Leakage current probably
I'm troubleshooting a few *really* weird hardware issues all at the same time. One of them just went away after wiping the board with isopropanol. wtf!?
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Sure. But from where to where?
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Been there. Done that.
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Bad solder joint somewhere?
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Are you using some other flux than “no clean”? If you have some conductive flux residue, cleaning with IPA would make a conductive path go away.
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All flux here should be "no clean", I didn't solder on this board recently, and usually I clean with isopropanol after doing any soldering work. I think wiping with isopropanol actually *created* a conductive path, temporarily fixing the issue. (probing stuff also works, grrr :)
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Perhaps the cleaning action perturbed a cold soldier joint or a piece of loose solder has now moved somewhere else...
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