
🔧 What is Chip-Level Mobile Repair?
Chip-level mobile repair refers to the process of diagnosing and fixing faults directly on the motherboard (logic board) of a mobile phone. This involves working on micro components such as ICs (Integrated Circuits), resistors, capacitors, coils, and connectors—often using a microscope and precision tools. Chip-Level Mobile Repair Course.
🧠 Key Features of Chip-Level Repair:
Feature | Description |
---|---|
🧩 Micro Component Repair | Involves soldering or replacing tiny chips like PMIC, CPU, eMMC, Audio IC, etc. |
🔬 Advanced Tools Required | Hot air gun, rework station, microscope, multimeter, DC power supply. |
📊 Circuit-Level Diagnosis | Uses voltage testing, line tracing, and schematic reading to find faults. |
⚠️ Handles Complex Faults | Solves “no power”, “dead phone”, “no charging”, “no network”, “auto restart”, etc. |
🛠️ Not Just Part Replacement | Goes beyond battery/screen swaps — works at the electronic component level. |
🧰 What’s Usually Repaired at Chip Level?

- Power IC (PMIC)
- Charging IC
- Network IC
- Audio IC
- eMMC/UFS (memory)
- CPU (in rare expert cases)
- Display connector tracks
- Short circuits on PCB
📈 Why is Chip-Level Repair Important?
- Cost-effective: Saves expensive boards from being replaced.
- High demand: Many phones become unusable due to motherboard-level issues.
- Career opportunities: Skilled chip-level technicians are always in demand.
- Specialized skill: Not every mobile shop does this — it sets you apart.
🎯 Who Should Take This Chip-Level Mobile Repair Course?
This course is ideal for anyone interested in advanced mobile hardware repair, especially those looking to build a professional career or business in mobile servicing. Chip-Level Mobile Repair Course.
👤 Suitable For:
Group | Why It’s a Good Fit |
---|---|
🧑🔧 Existing Mobile Technicians | Upgrade from basic part replacement to full motherboard-level repair. |
👨🎓 Diploma/ITI Students (Electronics) | Gain real-world, high-demand repair skills that complement your studies. |
👨💼 Job Seekers | High job potential in mobile service centers, especially in chip-level labs. |
👩💻 Tech Enthusiasts | Learn how smartphones work internally and how to fix advanced issues. |
💼 Entrepreneurs | Start your own mobile chip-level service business or lab. |
📱 Mobile Shop Owners | Add premium chip-level repair to your service offerings and increase income. |
✅ Eligibility Requirements
- 🔋 Basic mobile knowledge is helpful but not mandatory.
- 🔧 No need for prior chip-level experience.
- 📚 10th or 12th pass is enough – no formal degree required.
- 💡 Willingness to learn hands-on and handle micro-electronics.
💡 Bonus: Who Else Can Benefit?
- People in rural areas looking for a low-investment, high-return skill.
- Freelancers wanting to offer specialized home-based repair services.
- Mobile refurbishers who work with dead phones or recycled stock.
🧰 Tools Required for Chip-Level Mobile Repair
To successfully perform chip-level repair on mobile phones, you need a set of specialized tools that allow you to work with micro components on the motherboard.
🔧 Essential Tools List
Tool | Purpose |
---|---|
🔍 Microscope (Digital or Stereo) | To clearly view and work on tiny SMD components and ICs. |
🔥 SMD Rework Station (Hot Air Gun) | For removing or replacing SMD ICs and components. |
🪛 Soldering Iron (Fine Tip) | For manual soldering of components and jumper wires. |
📏 Multimeter (Digital) | To test voltage, resistance, and continuity on the PCB. |
🔌 DC Power Supply | To power the motherboard directly for testing without battery. |
🧼 Ultrasonic Cleaner | Cleans motherboards from water damage, corrosion, and dust. |
🧊 PCB Holder / Jig | Holds the motherboard firmly during repair. |
💡 Backlight Tester | Tests display and backlight circuits on LCDs. |
🧲 BGA Reballing Kit | Used to reball and reattach BGA-type ICs. |
🔬 Flux & Solder Paste | Ensures strong and clean solder joints. |
🧵 Jump Wires & UV Mask | For track repair and insulation after jumper work. |
📚 Schematic/ZXW Tools (Software) | For line testing and IC pinout reference diagrams. |
📦 Optional but Useful Tools
- Hot plate (preheater)
- Tweezers (anti-static, fine tip)
- Infrared thermometer
- ESD protection mat & wrist strap
- Magnifying glass lamp
- Thermal camera (for short detection)
🛒 Where to Buy These Tools?
