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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-16-2021, 05:17 AM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Ah, "PMIC" is the proper acronym indeed. Good to know that older Samsung ones are susceptible to this. And I guess because the board does not boot both from sticking in a USB cable, nor using the power button is a possible indication that the PMIC may be defective, no?

So yeah I'm willing to put some more effort into actually diagnosing the problem. Although for something like micro-soldering I have nor the skills nor the equipment, so to do that myself would...

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Last edited by Ralphie; 12-16-2021, 05:33 AM.
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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-15-2021, 07:04 PM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Thanks for these pointers.

So I actually have a second, identical Samsung S4 Mini, which is working fine. It does not have the exact same ROM on it (from the mentioned thread) but one of the published versions there. The phone is not encypted: it says so in Android settings! So that very likely means that the faulty phone is unencrypted as well.

As for the ruling out if it's a board issue: good to verify indeed! With two phones that's easy: I put the board in...

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Last edited by Ralphie; 12-15-2021, 07:06 PM.
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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-15-2021, 05:39 PM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

That is indeed one possibility. A bonus however would be if I could actually boot it up and run the OS. So I'd like to go for that first. Since it came out with Android 4, I don't think this is encrypted. However, I put Android 10 on it by the work done in this thread: [url]https://forum.xda-developers.com/t/rom-i9190-i9192-i9195-l520-r890-unofficial-10-0-0-lineageos-17-1-for-s4-mini.4045147/[/url]

To your knowledge, what would be easier: this dead bug method or swapping...

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Last edited by Ralphie; 12-15-2021, 05:43 PM.
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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-15-2021, 05:29 PM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Thanks, those are cool videos and fund to watch . It's totally incredible what people can do with a seemingly unrecoverable mess!

I thought about encryption, but this is an old device so I don't think it's encrypted. If anyone knows of a way to know for sure, let me know....

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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-15-2021, 04:19 AM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Does anyone at least know if it is possible to "repair" the whole phone by just swapping the eMMC to a working motherboard?

I understand that in recent phones components may be paired to each other (so as to prevent this kind of tampering and inability to repair yourself). But wouldn't it just work after a successful reball for such a relatively old device?

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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-08-2021, 09:32 AM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Thanks for your reply. What do you mean with the CPU being paired to the CPU? You mean in software? I'm sure that's the case in new phone models, but this one is quite old. In fact, [URL="https://www.youtube.com/watch?v=08A6frM8v54"]in this Turkish movie [/URL]they just replace the eMMC for the S4 mini, because some board diagnostic shows it to be faulty.

They use super professional tools to do it in that film so I guess they know what they're doing. Does anyone...

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Ralphie replied to Samsung S4 Mini (GT-I9195) rev. 1

in Schematic Requests ONLY!

12-08-2021, 09:24 AM
Re: Samsung S4 Mini (GT-I9195) rev. 1

Thanks, but those are not real schematics. I'd like to see every part of the board. It's for this thread: [url]https://www.badcaps.net/forum/showthread.php?p=1088911#post1088911[/url]Re: Samsung S4 Mini (GT-I9195) rev. ...t1088911[/url]

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Ralphie replied to Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-03-2021, 06:52 AM
Re: Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

Anyone?

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Ralphie started a topic Samsung S4 Mini (GT-I9195) rev. 1

in Schematic Requests ONLY!

12-01-2021, 01:57 PM
Samsung S4 Mini (GT-I9195) rev. 1

For a possible repair/recovery job, I'm looking for the schematics for a Samsung S4 Mini (GT-I9195) rev. 1. Much appreciated if someone can get their hands on it (Boardview and schematics and anything else available)!

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Ralphie started a topic Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-01-2021, 01:49 PM
Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

For a while now I have an old Samsung S4 Mini (GT-I9195) lying around. It doesn't boot at all, gives no response whatsoever. It has some data on it still that may be useful to me however (I don't really know, maybe some old photos). Anyway, mostly for the fun of it I want to try to get the data.

Now I'm not particularly skilled at working electronics, so actually fixing the device is something that probably will be quite difficult (if I want to do this myself). I don't even know where the problem is on the motherboard. It's probably some kind of chip that is broken, or a short on...

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Last edited by Ralphie; 12-01-2021, 01:59 PM.
Ralphie replied to New Members - please post your introductions here

in Announcements & Related News

12-01-2021, 08:33 AM
Re: New Members - please post your introductions here

Hello electronic experts! I've come here to ask some questions about a phone that I'd like to revive for fun. It seems a very nice place here with knowledgeable people!

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Samsung S4 Mini (GT-I9195) rev. 1

Data recovery on an old Samsung S4 Mini - Teach me some interesting electronics!

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