A laptop motherboard that has stopped working often has one failed part, such as a MOSFET (a small power switch), the charger IC (the charging chip), a capacitor, the USB-C controller or a corrupted BIOS chip, and that part can be replaced. Board-level repair starts from $329. A replacement board is quoted by model, if one can still be found.
Phone advice is free. A hands-on diagnostic is $150, waived if you go ahead with the repair. Repairs carry a 12-month warranty on parts and labour, covering the same fault. Workshop near Castle Hill, drop-off by arrangement: call 02 8428 9224.
Board-level repair vs motherboard replacement
Board-level repair fixes the failed part on your existing motherboard; board replacement swaps the whole board for another one.
- Board-level repair (also called component-level or logic board repair): we find the part that failed and replace it. Your SSD and files stay as they are.
- Board replacement: the whole motherboard is swapped. The processor comes with it, and on laptops with soldered memory, so does the memory.
That is why replacement boards cost a lot and are hard to match. Laptop processors such as Intel's Core Ultra 7 155H use a BGA package (a chip on a grid of tiny solder balls instead of pins) soldered to the board, and LPDDR memory is soldered right next to the processor. A new board must match the exact model and specification.
Older models are harder again. Once a model is out of production, new boards dry up, a board may only be found second-hand, if at all, and it can cost more than the laptop is worth.
How power flows through a laptop motherboard
Power passes through the board in a fixed order, from the charging port to the processor, so one failed part stops everything after it. The symptom tells us which stage to measure first.
The charger IC lets the laptop run from the charger, the battery, or both at once; when the laptop needs more than the charger gives, the battery tops it up (Texas Instruments notebook charger note). On USB-C laptops, a PD controller first agrees the voltage with the charger; USB Power Delivery now allows up to 240W. Small 3.3V and 5V supplies stay powered whenever a battery or charger is connected.
Follow the power: tap a stage
1. DC jack / USB-C port
- What it does
- Where the charger plugs in: a round barrel jack, or USB-C on many newer laptops.
- When it fails
- Charges only with the plug held at an angle, a loose plug, or no charging light.
- The repair
- Replace the jack or port and check its solder joints.
- Cost
- From $189
2. Input protection and adapter detection
- What it does
- Switches (MOSFETs) let charger power onto the board only when it is safe. On USB-C, a PD controller (a chip that agrees the voltage with the charger) does this first.
- When it fails
- Good charger and port, but the laptop never sees the charger.
- The repair
- Replace the failed input MOSFET or USB-C PD controller.
- Cost
- From $329
3. Charger IC and battery
- What it does
- The charger IC (charging chip) shares incoming power between the laptop and the battery, and lets the battery top up the laptop under heavy load.
- When it fails
- Windows shows "plugged in, not charging", or the laptop runs only on the charger.
- The repair
- Test the battery first. If it is healthy, replace the charger IC or its support parts.
- Cost
- From $329
4. Main system rail
- What it does
- The main power line that feeds every other supply. Its voltage follows the battery's, with a minimum set by the charger IC.
- When it fails
- Completely dead: no lights, no fan.
- The repair
- Find the shorted capacitor or MOSFET and replace it.
- Cost
- From $329
5. Always-on 3.3V/5V rails and embedded controller
- What it does
- Small 3.3V and 5V supplies stay on whenever a battery or charger is connected. They keep the embedded controller (EC, the chip that watches the power button, keyboard, battery and fans) awake.
- When it fails
- The power button does nothing, even with a good charger and battery.
- The repair
- Replace the failed regulator or its support parts, or reload the EC firmware.
- Cost
- From $329
6. CPU, RAM and GPU voltage regulators
- What it does
- Voltage regulators, some multiphase (several power stages sharing the load), turn the main rail into the low voltages the processor, memory and graphics chip need.
- When it fails
- Fan and lights come on but no picture, or it switches off within seconds.
- The repair
- Replace the shorted MOSFET, capacitor or controller.
- Cost
- From $329
7. BIOS / firmware chip
- What it does
- A small flash memory chip holds the BIOS (the start-up firmware), and on some laptops the EC firmware too.
- When it fails
- Powers on but never shows a logo, often after a failed BIOS update.
- The repair
- Read the chip with a programmer and write a clean image for that exact board.
