Datavideo TBC-1000 has no color bars?
 

Datavideo tbc 1000 does not generate color bars. Is that normal or it needs to be repaired? TBC 100 does.

The TBC-1000 (and TBC-100) -- maybe all the DataVideo TBCs -- do not generate color bars.
It does not need to be repaired, no.

And honestly, color bars are not really needed. You can use many test patterns on your own, for the TBC input, if needed.

I can see a grainy color bar when turned on for a second and after that it disappears.
Thank you for advice.