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The Samsung Galaxy A40 was released in April 2019.

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Is my phone's charging system working?

Hi, so I dropped my samsung phone into the sea in winter and I left it on my drawer for months. Now I tried to fix it, took off the motherboard shields and cleaned the corrosion. After that I replaced the charging board. Now I measured the end of the main flex and it shows 5v. When I measure the battery connector it shows 2.1volts. Is this normal? Should I pay 70 dollars to replace the screen and battery or is it a waste? Please answer, it is a very important phone to me, thank you

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@theelectro54594 "When I measure the battery connector it shows 2.1volts. Is this normal?" no, it is not. The 2.1V are below the charging threshold for your battery and will not start your phone or charge the battery. You did not tell us how you cleaned the board, if there was corrosion damage and if you needed to replace any components.

You can also follow the Samsung flowchart and check the components responsible for the power circuit to the battery

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Use the Component Layout file and the search function of your PDF reader to locate the components to be checked, on the circuit board.

About the battery replacement etc, you already know the answer since "it is a very important phone to me". Go for it, replace the battery and whatever else and see what happens.

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@oldturkey03 I cleaned the mobo with a toothbrush and 95% isopropyl alcohol. Also I put my multimeter in the buzzer mode and tested the positive and negative terminals of the battery connector that shower 1 reading and no beep which I think means there's no shorts right? About the 2.1 volts if I measure 1st from the left pin and the third I get 4.4 volts which I think is normal right? If i test the 1st and last pin I get 2.1 volts. Also the golden grounds on the left side of the charging flex in the main board show 4.4 volts as well. Any idea what I'm doing wrong? Thank you

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@theelectro54594 it should be the outside pins on your battery that are the positive and negative connectors. Do you have a battery connected? Is this a new battery?

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@oldturkey03 The outside pins of the connector show 2.1 volts when charging with no battery. (my old battery is water damaged and doesnt work anymore)

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@theelectro54594 next thing to do would be to get a new battery. Once you have it installed connect an ammeter between your phone and the charger. Lets see how many amps your phone draws. Your phone should have a usb-c charging port. See if you can find an inexpensive meter that connects in line to it. Don’t Forget to check the motherboard components for corrosion damage. You mentioned seawater that makes me believe that it was saltwater which is pretty corrosive.

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@oldturkey03 you are right, it was salt water.... I believe I cleaned all corrosion but some capacitors are rusted. I checked them with a multimeter on buzzer mode and they seemed to work. Ok I will test this with an ammeter and a new battery and I will tell you

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TheElectronicsFixer さん、ありがとうございました！
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