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Samsung A40 Sea Salt Water Damaged. -Photos and Video Included!-

Hello, I have a samsung a40 that fell in salt water at like December of 2023. I tried to fix it in mid 2024 but I got no signs of life. Today, which I have more tools than then, I tried to fix it again. I took off the shields off the chips and cleaned everything with 99 percent alcohol and an ultrasonic cleaner with distilled water. After replacing battery and charge port and sub-main cable, the phone draws 0.00 amps and a high pitched noise comes off the mainboard. No vibrating and no speaker, and no screen sign.I have a lot of important photos on there that I would like to save. Does anyone know if this phone is saveable?? And if it is, how should I proceed??Please answer it is very important!! Thank you.Here are some photos of the main board and a video of the high pitched sound when charging:

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which country are you in

daniel 의 2025년 8월 13일

@tech_ni Why does that matter?

giant474 의 2025년 8월 13일

@tech_ni I'm EU though, southern east

giant474 의 2025년 8월 13일

@giant474 because if you wanted someone to look at it for you and you were in the uk i could of looked at it for you

daniel 의 2025년 8월 15일

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게시됨: 2025년 8월 14일

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Hi @giant474

Here's the troubleshooting guide that may help.

Go to p.11 (of 54) and follow the Power on flowchart and see how far you get through it.

Use the search function in your browser to find the location of the components shown in the flowchart in the board layout diagrams in the guide - see p.9. You will have to zoom in a lot to see them.

Hopefully a start.

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@jayeff Thanks a lot for this but just today I desoldered the pmic and it had a lot of corrosion under it so it's probably that most ics are corroded underneath unfortunately. I might have to buy a functional main board and just transfer the 2 main chips over (cpu and the storage one). Again thanks a LOT for the help.

giant474 의 2025년 8월 14일

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Samsung Galaxy A40

Samsung A40 Sea Salt Water Damaged. -Photos and Video Included!-

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