weird. That's the stage:
- It works: Burn with Balena, eject (not modifying config.txt) and plug/connect the Pi on a Samsung TV 4K. Now I wait 5-10 min. to prepare partitions, power off and connect again the Pi on the TV 24" (resolution is 1080p by default). Everything is fine.
- It doesn't work: Burn with Balena, eject (not modifying config.txt) and connect on a Samsung 24" (model UE24H4003AW) and I get infinite loop.
I let this comment for future reference or maybe can help someone.