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I have a problem with an SIM800L module. I tried to connect the SIM800L to the network, but it does not connect. The LED should flash 3 times per second, but it slowly flashes 9 times, then turns off, then 7 times, then turns off again, and the cycle repeats.

The power source that I use is 4 VDC, 2A. I connected a capacitor to the power pins.

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GND and NET are short-circuited, is this normal? I tried to unsolder an external antenna connector and cut the wire, but it did not help.

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I got a new module, but the problem remains. Could the party be defective?

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Everything worked, I read the forum about the same problem, but I did not think that this could be. In another chat they suggested: The antenna can easily ring to the ground, but it's better not to ring the antenna input of the chip

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  • \$\begingroup\$ you should never have an antenna shorted to ground \$\endgroup\$
    – diegogmx
    Apr 17, 2020 at 15:54
  • \$\begingroup\$ How did you solve the blinking problem? \$\endgroup\$
    – Fedy2
    Jan 14 at 21:14

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