technicians

Always keep a full dump library for different models.

Avoid overheating NAND during removal → it can get permanently damaged.

Use good quality flux for reballing/soldering.

ISP method is safer for beginners (no risk of chip damage).

NAND reprogramming is mostly required in Samsung, Oppo, Vivo, Xiaomi phones.

✅ Benefits of NAND Programming

Revives dead phones

Fixes boot loop and storage errors

Saves customer’s data (if backup is possible)

Adds advanced-level income for technicians

Meta Description

NAND Chip Programming in Mobile Repair explained – Learn a step-by-step guide for diagnosing, removing, reprogramming, and repairing NAND flash in dead or boot loop phones.

Tags

nand chip programming, emmc repair, nand reprogramming mobile, dead phone repair, boot loop fix nand, mobile motherboard repair, ufi box nand, easy jtag nand repair

How to Trace Short Circuit in Mobile Motherboard

What is a short circuit in a mobile?

Short circuit tab hota hai jab positive (VCC) aur ground (GND) line aapas me connect ho jayein, ya koi component internally short ho jaye. Isse:

Mobile dead ho jata hai

Battery jaldi heat hoti hai

Phone boot nahi hota ya restart loop me chala jata hai

Common Causes of Short Circuit

Water Damage – Moisture se carbon deposit hota hai

Faulty Capacitors – SMD capacitors sabse zyada short hote hain

Burnt ICs – Power IC, Charging IC, Audio IC, CPU

Wrong Jumper or Repair Mistake

High Voltage Charger/Lightning Strike

🛠 Tools Required

Digital Multimeter

DC Power Supply

Hot Air Gun

Microscope (for small components)

PCB Cleaner (Isopropyl alcohol)

⚙️ Step-by-Step Method to Trace Short Circuit

Step 1: Visual Inspection 👀

Board ko microscope se check karo

Burnt area, corrosion, ya carbon deposits search karo

Step 2: Continuity Test (Multimeter) 🔔

Multimeter ko diode/continuity mode par set karo

VCC line aur ground test karo

Agar beep constant aaye → short confirmed

Step 3: Resistance Test 📉

Multimeter ko resistance mode par set karo

Low resistance (near 0Ω) means direct short

High resistance means line is ok

Step 4: DC Power Supply Method 🔋

Motherboard ko DC Power Supply par connect karo

Voltage set = 1V to 2V (start low)

Current draw observe karo:

High current immediately = direct short

Finger test / thermal camera use karke heating component identify karo

Step 5: Heat Method 🌡️

Agar faulty capacitor/IC short hai → woh jaldi garam hoga

Heat spot par component replace karo

Step 6: Isolation Method ✂️

Shorted section trace karke components remove karo one by one

Short disappear hone par faulty part confirm ho jata hai

Step 7: Repair / Replace 🔧

Faulty capacitor/IC ko replace karo

Jumper ya reballing sirf tab karo jab zaroori ho

Pro Tips for Technicians

Hamesha low voltage se start karo jab DC Power Supply use kar rahe ho

Kapton tape use karke nearby components protect karo jab heat do

Agar short capacitor mil jaye → usko nikal kar phir line check karo

Always cross-check with schematic diagrams (ZXW, Wuxinji)

✅ Benefits of Correct Short Circuit Tracing

Time save hota hai

Repair success rate improve hoti hai

Customer ko long-lasting solution milta hai

Shop ki reputation grow hoti hai

Meta Description

How to Trace Short Circuit in Mobile Motherboard – Complete step-by-step guide using multimeter, DC power supply, and heat detection methods for mobile repair technicians.

Tags

short circuit in mobile, mobile motherboard repair, short tracing guide, dc power supply mobile repair, multimeter short test, capacitor short in phone, mobile repair step by step, dead phone repair

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NAND Chip Programming in Mobile Repair

How to Trace Short Circuit in Mobile Motherboard