- Online: Amazon, Robu.in, Aliexpress, Banggood
- Offline: Lamington Road (Mumbai), SP Road (Bangalore), Ritchie Street (Chennai)
- Wholesale Websites: toolwala.com
📚 Detailed Course Modules for a Chip-Level Mobile Repair Course

📚 Module 1: Basics of Mobile Hardware
- Introduction to mobile phone components
- Types of PCBs (Single, double & multi-layer)
- Function of ICs, resistors, capacitors, coils
- Identifying components on motherboard
- ESD safety handling & workspace setup
🔧 Module 2: Soldering & De-Soldering Techniques
- SMD (Surface Mount Device) basics
- Using soldering iron and hot air gun
- Leaded vs lead-free soldering
- Practice: Remove & place SMD components
- Use of flux, solder paste, wick & BGA balls
- Micro jumper wire training
⚡ Module 3: Power Section Troubleshooting
- Power IC (PMIC) structure & function
- How to test battery connector & input voltages
- No power / Auto restart / Dead phone issues
- Voltage testing on main power lines
- Using DC power supply to power the board
- 1.8V, 3.0V, 5.0V line testing
🔌 Module 4: Charging & USB Section
- Charging IC types & pinout (e.g. BQ, SMB)
- Fast charging vs normal charging faults
- USB port replacement & soldering
- Charging not supported / not charging issues
- Battery protection circuit
📶 Module 5: Network & Signal Section
- RF section overview (antenna, PA, RF IC, Baseband)
- SIM not detecting, no network issues
- IMEI repair basics
- Network lines tracing
- RF shielding removal & testing
🎧 Module 6: Audio, Mic, and Sensor Section
- Audio IC, mic, speaker & ringer circuit
- How to solve no sound / distorted sound
- Earpiece / loudspeaker pinout & continuity test
- Sensor circuit overview (light, proximity, gyroscope)
📱 Module 7: Display & Touch Section
- Display connector fault diagnosis
- Backlight IC & filter check
- Touch not working – touch IC check
- Jumper methods for missing pads
- Display short vs CPU fault detection
🧠 Module 8: Advanced Troubleshooting & Jumper Techniques
- Using schematic & ZXW tools
- Fault finding with multimeter and power supply
- Track cutting & micro jumper
- Line tracing using diagram software
- Practice: Repairing dead motherboards
💽 Module 9: Memory (eMMC/UFS) & Software Repair
- eMMC IC understanding
- Heat gun removal technique
- eMMC testing & replacement basics
- ROM programming, flashing, boot repair
- Dead boot recovery (intro to UFI/JTAG)
🎓 Final Module: Assessment & Certification
- Real motherboard repair tests
- Identify & repair common faults
- Viva or oral evaluation
- Certificate issued (some institutes)

🔰 Module 1: Basics of Mobile Hardware
This is the foundation module of any chip-level mobile repair course. It introduces you to the core components of a smartphone’s hardware and helps you understand how mobile phones are built and function internally. Chip-Level Mobile Repair Course.
🧠 Key Concepts Covered
1. Mobile Phone Architecture
- Motherboard (Main Logic Board)
- Daughterboard (sub-PCB for charging, audio, etc.)
- Components: ICs, connectors, jumpers, antennas
2. Types of PCBs
Type | Description |
---|---|
Single-layer PCB | Basic, used in feature phones |
Double-layer PCB | Common in mid-range smartphones |
Multi-layer PCB | High-end phones (e.g. iPhone, Samsung) |
3. Main Components on Motherboard
Component | Function |
---|---|
🔲 IC (Integrated Circuit) | Controls various operations like power, network, audio |
🔌 Battery Connector | Connects battery power to the board |
🟡 Coils & Capacitors | Filter and regulate voltage |
⚙️ Resistors | Control current flow in specific paths |
📶 Antennas | Signal transmission for network, Wi-Fi, Bluetooth |
🎧 Connectors (Display, USB, SIM, Speaker) | Interconnect different parts to the logic board |
4. Introduction to SMD Components
- Identification by shape & size
- Color coding & board label references (C = Capacitor, R = Resistor, L = Inductor, U = IC)
5. Voltage Lines in PCB
- Vbat (3.7V–4.2V) – from battery
- Vph_power / Vcore – internal power lines
- 1.8V / 2.8V / 3.0V – common voltage lines to ICs
6. Safety Measures
- ESD (Electrostatic Discharge) protection
- Use of anti-static wristband
- Cleaning workspace and using ESD mats
- Avoiding damage to components while testing
🔍 Practical Training
- Identifying components on dead/dummy PCBs
- Using a multimeter for basic continuity testing
- Reading basic line diagrams or schematic block diagrams
🔧 Module 2: Soldering & De-Soldering Techniques
This module trains you in the core skill of chip-level repair — the ability to accurately solder and de-solder tiny components on a smartphone’s motherboard. Without mastering this, IC-level repair is nearly impossible. Chip-Level Mobile Repair Course.

🧠 What You’ll Learn
1. Understanding SMD Components
- What is SMD (Surface Mount Device)?
- Common SMD parts: capacitors, resistors, diodes, coils, ICs
- Identifying SMD values using multimeter & visual code
2. Tools Used in Soldering & De-Soldering
Tool | Use |
---|---|
🔥 Hot Air Gun / SMD Rework Station | To heat and remove ICs or micro components |
🪛 Soldering Iron (Fine Tip) | To manually solder jumpers and small parts |
🧴 Flux & Solder Paste | For clean and strong solder joints |
🧵 Solder Wire (0.3mm – 0.5mm) | Conductive material for joining points |
🪫 Solder Wick (Desoldering Braid) | Used to remove excess solder |
🧊 Tweezers & PCB Holder | Precision handling and support during work |
🔩 Types of Soldering You’ll Practice Chip-Level Mobile Repair Course
✅ SMD Component Soldering
- How to place & solder small capacitors, coils, ICs
- Proper temperature control (250–350°C typical)
✅ Jumper Wire Techniques
- When tracks are broken, use jumpers
- Micro jumper techniques under microscope
✅ BGA IC Reballing (Advanced)
- Used for CPU, eMMC, PMIC
- Process: Remove ➝ Clean ➝ Apply solder balls ➝ Reattach
♨️ De-Soldering Techniques
- Using hot air to loosen SMD parts
- Using solder wick to clean pads
- How to avoid PCB pad lifting or damage
- IC de-soldering without damaging nearby components
⚠️ Safety & Quality Tips
- Always apply flux before soldering
- Avoid overheating — it may damage the motherboard
- Clean the area with IPA solution after work
- Wear an ESD wrist strap while working
🔬 Practical Exercises
- Practice on dead mobile PCBs
- Solder/remove 10+ different SMD components
- Reball & reattach 1 BGA IC (for advanced batch)
🔋 Module 3: Power IC and Battery Issues
This module focuses on diagnosing and repairing issues related to Power ICs (PMIC) and battery-related faults, which are among the most common causes of “dead phones” or “auto restart” problems in smartphones. Chip-Level Mobile Repair Course.
