Knowledge Base for Cable Matters Connectivity Products

Cable Matters 201028 USB-C to 4K HDMI Adapter with Power Delivery

Article ID: 72
Last updated: 09 Sep, 2019

System requirement

Not all USB-C ports support all features of USB-C. Some computers and smartphones only support data over USB-C for external storage such as flash drives while some devices support video and charging over USB-C. Check the below article about the USB-C port capability. If you are not sure, please consult the manufacturer for this information.

Symptom: The adapter is not functioning properly on a Windows computer with Thunderbolt 3. Symptoms include no video and flickering video.

Solution: Update BIOS, Thunderbolt 3 firmware, Thunderbolt 3 driver, and Intel Graphics Driver from the manufacturer website. For more details, refer to articles below:

BIOS, Firmware and Driver Updates

Update Intel Graphics Driver

Symptom: The adapter does not fast charge certain smartphones

Many smartphones currently do not support the USB Power Delivery protocol, which is used by this adapter. Instead those smartphones support Qualcomm Quick Charge or other proprietary charging protocols. In this case, the adapter will charge the phone at standard speeds.

This adapter will fast charge smartphones such as the Google Pixel which is equipped with USB Power Delivery.

Symptom: The adapter is not recognized / adapter does not charge the smartphone / computer

Unplug all cables, restart the computer, and then reconnect everything.

Symptom: Computer is not charging or charges at a reduced speed

This adapter can pass up to 60 watts of power to the computer. Some computers require more than 60 watts and power delivery may be disabled through USB-C or charge at a reduced speed when 60 watts of power is provided.

Use the original AC power adapter and USB-C cable that came with your computer when charging with this adapter. Third party chargers may not be fully compliant with the USB specification. They may not charge properly or could potentially damage the adapter or your computer.

DO NOT unplug the power to the adapter while in use. This will interrupt the signal and may cause connection issues.

Symptom: HDMI does not work at full 4K 60Hz resolution

The adapter supports HDMI 2.0 resolution up to 4K at 60Hz. You will need a 4K 60Hz rated computer, HDMI cable, and display to take advantage of HDMI 2.0 bandwidth.

Some smartphones and laptops such as the LG G5 (1080p) and 12" MacBook (4K@30hz) do not support 4K at 60 Hz video out. Some displays have multiple HDMI inputs and not all of them are HDMI 2.0 capable so test each HDMI input.

Symptom: Adapter stops outputting full 4K 60Hz resolution after upgrading to macOS 10.14 Mojave. Refresh rate is capped at 30Hz.

Please refer to the article below to enable 60Hz in macOS 10.14 Mojave.

Symptom: Audio is not transmitted to monitor through HDMI

Some monitors do not have built-in speakers. Therefore, audio must be transmitted separately. If audio is supported, please follow the steps below to select the correct playback device:


1) Open the 'Sound' menu by searching or right clicking the sound icon on the taskbar

2) In the Playback Tab, select the display with HDMI

3) Click Set Default

4) Click OK to save the settings


1) Open the Apple Menu and go to System Preferences

2) Click the Sound icon

3) Click the Output tab

4) Select the display with HDMI

For more information about our USB-C products including drivers and user manuals, please visit the USB-C page on our website

Article ID: 72
Last updated: 09 Sep, 2019
Revision: 9