Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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What is wrong with my iPhone 3GS?

Hi, I recently bought a broken iPhone 3Gs which doesn't turn on. Thinking the dock connector was broken, I replaced it, and of course, it still doesn't work. I've plugged it in overnight, and it doesn't even feel warm. It isn't water damaged, and I've tried to reset it while plugged in to the computer, and A/C. I can't get it into DFU mode, as it isn't even detect by the computer in the first place. Is the dock connector, battery, or mainboard dead? Also, the screen and LCD are both cracked, if that matters.

Thanks!

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Bro, since you already replaced the dock connector, it is the least likely item on your list, but of course there is always a possibility. The very first thing I would replace is the battery. My approach to figure it out would be the battery first, then the dock connector. Check the fuses on the board, visually inspect the board for any damage or missing components. Due to the size of the components you will have to have a magnifier source for a good inspection. After that, check the board and the dock connector for power with a multimeter. Always do one thing at a time so that you do not get to far ahead of yourself. Hope this helps, good luck.

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Hi, thanks for replying so quickly. Wouldn't iphone still turn on if the battery is broken? Which parts of the board should I check?

Thanks a lot!

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idevice are really finicky when it comes to the battery. Like I said, that is where I would start. Check the fuses and if you have a multimeter, check if you have any power to the board. I attached 2 images to the original question that might come in handy.

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Bro will be eternally grateful.
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