These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. SAMSUNG C27G55TQWN MONITOR BUTTON BOARD BN96-42664B / BN41-02578B. Please verify that your board part number is the same as BN96-42664B / BN41-02578B. 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)