The "stuff" is capacitors, resistors, transistors..., that works in low volt and current.
so when the wire touch them it close electric circuit with 5V and 500mA so they failed/"burnt".
my best advise buy a new ereader.
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How can one measure if a motherboard is fried? With a multimeter...
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I don't know which test you can do check if the motherboard is fried With a multimeter.
The four pin in the board are the same as in USB port so if you connect them to a power source the board need to work.
did you try wire the other places?