You can check which stage the console is stuck at by probing emmc data pins if you have an oscilloscope/logic analyzer, or by measuring current draw. Here's a detailed guide:
https://www.retrosix.wiki/emmc-booting
Pretty sure the problem is the emmc chip. You can buy replacement ones on aliexpress for about $10
Unfortunately, I don't have such strumentation.
I have tried desoldering everything, cleaning the CPU of any residue and booting but it makes no difference. The impedances, in continuity mode of the multimeter, look good on the CPU (I tested condensators in the row where I soldered).
I then tried installing the chip from scratch but unfortunately I still get *==.
So anyway, I have to think that the power supply is there somehow, because the chip is supplying power.
It scares me that the signal ("poor wiring, or dead CPU") is in the second case.
So if I get a new clean emmc and plug it in, if the CPU is still technically alive, I should be able to go back to the "No sd card" screen, right?Pretty sure the problem is the emmc chip. You can buy replacement ones on aliexpress for about $10. You also need mmcblknx, regular emmc to sd card adapters won't work, it has to be a realtek chipset one iirc so it can write to boot partitions. Or you can use emmc programmer if you got one.
You can generate boot0/1 partitions with EmmcHaccGen, and I believe that's the minimum requirement to boot a switch to hekate with modchip. Then you can follow through the emmc rebuild guide and see if you can recover your original emmc partitions, otherwise you won't be able to play online anymore.
And then I would be able to rebuild the emmc in any case but I cannot go online unless I recover the keys from my (possibly) dead emmc.
If yes, for such work I can get any emmc on Aliexpress or should I take a specific one (exactly as mine?)
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What I don't understand is the way it got corrupted: it worked until I've closed the black cover. Rechecking, I don't think a short could be between emmc and modchip by touching each other. I am more thinking if maybe the soldering on capacitors did touch the metal cover somehow.