🔌 What is a Power IC (PMIC)?
A Power Management IC (PMIC) distributes different voltage levels to various components in a phone (CPU, RAM, camera, etc.). If the PMIC fails, the phone might:
- Not turn on
- Auto restart
- Not charge
- Heat up abnormally
🧠 What You’ll Learn in This Module Chip-Level Mobile Repair Course
1. Power Section Overview
- Battery connector & main power line (VBAT)
- PMIC function and placement on motherboard
- Common power lines: 1.8V, 2.8V, 3.0V, VPH_PWR
2. Common Battery-Related Issues
Problem | Possible Cause |
---|---|
❌ No Power | Faulty PMIC, battery dead, main line short |
🔁 Auto Restart | Power IC heating, unstable 1.8V/3.0V supply |
🔋 Not Charging | Charging IC or PMIC failure |
🔥 Heating Issue | Short circuit or battery connector problem |
🛠️ Diagnostic Techniques
✅ Using a Multimeter
- Check VBAT at battery connector (should be 3.7V–4.2V)
- Continuity test from battery to PMIC
- Resistance check on power lines
✅ Using a DC Power Supply
- Apply 3.7V to battery points
- Observe current draw:
- 0 Amp = Dead short or open
- 0.03–0.10 Amp = CPU/power IC idle
- Over 0.50 Amp = Boot current spike (normal)
♻️ Power IC Replacement Process Chip-Level Mobile Repair Course
- Use hot air gun to remove the PMIC
- Clean PCB pads using solder wick
- Apply fresh solder paste
- Place new PMIC and reheat evenly
- Test voltage lines post-installation
🧯 Precautions
- Don’t apply excess heat (limit to 320–360°C for 30–40 sec)
- Use microscope while placing new IC
- Ensure no nearby SMD components are displaced
💡 Practical Tasks
- Diagnose 3 dead phones with no power
- Replace at least one PMIC successfully
- Create jumper for broken battery line (if needed)
🔌 Module 4: Charging & USB Section
This module trains you to troubleshoot and repair charging-related faults and USB port issues, which are some of the most frequent problems in smartphones. Chip-Level Mobile Repair Course.
🔋 Overview of Charging Circuit
The charging system consists of:
- USB Port / Charging Jack
- Charging IC (e.g., BQ25890, SMB1357)
- Battery connector
- Protection ICs / Thermistor
- Charging path filters / capacitors / diodes
🧠 Common Charging Problems Chip-Level Mobile Repair Course
Problem | Likely Cause |
---|---|
🔌 Not Charging | Broken USB port, faulty charging IC |
🐢 Slow Charging | Bad cable, filter damage, low voltage path |
⚠️ Charging Paused / Temp High | Faulty thermistor or charging IC |
🔋 Charging Symbol but No Increase | Fake charging due to damaged power line |
❌ Fast Charging Not Working | Data lines not detecting proper protocol |
🛠️ Tools You’ll Use
- Multimeter (for voltage & diode test)
- DC Power Supply (to test current draw)
- Microscope (to inspect USB pad damage)
- Soldering iron or hot air gun (for component replacement)
🔎 Diagnosis Techniques
✅ USB Port Testing
- Check 5V on USB VBUS pin (should be present)
- Inspect USB connector pins under microscope
- Measure diode value between GND and D+, D- lines
✅ Charging IC Testing
- Identify main charging IC (label like
U2
,U7000
) - Check VBUS input → output path → VBAT line
- Remove & replace charging IC if no voltage flows
🔁 Repair Tasks You’ll Perform
- Replace broken USB ports (micro USB / Type-C)
- Change charging IC using hot air
- Clean water-damaged USB connector area
- Add jumper if charging line track is broken
- Test with different USB cable and adapter for confirmation
⚠️ Safety Tips
- Never test charging while motherboard is wet
- Always remove battery before hot air work
- Use correct temperature for USB pad work (280–330°C)
- Avoid overheating thermistor or nearby SMD parts
🔧 Practice Exercises
- Repair 3 phones with “not charging” issue
- Test USB port, VBUS line, and replace at least 1 charging IC
- Use schematic or ZXW tool to trace charging line from USB to PMIC
📶 Module 5: Network & Signal Section
This module focuses on diagnosing and fixing mobile signal problems, including SIM detection issues, no network, emergency calls only, or IMEI-related faults. The goal is to repair or replace components responsible for network transmission and reception, mainly in the RF section of the motherboard. Chip-Level Mobile Repair Course.
