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2016年3月に発売されたSamsungの機種です。モデル番号はSM-G930Vです。

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Can I fix the mainboard?

I was trying to remove the battery of the phone to get to the display and accidentally popped off a surface mount component with the spudger. I think it might be a diode and it doesn't look broken, I believe a dot of welding would fix it. It was fixed right below the back camera, on the left side. There are two of them side by side, easy to see.

Is is possible? How would you do it?

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Nicolas Caycedo there are a few component and your description of the location is not enough to identify your component. Use this guide iFixitでの質問に画像を追加する方法 to post images with your question. that way we can see what you see.

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Thanks for the guide! It's not easy showing such small components in detail, I hope they are clear enough :)

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You would need to have Surface mount soldering tools. Or depending on how large it is, you could use a soldering iron with a really fine tip and a pair of tweezers to try to resolder it back on. This is a very tedious process but if its already broke you cant break it more

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I'll try soldering it back on, ordered some soldering paste and use my heat gun. Is there any way to check if I managed to do it correctly or if it's broken? I don't know exactly what that component does.

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The way to check is to just test it. Be careful with the heat gun if you dont have a narrow tip. you might damage other things as well

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Nicolas Caycedo さん、ありがとうございました!
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