Screen does not work after replacement

Question

Samsung Galaxy A12

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.

20回答すべてを表示

Gavino Santu @most99

評価: 115

3

投稿日: 2023年12月12日

オプション

Screen does not work after replacement

Good evening, everyone.

The phone in question fell (the owner said he doesn't know exactly how and where it fell).

After replacing the diplay, including the frame, the phone continues to behave abnormally. I reopened everything and checked to see if any of the connectors were miswired, but everything seems fine. I disconnected and reattached the cable connecting the display and cleaned it with isopropyl alcohol. It continues to behave in the same way.

The site from which I got the display is https://www.e-pol.it/ . I find it reliable, I have always been comfortable with it, had already ordered the same and identical item and repaired another Samsung Galaxy A12 without any problems.

I leave attached a video showing the way the phone behaves (I put my hand in front to cover a child's face in the screen lock picture) and photos of the internal components: https://drive.google.com/drive/folders/1...

UPDATES 19/12/2023

So I have some "updates." In disassembling and reassembling, I noticed that the cables have different initials:

- The abbreviation of the new display is "SM_AO22F."

- The abbreviation of the old display I replaced is "SM-127F".

I leave attached photos: https://drive.google.com/file/d/1sN9wLwy...

I saw that the site sells two types of displays, one with FLAT A022F and the other with FLAT A127F. I don't really know the difference, I have asked here on iFixit in the past and was told that some "components" of the Samsung Galaxy A022 display can interchange with those of the Samsung Galaxy A12.

(see here: What is the difference between these two types of display?)

Remembering that I have another Samsung Galaxy A12 at home that is fully functional, I went to check what initials it had and it has "SM-127F," which is that of the old display.

My suspicion is that they sold me the wrong display or otherwise got something wrong (I am sure I ordered the one with FLAT A127F, I have the proof in the order history). My idea to see if this is indeed the case, or at least to rule it out, is to try to put all the components in this other fully functioning display as soon as I can (I'm replacing piece by piece from one frame to another). If everything works, the problem is the display.

I will let you know, In the meantime if you have anything to saugger me I would be grateful.

この質問に回答する同じ問題があります

この質問は役に立ちましたか？

はいいいえ

スコア 0

コメントを追加

2件の回答

Ottobunny @ottobunnycoder 評価: 689 10 1 · Answer 1 · 2023-12-12T16:28:18-07:00

最も参考になった回答

Ottobunny @ottobunnycoder

評価: 689

10

1

投稿日: 2023年12月12日

オプション

You may want to get a new display. If you still have the origanal display, see if you can put that on, and if it works like normal, then it will be a display issue. If it does not, it could be the connector on the logic board, or the phone's GPU.

このアンサーは役に立ちましたか？

はいいいえ

スコア 2

8 件のコメント:

The old display I replaced no longer worked, so I replaced it. The new one I purchased did not either, and it is also original.

The article is this: https://www.e-pol.it/store/product-list/...

It is an Italian site, I find it reliable, I have always used it and never had any problems.

The phone fell on the ground, is it possible that the video card broke? I don't know.

The old display didn't work but I remember it behaving a little differently. If it helps I can replace and put the old one back on and send a video of how it behaves.

Gavino Santu さんによる2023年12月13日

I don't think that it would be likely that the Graphics Processor in the phone broke, as that is part of the phone's APU chip. It could be the cable connector? Check to see that it is cleaned, and all pins are in place. A picture of the logic board might be nice.

Ottobunny さんによる2023年12月14日

Find everything here: https://drive.google.com/drive/folders/1...

If you can use anything else please tell me.

Gavino Santu さんによる2023年12月14日

@most99 Could you take a picture of the screen cable connector? That way I can see if all pins are in the correct position.

Ottobunny さんによる2023年12月15日

Not being sure which cable you were referring to specifically, I took a picture of both. I also took a video, it looks to me like there's glue around it, maybe even between the pins, I wouldn't want that to be a problem. I hope it shows well...

https://drive.google.com/drive/folders/1...

Gavino Santu さんによる2023年12月16日

3件以上のコメントを表示

コメントを追加

Eric Johnson @ericjohnso94470 評価: 1 · Answer 2 · 2024-09-02T15:41:19-07:00

From the situation you've described, it appears the primary issue might stem from an incompatibility between the replacement display and the phone's original hardware. Here are the key points and steps to diagnose and potentially resolve the problem:

**Problem Analysis:**

1. **Display Incompatibility:**

- The original display that was replaced had the model number "SM-127F," while the new display has "SM-A022F."

- Samsung Galaxy models sometimes have slight variations between different batches or regions, leading to different connectors or pin configurations. Even if the parts appear similar, they might not be fully compatible.

2. **Possible Connector Issue:**

- You mentioned there might be glue around the pins of the cable connector. If glue or any residue is present between the pins, it could prevent proper contact, leading to the display not functioning correctly.

3. **Potential GPU/Logic Board Damage:**

- Since the phone fell, there’s also a possibility of damage to the logic board or GPU, which could cause the display not to work even if the display itself is fine. However, this is less likely compared to the other issues.

**Steps to Diagnose and Fix:**

1. **Check Compatibility:**

- First, confirm the exact model of the original and replacement displays. If you ordered the wrong model, you may need to return the display and get the correct one (SM-127F for your device).

- Use the other functional Samsung Galaxy A12 to test the new display. If the new display doesn’t work on the fully functional phone, it confirms that the display itself is incompatible or defective.

2. **Inspect and Clean Connectors:**

- Carefully inspect the connectors on both the display and the logic board. If there’s glue or debris, clean it off using isopropyl alcohol (90% or higher) and a soft brush. Ensure the pins are not bent or damaged.

3. **Test with the Old Display:**

- Even though the old display is broken, if it can still show some signs of life, reconnect it to see if it behaves differently than the new one. This can help determine if the problem lies with the new display or elsewhere in the phone.

4. **Check for Other Hardware Damage:**

- If possible, check the logic board for any signs of physical damage. Look for cracks, burnt components, or loose connections. This might require a professional if you're not experienced with hardware repair.

5. **Consult a Professional:**

- If after cleaning and testing the components the problem persists, you might need to take the phone to a professional repair service. They can conduct more advanced diagnostics to check for issues like a faulty logic board or GPU.

**Next Steps:**

- If you identify that the display is indeed the wrong model, contact the seller to arrange for an exchange or return.

- If cleaning and testing the connectors solve the issue, you can proceed with reassembling the phone.

- If none of these steps work, consulting a professional is advisable, as they can perform repairs or further diagnostics beyond basic troubleshooting.

This approach should help you systematically identify the root cause and get your phone back to working condition.

Samsung Galaxy A12

Screen does not work after replacement

2件の回答

回答を追加する

プレビュー