Why doesn't my SCART to HDMI cable work?

The SCART to HDMI cable may not work due to various reasons. It could be a compatibility issue between the SCART output and HDMI input, as these are different video signal formats. Additionally, the cable itself might be faulty or of poor quality. It is also possible that the settings on the connected devices need to be adjusted to enable the HDMI input. Without further information, it is difficult to pinpoint the exact reason. It is recommended to consult the user manual or seek technical support for troubleshooting assistance.

The reason a simple cable won't work is the ports use different signals. SCART uses the older analogue signal while HDMI uses digital. A cable can't change the signals. To convert the signals you need special hardware and power which a cable lacks.