I am looking for a Samsung 50" Tv Lamp, the model number is HLT5087SX/XAA. The Serial Number is AHEJ3CMP400199M, tried Ebay and Amazon but no luck.

 

Do you mean backlight???

A five second search turned this up
http://www.tvserviceparts.com/HLT5087SXXAA.html

Give them a call they probably have the backlight.

Also turned this up:

http://blog.consumerbell.com/2012/0...ounces-class-action-settlement-for-consumers/

You might get some of your money back.