Micro SD

[sempre]

Hi to all!!

sandisk 16gb

only recognizes 31 mb and heats up the chip...

Data recovery? $$?

Waiting replys!!

[HaQue]

will need to do monolith recovery and possibly cut traces to controller to stop the possible short interfering.

[jermy]

Before you go into the route of chip off recovery (research pinout ...), try if you can fix it using a multimeter and a soldering iron

[HaQue]

I don't think he has a microscope and decent milling station to drill into a microsd to fix it, would be quite a challenge for the inexperienced to diagnose and remedy.

[lcoughey]

Before you go into the route of chip off recovery (research pinout ...), try if you can fix it using a multimeter and a soldering iron

Do you follow this method with microSD cards?

[fzabkar]

will need to do monolith recovery and possibly cut traces to controller to stop the possible short interfering.

If the "chip" heats up but the card is still detected, albeit with incorrect capacity, doesn't this suggest that the controller is probably OK and that there could be a physical problem with the NAND or its supply voltage?

[pcimage]

will need to do monolith recovery and possibly cut traces to controller to stop the possible short interfering.

If the "chip" heats up but the card is still detected, albeit with incorrect capacity, doesn't this suggest that the controller is probably OK and that there could be a physical problem with the NAND or its supply voltage?

Yes, all Sandisk micro SD cards behave this way then the controller is OK but the flash is either degraded or inaccessible. In this case (heating up) there will be a short somewhere IMHO

[HaQue]

will need to do monolith recovery and possibly cut traces to controller to stop the possible short interfering.

If the "chip" heats up but the card is still detected, albeit with incorrect capacity, doesn't this suggest that the controller is probably OK and that there could be a physical problem with the NAND or its supply voltage?

It could. Or not. The issues include: how much time and money are you going to invest in this one case. Monoliths, microSD are not the easiest package to diagnose, and I don't think it is worth looking at the laptop or card readers supply voltage. How many people on here have the tools and skills to drill, mill, scrape, dissolve or laser away a microSD coating carefully enough to not damage anything, then diagnose, repair?

The quickest, easiest option is to forget it from the start, wire it up, read the NAND and attempt DR that way.

It only takes 1 resistor or cap to lose spec and your Flash circuit could become wonky. Often there is no physical evidence of it even if you could get inside the monolith.

I would be interested to watch a discussion / progression of a diagnose and repair of a microSD circuit though, if it were possible to guide someone through it over the forum.

[HaQue]

will need to do monolith recovery and possibly cut traces to controller to stop the possible short interfering.

If the "chip" heats up but the card is still detected, albeit with incorrect capacity, doesn't this suggest that the controller is probably OK and that there could be a physical problem with the NAND or its supply voltage?

Yes, all Sandisk micro SD cards behave this way then the controller is OK but the flash is either degraded or inaccessible. In this case (heating up) there will be a short somewhere IMHO

Agree, and Kingston MicroSD's are renown for this too. I didn't specifically call out the controller, I should have said isolate the nand from the rest in case there was a short in controller, or associated discreets. a lot of controllers now contain most of the components that used to be external for timing and configuration, so not a stretch to think only a small part of the controller circuit is damaged internally.

I still believe chip-off recovery the easiest and quickest. Unless you wanted to risk using a MPTool to see if it is firmware - but you risk your data immensely, and opening the microsd up to diagnose circuit would also be a massive risk IMHO.

[sempre]

look!!!!

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