I have a SIM800L module. It was working fine but I messed up with the power supply (it is advised to disconnect the ground after vcc otherwise the module may use the low voltage serial pins as ground causing damage to the module. ) However, I did not know it . Now my module doesn't work anymore.
No blinking LED
VCC and GND pins are shorted.
My guess is the voltage regulator might have been fried up.
Can you please troubleshoot the issue, which part might have been broken and which part to replace in order to fix it ! Thank you