Why does my screen go out but I still have sound?
Just bought a 65" rca 4k tv model# rtu6549 and the screen occasionally goes black and I still have sound what could that be?
Repair guides and support information for televisions manufactured by RCA.
@cm20228 could be a bad power board/LED backlight driver or a bad mainboard as well as a bad T-con board. You will have to go ahead and take a look at those. Of course, there is always a possibility of a bad firmware.
Since you just bought this set, I'd contact the vendor and have it replaced/repaired under warranty. Do not try any self repair until you checked out what kind of guarantee you have on this set.