If THEC64 or THEC64 Mini is not working as expected, there are a number of things to try:

  1. Ensure that the power supply you are using is sufficient for THEC64 Mini. This needs to be 5V/1A for the items supplied in THEC64 Mini box. When attaching any additional USB devices, a 1.5A or 2A power supply is recommended, as other USB devices may have different power requirements. If THEC64 Mini is under-powered then it is likely to not operate correctly or behave erratically
  2. Check that you are using the latest firmware for THEC64 or THEC64 Mini.
  3. Test THEC64 or THEC64 Mini by ensuring that it is connected directly to your TV or Monitor using the provided HDMI lead and is not using any other cables or devices in-between
  4. If you are using a USB hub on THEC64 Mini, we recommend a powered hub. Also see point 1
  5. If there is a time delay between performing an action on the joystick and seeing it on the screen, your TV is likely to be applying image processing which can cause a noticeable delay. Switch off all image processing options by consulting your TV manual. Some TVs include a special ‘Game Mode’ that you can also try
  6. If THEC64 Joystick is not working correctly, try connecting it to a desktop computer and testing it there. THEC64 Joystick works on Windows, Mac and Linux computers
  7. You can test the USB ports by connecting a USB gamepad/controller, USB keyboard or USB memory stick to each port and test them in turn
  8. If your USB memory stick isn’t detected, ensure that the USB stick is formatted to FAT32 with MBR (Master Boot Record). If formatting using Windows 10, ensure you perform a full format rather than enable ‘quick format’.
  9. For loading a D64 file from a USB memory stick when accessing BASIC on THEC64 Mini, the file must be named THEC64-drive8.d64. If you are naming the file using Windows, ensure you can see file extensions otherwise your file might be accidentally named THEC64-drive8.d64.d64 instead (for example). See Loading Programs in C64 BASIC for more information
  10. If your TV is playing sound from THEC64 Mini but is not displaying the picture, then it is likely to be unable to display the output signal. The North American model displays at 60Hz, whilst the European model displays at 50Hz. Try a different TV or monitor.
  11. You can also try a Factory reset, which deletes your chosen Language, Display and (on THEC64 Mini) the USB Keyboard settings, along with any stored saved game positions. A factory reset doesn’t remove any saves stored on a USB memory stick. This reset effectively restores THEC64 or THEC64 Mini to its initial factory condition (excluding the current firmware, which remains unaffected).

Also see the general Frequently Asked Questions page for additional information. THEC64 users can also download the User Manual, which includes a Troubleshooting section in Appendix A.