Francis J Mountain City , TX January 29, 2018 Appliance: Samsung Range NE595R0ABSR/AA-0000 Samsung Range Ne595r0absr/Aa-0000 / : Keypad numeral 5 and kitchen timer were inoperative. How to replace Assy Pcb Main;Led,Oas-Ag. At first look, I believed the keypad membrane was defective. Ordered a new one and installed it. The problem persisted. Next, component was the PCB (Main control board). Ordered a new one, installed it, and the problem is resolved. Very easy to install. 11 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes