These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. SAMSUNG U32R590CWN MONITOR CONTROL BOARD 55.31M05.C03 / 31M05 C01 CTRL. Please verify that your board part number is the same as 55.31M05.C03 / 31M05 C01 CTRL. 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)