Chapter 4 - Introduction to Preventive Maintenance
Learn what is preventive maintenance, 6 steps of PC troubleshooting process, common hardware problems, and solutions with video tutorials.
2026-08-20 · 3 min read
Hello my friend! Today we learn together Chapter 4: Introduction to Preventive Maintenance with simple step-by-step explanation and video tutorials in Khmer language! Hope you learning this lesson and get more knowledge from this! Let's enjoy it!
If you want to see all lessons list, check out All Chapters of Computer Fundamentals! Now let's get started!
1. What is Preventive Maintenance?
Preventive Maintenance means regularly cleaning, servicing, checking, and updating computer hardware & software BEFORE it breaks down!
Benefits of Preventive Maintenance:
- Extends Lifespan : Computer parts live much longer when clean and cool!
- Prevents Overheating : Removing dust from CPU fan keeps temperature low.
- Improves Speed & Stability : Deleting junk files and updating software keeps system running fast.
- Reduces Repair Costs : Cleaning computer costs $10, but replacing burned CPU costs $200!
Essential Maintenance Tasks:
- Clean Dust : Use compressed air can to blow out dust from CPU cooler, GPU fans, and power supply.
- Check Cables : Ensure SATA cables and power connectors are plugged tightly.
- Software Cleanup : Run Disk Cleanup, scan for viruses, and update Windows OS drivers.
⚠️ Maintenance Warning: Never hold compressed air can upside down while spraying inside PC! Liquid propellant can freeze and crack delicate electronic circuit boards!
💡 Pro Tip: Clean dust inside your computer case once every 3 to 6 months to stop CPU fan noise and prevent thermal throttling slowdowns!
Watch Video Tutorial (Part 1: Preventive Maintenance Guide)
2. The 6-Step Troubleshooting Process
When a computer stops working, professional technicians follow this official 6-step troubleshooting methodology:
- Identify the Problem : Ask user questions (What happened? Any error message on screen?).
- Establish a Theory of Probable Cause : Guess most logical cause (Is RAM loose? Is PSU cable unplugged?).
- Test the Theory : Test your guess (Reseat RAM stick or swap with working power supply).
- Establish a Plan of Action & Implement Solution : Fix the problem step-by-step.
- Verify Full System Functionality : Turn on PC and test if problem is 100% solved.
- Document Findings & Outcome : Write down what went wrong and how you fixed it in repair journal!
💡 Pro Tip: Always test simple causes first (e.g. check if power cord is plugged into wall socket) before taking apart the whole computer!
3. Common PC Problems & Easy Solutions
- No Power (PC won't turn on) : Check wall outlet, main PSU switch behind case (I/O switch), and 24-pin motherboard power cable.
- PC Turns On but No Display : Reseat RAM sticks (clean gold contacts with pencil eraser) or check GPU card.
- Computer Overheats & Shuts Down : Clean dust from CPU fan and re-apply fresh thermal paste.
- Blue Screen of Death (BSOD) : Bad RAM memory stick, corrupted Windows driver, or failing hard drive.
Watch Video Tutorial (Part 2: Troubleshooting PC Problems)
💡 Want to learn more? Check full lesson list here: All Chapters of Computer Fundamentals!
Happy maintaining and fixing computers, my friend!