Samsung UN55D6420UFXZA Power Supply BN44-00428A
Power Supply/ LED Board

Part Number
BN44-00428A/BN44-00428B(Remove your connector from bn44-00428B install to bn44-00428A)

Board Number(s)
PD55B2_BSM

Part Number can be found on the board.
TV Model
Samsung 
UN55D6400UFXZA
UN55D6420UFXZA UN55D6450UFXZA

UN55D6500VFXZA UN55D6900WFXZA