A failed supply shows up as a set that is completely dead, clicks and restarts, or has sound but no picture because the LED rail has dropped out.
Listings are matched by model and by the printed board number. Compare the part number on your original supply, and where listed the interchange number, against the numbers in the title. Sockets and connector layout must match as well as the number, so check the photograph of the connector side before you commit.
Most supplies here are used pulls or new old stock from US TV tear-downs, tested for the rails listed in the specifications table. Ships from US stock with tracking.
