Today I want to walk you through the intricate and rewarding process of repairing a water-damaged Samsung S9.

When a soaked device ends up in your hands, the first rule of thumb is to disconnect the battery connector right away. It's a simple yet crucial step that prevents further damage to the motherboard and helps to avoid short circuits. I started this repair by carefully removing the back cover to get access to the internals of the phone. I then removed all the screws from the intermediate housing and the NFC antenna, along with the device's two coaxial cables and the SIM tray. With all these components out of the way, I was able to lift the motherboard.

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I then performed a meticulous visual inspection under the microscope, looking for any signs of moisture and corrosion. I discovered a few areas that had been compromised by the water, including a sulfated area in the battery connector and an oxidized shield. A capacitor had even detached from the motherboard due to corrosion. Luckily, with a high-quality microscope, I was able to spot and address these issues promptly.

I proceeded to solder the detached capacitor back into place. I applied a bit of flux and used a hot air station set at 380ºC with a low 10% air flow, which helped me to achieve a strong and shiny solder without moving the capacitor.

Once the capacitor was reattached, I moved on to the cleaning phase. I used cotton and a contact cleaner to meticulously clean the sulfate from the motherboard. I prefer this method over an ultrasonic cleaner for less severe cases, but for a motherboard that's heavily damaged, the ultrasonic cleaner would be my go-to.

Once everything was cleaned up, I powered up the device using a recycled battery connector. However, I noticed that the device was not charging the battery. I suspected corrosion under the shields and proceeded to remove them. I leveraged a surgical scalpel and a precision cutting plier to do this job while keeping the CPU safe from excessive heat.

Upon removing the shields, I found a good bit of corrosion which I then cleaned meticulously. I also applied a bit of flux and solder paste to reactivate the old tin and improve the affected area.

Finally, with the device cleaned and all the corrosion dealt with, the device began charging correctly. It's always a pleasure to see a device come back to life after such a process. I charged around 70 euros for this type of repair – a fair price for a breakdown of this nature.

Remember, a good technician can make a solid living by providing this type of service. So, if you're in the market for a new skill, invest in your training and consider phone repairs. I'm Leonardo, and I look forward to sharing more repairs with you in the future. Until next time, cheers!

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