Your phone or laptop suddenly stops charging over USB-C. You plug in the cable, nothing happens. No LED, no charging indicator, nothing. Your first instinct is that the charger is broken. In 9 out of 10 cases, it is not broken—it is a connector issue or a power-negotiation failure between the charger and your device.
USB-C chargers are more complex than older USB connectors. They negotiate power delivery over a two-way handshake between the charger and the device. If that handshake fails, the charger gives up and delivers zero power, even if the charger and cable are physically fine. This silent failure is by design—USB-C power delivery is safer this way.
Why USB-C Charging Fails Silently
When you plug an older USB-A charger into a device, it delivers power automatically. The device takes what it needs. USB-C works differently: the charger asks the device “how much power do you need?” and waits for an answer. If the device does not respond, or if the charger does not understand the response, the charger shuts down to avoid damage. This negotiation happens in milliseconds, so you never see it. You just see a dead charger that you assume is broken.
But the problem is usually not the charger—it is a broken connector pin, a cable fault, an outdated charging circuit in the device, or a firmware issue that prevented the handshake. The charger is doing exactly what it is supposed to do by refusing to deliver power when the negotiation fails.
The Six-Step Checklist
Step 1: Clean the USB-C Port on Your Device. Lint, dust, and oxidation accumulate inside the USB-C port. A corroded pin inside your phone’s charging port prevents the device from responding to the charger’s handshake. Take a dry toothpick or a plastic USB-C connector cleaner and gently scrape the inside of the port. Do not use water or isopropyl alcohol. Do this carefully—the pins are delicate and easy to damage. This fixes 40% of “dead charger” problems because port corrosion is extremely common.
Step 2: Try a Different USB-C Cable. The cable, not the charger, is often the culprit. Cables fail more often than chargers because they are bent, pinched, stepped on, and dropped constantly. Borrow a cable from a friend and try it. If the charger works with a different cable, your cable is broken, not the charger. Replace the cable and you are done.
Step 3: Clean the Charger’s USB-C Port. The charger’s connector can also corrode or collect lint. Clean the USB-C port on the charger itself using the same toothpick method. Oxidation on the charger’s pins prevents contact with your cable and breaks the power delivery handshake.
Step 4: Unplug Everything and Wait. Power on/off cycles can reset the negotiation process. Unplug the charger from the wall outlet. Unplug the cable from your device. Wait 30 seconds. Then plug the charger back in and connect the cable to your device again. This forces both sides of the handshake to restart from scratch.
Step 5: Try a Different Charger or Power Adapter. If you have access to another USB-C charger (from a laptop, tablet, or friend), try it. If a different charger works, your charger is dead and needs replacement. If no charger works even with a clean port and new cable, the problem is your device’s charging circuit or logic board.
Step 6: Update Your Device’s Firmware. In rare cases, a device firmware bug can break USB-C power negotiation. Connect your device to Wi-Fi and check for updates. Installing the latest OS or charger-related firmware can sometimes restore charging. This is a last resort, but it has worked for some users with older devices.
When to Replace the Charger
If you have tried all six steps with a different cable and a different charger, and nothing works, the problem is your device—not the charger. Your phone or laptop’s charging circuit may be failed. At that point, see a technician. Do not keep trying different chargers because the problem is internal to your device.
See USB Power Delivery specifications and browse our tips homepage for more device troubleshooting. Related guides: managing streaming subscriptions and controlling Windows updates.
The fastest way to test is to borrow a charger or cable from someone and try it immediately. If charging works with the borrowed equipment, you know exactly what to replace and save the cost of unnecessary repairs.