For a full download of the board's firmware or deeper schematic access, professional forums like KenotronTV and Remont-AUD provide verified dumps and service manuals. Hisense MSD6486T Service Manual | PDF | Power Supply
A review of the schematic pins and traces reveals typical input/output mappings: tp.ms6486t.pb753 schematic
(Refer to Sheet 5 - LVDS/Vby1)