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iPad Air 第2世代のセルラーモデル用修理ガイドです。

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How do you check which component is broken?

Hi,

I tried to replace my ipad broken screen. Initially when I first switched the broken screen out, the new screen worked, but I didn’t actually sealed it yet cause I wanted to know if it works properly before I finally seal it off. After trying to change the home button too, I plugged in the charging port without the display LCD plugged into the board. And after that I can’t turn it on anymore.

My guess is that some fuse in the tablet is burn or maybe the whole motherboard is burn. Is there any way to check which part of it is burnt?

P.S. There’s no plugin sound when I plug in the lighting cable to my computer.

Thanks for the advices in advance.

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It’s very important to always disconnect the battery before disconnecting/reconnecting the screen assembly. The issue is that the LCD connector has pins that have high voltages (i.e. the backlight is ~20V) and ground in very close proximity. When you fumble around trying to line up the connector plug to the receptacle, you can short out the voltage rail and cause damage to the components in the backlight circuit. If you’re lucky, then only a backlight filter is damaged but other times, the entire circuit could be affected. Either way, this type of repair requires micro-soldering and isn’t really a DIY repair.

To test for this, plug your device into a charger or an iTunes enabled computer. Then shine a bright flashlight on the screen. If you can see a dim image, then the backlight circuit has been damaged. If you can’t see an image at all, then it may be the LCD circuit that is damaged.

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Hi,

Thanks for the response. I understand that that's my fault for not disconnecting the battery when working on the tablet. I'm like newbie in this kind of stuff. I've tried to plugin the whole screen panel to another backup iPad and it works well there so I'm pretty sure it's not the screen side problem. So I'm guessing something in the Mobo is fried then. Guess I'll start looking for new tablet. Cause fixing the tablet by soltering it is too much for a newbie like me. Thanks anyway for trying to help out.

さんによる

It wouldn't be an expensive repair. Look for a local micro-solderer. You could then sell the tablet and recoup the repair cost and have some extra to help pay the new one. No need to load up the landfill with more techno-garbage that could find a second lease on life.

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:( I guess I don't have much options. Thanks again for trying to help me out.

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Have you tried doing a force restart? Should be 10 seconds of either holding Home button + Power, or Power + Volume buttons.

You may also want to try a replacement screen. If you have a device repair place in your area that has them in stock, they can probably test it out on your device. But in appreciation you may end up buying the replacement part if that is the solution.

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Hi, thanks for the response.

I have tried the power button + home button technique and that doesn't work.

I tried to use my "new" replacement screen on the iPad which I salved from and it works on that iPad. I am pretty sure it has something to do with the motherboard side and not the screen component.

さんによる

Does the device at least vibrate when you turn it on? I had an issue with a faulty replacement screen, but knew that the phone was turning on because it vibrated on start up.

Did you say that you used the old broken screen and it still worked? Or that you are borrowing another screen from another iPad?

さんによる

I've two iPad. One iPad which the screen is broken and i bought another activation locked iPad and salvaged the screen panel from it. When the issue came up, I though something on the screen was broken so I plugged it back to the activation locked iPad and that screen still works fine. So I'm guessing it's my own iPad mother board that's broken.

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Vincent Yu さん、ありがとうございました！
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