These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. ACER SB220Q MONITOR MAINBOARD (NOT WORKING HDMI) R3522-4132-0150 / R0171-2271-0182. Please verify that your board part number is the same as R3522-4132-0150 / R0171-2271-0182. 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)