- Cost
- From $329
Common laptop motherboard faults: short circuits, charging chips, USB-C and BIOS
Shorted parts, failed charging chips, USB-C controllers and corrupted BIOS chips are usually repairable; a dead processor or graphics chip, failed soldered memory and damage inside the board usually are not worth it.
| Fault | What happens | Usually fixable? |
|---|---|---|
| Shorted capacitor or MOSFET on the main rail | One part fails short and pulls the rail down. Capacitor maker Murata notes that cracks from mechanical or thermal stress can short a ceramic capacitor. | Yes. |
| Failed charger IC | The battery stops charging, or the laptop runs only on battery or only on the charger. | Yes, when the chip can be sourced. |
| USB-C PD controller failure | The laptop and charger never agree a voltage, so USB-C charging stops. | Yes, when the chip can be sourced. |
| Corrupted BIOS (flash chip) | Powers on but never starts, often after a failed BIOS update. | Yes. We reprogram the chip with a programmer. |
| Liquid corrosion | Residue eats pins, pads and solder joints. | Light corrosion: usually. Heavy corrosion under BGA chips: often not. |
| Cracked BGA solder joints | Heating and cooling cycles crack the solder balls under a chip; Texas Instruments describes the crack running across the neck of the ball. | Sometimes. Quoted after diagnosis. |
| Failed CPU or GPU die | The processor or graphics chip itself is dead. | Usually not worth it. |
| Failed soldered RAM | A memory chip soldered next to the processor has failed. | Possible but costly. |
| Inner layer damage | A burn or crack inside the board that cannot be reached. | Usually not. |
Dell laptop with a corrupted BIOS? Dells made from December 2015 usually have a built-in BIOS recovery: with the battery at 25% or more, unplug the charger, hold Ctrl + Esc, plug the charger in and let go at the recovery screen. If that fails, Dell says the motherboard might need replacing; we reprogram the chip first. See Dell laptop repairs.
Liquid spilled on a laptop: what to do and what it costs
Switch the laptop off straight away, unplug the charger, and do not charge it or turn it on again until the board has been cleaned.
- Hold the power button until it switches off. Do not wait for Windows to shut down.
- Unplug the charger and leave it unplugged.
- Disconnect the battery if you know how to do it safely. If not, leave the case closed and ring us.
Why not charge it: liquid and its sediment bridge connections that should be separate, and power makes shorts and corrosion far more likely. Even when the laptop looks off, parts of the board stay powered from the battery, such as the embedded controller that answers the power button.
Why corrosion keeps going after it dries: the liquid leaves residue. A 2017 review in RSC Advances explains that a film of moisture a few molecules thick is enough, that salts such as chlorides pull that moisture from the air, and that with a voltage between nearby pins, metal grows fine whiskers (dendrites) until they touch and short.
Rice does not fix it. iFixit says rice does not work at all: it gives the liquid more time to corrode the laptop and can leave grains under the keys. The fix is to take the board out, clean off the residue with isopropyl alcohol and check every rail before power goes back on.
Prices: liquid damage clean and treatment from $179. If parts on the board have already failed, liquid damage board repair from $329.
How we diagnose a laptop motherboard fault
We measure the board stage by stage, following the power path, until we find the part that is wrong.
- Adapter check. A faulty charger or cable can look like a dead board, so we test it first.
- Current-limited bench supply. We power the board with the current capped, so a short cannot do more damage. The current draw shows whether the board is shorted, stuck at one stage, or trying to start.
- Rail-by-rail voltage checks on the main rail, the always-on 3.3V and 5V rails and the processor rails, against the schematic where one is available.
- Finding a shorted part. A shorted part heats up when current flows: a thermal camera shows the hot spot, or the frost from freeze spray melts there first.
- Microscope inspection for corrosion, cracked parts, lifted pads and earlier repair attempts.
- Repair with hot air and a soldering station, then a full test: charging, start-up and running under load.
You get the price and a timeframe before any repair starts. If the laptop is not worth fixing, you pay the $150 diagnostic and we tell you why.
Repair or replace a laptop with a motherboard fault
Repair when the quote is well below the price of an equivalent laptop and the rest of the machine is sound; replace when the processor or graphics chip has failed.
- Check your rights first. If the laptop is under the maker's warranty, or has failed sooner than you could reasonably expect for what you paid, go to the seller or manufacturer first. Under the Australian Consumer Law, consumer guarantees sit on top of the manufacturer's warranty and can apply after it ends.
