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Why does my lcd work only for a few seconds after switching around lcd

So a while ago a took on the challenge of repairing a broken digitizer on a ipad air 1(Never again), the digitizer was extremely cracked so i ended up carving every piece of glass out as carefully as possible but little did i know i broke the LCD so i ordered a digitizer and LCD and plugged them in and well the LCD didn’t have a back-light, so ordered another LCD did the same thing still no back-light, so i determined after hours of troubleshooting it was a blow filter, i don’t know how to micro solder so i sent it in for repair and i got it back and Great the back-light works but only on the first two LCD’s now this would have been fine but the first is screwed up from me carving glass, and the second one well i made the mistake of thinking the top layer of plastic was a scratch protector and realized i just pulled off the only thing that separates our vision from the back-light, so now i’m down to one LCD to test and when i plug it in it worked for about a millisecond after a hard reset, it only does this after being put in previous to one of the first to LCD’s so it doesn’t work consecutively on the third LCD. So yeah long story short i couldn’t find anything in any forums for such an odd issue. I don’t understand why the LCD works for half a sec and then doesn’t, and also its not the back-light its almost as if the screen just turns off.

p.s if you don’t understand something i said ask me cause i typed this up in about 5 mins.

I have tried the following to fix the problem(other than what i said above)

-Factory reset w/ itunes

-disconnecting everything and reconnecting.

-charge overnight

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Sounds like you had a rough time :>). I guess you don’t want me to say that the Air is one of the easier iPads to work on…oops!

I feel your pain…as all of us who worked on iPads do because we all damaged LCD’s at one point or another. They are incredibly easy to damage. LCD’s usually do come with a protective plastic sheet.

If you feel the backlight is okay, then the issue is with the LCD driver circuit. It could be as simple as another blown filter or it could be more upstream damage. When you sent out iPad for micro-soldering repair, did you send the whole ipad or just the logic board. I try test everything, even when doing a simple backlight filter because iPads are a lot harder to seal/un-seal and its a pain for customers to find out too late that more than one thing is damaged.

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I sent the ipad with the EMI Shield digitizer and LCD removed.

Edit: I do believe the back-light is fine now, i don't think it is a problem with another filter because the second lcd Works its just missing the top layer that grays the backlight to see the displayed images. So im guessing its either some weird ass software issue or my lcd it self because like i said it works for a second and the screen just dies no back-light or anything. I would like to avoid ordering another LCD cause i have already put way more money into this than i need to, LCD's for this thing are quite expensive as the cheapest i can find them are like 80$.

And yeah i know this is one of the easier ones lmao thats why i was surprised when i ran into so many problems, the only good thing about this is now i know pretty much exactly how a ipad works(who knows maybe it will be useful one day).

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One more question I just added two pictures to my post for you to look at it is the second LCD the one i accidentally tore the top layer off of, what is this top layer called and can i buy it and put it on the LCD since the second one DOES work.

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Sorry, bu that LCD is toast...it's only good for testing purposes now.

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Both the LCD's are shot?

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What happened to the first one again? It got damaged when you removed the glass shards?

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The Lonely L さん、ありがとうございました!
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