MacBook liquid damage: what shops should do first

A wet MacBook is not automatically a dead one. What it becomes is decided by the first few hours. Power it off, keep it off, and do not charge it: on a machine this densely packed, live current is what turns a spill into a dead board. This is the same first-hour advice we give before a liquid job comes to the bench, written for shops rather than customers.

The first hour, for a MacBook

1. Power it off if it is on, and resist the urge to check "if it still works". That test is what pushes liquid into places it had not reached.
2. Do not charge it. A charging port is a power feed to a wet board. The fastest way to short a rail.
3. Keep it upright, screen open, to let liquid drain away from the board rather than pool against it.
4. Note the history: what spilled, when, and whether the machine was on at the time. It changes the bench's starting point.
5. Get it to a board bench quickly. Corrosion is not a passive process. It eats traces and pads for as long as the residue sits there.

Why MacBooks are unforgiving

Three reasons a MacBook spill ages worse than a plastic Windows laptop's:

• Density. Multilayer boards with components packed under chips mean liquid wicks into places no cleaning towel will ever see.
• The port electronics. USB-C power controllers sit right behind the ports. The first thing liquid in the port meets, and a common reason dead MacBooks arrive with 5 V but no negotiation.
• Soldered, encrypted storage. If the board does not survive, the data is not a matter of pulling a drive. It comes back by repairing the board so the machine boots, or not at all. That is the whole reason the repair matters more on a Mac.

The "it works again" trap

Machines that dry out and boot are the most expensive kind, because everyone relaxes. The residue that dry-out leaves is still conductive and still corrosive. Boards fail weeks or months later, usually with more corrosion and a bigger bill. Cleaning now is the cheap version of this job; rescuing a machine in a month is the expensive one.

What we do at the bench

We strip the machine, clean corrosion off the board properly, replace components that shorted or died, and bench-test the rails and the machine itself before it goes back. Reports with photos straight onto your ticket. It lands in the fixed £120 + VAT laptop logic board repair, post both ways included, or £180 + VAT in the priority slot; diagnosis at £35 + VAT is waived when the repair goes ahead. If the corrosion reached somewhere it cannot be saved, the diagnosis says so (with the evidence) before any paid work.