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Most adapters come with a micro-USB port for power input. You can only use external power if the HDMI to VGA adapter supports it.

You can fix this by connecting a USB cable to your PC or external power supply to provide enough power to the built-in active chip. Your HDMI to VGA may not work if the source device outputs low power through HDMI. Q: Why Is My HDMI to VGA Adapter Not Working? If you see Unknown device, right click on it and select Update Device. In Device Manager window, check if there is a section of Unknown device. Press Windows key + X, and select Device Manager. If it shows as an Unknown device, we can try to update the drivers. These adapters use a built-in chip to convert the digital HDMI output to an analog VGA signal, compatible with most old monitors, TVs, and projectors. We can check if the HDD enclosure shows as an Unknown device. You can connect an HDMI source device to a VGA monitor using an active HDMI to VGA adapter. They are ideal for connecting newer laptops and HDMI sources to a display with VGA inputs.These adapters are not bi-directional, so make sure to get a suitable adapter for your needs. They are ideal if you want to connect an old desktop PC with VGA outputs to a monitor, TV, or projector with HDMI inputs.On the other hand, HDMI to VGA adapters converts a digital HDMI input to an analog VGA output. VGA to HDMI adapters converts an analog VGA input to a digital HDMI output.

VGA to HDMI adapters are very different from HDMI to VGA adapters. FAQ Q: Is There a Difference Between VGA to HDMI and HDMI to VGA?