Replaced cracked screen. Ipad now doesn't turn on.

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iPad Air Wi-Fi

首先你得要准备一部iPad Air（1rd Gen）只支持Wi-Fi的机型这里我们指的是A1474机型它拥有64位的A7双核处理器并拥有16,32,64GB甚至是128GB的内存选择

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Steve Song @stevesong

声誉积分: 59

Digital Understorey Ltd

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发帖于: 2015年5月29日

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Replaced cracked screen. Ipad now doesn't turn on.

I have attempted a repair on an iPad Air with a cracked screen. Prior to starting the repair, the iPad worked with the cracked screen. After the repair, which went flawlessly, the iPad would not turn on. If I connect the iPad to iTunes, iTunes recognises the iPad but says that the iPad is locked and must be unlocked before doing anything else.

At this point, I assumed I had purchased a dud digitizer on eBay and ordered a new one from ifixit. That arrived this morning and I repeated the repair procedure... with the same result.

At this point, I am assuming that I must have somehow damaged the LCD screen during the repair. Before I go ahead an order an LCD screen though, I would like to know:

is that a reasonable assumption?
are there any tests I could perform to confirm this diagnosis?

Thanks.... Steve

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Steve Song @stevesong

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发帖于: 2015年5月30日

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At the suggestion of Mike from iFixit, I disconnected the battery from the logic board and then reconnected it. After connecting the power cable, the iPad Air booted up, screen working fine. Hurray!

Unfortunately I failed to check everything before sealing the digitizer back on and failed to notice that the power button and magnetic shut-off is not working. Back to the drawing board.

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Buddhika Mahesh @buddhikamahesh 声誉积分: 15.1千 13 39 16 · Answer 1 · 2015-05-29T06:57:26-07:00

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Buddhika Mahesh @buddhikamahesh

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Hello Steve Song,

it seems to be you are in trouble now,

Step 1

Replace old damaged screen and check whether functionality of device. if it works fine no need to touch logic board.

Step 2

logic board detecting by the iTunes means power and processing functionalities works fine and you need to focus on visual output, check any sign of damages in Display connector, any burn marks or can you observe any component missing on logic board?

Step 3

if you plug bad quality LCD such as back light short circuit LCD, back light driver getting damaged. i guess what you experiencing new, so you need to troubleshoot stating from coils,

Check Display Drive instructors (Coil) 4R7 : if defective replace it
Check the diode near 4R7 : if defective replace it
Check the filtering cap (Down side of diode) : if defective replace it

Hope this will be help you to bring back display.

Good luck!

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The display connector has no apparent flaws. If the 4R7 coil is damaged, would this result in no display at all or just the backlight failing? I have no display at all and want to establish whether replacing the LCD will solve the problem. How does one establish whether 4R7 coil and or diode are defective? Thanks.

由 Steve Song 完成的 2015年5月29日

Just replace 4R7 and Check the Display quality, any abnormal colors flicking comes you will have to replace diode too. when you going to buy the coil, most sellers selling full set of 4R7+Diode and Cap, actually this is level 2 repair :-)

由 Buddhika Mahesh 完成的 2015年5月29日

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iPad Air Wi-Fi

Replaced cracked screen. Ipad now doesn't turn on.

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