S4 Mini i9195 only vibrates, ODIN mode boots, data recovery

[krater42]

Hello,

my Galaxy S4 Mini GT-i9195 died last weekend out of nothing. Battery was empty, I started it, it boots and switched off again. After I tried to charge it, nothing happens but when I longpress the power button it vibrates one time and the screen stays black.
The phone has TWRP and LineageOS on it and worked fine for some years.

What I've done and what I know:
1) Changed all but the main pcb, I have the same device again and switched all other parts. Same issue, so I'm sure the issue is on the motherboard.
2) Meassured battery current when off 0mA, when on 130-180mA
3) Meassured voltages, 1.8v and 3.0v are there when I switch the phone on
3) Meassured CMD pin on eMMC, the CPU is alive and tries to access the eMMC

What I don't know currently
1) Is the eMMC working correctly
2) Is any other hardware defect?
3) Is there some data corruption on any part of the eMMC?

Before I try to solder something on the phone I would like to test all other ways to recover my data.
The hardware itself is not important, but it would be nice to get the data. The SDcard that was used looks like the data is encrypted, so I suppose the userdata on the eMMC is encrypted as well. This means I hope to get the phone to boot to decrypt all this again.

I've seen that it could be possible to boot the phone from SDCard. Does anyone know how this oculd work?
I have a universal eMMC reader that supports the eMMC used, but don't know if it will work as long as the CPU is powered on.

Has anyone a idea what could be defect or how I can do a further diagnose of the phone to resuce my data?

Hope someone can help. Thanks!

 

[V0latyle]

@krater42 Welcome to XDA. When you joined, you agreed to follow the Forum Rules. Please take a moment to review them now, with special attention paid to Rule 5:

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The duplicate post you created will be removed.

 

[krater42]

Sorry for that, read the 5. rule too late. What do you think, were is the best place for this topic? Which one should I delete?

 

[V0latyle]

Sorry for that, read the 5. rule too late. What do you think, were is the best place for this topic? Which one should I delete?

Your question is on a Galaxy S4 Mini. This is the right place. We have already removed the duplicate.

 

[krater42]

Okay, new information. I ****ed up the key combination and now as I do it right, I can boot into ODIN mode.
I tried to read out the pid with heimdall and this doesn't works. On the other phone I tried the same and it works. So I suppose it's not a issue of my setup.