📡 Understanding the Network Section
Component | Function |
---|---|
RF IC | Handles radio frequency (2G/3G/4G) signal transmission |
PA IC (Power Amplifier) | Boosts signal before sending to antenna |
Switch IC / FEM Module | Selects signal path between transmit and receive |
Baseband IC / CPU | Handles IMEI, encryption, and modem protocol |
SIM IC / SIM Socket | Detects SIM card and communicates with network |
🧠 Common Network Problems Chip-Level Mobile Repair Course
Issue | Probable Cause |
---|---|
📴 No SIM Detected | Faulty SIM IC, dirty/damaged SIM socket |
🚫 No Signal / Emergency Calls | RF IC or PA IC issue |
🆔 Invalid IMEI / Null IMEI | Corrupted baseband data or CPU fault |
🔁 Network Fluctuation | Dry solder on RF section, faulty antenna switch |
🈚 Signal in One Band Only | Band filter damage, partial PA failure |
🛠️ Diagnosis Techniques
✅ SIM Section Testing
- Check SIM socket pins with multimeter
- Measure voltage on SIM VCC (around 1.8V or 3V)
- Continuity from SIM connector to SIM IC
✅ Network IC Testing
- Visual check for heating, cracks, corrosion
- Use DC power supply to test boot current — missing RF voltage?
- Check ANT1 / ANT2 line continuity to PA IC
✅ IMEI & Baseband Testing
- Dial
*#06#
– if IMEI shows “null” → baseband issue - Flashing or QCN restore may be needed (software repair)
- If no baseband → suspect CPU or baseband IC
🔁 Repair Tasks You’ll Learn
- Replace SIM socket using soldering iron
- Resolder or replace RF IC or PA module
- Jumper SIM lines if track is broken
- Clean & reseat antenna connector
- Restore IMEI using software (MTK/Qualcomm tools – for educational use only)
⚠️ Precautions
- Use low heat around CPU/RF IC
- Do not flash firmware without backup (IMEI risk)
- Use non-metal tweezers while checking antenna path
- ESD protection is critical near baseband & RF
🔧 Practice Assignments
- Solve 2 phones with “no SIM” problem
- Test and repair one RF/PA IC
- Track and jumper missing SIM line
- Restore IMEI using supported software tools
🎧 Module 6: Audio, Mic, and Sensor Section
This module covers diagnosing and fixing faults related to the audio system, microphone, earpiece, loudspeaker, and mobile sensors such as proximity and light sensors. These are essential for making calls, using apps, and general phone usability. Chip-Level Mobile Repair Course.
🔊 Overview of the Audio Section
Component | Function |
---|---|
Audio IC / Codec IC | Controls all sound input/output (mic, speaker, etc.) |
Earpiece | Allows you to hear during a call |
Mic (Microphone) | Captures your voice during calls/recordings |
Loudspeaker | Plays media/ringtones |
Audio Filters/Coils | Protect and stabilize audio lines |
Sensor IC / Proximity Sensor | Detects light or nearby objects (used during calls) |
🧠 Common Audio & Sensor Problems Chip-Level Mobile Repair Course
Issue | Likely Cause |
---|---|
🎙️ Mic not working | Faulty mic, mic line break, audio IC issue |
🔇 No sound in call | Earpiece or codec IC problem |
📢 Loudspeaker not working | Dry solder, damaged speaker or filter |
🔁 Sound only on one side | Half short in audio lines or damaged IC |
🔦 Auto screen off during call not working | Proximity sensor faulty |
🌗 Auto brightness not working | Light sensor failure |
🛠️ Diagnostic Techniques
✅ Mic & Speaker Testing
- Use multimeter to test resistance (mic: 600–1000Ω, speaker: 28–32Ω)
- Check continuity between connector and audio IC
- Use audio test codes (
*#0*#
or service mode) to test output
✅ Sensor Testing
- Use app like Sensor Box / CIT menu to check proximity/light sensor
- Test sensor voltage at connector (usually 1.8V/3.0V)
- Clean sensor area if blocked (especially after water damage)
🔁 Repair Techniques You’ll Learn Chip-Level Mobile Repair Course
- Replace mic / speaker / earpiece with soldering iron or jumper
- Clean and rework audio IC using hot air
- Jumper broken audio line tracks
- Replace sensor IC or front flex if faulty
- Repair audio filters (L/C/R) using microscope
⚠️ Safety Tips
- Do not apply excess heat to plastic mic or speaker
- Always check filter components before replacing IC
- Use flux & solder paste for clear joints
- Avoid damaging nearby pads during rework
🔧 Practice Exercises
- Solve at least 2 phones with no sound or mic issues
- Replace a mic or speaker on dummy or dead board
- Test and clean a blocked proximity sensor
- Resolder an audio IC with proper temperature control
📱 Module 7: Display & Touch Troubleshooting in Chip-Level Mobile Repair Course
This module focuses on diagnosing and repairing screen-related issues, such as no display, touch not working, flickering, or backlight problems. These faults may stem from the display connector, ICs, or motherboard lines. Chip-Level Mobile Repair Course.
