These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. ACER KA242Y MONITOR MAINBOARD 21201-02431 / 60104-09113. Please verify that your board part number is the same as 21201-02431 / 60104-09113. 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)