shamino

Water damage can cause all kinds of problems, some of which may not be fixable without a board replacement. Assuming your device doesn’t have permanent damage, the important thing is to try and get all the water out of the phone. If you haven’t already done so, turn the phone off and put it in a bag of rice (or silica gel packets, if you have them) for a day or two. This should help to draw any moisture out of the phone. Simply leaving it out in the air or trying to shake out the water will not generally work to remove all of the moisture, and it doesn’t take very much to short out a circuit trace. This may not be enough to get everything working, but it should definitely be one of the first things you try whenever you have a water-damaged electronic device.

90’s silicon may not run as hot as today’s silicon, but many PlayStation units had problems with overheating. A heat sink and a fan would’ve been a good idea.

Three AA batteries produce 4.5v. Depending on the components used, a 6v power source might cause damage.

Yes you can, but it’s not a good idea. If you hold the soldering iron on the chip for too long, you might overheat it to the point of causing damage. This isn’t a problem for someone experienced with soldering, but it could be a problem for a beginner. Using a socket avoids the problem.

If you hold the leads with your fingers, you will get burned. Hold them with small pliers or large tweezers.

A low-wattage iron or a tip that is too narrow will make this difficult. A large trace of copper requires a certain amount of thermal mass to heat it properly. A large wedge-shaped tip will help here if you have one.

The lead-length is not necessarily the best way to identify the cathode, since leads might be cut. A more reliable way is to look at the plastic housing. For a round LED, like these, you will notice that the rim at the base is flat on one side. That side should be adjacent to the cathode.

LEDs that come in other shapes may have other markings, but there will almost always be some irregularity in the plastic housing or a mark printed to indicate where the cathode is.

You might want to explain how to read the markings on a capacitor. One reference for this is https://www.engineering.com/ElectronicsD...

For capacitors with three digits, the first two are digits and the third is a power-of-10 multiplier. The units are pico-farads (pf). In this case, “105” indicates a “10” followed by 5 zeros or 1,000,000 pf, which is 1 µf

The next step is describing yellow-violet-brown resistors, which are 470. Step 11 is using the yellow-violet-red resistors, which are 4700.

Looks like one to me. I’ve been playing around with enough IoT development kits recently to recognize a little metal box with a hole in the lid as some kind of environmental sensor. Why it would be needed in a glorified battery charger is a more interesting question.

There is a standard “spark plug socket” that comes with most socket wrench sets. As far as I know, they are all the same size.

Note that you should not use an ordinary socket of that size - a spark plug socket has a rubber grommet in it to hold the plug and prevent damage.