By default, the kernel activates a console blanking timeout of 600 seconds. After reaching the timeout, the hardware terminal turns black. In case of a kernel OOPS, important debugging information may not be visible/accessible.
To disable console blanking, add consoleblank=0 to the UCR variable grub/append and reboot your system:
ucr set grub/append="$(ucr get grub/append) consoleblank=0"