Here are some answers to some of the questions that have been raised here. I have been in the Apple Computer repair business for more than 20 years. I founded and ran a company called Pre-Owned Electronics and now I have started another company called MicroReplay. Our company specializes in repairing Apple logic boards.
When you spill liquid on a computer and it gets on the logic board, the minerals and salts in the liquid immediately begin to eat away at the metal and fiberglass that the board is made of. If there is a power source available, such as a battery, which is supplying power to the board (even when the computer is turned off), the electric current will interact with the liquid and accelerate the corrosion process. This will cause the copper and other metals to migrate all over the board.
If you spill liquid on a computer, unplug immediately and remove the battery. This will help slow the process. Even still, there is usually a BIOS or PRAM battery on the board which supplies power to the board to keep the clock and other settings while it is off. This battery will also drive corrosion. I don't want to make this sound like an ad, but the sooner you get the unit to a properly equipped repair facility, the better.
The first thing we do with a liquid spill logic board is clean off whatever the liquid is. This is done correctly by cleaning the board in an immersion bath with industry-standard chemical solutions and using high-powered ultrasound to remove all the contaminates. This step is essential because unless you get all the liquid off, even from under the chips and other devices, the corrosion will continue and the board will -- guaranteed -- fail again. Without the ultrasound, there is no way to properly clean a board.
The next step is to repair any damage to the circuit board itself. This includes damaged masking, substrate damage, corroded etches and missing or damaged pads. Then we look for missing or damaged devices which must be repaired or replaced. These devices are truly tiny -- some smaller than gnats. These steps are performed using a high-powered microscope and specialized soldering equipment. We also use specialized chemical compounds to repair the board itself.
Finally we might need to replace some of the Ball Grid Array (BGA) or QFN devices like the video processor, memory controller or some of the various power regulators or other chips. This step is done using specialized equipment which allows us to remove, align and replace these devices. The equipment allows us to subject the devices to an exact time/temperature profile which we develop during the R&D process for each board. These are very expensive stations, usually costing $25K or more each.
Once we get a board to post, we run it though a burn-in process to make sure it works. We then put a six month warranty on it and ship it out!
MicroReplay 31 Dunham Road #1 Billerica, MA 01821
Voice: 978-262-1340 Web: www.microreplay.com
I may receive some form of compensation, financial or otherwise, from my recommendation or link. <Edited by Host>