LG SVC 6871VSMS28B Digital Board. From reading this board is a replacement part for these two LG units 52SX4D-UB and 62X4D-UB.
I opened the factory multi count box this board came in to inspect the items condition. Box is not included, just the board and its original factory bubble wrapping. These are new boards from an LG supplier sent to a television repair shop that recently closed down due to the owners passing. See photos for further condition details.