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The Galaxy A12 is a low-end slate Android smartphone released by Samsung in November 2020 as a successor to the Samsung Galaxy A11. Identifiable by model number SM-A125 (followed by version/carrier-specific character.

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Newly installed screen wont work.

My father-in-law's Galaxy A12 screen cracked and I gave it a go to replace it. I have successfully done it a couple of times on iPhones. I ordered a new screen (without frame) and I followed all steps in this video (https://www.youtube.com/watch?v=ExGSpQZv...). Afterwards it would not light up although I felt the start up vibration. Unfortunately, I had not tested the screen by simply connecting it and starting the phone to rule out a faulty screen at delivery, although when I reconnected the old, cracked screen it did lit up at start-up so obviously there was no major hardware fault causing the black screen.

I ordered a new screen replacement and this time I "hardly touched it" before simply connecting the two screen cables, reconnecting the battery cable and the "power on button cable" and started the phone, but no picture. I connected the phone to my Macbook which found the phone and automatically started the Android File Transfer app. Also, I could hear chimes like messages dropping in. So, obviously, the phone works but neither of the two new screen replacements lit up, they are completely black.

What am I missing? Could they both be faulty at delivery? Could I have trashed them both when handling them? It should be simple: when connecting the new screens to the phone – no picture – but when I connect the old, cracked screen in the exact same way – light (no picture since the screen is all cracked).

(Also, there is blue protective plastic behind the screen cables, under the plastic there is glue. When I remove the plastic, the cables can be stuck to the back of the screen. Is this essential for it to work? Or is it just for fixing the cable and minimizing movement?)

Отвечено! Посмотреть ответ У меня та же проблема

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Hi @jonatanekstedt

Can you detect any images on the new display if you shine a flashlight at an angle close to the screen when the phone is on?

If not, then there's a problem with the screen.

Since the original display still lights up, but with no images, the systemboard and flex cable seem to be OK so I was wondering if you have got the correct display module for the phone.

The Samsung part number of the Galaxy A12 (SM-A125F) LCD + digitizer module is GH96-14116A so hopefully you didn't get the display module for a Galaxy A12 Nacho also known sometimes as a Galaxy A12s (SM-A127F) which is GH82-26486A GH82-26485A (for the BOE flex version) or GH82-26925A (for the LTPS flex version).

There's got be be a reason why the displays have different part numbers otherwise they should be able to use the same one for both models.

If you got the wrong one, search online using the appropriate part number only, to find suppliers that suit you best.

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No image with the flashlight. But I now realize that the cracked screen is a A127F model. And the new ones are A125F. That might be the problem, then! I’ve ordered a A127F one now, hopefully that resolves the issue.

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@jonatanekstedt

Hopefully it will.

Please update back here one way or the other (works or not) as it may help others in the future who run into the same problem

Cheers

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It worked! I simply ordered the wrong version of the screen.

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Jonatan Ekstedt будет вечно благодарен.
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