Not sure which “chip near USB” you might be referring to.
Schematics are here:
Probably a power regulator device (a guess, they are in that area.
Do you have something connected to the 12V fan connector?
tinyG sitting on dry cardboard should be OK (I assume that is what you meant).
it is possible to replace components, but power devices (regulators, stepper drivers) are soldered to ground plane for heat sinking, so need a lot of heat to be removed and replaced successfully.
BTW, when you say current limited to 2.5A – by the Power Supply?
2.5A might not be enough for 4 active NEMA23’s – you might be causing the PS to drop out.
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This reply was modified 8 years, 3 months ago by cmcgrath5035.