How to Use This Book
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Who this book is for
This handbook is written for two readers at once:
- The instructor, who needs a structured, technically correct syllabus for teaching computer, laptop and smartphone repair, with lab exercises, assessment criteria and reference tables.
- The student, who wants to go from no experience to being able to diagnose and repair devices for paying customers, and then register and run a small repair shop.
The book assumes no prior electronics knowledge. It begins with safety and basic electrical theory, moves through tools and soldering, then covers each device category (desktop PCs, laptops, Android phones, iPhones) from the module-replacement level up to board-level (component) diagnosis. It ends with a full chapter on registering and operating a repair business in the Philippines.
How the book is organised
| Part | Chapters | What the student will be able to do |
|---|---|---|
| I — Foundations | 1–5 | Work safely, understand circuits and components, use a multimeter and bench power supply, solder and microsolder, follow a diagnostic method |
| II — Desktop Computers | 6–8 | Build, upgrade and troubleshoot PCs; install and recover operating systems; handle data safely |
| III — Laptops | 9–11 | Disassemble laptops; replace screens, keyboards, batteries, ports, hinges; diagnose motherboard power faults |
| IV — Smartphones | 12–16 | Open phones safely; replace screens, batteries, ports, cameras; flash/restore Android and iPhone; diagnose boards with a DC power supply |
| V — The Repair Business | 17–18 | Register a shop, price jobs, issue warranties, source parts, protect customer data, manage e-waste |
| VI — The Real Shop Toolkit | 19–22 | Buy the right equipment for each station, keep stock, follow step-by-step job cards, and use symptom-to-fix tables at the bench |
| Appendices | A–F | Quick-reference tables, printable forms, lab exercises, rubric, glossary |
How to read the pages
Every chapter starts with an In plain words box: the whole chapter in a few sentences. If you only remember one thing, remember that box. Inside the chapters, four kinds of boxes appear:
The simple version of the idea, without formulas.
Something that can hurt you, destroy the device, or get the shop into legal trouble.
A shortcut experienced technicians use every day.
What beginners most often get wrong, so you can avoid it.
At the end of every chapter: video links and official manuals, tools and websites for that chapter. All links are clickable; the Resource Directory at the back has QR codes for printed copies.
New to repair? Turn to “Start Here: Your First 30 Days” right after this introduction. It tells you what to buy, where to get practice devices, what to do each day, and which ten services to sell first.
The book has more than 50 illustrations: step-by-step picture sequences, labelled diagrams, flowcharts, and do/don’t comparisons. Learners who prefer pictures can follow the figures first and read the text afterwards. The drawings are simplified so the important part stands out. Real boards and phones differ between models, so always compare with the actual device and its service manual.
A word about accuracy
Electronics repair is a technical field, not a speculative one, and this book treats it that way. Throughout the text:
- Fixed physical facts (Ohm’s law, solder melting points, battery chemistry voltages, connector pinouts defined by published standards) are stated directly.
- Values that vary by model (exact voltages on a specific motherboard rail, the location of a particular chip, a particular phone’s screw lengths) are never invented. Where these matter, the book tells you how to find the correct value: the schematic, the boardview, the manufacturer’s service manual, or a measurement from a known-good unit.
- Typical ranges (for example, normal diode-mode readings, typical current draw at power-on) are labelled as typical and must always be compared against a known-good reference.
- Prices, laws and procedures that change over time (business registration, tax rules, Apple’s parts programmes) were checked against current sources as of November 2026. Always confirm with the agency or manufacturer before acting on them.
The golden rule of repair: Measure, don’t guess. Compare with known-good. Document everything. A technician who replaces parts at random is not repairing — they are gambling with the customer’s device and money.
Suggested course schedule
The material fits a 12-week (approximately 240-hour) programme at about 20 hours per week, comparable in scope to TESDA’s Computer Systems Servicing NC II plus additional mobile-device and board-level content. A suggested breakdown:
| Week | Topic | Lecture hrs | Lab hrs |
|---|---|---|---|
| 1 | Safety, ESD, electrical fundamentals (Ch. 1–2) | 8 | 12 |
| 2 | Components, schematics, multimeter mastery (Ch. 2–3) | 6 | 14 |
| 3 | Soldering and microsoldering (Ch. 4) | 4 | 16 |
| 4 | Troubleshooting method; PC architecture and assembly (Ch. 5–6) | 6 | 14 |
| 5 | PC troubleshooting; OS install, recovery, data (Ch. 7–8) | 6 | 14 |
| 6 | Laptop architecture and disassembly (Ch. 9–10) | 5 | 15 |
| 7 | Laptop board-level diagnosis (Ch. 11) | 6 | 14 |
| 8 | Smartphone architecture; opening techniques (Ch. 12–13) | 5 | 15 |
| 9 | Screen, battery, port, camera repairs (Ch. 13) | 4 | 16 |
| 10 | Android and iOS software, flashing, restore (Ch. 14–15) | 6 | 14 |
| 11 | Phone board-level repair; liquid damage (Ch. 16) | 5 | 15 |
| 12 | Business setup and shop operations; final practical exam (Ch. 17–18) | 8 | 12 |
Each chapter ends with Review Questions and Lab Exercises. Appendix D contains a practical assessment rubric.
Legal and ethical boundaries
Repair technicians are trusted with people’s most private devices. This book teaches repair, not circumvention. It does not teach:
- Removing Apple Activation Lock, Google Factory Reset Protection (FRP), or similar anti-theft locks from devices whose ownership you cannot verify.
- Changing or “repairing” IMEI numbers. Altering a phone’s IMEI is illegal in many jurisdictions and is a tool of phone theft.
- Accessing customer data beyond what a repair strictly requires.
A shop that does these things will eventually receive stolen goods, lose its reputation, and face legal liability. Chapter 18 explains the intake procedures that protect you.