Learn board-level repair
Repair guides — page 9
Practical, bench-tested guides: reading schematics, using boardview software, BIOS programming, power circuits and step-by-step diagnostics. Each guide explains what to measure, in what order and why.
- Multimeter
Continuity Testing: Finding Breaks in Traces, Cables and Connectors
How to use continuity mode on laptop boards: checking traces, vias, flex cables and connectors, catching intermittent breaks, and when a beep misleads you.
- Components
Common Laptop Motherboard ICs and What They Do
The ICs you find on every laptop motherboard — PCH, EC, BIOS flash, charger, PD and voltage controllers, codec, LAN and more — what each does and how it fails.
- Tools
Cleaning Laptop Boards: Isopropyl Alcohol and Ultrasonic Cleaners
How to clean laptop boards safely: isopropyl alcohol purity, brushing off flux and corrosion, when an ultrasonic cleaner helps, what to remove and drying.
- Tools
Choosing a Soldering Iron for Board Repair
How to choose a soldering iron for laptop board repair: station types, cartridge tips, heat recovery, temperature control, tip shapes, hot tweezers and tip care.
- Diagnostics
Charger LED Goes Off When Plugged In: Finding the Short on DCIN
Why a laptop charger's LED goes off when plugged in: a short on the input rail, and how to find it — TVS diodes, input capacitors and MOSFETs, and the DC jack.
- BIOS
How to Read and Write a BIOS Chip with a CH341A Programmer
Step by step: read, verify, back up and write a laptop BIOS chip with a CH341A, including clip versus desoldering, the 5 V data-line issue and common errors.
- BIOS
CH341A Cannot Detect the Chip: Causes and Fixes
CH341A cannot detect the chip? Common causes: clip contact and orientation, 1.8 V chips, the board loading the supply, drivers, software and the programmer.
- BIOS
CH341A 1.8V Adapter: When You Need It
When a 1.8 V adapter is required for a CH341A programmer, how to identify 1.8 V SPI flash chips, how the adapter works and how to check it before trusting it.
- Power Circuits
Buck Converters on Laptop Boards: How a Rail Is Made
How buck converters make laptop power rails: switching, inductor and capacitors, synchronous MOSFETs, control modes, light-load behaviour, protection and failures.
- Boardview
Using Boardview Software on Mac and Linux
How to run boardview viewers on macOS and Linux: native OpenBoardView and FlexBV builds, Windows-only tools under Wine or a VM, and how to keep it safe.
- Boardview
Boardview File Won't Open: Common Errors and Fixes
Why a boardview file refuses to open — wrong viewer, unsupported variant, broken archive, encoded FZ, design file — and a step-by-step routine to fix it.
- Boardview
Boardview File Formats Compared: BRD, BDV, FZ, CAD, TVW, ASC
Laptop boardview formats compared — BRD, BDV, FZ, CAD, TVW, ASC and others: where each comes from, which viewer opens it and how to identify a file.
- Reading Schematics
Block Diagrams in Laptop Schematics: Where to Start
How to read the block diagram on the first pages of a laptop schematic: CPU, PCH, buses, controllers and page references, and how to use it to narrow down a fault.
- BIOS
BIOS File Formats: .bin, .rom, .cap and .fd Explained
What .bin, .rom, .cap, .fd and vendor BIOS files actually contain, which can be written to a chip with a programmer, and how to extract a usable image from the rest.
- BIOS
BIOS Dump vs Clean BIOS: What's the Difference
What a BIOS dump from another laptop contains, what a clean BIOS image is, why it matters for the ME region, serial numbers and passwords, and which to use when.
- BIOS
8 MB, 16 MB or 32 MB: Matching the BIOS Dump to the Chip
Matching a BIOS file to its chip: 8, 16 and 32 MB flash sizes, why update files and dumps differ, region-only files, capsule headers and split two-chip images.
- Tools
Bench Power Supply for Laptop Repair: How to Inject Voltage
How to use a bench power supply on laptop boards: choosing one, connecting it, reading current draw, and injecting voltage safely to make a shorted part warm up.
- Power Circuits
The Laptop Battery Connector and SMBus Explained
The laptop battery connector and SMBus explained: power, thermistor and presence pins, how the EC talks to the battery's fuel gauge, and diagnosing faults.