🔍 Understanding Display & Touch Circuitry
Component | Function |
---|---|
Display Connector (FPC) | Connects the LCD/touch flex to the motherboard |
Touch IC / Digitizer IC | Manages input from touchscreen |
Backlight IC / LED Driver | Supplies power to the screen’s backlight |
Filter Coils & Capacitors | Smooth power and signal lines |
EMI Filters | Prevent signal interference (used for touch & data lines) |
🧠 Common Display/Touch Problems
Issue | Cause |
---|---|
⚫ No Display / Black Screen | Damaged display, connector issue, backlight IC fault |
👆 Touch Not Working | Faulty touch IC, broken touch lines |
⚡ Flickering or Dim Display | Damaged backlight filter or IC |
❌ Half Screen Working | Partial signal line damage or connector issue |
🔁 Auto touch / Ghost touch | Moisture, damaged digitizer, shorted touch IC |
🛠️ Diagnosis Techniques in Chip-Level Mobile Repair Course
✅ Visual Inspection
- Use a microscope to check display connector pins
- Look for corrosion, loose solder joints, or pad damage
✅ Voltage Testing with Multimeter
- Check:
- LCD VCC line (3.0V / 1.8V)
- LED+ / LED- lines for backlight power (12V+ on some phones)
- Touch VDD / VIO lines
✅ Using a Test Display
- Always confirm the display works by testing with a working LCD
- Swap with a good known screen to isolate the fault
🔧 Repair Methods You’ll Learn
- Resolder or replace a display connector
- Replace backlight IC or touch IC with hot air gun
- Jumper broken tracks from connector to IC
- Replace filter coil or capacitor in display/touch section
- Clean corroded area with IPA solution after water damage
⚠️ Precautions
- Never overheat the display connector area — it has multiple tiny pads
- Always disconnect battery before working on screen circuits
- Touch IC is heat-sensitive — use controlled airflow (300°C / low speed)
- Use UV solder mask after jumper work to prevent short circuits
🔧 Practice Exercises
- Repair 2 boards with “no display” issues
- Replace a broken display connector
- Diagnose & fix one backlight fault
- Jumper 1–2 broken signal lines under a microscope
🪛 Module 8: Advanced Jumper Techniques
This module teaches the highly valuable skill of track repair using jumper wires, which is critical when dealing with broken pads, cut PCB tracks, or missing connections after IC removal. Mastering jumper techniques allows you to revive motherboards that most technicians consider beyond repair. Chip-Level Mobile Repair Course.
🧠 What is Jumpering in Mobile Repair? Chip-Level Mobile Repair Course
Chip-Level Mobile Repair Course main Jumpering means creating a new electrical connection using a fine wire to bypass a damaged or disconnected path on the PCB. This is common in:
- Pad lifted after IC removal
- Burnt track due to short circuit
- Missing resistor/capacitor lines
- Corroded or broken connector lines
🧰 Tools You’ll Use
Tool | Purpose |
---|---|
🔬 Microscope | Essential for viewing micro points |
🧵 0.1mm Copper Jumper Wire | Used to connect broken pads or tracks |
💡 UV Solder Mask & UV Light | For protecting and fixing jumper points |
🪛 Soldering Iron (Fine Tip) | To place jumpers precisely |
🔥 Hot Air Gun | Used for nearby component soldering |
📚 ZXW/Wuxinji Tool | For identifying track endpoints and IC pin maps |
🔎 Common Jumper Cases You’ll Encounter
Fault | Jumper Fix |
---|---|
❌ SIM Not Detected | Jumper SIM_CLK, SIM_DATA, SIM_RST lines |
🔌 Charging Not Working | Jumper VBUS or USB D+/D- lines to charging IC |
📱 No Display / Touch | Jumper missing VCC or data lines from connector to IC |
🔊 No Audio | Jumper audio output lines from IC to speaker area |
🔋 Battery Not Detected | Jumper BSI, BSI_GND, or NTC lines to PMIC |
⚙️ Step-by-Step Jumper Process
- Identify Broken Track using ZXW or multimeter
- Clean both ends of the track (pad and destination)
- Apply flux, then solder jumper wire carefully
- Route the jumper wire securely (avoid loose or floating wire)
- Cover jumper with UV solder mask and cure with UV light
- Test continuity with multimeter before powering up
⚠️ Pro Tips & Precautions
- Use shortest and straightest jumper path possible
- Never place jumpers under IC without insulation (use UV mask)
- Secure jumpers from moving using solder blob or adhesive
- Practice on scrap boards before doing live repairs
- Don’t run high-current lines (VBAT, VBUS) through jumper wire unless properly insulated
🔧 Practice Exercises
- Perform SIM CLK/IO jumper on a dead SIM line
- Repair a broken USB line using jumper from port to IC
- Jumper missing filter point on display connector
- Use ZXW to trace one complete line and re-route it manually
💽 Module 9: eMMC/UFS Memory IC Work & Software Repair
This advanced module focuses on mobile phone memory ICs, specifically eMMC and UFS chips, which are responsible for storing the operating system (Android/iOS), apps, IMEI, and user data. Faults in these chips often cause dead boot, bootloop, or stuck-on-logo issues. Chip-Level Mobile Repair Course.
🧠 What is eMMC/UFS?
Type | Description |
---|---|
eMMC (Embedded MultiMedia Card) | Older standard memory chip; still used in budget phones |
UFS (Universal Flash Storage) | Faster memory used in modern phones (UFS 2.0, 3.0, etc.) |
These ICs are BGA (Ball Grid Array) chips soldered directly to the motherboard.
🔍 Common eMMC/UFS Faults
Symptom | Likely Cause |
---|---|
⚫ Dead phone / No boot | eMMC/UFS corrupt or detached |
🔁 Bootloop / Stuck on logo | Damaged system partitions |
❌ Cannot flash firmware | Memory IC is read/write protected or bad |
🔄 Auto restart | eMMC wear-out or data corruption |
🆔 Null IMEI | Baseband/NV data inside eMMC lost or corrupt |
🛠️ Tools Used for eMMC/UFS Work in Chip-Level Mobile Repair Course
Tool | Purpose |
---|---|
🔧 UFI Box / Easy JTAG Plus | Read/write/dump eMMC/UFS data |
🔥 Hot Air Station | For removing/resoldering memory IC |
🧼 Flux, Solder Paste, Stencils | For cleaning and reballing BGA pads |
🔬 Microscope | For precise IC placement and soldering |
📀 Firmware Dump Files | Used to repair corrupt eMMC partitions |
🧩 Repair Techniques You’ll Learn
✅ Software Repair
- Connect phone to UFI Box in ISP or socket mode
- Read eMMC/UFS data and check health
- Format user data, repair partitions (BOOT1, EXT_CSD, etc.)
