50g freezes on SD card access

[JDW]

A fellow 50g owner has tried multiple SD cards including one that was only 128 MB in size, in both FAT16 and FAT32 formats, only to find that his 50g locks up when he tries to access any of the SD cards. He confirmed there are no bent pins inside the SD card slot. He then made two videos showing what leads to the freeze as follows:

https://drive.google.com/open?id=1-mnRWe...fZxh2Ax-2E

After the calculator freezes (in the first video), he has to press the reset button on the back.

In the second video he put in the card with the calculator on and tried to open the file manager, but it froze until the card was removed.

I had him re-solder all 12 pins at the back of the SD card slot, but that did not solve the problem.

Someone in a Facebook group suggested I Google the industry standard SD card slot pin-outs and try to find a pin that has its logic state stuck and unchanging using an oscilloscope, but I am unsure what those logic states should be on the 50g. Do you need of you know? And even if my friend was able to determine that the logic state of one pin was unchanging when in fact it should change after an SD card is inserted, what then? I would assume that’s a chip level problem that cannot easily be fixed.

Any thoughts and suggestions would be appreciated. Thank you.