I have recently gotten a hold of several Samsung TVs with bad backlights. Unlike LG TVs which shut down the backlight if failures are detected, Samsungs will continue to run leading to failure of almost every LED. Damage to the power supply could also occur. For most Samsung TVs, disconnecting the cable from the main board to the power supply board should light up the backlights. Here is a list of models and the corresponding LED strip part numbers I have encountered .
UN40EH5300FXZC, UN40H5203AFXZC – both use a 3 strip setup with 2 angled strips and 1 straight strip. Part numbers LM41-00001V/ LM41-00001W or D3GE-400SMA-R2/ D3GE-400SMB-R2
UN46H5203AFXZA, UN46EH5300FXZC – LM41-00001X / LM41-00001Y or D3GE-460SMB-R1 / D3GE-460SMA-R2 or BN96-28769A / BN96-28768A I have encountered damage to power supply BN44-00771A (traced to a bad diode D9801C) on one TV.
UN50EH5300FXZC – D3GE-500SMA-R3 / D3GE-500SMB-R2