- Write full firmware (raw dump)
- Restore IMEI (if legal in your country)
✅ Hardware Repair
- Remove eMMC/UFS using hot air (approx. 370–400°C)
- Clean PCB pads using solder wick
- Reball eMMC with stencil and BGA balls
- Reattach IC using proper alignment
- Check boot current after replacement
⚠️ Precautions
- Always back up partitions before flashing
- Use correct voltage (1.8V / 2.8V) for reading via ISP
- Never overheat the CPU area while removing UFS
- Use ESD-safe tools – memory ICs are highly sensitive
- Work only under microscope for BGA jobs
🔧 Practical Exercises
- Diagnose and revive a bootloop phone using UFI Box
- Remove and resolder one eMMC IC on a dead board
- Read and format eMMC using ISP pinout
- Practice reballing BGA on dead IC for training
🎓 Module 10: Job Scope After Completing the Chip-Level Mobile Repair Course
Successfully completing a Chip-Level Mobile Repair Course opens up multiple career paths, income opportunities, and even the potential to start your own repair business or service lab. This is a highly skill-based profession with growing demand across India and globally. Chip-Level Mobile Repair Course.
✅ Job Opportunities
Role | Where You Can Work |
---|---|
🧑🔧 Mobile Chip-Level Technician | Branded or multi-brand service centers |
🧰 Service Center Staff | Samsung, Vivo, Oppo, Xiaomi, Realme, etc. |
🖥️ PCB Repair Expert | Refurbishment labs or used phone warehouses |
🔧 Freelance Technician | Home service / door-step repair support |
🎓 Technical Instructor | Training centers and polytechnic institutes |
💼 Average Salary in India (2025)
Experience Level | Salary Range (per month) |
---|---|
Fresher | ₹10,000 – ₹15,000 |
Intermediate (1–2 yrs) | ₹15,000 – ₹25,000 |
Advanced / Branded Lab | ₹30,000 – ₹60,000+ |
Freelancer / Self-employed | ₹1,000–₹2,000 per phone (profit-based) |
🚀 Self-Employment & Business Scope
If you choose to start your own mobile repair shop, here’s what you can do:
- Offer chip-level repair for “dead phones” (high-margin)
- Start B2B servicing (repair for other mobile shops)
- Sell refurbished phones by fixing dead stock
- Add services like unlocking, FRP bypass, water damage, etc.
- Train junior technicians and charge training fees
🌍 Growing Market Demand
- 📱 Smartphones are more expensive → people prefer repair over replacement
- 🔁 Second-hand & refurbished market booming
- 🧑🔧 Few trained chip-level technicians → less competition, more work
- 💡 Government schemes (e.g., Skill India) support technical training
🛠️ Additional Certification Advantage for Chip-Level Mobile Repair Course
Certification | Benefit |
---|---|
Local Training Center Certificate | Valid for private jobs or self-employment |
NSDC / Skill India Certification | Useful for government schemes and subsidies |
OEM Certification (Samsung, Apple, etc.) | Increases job opportunities in branded centers |
🗣️ Bonus: Language & Customer Skill Helps
- Knowing regional languages (like Tamil, Hindi) helps in shop business
- Basic English and tech knowledge improves placement chances
- Good customer handling = better referrals and recurring clients
FAQs on Chip-Level Mobile Repair Course
🔹 3. What tools do I need to buy for practice?
You’ll need:
- Soldering iron & hot air gun
- Multimeter
- Microscope
- Jumper wire, flux, solder paste
(Optional: UFI Box or Easy JTAG for advanced work)
🔹 4. How long is the course duration?
🕒 Usually:
- 1-month crash course (fast track)
- 2–3 months full practical course (recommended)
🔹 5. Will I get a certificate?
✅ Yes, most training centers provide a completion certificate.
⭐ You can also get NSDC/Skill India certification if the center is affiliated.
🔹 6. What’s the income after completing this course?
- Job: ₹10,000–₹25,000/month
- Freelance/shop: ₹1,000–₹2,000 profit per phone
- Experienced: ₹30,000–₹50,000+ possible
🔹 7. Can I start my own repair shop after this course?
✅ Yes! After the course, you can handle most repairs confidently.
💼 Start small, and upgrade to chip-level lab as demand grows.
🔹 8. Is iPhone repair also taught in this course?
📱 Some advanced chip-level courses include iPhone logic board repair.
📍 Ask your institute if they cover iPhone CPU, NAND, Face ID repair.
🔹 9. Will this course cover software flashing and unlocking?
Yes — most full courses include:
- Flashing stock ROM
- FRP/Pattern unlock
- IMEI repair (for educational purposes)
🔹 10. Where can I join the course?
Top Indian training centers:
- Prizm Institute – Mumbai
- Hi-Tech Institute – Delhi
- MobiCare – Chennai
- Jetking / NSTI – multiple cities
ChatGPT said:
✅ Final Thoughts – Chip-Level Mobile Repair Course
The Chip-Level Mobile Repair Course is not just a technical training—it’s a powerful career gateway for anyone interested in working with smartphone hardware at a professional level. As mobile phones become more compact and complex, the demand for skilled chip-level technicians is growing rapidly. Chip-Level Mobile Repair Course This course offers everything you need: from understanding basic electronics to mastering advanced soldering, jumper techniques, and IC-level troubleshooting.
