Multimeter guides
How to use a multimeter on a laptop board: every mode, every common component, and what the readings mean.
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Multimeter Modes and Symbols Explained
What each symbol on a multimeter dial and display means — volts, ohms, diode, continuity, capacitance, current, REL, HOLD, MIN/MAX — and which ones repair needs.
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Multimeter Mistakes That Damage Laptop Boards (and How to Avoid Them)
The multimeter mistakes that damage laptop boards or mislead diagnosis: probe slips, current mode on rails, measuring powered boards in ohms, poor grounds and more.
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Laptop Motherboard Components: How to Recognise Each One and What to Measure
A field guide to the parts on a laptop board — resistors, capacitors, inductors, diodes, MOSFETs, ICs, crystals, fuses — with how to spot each and what to measure.
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How to Use a Multimeter on a Laptop Motherboard: A Beginner's Guide
A beginner's guide to using a multimeter on laptop boards: jacks and modes, powered and unpowered measurements, reading the display, and a first diagnosis.
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How to Test Inductors and Ferrite Beads with a Multimeter
How to check inductors and ferrite beads on a laptop board with a multimeter: continuity, opens, the switch node, using beads to split rails, and their limits.
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How to Test a Transistor with a Multimeter: BJT and MOSFET
How to test BJTs and MOSFETs with a multimeter: junction and body-diode readings, the gate-charge trick out of circuit, and in-circuit comparison on laptop boards.
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How to Test a Thermistor with a Multimeter
How to test NTC and PTC thermistors on a laptop board with a multimeter: room-temperature readings, the warm-up test, in-circuit traps and what a bad one causes.
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How to Test a Resistor with a Multimeter (In and Out of Circuit)
How to check SMD resistors on a laptop board with a multimeter: in-circuit vs out-of-circuit readings, marking codes, very low values and common faults.
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How to Test a Laptop Charger with a Multimeter
How to check a laptop charger with a multimeter: barrel plug polarity, output voltage, the ID pin, loaded vs unloaded tests, and why USB-C chargers read 0 V.
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How to Test a Laptop Battery with a Multimeter Safely
How to test a laptop battery with a multimeter safely: pack voltage, connector pinout, protection mode, thermistor and SMBus pins, and what a meter cannot show.
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How to Test a Fuse on a Laptop Board with a Multimeter
How to test laptop board fuses with a multimeter: finding them, continuity and resistance checks, resettable PTC fuses, why fuses blow and safe replacement.
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How to Test a Diode with a Multimeter: Schottky, Zener, TVS and LED
How to test diodes on a laptop board with a multimeter: diode mode basics, Schottky, Zener, TVS/ESD and LED readings, in-circuit traps and typical failures.
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How to Test a Capacitor with a Multimeter
What a multimeter can and cannot tell you about laptop board capacitors: finding shorted MLCCs on a rail, capacitance mode out of circuit, polarity, and ESR limits.
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How to Measure Current with a Multimeter (and When Not To)
How to measure current with a multimeter in series, the burden voltage and fuse traps, and why a bench supply or USB-C meter is often the better tool for laptops.
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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.