These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. DELL C5519Q MONITOR LED ASSEMBLY W/LED (LEFT) AP01LAL-K3A50-5-8A0-0023 / V-6840-B46-10. Please verify that your board part number is the same as AP01LAL-K3A50-5-8A0-0023 / V-6840-B46-10. 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)