Thank Misalf and curaga for yours advices.
Even if I spent some day before, to search about splash screen for Tiny Core, I didn't found the wiki:boot_splah page
curaga why have you abandoned the fbv to view an image at boot? It's the fliking the cause?
It is an equivalent soft for tc 6.x version (just to view an image like the fbv you have made for 2.x or 1.x version)?
How did you run the fbv at boot?
You say
then in the start of tc-config start a framebuffer image viewer, and in the end kill it
what is tc-config ? How to start framebuffer at boot?