When I encounter the LED BOARDs that had the built-in DC VOLTAGE regulator always seem to create enough RFI to blank my HD TV signals, give havoc to my Ham Radio Operations in the VHF regions, and mess with my WX RADIO reception. The HDTV being picked up using the OTA BATWING antenna from the local towns was most often blanked out by using thee LED boards.
Hopefully you are not bothered by any of this... Maybe the quality of the LED Boards from todays markets are better than those that were available in the 2008 era.
I am currently using the LED boards purchased from ebay-china that only have a DC VOLTAGE range of 12vdc-14Vdc.. They were so cheap I ordered a whole bunch of spares. To date I have only replaced one LED boards out of eight installed in 2008 time frame...

These boards were available for quantity ten each for about $50.
I gave away my high dollar boards that had built-in DC VOLTAGE Regulators.
Roy ken