my kefeya g2 screen extender won't power on at all, what should i do?

Diagnosis

The KEFEYA G2 screen extender is a high-draw peripheral that relies on a specific voltage threshold to trigger its internal boot sequence. When the device refuses to power on, it is almost always due to "Under-Voltage Lockout" (UVLO). This occurs when the laptop's USB-C port cannot provide the necessary 5V/2A or 9V/2A current required to wake the display panels from a deep sleep state. If the device was disconnected abruptly or the laptop entered a hibernation mode, the G2's internal capacitors may hold a residual charge that prevents a clean reboot. Another common cause is the "Handshake Failure" between the USB-C PD (Power Delivery) protocol and the laptop. If you are using a standard USB-C cable that is not rated for high-wattage power delivery (non-PD cables), the screen will remain black because it isn't receiving the signal to activate the backlight. You can confirm this by checking the LED indicator on the side of the G2 frame; if it is completely dark or blinking a dim amber, the unit is starved for power. If the LED is solid blue but the screen is black, the issue is signal-related rather than power-related.

How to Fix It

To resolve a complete power failure on the KEFEYA G2, follow this specific sequence to force a hard reset and ensure maximum power delivery:

1. Disconnect all cables from the G2 extender, including the USB-C power and the HDMI/USB-C signal cables.
2. Locate the power button on the right-hand bezel. Press and hold this button firmly for exactly 15 seconds. This drains the residual electricity from the internal capacitors and resets the onboard controller.
3. Connect the G2 to your laptop using the original USB-C to USB-C cable provided in the box. Do not use a third-party phone charging cable, as these often lack the necessary data pins and power wattage.
4. Plug the G2 into the laptop's "Thunderbolt" or "USB-C PD" port (usually marked with a small lightning bolt or battery icon).
5. If the screen remains off, connect a separate 5V/2A external power adapter (such as a standard smartphone wall brick) directly into the secondary power port on the G2. This bypasses the laptop's power limitations.
6. Once the external power is connected, press the power button once firmly. The LED should turn solid blue and the KEFEYA splash screen should appear within 3-5 seconds.

If That Didn't Work

• Test with a Different Power Source: Use a high-wattage GaN charger (65W or higher) connected directly to the G2. If the device powers on with a wall outlet but not the laptop, your laptop's USB ports are likely limiting current to protect the motherboard, and you will need to use external power permanently.
• Cable Swap and Inspection: Inspect the USB-C pins for any debris or bending. Replace the cable with a certified USB 3.1 Gen 2 cable. Many "charging cables" only support USB 2.0 speeds and low voltage, which will fail to trigger the G2's display logic.
• Driver Refresh: On Windows, open Device Manager and look for "Generic PnP Monitor" with a yellow warning triangle. Right-click and select "Uninstall device," then unplug the G2 and plug it back in to force Windows to re-enumerate the hardware ID.
• Port Switching: If your laptop has multiple USB-C ports, try the one closest to the power input. On many laptops, only one specific port supports full Power Delivery (PD) output to peripherals.

Heads Up

• Avoid Daisy-Chaining: Never plug the KEFEYA G2 into a non-powered USB hub. The voltage drop across a hub is too significant, which can cause the screen to flicker or fail to boot entirely.
• Heat Management: If the G2 becomes excessively hot to the touch, it may trigger a thermal shutdown. Ensure the back of the extender has at least 1 inch of clearance for airflow.
• Cable Care: The USB-C ports on the G2 are soldered directly to the mainboard. Avoid plugging and unplugging the cable at an angle, as this can loosen the solder joints and cause intermittent power loss.
• Firmware State: Always shut down the extender using the power button before putting your laptop into "Sleep" or "Hibernate" mode to prevent the controller from locking up.