Just Unboxed A Handheld, What Should I Check Before The Return Window Closes?

Smart to do this early. A structured check in the first few days catches nearly everything that would otherwise surface after the window closes. Here is the order I use for tournament hardware, adapted for a handheld.

Screen first. Show solid full-screen colours: black, white, red, green and blue. On black, look for lit dots; on white, look for dark dots. An OLED has no backlight to bleed, but do look for uneven tint in dark greys.

Then inputs: every button, both sticks, both triggers, the D-pad, the back buttons and the trackpads. For each stick, check two things. The resting value with hands off should sit within about plus or minus 0.02 on a new unit, and the full range should reach the edge evenly as you rotate slowly. Triggers should sweep smoothly from 0 to full. Steam's controller settings in Game Mode have a test screen that shows all of this, and our browser tests work in Desktop Mode if you prefer exact numbers.

Then the rest: speakers at moderate volume for buzzing, the headphone jack, the microphone, Wi-Fi and Bluetooth, charging from flat with the supplied charger, and fan noise during twenty minutes of a demanding game.

Write the results down with dates. If anything is borderline, such as a stick resting at 0.04, re-test a week later. A value that is climbing should go back while you still can.