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Ttl converter connection

Good morning, i have an enhanced 7" inch model display and i have one question: -i can upload the program in the display using only tx rx pins of a ttl converter and use an external power supply to turn on the display? (I think this tft need a little bit much power than usb port can deliver, i don't want damage the display or usb port accidentally!) thank you!
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Please refer to the appropriate data sheet for your Nextion

The recommended power supply is 5V, 2A.  Average current is a bit higher than 510ma.

This can increase under load.  Grounds with MCU and others need to be common.

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