Screen Turn off after 1 Second

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iPad mini 4 Wi-Fi

iPad Mini4 Wi-Fi版型号A1538指南。iPad Mini3的后继版本iPad Mini4 发布于2015年9月9日。

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Edmond Teo @edmondt

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发帖于: 2019年3月26日

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Screen Turn off after 1 Second

Hi All,

I've just replaced my iPad Mini 4 Battery and also LCD Panel (wake flex cable has been soldered). When I tried to turn on the iPad the Apple Logo came up for 1 Second and the screen goes black. Tried to press and hold the power button again after awhile, I could see the screen showing Hello (iPad Setup Page) and same thing happened it goes off after 1 Second.

I'm sure the iPad is powered up and I can hear the charging sound when I plug the charging cable.

Please help me! I'm not sure what I did wrong :(

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Replayed the video several times and I noticed there's a dark patch on top left corner during that 1 second of screen time, this is indicative of a defective LCD screen. In any case, follow @refectio guide to troubleshoot.

由 Gorilla 完成的 2019年3月26日

@sammyz good catch!

由 Minho 完成的 2019年3月26日

Thanks @sammy !

由 Edmond Teo 完成的 2019年3月28日

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Minho @refectio

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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.

You can connect the original, cracked screen to confirm this. If the original screen has the backlight on, then the replacement screen has an issue. If the original screen also doesn't show the backlight, then the backlight circuit is blown.

If iTunes doesn’t recognized the device than the problem is more than just a screen or backlight issue.

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Hi Minho,

Appreciate the detailed explanation on the possible situation.

The LCD Panel you see on the video is actually the Original Panel which was damaged at the right side corner so I ordered a New Panel for replacement. When I replaced the New Panel there isn't any activity when I turned it on so I thought it might be a Dodgy Panel which is way I switch it back to the Original one before taking the video.

Let me try out the mentioned troubleshooting guide you've provided and see if it's a replacement screen issue.

Just wanna confirm that the worst case would be the faulty LCD Panel right? Will there be a possibility that the logic board is faulty too?

Regards,

Edmond

由 Edmond Teo 完成的 2019年3月28日

Both options are possible. Damaged backlight circuits during repairs is a common occurence so don't rule it out.

由 Minho 完成的 2019年3月29日

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Replayed the video several times and I noticed there's a dark patch on top left corner during that 1 second of screen time, this is indicative of a defective LCD screen. In any case, follow @refectio guide to troubleshoot. — Gorilla
Hi Minho,

Appreciate the detailed explanation on the possible situation.

The LCD Panel you see on the video is actually the Original Panel which was damaged at the right side corner so I ordered a New Panel for replacement. When I replaced the New Panel there isn't any activity when I turned it on so I thought it might be a Dodgy Panel which is way I switch it back to the Original one before taking the video.

Let me try out the mentioned troubleshooting guide you've provided and see if it's a replacement screen issue.

Just wanna confirm that the worst case would be the faulty LCD Panel right? Will there be a possibility that the logic board is faulty too?

Regards,

Edmond — Edmond Teo
Both options are possible. Damaged backlight circuits during repairs is a common occurence so don't rule it out. — Minho

iPad mini 4 Wi-Fi

Screen Turn off after 1 Second

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