Whether you’re a fresher, an existing mobile repair technician, or someone planning to launch your own service center, the Chip-Level Mobile Repair Course will give you the hands-on experience and industry knowledge required to succeed. Chip-Level Mobile Repair Course You’ll learn how to diagnose and repair common issues like no power, no charging, audio problems, display faults, and even dead motherboard recovery. With access to real-time tools like multimeters, hot air stations, microscopes, and schematic reading software, you’ll be fully equipped to handle real-world repair challenges.
Chip-Level Mobile Repair Course By the end of the course, you’ll not only have a recognized certification but also the confidence to handle even the most complicated smartphone issues. In today’s tech-driven world, a skill like chip-level repair is not just useful—it’s highly profitable.
🚀 So if you’re serious about building a future in mobile technology, the Chip-Level Mobile Repair Course is your first step toward becoming a top-level technician. Enroll today, sharpen your skills, and start your journey into one of the most in-demand technical careers of the decade!
Smartphone Dead Issue? Full Board-Level Repair Steps
Smartphone Dead Issue? Full Board-Level Repair Steps 📱 Smartphone Dead Issue? Full Board-Level Repair Steps Complete chip-level diagnosis and fix guide for mobile technicians 🔍 Step 1: Basic…
Top 5 Multimeters Under ₹1000 for Beginners in India (2025) – Expert Guide
Top 5 Multimeters Under ₹1000 for Beginners (2025 Guide) Top 5 Multimeters Under ₹1000 (2025 Guide) Affordable, reliable multimeters for beginners, students & mobile technicians in India 1….
Introduction to Induction Stove Technology Easy Guide – 2025
Introduction to Induction Stove Technology 🔌 Introduction to Induction Stove Technology What is an Induction Stove? An induction stove, also known as an induction cooktop or induction hob,…
சிப்-லெவல் மொபைல் பழுதுபார்க்கும் படிப்பு – முழு வழிகாட்டி
சிப்-லெவல் மொபைல் பழுதுபார்க்கும் படிப்பு 🔧சிப்-லெவல் மொபைல் பழுதுபார்ப்பு என்றால் என்ன? சிப்-லெவல் மொபைல் பழுதுபார்ப்பு என்பது மொபைல் ஃபோனின் மதர்போர்டில் (லாஜிக் போர்டு) நேரடியாக பிழைகளைக் கண்டறிந்து சரிசெய்யும் செயல்முறையைக் குறிக்கிறது. இது ஐசிக்கள் (ஒருங்கிணைந்த சுற்றுகள்),…
Chip-Level Mobile Repair Course – Full Guide
🔧 What is Chip-Level Mobile Repair? Chip-level mobile repair refers to the process of diagnosing and fixing faults directly on the motherboard (logic board) of a mobile phone….
🛠️ Top Mobile Repair Issues Trending in 2025 – And How to Fix Them
🛠️ Top 5 Mobile Repair Issues in 2025 and How to Fix Them Like a Pro In 2025, smartphones have become more powerful than ever—offering advanced features, AI…
Top 10 Must-Have Mobile Repair Tools for Starters quick [2025 Guide]
Top 10 Must-Have Mobile Repair Tools for Starters [2025 Guide] 🛠️ Top 10 Must-Have Mobile Repair Tools for Starters (Beginner’s Guide). 🧑🔧 Introduction: Are you ready to begin…
சாதாரண மொபைல் பிழைகளை வீட்டிலேயே எளிதாக சரி செய்வது எப்படி? (Complete Guide).
📱 சாதாரண மொபைல் பிழைகளை வீட்டிலேயே எளிதாக சரி செய்வது எப்படி? (Complete Guide). 🔍 மொபைல் வேலை செய்யாமல் இருந்தால் உடனே சர்வீஸ் செஞ்சிடலாமா? இல்லை! பல மொபைல் பிழைகள் நாம் வீட்டிலேயே சரி செய்யலாம் –…
🛠️ Mobile Repair Basics: What Every Beginner Must Know
Mobile Repair Basics: 10 Powerful Tips Every Smart Beginner Should Know (2025 Ultimate Guide) mobile repair basics 🔧 Introduction In today’s digital world, mobile phones have become a…
T-Con Board Troubleshooting: Fixing Display and Picture Problems
T-Con Board Troubleshooting Guide 2025: Fix Display Problems Fast! T-Con Board Troubleshooting: Fixing Display and Picture Problems The T-Con Board (Timing Control Board) plays a crucial role in…
7 Essential LED TV & LCD TV Repair Technician Safety Tips for 2025
Safety Precautions Every TV Repair Technician Must Follow 7 Essential LED TV & LCD TV Repair Technician Safety Tips for 2025. TV repair technician safety tips If you’re…
Understanding LED TV & LCD TV technology: How They Work
Understanding LED TV & LCD TV technology: How They Work Introduction LED TV & LCD TV technology has revolutionized the television industry, offering improved picture quality, energy efficiency,…
Essential Tools and Equipment for LED/LCD TV Repair (2025) – Best TV Repair Tools Guide.
Essential Tools and Equipment for LED/LCD TV repair tools (2025) – Best TV Repair Tools Guide. Essential Tools and Equipment for LED/LCD TV repair tools. When repairing LED…
Introduction to LED TV Repair: A Step-by-Step Guide for Beginners.
