hello. I think I may have over supplied (voltage) on the limenet micro board, and now it won’'t power on. When we applied power I heard a ‘pop’ followed by a smell of electrical fire. when i try to use USB it says its drawing too much current. I can’t seem to find the issue or track down the correct regulator to test and replace.
Any suggestions?
I don’t own a limenet micro. But if I did I would start at page 2 and 15 of the Schematic and cross reference the Bill of Materials. The damaged chip is probably acting like a short circuit instead of a regulator, which may hamper your attempts to in-circuit troubleshoot.
The datasheet for the LMZ10501 DC-DC stepdown regulator specifies an input voltage of 2.7 to 5.5 volts and an absolute maximum of 6.0 volts.
The datasheet for the AP7361 ultra-low dropout linear regulator gives a input voltage range of 2.2V - 6V and an absolute maximum of 6.5 volts.
If I was betting I would guess that you melted one of the four LMZ10501 chips, but if the voltage was high enough, any of them could have failed.