That's connected to regulated 5v source. Connecting to the unregulated power source is not bad for the console, it bypasses everything. Putting strain on the regulator with the high current draw from an EMS cart and a backlight is damaging to the console.
Ah damn, thank you for pointing this out! I'm a bit noob on all these different solder points, which ones are considered the best to drive my nonelectronics V5 without having to add resistors etc. ?