Have you connect right ?. Rotate the HDMI body and the cable connection, and unplug it again. Rotate the HDMI body and cable connection. --When you use it you need to connect a USB cable to power it and use the switch button to switch the composite signal to 720P/1080P.
eBay
Game Console N64 to HDMI-compatible Converter Adapter Plug and Play for N64/SNES/NGC (PAL/NTSC) Adapter with 3.5mm Audio Output
Aliexpress UK
[Using Scaler Video Processing Technology] Multiply BNC signal to HD 1080P/ 720P@50/ 60Hz output. Various video formats (480i, 480p, 720p, 1080i) in SD can be upgraded to high-definition 1080P@50/60Hz output through Scaler UP technology.
eBay
For Nintend Gamecube NTSC SD2SP2 Adapter TF Card Reader Replacement + Swiss Boot Disc Mini DVD for Gamecube NTSC-U/NTSC-J/PAL
Aliexpress UK
[Using Scaler Video Processing Technology] Multiply BNC signal to HD 1080P/ 720P@50/ 60Hz output. Various video formats (480i, 480p, 720p, 1080i) in SD can be upgraded to high-definition 1080P@50/60Hz output through Scaler UP technology.
eBay
Bitfunx RGB/Component to HDMI-compatible Video Audio Adapter With USB Cable for Sony NTSC PAL PS2 Fat or PS2 Slim Game Console
Aliexpress UK
Converts analog composite input to HDMI 1080p (60HZ) output,displayed on 1080p (60HZ) HD TV/ TV/ Moniter. Input ports: 1xRCA (Yellow, White, Red), Output ports: 1xHDMI1.3 1080p (60HZ). NOT support 3D and 4K, NOT support HDMI Converts to AV.
eBay
Bitfunx Video and Audio VGA to Digital HDMI-compatible Adapter for SEGA Dreamcast Game Console NTSC And PAL
Aliexpress UK
THIS IS A HDMI ADAPTER AS SHOWN IN THE PICTURES FOR NTSC & PAL MODELS OF THE SNES, N64 & GAMECUBE CONSOLES IT IS A BRAND CABLE MADE BY BITFUNX THIS ADAPTER FITS IN THE BACK OF YOUR CONSOLE - YOU THEN HAVE TO USE A REGULAR (NOT SUPPLIED) HDMI CABLE TO CONNECT IT TO YOUR TV BRAND NEW AND IN THE UK READY TO SHIP THANKS FOR LOOKING
eBay
Bitfunx HDMI Adapter for Nintendo Wii NTSC PAL Retro Game Consoles HD Connector Plug And Play
Aliexpress UK
Converts analog composite input to HDMI 1080p (60HZ) output,displayed on 1080p (60HZ) HD TV/ TV/ Moniter. Input ports: 1xRCA (Yellow, White, Red), Output ports: 1xHDMI1.3 1080p (60HZ). NOT support 3D and 4K, NOT support HDMI Converts to AV.
eBay
Xeno Mod Direct-reading Chip For Gamecube NGC SD2SP2 PRO Adapter TF Card Reader for NTSC-J/NTSC/PAL CD Console Modification Part
Aliexpress UK
It digital transfer device using the most advanced all-digital way on TV and video format for processing, powerful functional and superior performance of the feature from many kinds of video signal formats (Including PAL, PAL60, NTSC3.58, NTSC4.43, SECAM) unified converted into PAL or NTSC standard signal output (as required by the user settings).
eBay
SD2SP2 Pro SD Card Adapter for Gamecube NGC and Swiss Boot Disc v0.6 and XENO Modchip for Gamecube NTSC-U/NTSC-J/PAL
Aliexpress UK
Support PAL, NTSC, SECAM standard TV formats input. Support PAL, NTSC standard TV format output. Composite input: PAL, NTSC, SECAM. 1x PAL NTSC Bi-direction mini converter. Composite output: PAL, NTSC.
eBay
SD2SP2 Adapter TF Card Reader Replacement+Swiss Boot Disc Mini DVD for Nintendo Gamecube NTSC-U/NTSC-J/PAL Game Accessories
Aliexpress UK