04/08/2026
Here is the comprehensive job-oriented chip-level mobile phone repair training curriculum provided by KSS Infotech Training Institute, covering hardware schematics, diagnostic techniques, component replacement, and software flashing across iOS, Android, and Windows mobile platforms.
KSS INFOTECH
KSS INFOTECH — JOB-ORIENTED TRAINING INSTITUTE
Complete Mobile Phone Chip-Level Hardware & Software Repair Certification
Contact / Downloads Hotline: +91-98451 86383 / +91-94483 32382
KSS INFOTECH
Location: R.T. Nagar / Shivajinagar, Bengaluru, India
KSS INFOTECH
Session 1: Fundamentals of Mobile Hardware & Circuit Board Testing
Endorsed by: KSS Infotech Job-Oriented Training Institute
1. Primary Component Identification & Diagnostics
PCB Layout Mapping: Identifying Main ICs (Power Management IC / PMIC, CPU, eMMC/UFS Storage, Audio IC, RF PA IC) and passive SMD components (Resistors, Capacitors, Diodes, Inductors).
KSS INFOTECH
DC Power Supply Diagnostics:
0mA Draw: Open circuit, blown fuse, or broken battery connector line.
Low Current Draw (10mA – 50mA): Initializing fault (PMIC failure, crystal oscillator issue, corrupted boot sequence).
High Current Draw (500mA – 2A+): Direct VPH_PWR / VBAT short circuit on the motherboard.
2. Digital Multimeter Testing Modes
Diode Test Mode (Forward/Reverse Bias): Measuring Impedance / Ground Resistance (GR) values on signal lines to locate broken traces or leaky components.
Continuity Mode: Testing trace connectivity across circuit paths.
DC Voltage Measurement: Verifying active LDO output lines and Buck converters during bootup.
Session 2: Dead Mobile Phone Troubleshooting
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
Step-by-Step Diagnostic Sequence
Cold Testing (Power OFF):
Measure GR on battery connector terminals (VBAT, BSI/BAT_TEMP, GND).
Check main power rails (VPH_PWR / SYS_PWR) for direct shorting to ground.
Hot Testing (Power ON):
Connect DC power supply unit (4.2V, 3A-5A limit).
Check trigger response on pressing the Power Button (PWRKEY).
Measure reference voltages: VREG_LDO outputs (1.8V, 1.2V, 2.8V, 0.8V to CPU/RAM).
Boot Loop vs. Dead CPU/RAM:
Differentiate hardware dead conditions from firmware corruptions (EDL/DFU mode detection via USB PC connection).
Session 3: Board Short Circuit Testing Methods & Shorted IC Detection
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
┌──────────────────────────────────────────┐
│ Measure Impedance at Battery Connector │
└────────────────────┬─────────────────────┘
│
┌──────────────────┴──────────────────┐
▼ ▼
[Direct Short On VPH/VBAT] [Secondary Line Short]
│ │
Apply Thermal Rosin/Flux Inject Low Voltage (1.0V-1.8V)
│ │
Inject Current (4.2V / 3A) Observe Melting Rosin / Heat
│ │
└──────────────────┬──────────────────┘
│
▼
┌──────────────────────────────────────────┐
│ Remove Faulty Component via Hot Air Rework│
└──────────────────────────────────────────┘
Advanced Short Finding Methods
Rosin Flux V***r Method: Coat the suspect section of the PCB with dense rosin smoke. Inject low voltage into the shorted rail. The failing component heats up immediately and melts the rosin layer.
Short Killer / Current Injection: Inject current matching line parameters (1.0V – 4.2V max) to isolate failing decoupling capacitors without damaging sensitive silicon ICs.
Thermal Imaging Diagnostics: High-resolution thermal cameras pinpoint micro-amp leakage in secondary power lines.
Session 4: Charging Fault Solutions & USB Circuit Analysis
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
Common Charging Issues & Solutions
Slow Charging / "Fake Charging" Symbol: Damaged CC1/CC2 lines (Type-C PD negotiation failure), degraded charging IC, or faulty battery ID line resistor.
Over-Voltage Protection (OVP) Bypass: Isolating bad OVP ICs and safely bypassing input lines when replacement parts are unavailable.
USB Thermal Warning / Moisture Detected: Cleaning or replacing thermistor lines (TEMP_IN) and repairing corrosion near sub-board connectors.
Session 5: Micro-Soldering, BGA Reballing & Display Replacement
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
IC Removal and Reballing Protocol
Heat Management: Set SMD Hot Air Rework Station to ~330°C – 360°C (depending on leaded vs. lead-free solder) with controlled airflow.
KSS INFOTECH
Pad Cleaning: Apply flux and use copper solder braid with a chisel tip iron to flatten motherboard pads.
Stencil Reballing: Align BGA stencil, apply solder paste (183°C or 138°C low-melt), and apply uniform heat to reform BGA solder balls.
Display & Touch Repair Techniques
No Light vs. No Display: Distinguish missing backlight supply voltage (VBL_BOOST up to 20V–35V) from missing image data (MIPI differential lines).
OLED / AMOLED Separation: Frame disassembly and digitizer glass separation using vacuum heating separators and molybdenum wire.
Session 6: Schematic Diagram Reading & Tracing Level Repairs
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
Professional Tools & Schematics (ZXW, Borneo Schematics, Refox)
Block Diagrams: Tracing power distribution path from Charger IC → OVP → PMIC → Sub-PMIC → SoC.
Bitmap Tracing: Locating hidden motherboard trace vias, open circuits, and under-fill CPU connections.
Signal Line Verification:
I2C / SPI Bus Lines: Checking pull-up resistors (typically 2.2k$\Omega$) and voltage rails.
EN / RESET Lines: Verifying enable signals from CPU to peripheral controllers.
Session 7: OS Flashing & Software Unlocking Methods
Endorsed by: KSS Infotech Job-Oriented Training Institute
IndiaMART
1. Android Brand Flashing (Samsung, Xiaomi, Vivo, Oppo, Realme, OnePlus)
Modes: Fastboot Mode, Recovery Mode, Emergency Download Mode (EDL 9008 via test point).
Flashing Tools: Odin (Samsung), SP Flash Tool (MediaTek SoC), Mi Flash Tool (Qualcomm SoC), UnlockTool / Pandora / Hydra Dongle.
Fixes: Stalled boot loops, IMEI repair / NVRAM restore, FRP (Factory Reset Protection) bypass, unbricking dead software states.
2. Apple iOS Diagnostics & Flashing
Modes: Recovery Mode, DFU (Device Firmware Update) Mode.
Flashing Tools: Apple Configurator / iTunes, 3uTools.
Error Code Solutions:
Error 4013 / 4014: NAND flash memory hardware failure or baseband supply fault.
Error 9 / 14: Storage full boot loop or corrupted USB communication trace.
Error 3194: Firmware signing verification failure.
Training Course Contact & Download Details
Institute Name: KSS Infotech Job-Oriented Training Institute
Courses Available: Smart Mobile Phones Chip-Level Training, Laptop/Desktop Motherboard Repair, Home Study Video/CD Modules, and Hands-on Practical Workshops.
KSS INFOTECH
Helpline Numbers for Downloads & Enrollment:
Mobile / WhatsApp: +91-98451 86383
KSS INFOTECH
Alternate Mobile: +91-94483 32382
KSS INFOTECH
Landline: 9845186383
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Email: [email protected]
KSS INFOTECH
Main Center: No. 9a, 2nd Floor (Next to Sarah Ladies PG), R.T. Nagar Main Road End, Bangalore - 560032, Karnataka, India.
KSS INFOTECH
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