mobile repair issues 2025,Chip-Level Mobile Repair Course

🔧 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:

FeatureDescription
🧩 Micro Component RepairInvolves soldering or replacing tiny chips like PMIC, CPU, eMMC, Audio IC, etc.
🔬 Advanced Tools RequiredHot air gun, rework station, microscope, multimeter, DC power supply.
📊 Circuit-Level DiagnosisUses voltage testing, line tracing, and schematic reading to find faults.
⚠️ Handles Complex FaultsSolves “no power”, “dead phone”, “no charging”, “no network”, “auto restart”, etc.
🛠️ Not Just Part ReplacementGoes beyond battery/screen swaps — works at the electronic component level.

🧰 What’s Usually Repaired at Chip Level?

Battery Replacement Process, mobile issues repair 2025
  • 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?

  1. Cost-effective: Saves expensive boards from being replaced.
  2. High demand: Many phones become unusable due to motherboard-level issues.
  3. Career opportunities: Skilled chip-level technicians are always in demand.
  4. 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:

GroupWhy It’s a Good Fit
🧑‍🔧 Existing Mobile TechniciansUpgrade 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 SeekersHigh job potential in mobile service centers, especially in chip-level labs.
👩‍💻 Tech EnthusiastsLearn how smartphones work internally and how to fix advanced issues.
💼 EntrepreneursStart your own mobile chip-level service business or lab.
📱 Mobile Shop OwnersAdd 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

ToolPurpose
🔍 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 SupplyTo power the motherboard directly for testing without battery.
🧼 Ultrasonic CleanerCleans motherboards from water damage, corrosion, and dust.
🧊 PCB Holder / JigHolds the motherboard firmly during repair.
💡 Backlight TesterTests display and backlight circuits on LCDs.
🧲 BGA Reballing KitUsed to reball and reattach BGA-type ICs.
🔬 Flux & Solder PasteEnsures strong and clean solder joints.
🧵 Jump Wires & UV MaskFor 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

how to learn chip level mobile repairing

📚 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)
T-Con Board Troubleshooting, mobile motherboard repair training

🔰 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

TypeDescription
Single-layer PCBBasic, used in feature phones
Double-layer PCBCommon in mid-range smartphones
Multi-layer PCBHigh-end phones (e.g. iPhone, Samsung)

3. Main Components on Motherboard

ComponentFunction
🔲 IC (Integrated Circuit)Controls various operations like power, network, audio
🔌 Battery ConnectorConnects battery power to the board
🟡 Coils & CapacitorsFilter and regulate voltage
⚙️ ResistorsControl current flow in specific paths
📶 AntennasSignal 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.


phone PCB repair guide

🧠 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

ToolUse
🔥 Hot Air Gun / SMD Rework StationTo heat and remove ICs or micro components
🪛 Soldering Iron (Fine Tip)To manually solder jumpers and small parts
🧴 Flux & Solder PasteFor 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 HolderPrecision 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

ProblemPossible Cause
❌ No PowerFaulty PMIC, battery dead, main line short
🔁 Auto RestartPower IC heating, unstable 1.8V/3.0V supply
🔋 Not ChargingCharging IC or PMIC failure
🔥 Heating IssueShort 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

  1. Use hot air gun to remove the PMIC
  2. Clean PCB pads using solder wick
  3. Apply fresh solder paste
  4. Place new PMIC and reheat evenly
  5. 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

ProblemLikely Cause
🔌 Not ChargingBroken USB port, faulty charging IC
🐢 Slow ChargingBad cable, filter damage, low voltage path
⚠️ Charging Paused / Temp HighFaulty thermistor or charging IC
🔋 Charging Symbol but No IncreaseFake charging due to damaged power line
❌ Fast Charging Not WorkingData 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

ComponentFunction
RF ICHandles radio frequency (2G/3G/4G) signal transmission
PA IC (Power Amplifier)Boosts signal before sending to antenna
Switch IC / FEM ModuleSelects signal path between transmit and receive
Baseband IC / CPUHandles IMEI, encryption, and modem protocol
SIM IC / SIM SocketDetects SIM card and communicates with network

🧠 Common Network Problems Chip-Level Mobile Repair Course

IssueProbable Cause
📴 No SIM DetectedFaulty SIM IC, dirty/damaged SIM socket
🚫 No Signal / Emergency CallsRF IC or PA IC issue
🆔 Invalid IMEI / Null IMEICorrupted baseband data or CPU fault
🔁 Network FluctuationDry solder on RF section, faulty antenna switch
🈚 Signal in One Band OnlyBand 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

