NodeMCU Voltage Regulator Fix

Fried my NodeMCU's 3.3v regulator by mistake, then fixed it quite simply

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I accidentally fried something on my nodemcu board, but had no idea what (magic smoke, etc.). The usb serial bridge (CH340) still worked, and programming from the Arduino IDE seemed to be ok, so I tried saving the board. A bit of poking around with a multimeter found that the 3.3v line was very low at roughly 1.5v. First had to locate the offending regulator, then cut it out from the board (soldering would have taken too long, and I just got a new pair of wire cutters). Soldered an LM1117T-3.3 regulator I had directly to the external pins (verified before that the 3.3v line was the same at the regulator and pin), and the board is alive and well.

First picture shows original board, burnt 3.3v regulator right above the yellow capacitor.
Second picture shows old regulator cut out and new regulator soldered in.
Third picture shows another angle of the new soldered regulator.
  • 1 × NodeMCU
  • 1 × LM1117T-3.3

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Saint Skinny wrote 02/07/2019 at 14:25 point

Thanks for adding this! I've been having some issues trying to run my NodeMCU via USB, so I picked up a couple types of regulators. One LM1117T-3.3 and two MCP1700. Hopefully I can get over the issues with one of these in the mix. 

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