Try, if you can, to power your router with another 12V/2A power supply.

 

I had a similar problem with an old TP-Link router, the power supply seemed to provide (good?) 12v but the router would not boot properly, replacing the power supply was the solution for me.

 

Few years later, I opened the router case because USB port don't working properly (USB 3G sticks weren't powered anymore by the router) and found a bad capacitor inside (I've replaced by a new one).

Thanks for the reply friend . . . I tried with two different adopters with router's required input parameters, but it still with the same issue. Thanks again buddy . . .

Did you tried to:

 

- do a FACTORY RESET by pressing the reset button 10 seconds?

 

- remove the SIM card and reboot without it?

yes bro . . I tried this too

I think there are some more peoples here with the same issue . . . check out this link:- https://community.tp-link.com/en/home/forum/topic/112088

@Shaan15 

 

If the MR200 is not covered by TP-Link warranty anymore, you can try to open it.

Perhaps, you'll find a bad capacitor with bulge inside. If so, then you should try to replace it.

 

 

To give an example, I'm using this picture found on the Internet showing inside of TP-Link MR6400, maybe the MR200 is similar?

 

 

By example, if you find a bad 1000 uF/16v 85°C, replace it by a good 1000 uF/25v 105°C (for better voltage and temperature resistance).