Symptoms
- Laptop connects to the dock but battery keeps draining
- Charging indicator doesn't appear when docked
- Charges slowly through the dock compared to its own charger
- Charges fine when plugged in directly, not through the dock
Likely causes
- CommonDock doesn't supply enough wattage for the laptopMany docks only pass through a limited amount of power, less than what a larger laptop needs to charge under load.
- CommonDock's power adapter not connected or insufficientThe dock itself needs adequate external power to pass through charging to the laptop.
- CommonUSB-C cable doesn't support enough power deliveryNot all USB-C cables support high-wattage charging, even if they support data and video.
- PossibleLaptop being used under heavy load while dockedIf power draw exceeds what the dock provides, the battery can still slowly drain even while 'charging.'
- Less commonFaulty dock charging circuitryDock hardware can fail specifically in its power delivery component while data/video still work.
What to do
- Check the dock's specifications for its maximum power delivery wattage and compare it to your laptop's charger wattage.
- Confirm the dock's own power adapter is plugged into a wall outlet and functioning (check for a power light on the dock).
- Try a different USB-C cable rated for high power delivery (65W or higher, depending on your laptop).
- Reduce the laptop's workload (close demanding apps) to see if charging improves under lighter use.
- Test the laptop with its original charger directly to confirm the laptop's charging system itself works.
- Check for a firmware update for the dock from the manufacturer.
- If the dock is rated for enough power but still won't charge, try a different laptop with the dock to isolate the fault.
Tools and parts
- None
High-wattage USB-C charging cableSearch: “100W USB-C PD cable”
When to call a pro
If the dock is rated for sufficient wattage but still won't charge a known-good laptop, the dock's power delivery circuitry has likely failed and needs replacement or warranty service.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.