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Apple logic board has a lot of SMT components near the sockets that a heat gun will disturb. Focus on cleaning the soda spillage and then see where things are. One thing I did forget to ask is your USB device/s powered or unpowered? Your USB I/O could be OK, but, the power side of the port could be damaged. Try a powered device or hub to see if thats your problem.
LAPTOP/MONITOR SCREEN VERY DIM OR DOES NOT ILLUMINATE
A question I am often asked is "How can I tell if the backlight or inverter has failed on my laptop/monitor as I can only just make out an image?"
The answer is that there are several causes of a dim display or the failure of a backlight to illuminate the screen. As most people are aware, inverter and backlight failure are the most common. Other causes are:- a faulty or damaged LCD/Inverter cable, Faulty motherboard and a faulty screen.
Firstly try the obvious!
There is a little switch usually located near the hinge which switches the display off when the lid is closed. This can sometimes get jammed and is easily overlooked. It might simply be a question of unjammimg it or making some sort of repair to it.
Most laptops are able to toggle between an external display and the built in screen. Sometimes the laptop can get confused so it is worth toggling between external and built in screen. As most have several different settings it is worth doing this several times. If the laptop screen flashes when you do this it would indicate that the inverter is trying to start the backlight. This means that there is a good chance that either the backlight or inverter has failed but does not totally rule out the other components.
It may also be worth resetting the bios as these settings can sometimes be lost especially if the cmos battery is on its way out or has been disturbed. Unfortunately, unless you are a qualified electronics engineer it is very difficult to test the individual boards and components and fault location is basically a case of substitution until the problem is cured or you decide not to spend anymore money on it!
Laptops usually only have 1 backlight so obviously if the backlight fails there is no illumination of the screen but the same result happens if the inverter or one of the other components mentioned above fails! In the case of monitors, most monitors have 2 or more backlights and it would be unusual for all the backlights to fail at the same time so if you have no illumination of a monitor screen but the power light is green then chances are the inverter has failed. A failed backlight on a monitor will result in one half of the screen appearing brighter than the other half.
Backlights can be tested by connecting them to a known good inverter. You can use one of the inverters they sell for case moding. Just provide a 12V input for it and connect your backlight to one of the output sockets. If your backlight illuminates then it is OK and the fault lies elsewhere. A pink or red hue to the screen is nearly always a sign of a failing backlight and if this happens it is well worth replacing the backlight as the only other thing that can cause this is a faulty screen. Remember backlights work on an AC Voltage of around 1000v and although the wattage is very small can give you a nasty shock and could prove fatal if you have a pacemaker or similar.
We now come to an item that can only be tested by a qualified electronics engineer or simply substituted. There is usually a small fuse located near the input connector. Check this for continuity. Depending on the inverter there can be several inputs but it is worth checking the input voltages. Basically you will have a positive and negative feed plus a switching voltage and a brightness connection. The basic voltage for powering the inverter is usually the same as you laptop input voltage but the switching voltage may be as low as 5 volts DC. The brightness voltage can be anything from 0 to 5 volts but