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© 2018 by EON


The GCHD Mk-II is the second iteration of EON’s flagship product, the GCHD. Mk-II represents the full realization for GameCube visual perfection and audio superiority, all packaged in a simple plug-and-play design suited to get the best out of your GameCube.

Designed in collaboration with Citrus3000psi, Mk-II bolsters the ability to provide component video via a Wii analog port, digital optical audio via MiniTOSLINK, as well as standard HDMI out for both audio and video. Mk-II also comes equipped with custom tuned firmware out of the box. 

Alongside these new features, Mk-II allows for multiple new video out formats, including RGB, Ypbpr, and direct YUV modes to support any and all setups.

The GCHD Mk-II is available now on Amazon and from our approved retailers. If you have any questions about Mk-II, please see our Advanced Operations Manual below, or feel free to contact us at

Advanced Operations Manual


The GCHD Mk-II is only compatible with GameCube's with the model number DOL-001 and is only usable by accessing both the Digital AV out as well as the Analog AV out. The GCHD Mk-II is not compatible with the Panasonic Q.

Please note, while the Mk-II is compatible with the vast majority of HDTV's and displays certain splitters and recievers may introduce signal problems. Please refer to our approved products list when considering products like these.


The GCHD Mk-II supports the following inputs:

- Standard HDMI

- Wii Component

- Wii Scart

- 3.5mm Auxiliary 

- Mini Toslink

(See Approved products list)


The GCHD Mk-II is pre-programmed with a custom branch of the GCVideo firmware number 2.4b. 

The Mk-II firmware can be updated via an SPI flasher, however we do not encourage users to update themselves. If you are interested in updated the firmware for whatever reason please contact us directly via our contact form.

IR Menu 

In order to access the Mk-II IR menu press the button next to the component port on the Mk-II and then begin the process of syncing a universal remote to your device via the on screen menu.

Typically any IR remote will work, however if you are encountering problems syncing, try setting your remote to tv/dvd mode, utilizing a Wii U Gamepad in TV mode, or check out approved product list to find our recommended compatible remote.

Video Modes and Settings

480i vs. 480p

The GCHD Mk-II is able to display video native 480p progressive scan in compatible game. For non progressive scan compatible titles a linedoubled 480i picture mode is available which utilizes bob-deinterlacing. 


When operating the device using HDMI, a standard HDMI cable is all that is necessary.


When running video via Wii Component, or Wii SCART, more video options become available.

Inside the IR Menu, under "Other Settings" and then "Analog Out" users can switch between RGB, RGsB, yuv, and dyuv. Each of these settings will be contingent upon your display, or scaler settings for compatibility.


Please note that the Mk-II  does support dual video when utilizing both the Wii Component/SCART port as well as HDMI


My image is split when using component on my CRT

If you image is splitting in a way like the images below, simply turn off the line doubler in the IR menu.

My image is very pixelated when using HDMI

If your image is coming through over pixelated when using progressive scan mode over HDMI or otherwise it is likely an issue with "Enhanced DVI Mode". For clarification, "Enhanced DVI Mode" is a mode that uses interpolated digital video and audio via the Digital AV connector. While most displays can utilize this signal without issues, some displays are not compatible with this type of signal resulting in an overpixelated image (see images below). 

If you are experiencing this simply turn off "Enhanced DVI Mode" to remedy the picture, however this will remove the audio signal via HDMI. Instead you can pull audio from the 3.5mm jack or by utilizing the red and white auxiliary cables via the wii component port.  

My image is displaying in the wrong colors when using my receiver

If your GCHD Mk-II is plugged into a receiver before reaching your TV, and certain display modes like 480p are displaying with incorrect colors(see images below), there is likely an issue with a mode setting on your receiver.

To remedy be sure to disable any "Video Conversion Option" that your receiver is likely using.

Images courtesy of @snesplay and @Valad_Amoleo