Accidentally replaced LCD digitizer without removing battery first

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iPad Mini 2 Wi-Fi

Wi-Fi版的iPad Mini 2指南。2013年10月22号发布同年11月12号上市。iPad Mini 2就是配备了Retina显示屏的iPad Mini，在更小尺寸的的7.9寸屏幕上拥有和iPad Air相同的像素。

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chaubly @chaubly

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发帖于: 2017年1月28日

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Accidentally replaced LCD digitizer without removing battery first

Hello,

I was wondering what I can do to power on my ipad mini 2 after I have replaced the LCD digitizer without removing the battery flex cable first? I read on the forum that you are supposed to put the battery cable on last after placing the LCD digitizer cable.

Also read that I may have to replace the fuse, which I'm not quite sure where it is located.

As of right now, the ipad is recognized on my laptop but, it doesn't power on.

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If it is the backlight circuit needing troubleshooting the iPad should still display something but very dim.

Usually backlight filters / fuse / chokes (I think they are called) need to be checked for continuity via a digital multimeter.

由 Ben 完成的 2017年1月28日

Also you can hold a flashlight over the display, and see if you can still see the display

由 iMedic 完成的 2017年1月28日

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Minho @refectio

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The backlight fuse is not a fuse but a ferrite bead. The purpose of the ferrite bead is to filter out high frequency noise on the line. When there is high frequency noise, the ferrite bead acts like a resistor and throttles the noise.

When a DC signal is applied, the bead behaves as a near short (usually only in the milliOhm range, depending on the bead).

This component typically fails when you forget to disconnect the battery before removing or replacing the LCD connector. To properly test it, you need to check it's resistance with a meter. For all intents and purposes, it should read as a dead short (~0 Ohms).

On the mini 2, it is L2200 and it is under the shield. If you have the right tools and experience, it is not a difficult repair. Otherwise, I suggest you find a micro-soldering repair shop to have it done professionally.

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If it is the backlight circuit needing troubleshooting the iPad should still display something but very dim.

Usually backlight filters / fuse / chokes (I think they are called) need to be checked for continuity via a digital multimeter. — Ben
Also you can hold a flashlight over the display, and see if you can still see the display — iMedic

iPad Mini 2 Wi-Fi

Accidentally replaced LCD digitizer without removing battery first

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