I have a very old but nice Viewsonic LCD monitor with a failed power supply (Delta ADP-60BF) that I can't find a schematic for. I believe I have found all the failed parts, but one of them is a surface mount zener that I can't determine the value of. But I do know what the output and test point values are. I'm guessing its an over-voltage protection that I may be able to take out of the circuit. Nonetheless, my question is: Would it be possible to simulate a zener with a variable power supply? There are a few others in the circuit that I have determined to be in the 10-18 Volt range. So that will be my upper limit.