ComponentFunction
Audio IC / Codec ICControls all sound input/output (mic, speaker, etc.)
EarpieceAllows you to hear during a call
Mic (Microphone)Captures your voice during calls/recordings
LoudspeakerPlays media/ringtones
Audio Filters/CoilsProtect and stabilize audio lines
Sensor IC / Proximity SensorDetects light or nearby objects (used during calls)

🧠 Common Audio & Sensor Problems Chip-Level Mobile Repair Course

IssueLikely Cause
🎙️ Mic not workingFaulty mic, mic line break, audio IC issue
🔇 No sound in callEarpiece or codec IC problem
📢 Loudspeaker not workingDry solder, damaged speaker or filter
🔁 Sound only on one sideHalf short in audio lines or damaged IC
🔦 Auto screen off during call not workingProximity sensor faulty
🌗 Auto brightness not workingLight 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

ComponentFunction
Display Connector (FPC)Connects the LCD/touch flex to the motherboard
Touch IC / Digitizer ICManages input from touchscreen
Backlight IC / LED DriverSupplies power to the screen’s backlight
Filter Coils & CapacitorsSmooth power and signal lines
EMI FiltersPrevent signal interference (used for touch & data lines)

🧠 Common Display/Touch Problems

IssueCause
⚫ No Display / Black ScreenDamaged display, connector issue, backlight IC fault
👆 Touch Not WorkingFaulty touch IC, broken touch lines
⚡ Flickering or Dim DisplayDamaged backlight filter or IC
❌ Half Screen WorkingPartial signal line damage or connector issue
🔁 Auto touch / Ghost touchMoisture, 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

ToolPurpose
🔬 MicroscopeEssential for viewing micro points
🧵 0.1mm Copper Jumper WireUsed to connect broken pads or tracks
💡 UV Solder Mask & UV LightFor protecting and fixing jumper points
🪛 Soldering Iron (Fine Tip)To place jumpers precisely
🔥 Hot Air GunUsed for nearby component soldering
📚 ZXW/Wuxinji ToolFor identifying track endpoints and IC pin maps

🔎 Common Jumper Cases You’ll Encounter

FaultJumper Fix
❌ SIM Not DetectedJumper SIM_CLK, SIM_DATA, SIM_RST lines
🔌 Charging Not WorkingJumper VBUS or USB D+/D- lines to charging IC
📱 No Display / TouchJumper missing VCC or data lines from connector to IC
🔊 No AudioJumper audio output lines from IC to speaker area
🔋 Battery Not DetectedJumper BSI, BSI_GND, or NTC lines to PMIC

⚙️ Step-by-Step Jumper Process

  1. Identify Broken Track using ZXW or multimeter
  2. Clean both ends of the track (pad and destination)
  3. Apply flux, then solder jumper wire carefully
  4. Route the jumper wire securely (avoid loose or floating wire)
  5. Cover jumper with UV solder mask and cure with UV light
  6. 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?

TypeDescription
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

SymptomLikely Cause
⚫ Dead phone / No booteMMC/UFS corrupt or detached
🔁 Bootloop / Stuck on logoDamaged system partitions
❌ Cannot flash firmwareMemory IC is read/write protected or bad
🔄 Auto restarteMMC wear-out or data corruption
🆔 Null IMEIBaseband/NV data inside eMMC lost or corrupt

🛠️ Tools Used for eMMC/UFS Work in Chip-Level Mobile Repair Course

ToolPurpose
🔧 UFI Box / Easy JTAG PlusRead/write/dump eMMC/UFS data
🔥 Hot Air StationFor removing/resoldering memory IC
🧼 Flux, Solder Paste, StencilsFor cleaning and reballing BGA pads
🔬 MicroscopeFor precise IC placement and soldering
📀 Firmware Dump FilesUsed 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

RoleWhere You Can Work
🧑‍🔧 Mobile Chip-Level TechnicianBranded or multi-brand service centers
🧰 Service Center StaffSamsung, Vivo, Oppo, Xiaomi, Realme, etc.
🖥️ PCB Repair ExpertRefurbishment labs or used phone warehouses
🔧 Freelance TechnicianHome service / door-step repair support
🎓 Technical InstructorTraining centers and polytechnic institutes

💼 Average Salary in India (2025)

Experience LevelSalary 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

CertificationBenefit
Local Training Center CertificateValid for private jobs or self-employment
NSDC / Skill India CertificationUseful 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!


சிப்-லெவல் மொபைல் பழுதுபார்க்கும் படிப்பு

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),…

Read More
மொபைல் பிழைகள் சரி செய்வது

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 –…

Read More
Troubleshooting Horizontal Deflection Issues

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…

Read More

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top