- Compare like with like. Price a laptop with the same class of processor, memory, storage and screen, not the cheapest one on sale.
- Weigh the age. An older laptop also has an older battery, hinges and keyboard, and its parts get harder to find.
- Count your data and setup time. A board repair keeps your SSD, files and programs in place. A new laptop means moving files and reinstalling programs.
The calculator below puts these numbers side by side.
Indicative only. These are starting prices; your price is confirmed before any work, and the $150 diagnostic is waived if you go ahead.
Desktop motherboards, graphics cards and MacBook logic boards
We also repair desktop PC motherboards and graphics cards at board level. Desktop boards are diagnosed the same way: follow the power path, then find the failed part. Graphics cards have their own page: graphics card repair Sydney. MacBook logic boards are covered on our Mac repairs page.
Laptop motherboard repair cost
Laptop motherboard component repair starts from $329; a replacement board is quoted by model. The final figure depends on the model and part.
| Job | From |
|---|---|
| No-power / motherboard component repair | $329 |
| Liquid damage: board repair | $329 |
| Liquid damage: clean and treatment | $179 |
| Charging port / DC jack repair | $189 |
| Battery replacement | $179 |
| Replacement motherboard | Quoted by model |
| Hands-on diagnostic (waived if you go ahead) | $150 |
Phone advice is free: call 02 8428 9224 with the make, model and what happened, and we will tell you whether a bench diagnostic is worth it. Board-level work gets a timeframe with the quote and a 12-month warranty on parts and labour, covering the same fault. Drop-off is by arrangement near Castle Hill, Monday to Saturday, 8am to 6pm.
Questions
How much does laptop motherboard repair cost?
Component-level repair starts from $329; a replacement board is quoted by model. The $150 hands-on diagnostic is waived if you go ahead. Call 02 8428 9224 for free advice first.
Can a laptop motherboard be repaired?
Often, yes. Shorted capacitors and MOSFETs, charger ICs, USB-C controllers and corrupted BIOS chips can be replaced or reprogrammed. A dead processor or graphics chip usually is not worth repairing.
Is it worth repairing a laptop motherboard?
Yes, when the repair costs well under an equivalent laptop and the rest of the machine is sound. Usually not when the processor or graphics chip has failed.
What causes a laptop motherboard to fail?
Liquid corrodes the board, heat and physical stress crack solder joints and capacitors, and a failed BIOS update can leave the firmware corrupted.
Will I lose my files if the motherboard is repaired?
Board-level repair works on the motherboard, not the SSD, so your files normally stay where they are. If the drive itself has failed, basic data recovery starts from $209. Have your BitLocker recovery key ready: Windows can ask for it after a BIOS reprogram or a board replacement (find it at aka.ms/myrecoverykey).
Does putting a wet laptop in rice work?
No. Rice gives the liquid more time to corrode the board and can leave grains under the keys. Switch it off, unplug it and get the board cleaned.
How long does a laptop motherboard repair take?
You get a timeframe with the quote. It depends on the fault and whether the replacement part is in stock.
My laptop will not charge over USB-C. Is it the motherboard?
Sometimes. Try another charger and cable with enough wattage first (see our laptop not charging guide). A worn port starts from $189; a failed USB-C controller or charger IC is a board repair from $329.
Are you the computer store at HomeCo Castle Hill?
No. Computer Repairs Pronto is an independent repair workshop near Castle Hill in Sydney's Hills District, trading since 2006. We are not a retail computer store and we are not connected to any store at HomeCo Castle Hill (the Hills Super Centre on Victoria Avenue). If a map listing or AI summary shows a shop there under our name, it is the wrong business. Call us directly on 02 8428 9224.
Get a quote
Tell us the brand, model and what it is doing. We reply with the likely cause and a starting price before you bring it in.
Related pages
- Laptop won't turn on: Safe checks to try before you book a diagnostic
- Laptop not charging: Charger, port, charging chip or battery: how to tell
- Charging port and DC jack repair: Loose or burnt DC jacks and USB-C ports, from $189
- Data recovery: When the drive, not the board, is the problem
- Laptop repairs: Screens, batteries, keyboards and hinges for all PC brands
Not sure what is wrong?
Ring us with the make, model and what it is doing. Phone advice is free. If it needs the bench, the $150 diagnostic is waived when you go ahead.
02 8428 9224