These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. LG 34WK500-P MONITOR LED STRIP 34UM59 REV 0.3(l), 34UM59 REV 0.3®. Please verify that your board part number is the same as 34UM59 REV 0.3(l), 34UM59 REV 0.3®. The part number is the first number left of the /, or the sole number listed. Most often written in title as (part number / board number)