Original topic:

Fold4: SIM1 not recognized and internal screen not working

(Topic created: Tuesday)
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TriplePe
Constellation
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Fold & Flip Phones

Hi All,
Has anyone one got such issues like in subject?

1. After previous of Samsung Software Update my SIM1 did not work correctly. It was not recognised but it was inserted. When restarted it worked for couple minutes and then was the same problem again. I checked if SIM work in another phone and it worked perfectly fine. I had to changed SIM for eSIM as quick solution but I am using two SIMs and it was temporary to the issue.
Finally, I updated on the last update Z Fold4 on 18 Feb 2025 as though that might be with bugs for the SIM issues. However I get another issues.

2. After the last of Samsung Software Update I have a internal screen issues.
When I try to go from external to internal during of usage of the phone internal gets black when fully opened.
When opening the internal screen and is reached around 90 degrees of opening it functions normally. However when it is opened fully, or when opens more than 90 degrees, it turns black and stops working, functioning. It does not respond to clicking and knocking on the screen and pressing power button.
After that when closed and back to the external screen, the external screen also turns black and does not respond to repeated clicking and pressing of the main power button for a while. It is until power button is double clicked and camera is on.

 

I have never did have a problem like this before and everything happens after lasts two Samsung Software Updates. The mobile device/phone worked perfectly fine until the last two software updates.
- I tried to many things as advices in troubleshooting process.
- I reported the problems/issues via Samsung Members Error Report App with no solution replay for last two weeks.
- I reset to the Factory data reset.

Has anyone get the same issues recently with Z Fold4?
I would be glad with any help, please.

4 Replies
jerene
Constellation
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Yes, lots of issues!
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neilth
Supernova
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It sounds like your almost three year old Z Fold 4 likely has failing internal ribbon cables. You should attempt to run the phone diagnostics here in the Members app.
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TriplePe
Constellation
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There is no issue with how old the phone is. The phone worked perfectly fine before updates of Samsung Software. The phone is in very good shape too.
I also run the diagnostic as much as I could.
It shame that via 'Flow' App everything seems to be OK and ether external or internal screen works fine via PC. However at the same time the internal screen on the phone itself does not light up. It is still permanently black.

Though, If there would be any chance to revert updates, phone would work fine as used to do.

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Samsung_Moderator
Community Manager
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Hello TriplePe, Welcome to the Community. We understand how upsetting it is to start experiencing concerns with the phone such as not recognizing the SIM and the screen remaining black. 

We actually have solution threads already posted for both of these concerns. 

1. SIM1 not recognized: https://us.community.samsung.com/t5/Fold-Flip-Phones/Phone-cant-wont-recognize-SIM/m-p/2481615

2. Internal screen remains black: https://us.community.samsung.com/t5/Fold-Flip-Phones/Internal-screen-on-left-is-blinking-and-going-b...

Service information is included with each thread should you choose to have your Fold 4 evaluated. 

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