First, you as the purchaser of the part is accepting the role of the technician in properly diagnosing and installing the part. We do not know your qualifications as such.
Secondly, each part we sell came from a TV that had a broken or defective LCD or Plasma panel. Any questionable boards are disposed of. The item "SAMSUNG BN44-00274A POWER SUPPLY BOARD FOR PN50B400PSDXZA AND OTHER MODELS" is in sale since Sunday, February 28, 2016. This item is in the category "Consumer Electronics\TV, Video & Home Audio\TV, Video & Audio Parts\TV Boards, Parts & Components". The seller is "mortstv2010" and is located in Levittown, Pennsylvania.This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to New Zealand, PH, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY.