A dead console is usually one small part: a capacitor shorted to ground, a blown fuse, an open resistor. This guide walks the power path of the New 3DS XL motherboard with a multimeter, point by point, on real photos of the board, until the faulty part has nowhere left to hide.
The symptom tells you where to start. Pick the one that matches; every route still begins with the battery and charger checks in phase 2, because they're quick and they rule out the cheap answers.
Most dead boards that aren't water-logged or smashed die of a short to ground: a ceramic capacitor cracks or a chip fails, and a power rail is tied straight to ground. The protection trips or the battery is dragged down, and nothing starts. A meter finds that in minutes.
Everything the procedure uses, from the first screw to replacing a capacitor. Tick items as you gather them; ticks are saved in this browser.
Almost every test in this guide is one of four meter modes. This is how to read each, and what counts as a fault. Board power is off (battery out, charger unplugged) for everything except the voltage checks.
Diode-mode readings depend on your meter's test current, so two meters can differ by 10–20 % on the same point. Compare readings taken with the same meter. Resistance readings on a rail with capacitors climb while the meter charges them; that drift is a good sign, not a fault.
Scroll. The panel follows you: real photos of the board with the probe points marked and the reading you should see, and animations of what the meter is actually measuring. Each animation runs as you scroll through its step.
On a keyboard: J / → next step, K / ← previous, L readings log, M cheat sheet. Callouts marked + open on a click.
Type each reading as you take it. The verdict column compares it with the expected range; readings are saved in this browser, and the page prints as a clean log sheet. Units are understood: 450 mV, 0.35 A, 120m (mΩ) and OL all work. You can also type readings straight into the step cards.