Laptop hardware you can monitor and replace
Laptops pack the same parts as a desktop into a thin case. That makes most parts smaller, many of them proprietary, and some of them soldered to the motherboard where they cannot be replaced at all. Objective 1.1 asks you to watch the health of mobile hardware and to choose the right way to replace a part.
Before you open anything, confirm three facts: the exact model number, whether the part is replaceable on that model, and whether a warranty or service contract covers the repair. If it does, the manufacturer's service is usually the right route, because damage caused during your own repair may not be covered.
- 1Back up the user's data if the work touches storage, and note the current configuration.
- 2Find the manufacturer's service manual for the exact model. It shows screw locations, cable routing and the correct replacement part number.
- 3Shut down, unplug the AC adapter, and disconnect the internal battery connector before touching anything else.
- 4Wear an ESD strap or touch grounded metal, and work on an ESD mat.
- 5Photograph cables and keep screws in order as you remove them. Screws are often different lengths, and a long screw in the wrong hole can puncture a battery or crack a board.
- 6Install the new part, reconnect the battery last, and test before you fully close the case.
- 7Record the part, serial numbers and the result in the ticket.
| Component | What to monitor | Replacement notes |
|---|---|---|
| Battery | Health or capacity percentage, cycle count, swelling, charge that drops quickly | Lithium-ion. Use the manufacturer's part. A swollen battery is a fire hazard: stop using the device and recycle the battery as hazardous waste. |
| Keyboard/keys | Sticky or dead keys, liquid damage | Single keycaps can often be replaced. On many thin laptops the keyboard is riveted into the palm rest, so the whole top case is replaced. |
| RAM | Installed memory compared with what the user runs | Laptops use SODIMM modules. Check how many slots there are and the maximum supported. Many thin laptops have RAM soldered to the board, which cannot be upgraded. |
| HDD/SSD | S.M.A.R.T. status, free space, slow startup | 2.5-inch SATA drives or M.2 SSDs. Confirm whether the M.2 slot takes SATA, NVMe or both, and the length (2280 means 22 mm wide and 80 mm long). Clone or back up before the swap. |
| Wireless card | Wi-Fi or Bluetooth drops, adapter missing in Device Manager | Usually an M.2 card. Reconnect the antenna leads (often labeled main and aux) to the correct terminals. |
| Physical privacy and security components | Fingerprint reader or face camera not recognized | Biometric readers, near-field (NFC) scanners for badges or payments, webcam privacy shutters. |
| Wi-Fi antenna connector/placement | Weak signal compared with nearby devices | Antennas usually run around the display bezel, the highest point of an open laptop. |
| Camera/webcam and microphone | Not detected, black image, no sound in calls | Usually built into the display bezel. Check the privacy shutter or switch and the operating system's privacy settings before replacing hardware. |
A favorite exam scenario: the screen was just replaced and now Wi-Fi is weak. The antenna leads run through the display hinge, so check that they were reconnected and not pinched.
Biometrics such as fingerprint readers and infrared face-recognition cameras (for example Windows Hello) store a mathematical template, not a photo. They replace typing a password or act as a second factor. Near-field scanner features let a laptop or phone read an NFC badge or make a tap payment within a few centimeters.
Before ordering a part, look up the model's service manual and parts list. Questions such as SODIMM or DIMM, SATA or NVMe M.2, and 2.5-inch or 3.5-inch drive are answered there.
Word bank
All definitions →- Biometrics
- Identifying a person by a physical trait such as a fingerprint or face.
- Cycle count
- How many full charge cycles a battery has gone through; capacity falls as it rises.
- ESD
- Electrostatic discharge: static electricity that can damage components without any visible sign.
- M.2
- A small card form factor for SSDs and wireless cards; an M.2 SSD can use SATA or NVMe.
- SODIMM
- Small outline dual in-line memory module: the smaller RAM module used in laptops and small PCs.
Knowledge check
After a technician replaces a laptop screen, the user reports the Wi-Fi signal is much weaker than before. What should the technician check first?
A user wants more memory in a laptop that has an open slot. Which module type should you buy?
A laptop's battery is visibly bulging and pushing the touchpad up. What is the right action?