Why Doesn’t My Monitor Work Properly with a 66W USB-A Fast Charger?Updated 7 minutes ago
If your UPERFECT monitor doesn' t power on or function properly with a 66W USB-A fast charger, the issue lies in the charging protocol, not the wattage. You might have questions about this, and we'll explain the details in this article.
Why USB-A Fast Charging Doesn't Work
- Different protocols: USB-A fast chargers (like QC or SCP) are designed for phones and small devices. They use proprietary charging methods, not the universal USB Power Delivery (PD) standard.
- Fixed 5V output: Without PD negotiation, a USB-A port usually only delivers 5V. Even if the charger is rated at 66W, your monitor may only get about 15W.
- No PD handshake: UPERFECT monitors require PD communication to activate normal working mode. Since USB-A lacks the PD handshake, the monitor can't recognize it as a valid power source.
- Connector limitation: PD works only through USB-C. The USB-A port physically cannot carry the PD signal.
USB-C Plug Pinout (Supports PD Protocol)
USB-A Plug Pinout (Does Not Support PD Protocol)
What Your Monitor Actually Needs
- Protocol + power: The monitor needs both enough wattage and the correct PD protocol.
- Minimum requirement: At least 15W (5V/3A) is needed when the monitor is handling both video and power through the same cable.
- Recommended headroom: A 30W (or higher) USB-C PD charger ensures stable operation and leaves room for extra features.
How to Fix the Issue
- Use a USB-C PD charger. Look for one rated at 30W or more.
- Connect with a USB-C to USB-C cable. Avoid USB-A to USB-C cables. They can't transmit PD.
- Check the power profile. A proper PD charger will negotiate the right voltage (such as 9V, 15V, or 20V) for your monitor.
- Restart the monitor. After switching to PD power, the screen should turn on normally.