Introduction to LED TV Repair: A Step-by-Step Guide for Beginners Introduction to LED TV Repair: A Step-by-Step Guide for Beginners (2025). LED TV repair guide Introduction Have you…
7 Reasons Your Amplifier Overheats & Easy Fixes to Stop It (2025).
Why is My Amplifier Overheating? Causes and Fixes. Introduction : Amplifier Overheating When an amplifier overheats, it can lead to performance problems, reduced lifespan, and even permanent damage….
How to Fix Distorted Sound in an Audio Amplifier (Ultimate Guide).
How to Fix Distorted Sound in an Audio Amplifier (Ultimate Guide) How to Fix Distorted Sound in an Audio Amplifier (Ultimate Guide) Distorted Sound in an Audio Amplifier…
How Audio Amplifiers Work: A Simple Guide for Beginners.
How Audio Amplifiers Work: A Simple Guide for Beginners. Introduction Have you ever wondered how your speakers produce loud and clear sound from a weak audio signal? The…
What is an Audio Amplifier? The Ultimate Beginner’s Guide to Sound Technology.
What is an Audio Amplifier? The Ultimate Beginner’s Guide to Powerful Sound Technology What is an Audio Amplifier? A Beginner’s Guide to Sound Technology Introduction An audio amplifier…
Ultimate CRT TV Microcontroller and EEPROM Repair Guide – Fix Like a Pro
Ultimate CRT TV Microcontroller and EEPROM Repair Guide – Fix Like a Pro! Introduction CRT TVs rely on CRT TV microcontroller and EEPROM (Electrically Erasable Programmable Read-Only Memory)…
How to Replace Faulty Capacitors in CRT TVs.
How to Replace Faulty Capacitors in CRT TVs. Introduction Faulty Capacitors in CRT TVs, though considered old technology, are still used in many households. One of the most…
Fix Low or Distorted Audio in CRT TVs – Ultimate Troubleshooting Guide
Fix Low or Distorted Audio in CRT TVs – Ultimate Troubleshooting Guide Introduction Having trouble with low or distorted audio in CRT TVs? This issue can be frustrating,…
CRT TV No Sound? Here’s the Repair Solution
CRT TV No Sound? Here’s the Repair Solution Introduction : A common issue with CRT TVs is the no sound problem.CRT TV No Sound This can be due…
CRT TV Screen Shrinking and Expanding – How to Fix
CRT TV Screen Shrinking and Expanding – How to Fix IntrIntroduction Is your CRT TV screen shrinking and expanding? This issue is common in older televisions and usually…
CRT TV Distorted Picture? Ultimate Troubleshooting Guide for Quick Fixes!
CRT TV Distorted Picture? Ultimate Troubleshooting Guide for Quick Fixes! CRT TV Distorted Picture? Ultimate Troubleshooting Guide for Quick Fixes! Fix blurry, warped, or flickering CRT TV displays…
CRT TV Color Issues: Fixing Red, Green, Blue Problems
CRT TV Color Issues: Fixing Red, Green, Blue Problems CRT TV Color Issues: Fixing Red, Green, and Blue Problems Easily introduction : CRT TV Color Issues: Fixing Red,…
How to Fix CRT TV No Display or Black Screen Issues
How to Fix CRT TV No Display or Black Screen Issues. Introduction CRT TVs are known for their durability, but over time, they may develop issues like no…
Complete Guide to CRT TV Fault Diagnosis and Repair
Complete Guide to CRT TV Fault Diagnosis and Repair. Introduction CRT TVs, though older technology, are still in use in many households. Diagnosing and repairing these TVs requires…
CRT TV Vertical Deflection Problems & Fixes
CRT TV Vertical Deflection Problems & Fixes introduction : CRT TV Vertical Deflection Problems & Fix CRT TV Vertical Deflection Problems – Cathode Ray Tube (CRT) TVs are…
Common CRT TV Power Supply Issues and How to Fix Them
Common CRT TV Power Supply Issues and How to Fix Them Introduction CRT TVs, although largely replaced by modern LCD and LED screens, are still used in many…
Troubleshooting Horizontal Deflection Issues
🛠️ Troubleshooting Horizontal Deflection Issues 📌 Introduction Horizontal deflection issues in CRT TVs and monitors can cause screen distortion, folding, or total horizontal collapse. These problems can be…
How to Test a CRT TV Flyback Transformer
🛠️ How to Test a CRT TV Flyback Transformer – Step-by-Step Guide 🔹 Introduction Test a CRT TV flyback transformer – The flyback transformer is one of the…
CRT TV Power Supply Issues: Troubleshooting & Fixes
CRT TV Power Supply Issues: Troubleshooting & Fixes 🔹 Introduction CRT TV Power Supply Issues (Cathode Ray Tube) TVs have a primary power supply section that converts AC…
How to Open a CRT TV Back Cover Safely in 5 Easy Steps
🛠️ How to Open a CRT TV Back Cover Safely – Step-by-Step Guide Want to open a CRT TV back cover safely without damaging components? This guide will…
Tamil Technicians – Your Ultimate Guide to Electronics & Tech Learning
Tamil Technicians – Your Ultimate Guide to Electronics & Tech Learning Introduction In today’s fast-growing tech world, electronics knowledge is more valuable than ever. Whether you’re an aspiring…
Audio Amplifier Service Training – Repair Guide & Troubleshooting Tips
Audio Amplifier Repair Training – Repair Guide & Troubleshooting Tips Common Audio Amplifier Problems and How to Fix Them No Sound from the Amplifier – Step-by-Step Troubleshooting Overheating…