I have been trying to set up the SIM800L. The LED is not blinking...

I am using the LM2596 to convert from 5V to 4.3V (I did try with 3.7 <= Vout <=4.3 V) to power the module. With a 5V/2A power supply nothing works aswell.

enter image description here

Any ideas? Thanks in advance!

  • Have you tried connecting it to an Arduino at any point?
    – Majenko
    Commented Oct 27, 2020 at 17:00
  • is the LED supposed to blink?
    – jsotola
    Commented Oct 27, 2020 at 17:40
  • Yes, I did connect to test AT commands. The LED should blink since I am powering the module.
    – Tom Carter
    Commented Oct 27, 2020 at 18:15
  • have you checked the power supply voltage at the SIM800L module power pins?
    – jsotola
    Commented Oct 27, 2020 at 18:40
  • the soldering job on the module pins looks questionable .... please provide a clear closeup of the module
    – jsotola
    Commented Oct 27, 2020 at 18:41


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