Learn board-level repair
Repair guides — page 8
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.
- Tools
Flux, Solder and Wick: Consumables for Board Repair
The consumables of board repair explained: flux types, leaded, lead-free and low-melt solder, solder paste, wick and cleaning alcohol, and how to use each well.
- Boardview
FlexBV vs OpenBoardView vs Other Viewers: Which to Use
OpenBoardView, FlexBV and older boardview tools compared on formats, schematic linking, platforms and cost, with advice on which one fits your repair work.
- BIOS
Using flashrom on Linux to Read a Laptop BIOS Chip
Using flashrom on Linux to read, verify and write a laptop BIOS chip: installing it, CH341A and other programmers, chip selection, regions and common errors.
- Diagnostics
Finding Shorts with Freeze Spray, Thermal Camera and Rosin
Three ways to spot the shorted part on a laptop board during voltage injection — thermal camera, freeze spray and rosin — and when each one works best.
- Components
Shorted Capacitors on Laptop Boards: How to Find Them
How to find a shorted capacitor among dozens on a laptop rail: splitting the rail, millivolt drop mapping, injection, visual clues and safe removal.
- Boardview
Finding Component Locations Fast with Boardview Search
Search techniques that make boardview work fast: designators, net names, partial matches, pin lookups and how to go from the screen to the right spot on the board.
- Reading Schematics
Feedback Resistors: Working Out a Rail Voltage from the Schematic
Work out what voltage a laptop regulator should produce from its feedback resistors: finding Vref, the divider formula, selectable outputs and pitfalls.
- Diagnostics
External Monitor Works but the Laptop Screen Is Black
External monitor works but the laptop screen is black: separating backlight from image faults, panel power, eDP signals, cables, lid sensors and the display path.
- Tools
Essential Tools for Laptop Motherboard Repair
The essential tools for laptop motherboard repair, in the order to buy them: multimeter, bench supply, microscope, soldering and hot air, consumables and BIOS tools.
- Power Circuits
Enable Signals in Laptop Power Sequencing
How enable signals switch on laptop power rails: where they come from, SLP_S3 and SLP_S4, active-low logic, RC delays, and how to trace an enable that never arrives.
- Power Circuits
The Embedded Controller (EC): What It Does
What a laptop's embedded controller does: power button, power sequencing, charging, keyboard, fans and LEDs, where its firmware lives, and how to check a dead EC.
- BIOS
EC/KBC Firmware: The Second BIOS in Your Laptop
What laptop EC firmware does, where it is stored (internal flash, its own SPI chip or the BIOS chip), how corruption shows up and how it is reprogrammed.
- Components
Diodes and TVS Diodes on Laptop Boards
Diodes and TVS diodes on laptop boards: where they sit and why, Schottky, Zener, TVS and ESD arrays, the ratings that matter for replacements, and typical failures.
- Tools
Diode Mode Measurements Explained
Diode mode on laptop boards: the red-to-ground convention, what readings mean for rails and data lines, short and open values, and comparing with references.
- Brands
Desktop Motherboard Repair for Laptop Technicians
Desktop motherboard repair for laptop technicians: ATX power and standby, the Super I/O instead of an EC, VRMs, BIOS recovery features, POST codes and faults.
- Brands
Dell Laptop Motherboard Identification Guide
How to identify a Dell laptop motherboard: Dell part numbers and PPID labels, ODM board codes from Compal, Quanta and Wistron, revisions, and diagnostic LED codes.
- Components
Current Sense Resistors in Laptop Charging Circuits
Current sense resistors in laptop charging circuits: where they sit, Kelvin sense lines and filters, how a damaged shunt misleads the charger and how to check one.
- Components
Crystals and Clock Problems on Laptop Boards
Crystals and clock problems on laptop boards: which chips need a crystal, how oscillators fail, measuring clocks safely and choosing a replacement.