The Diode is an OEM part for Samsung microwaves. It is a critical component that allows the microwave to produce the high voltage necessary for heating food. The diode converts alternating current (AC) to direct current (DC), which is essential for the microwave's magnetron to generate the microwave energy used in cooking. Causes of a bad diode can include electrical surges, wear and tear from repeated use, or physical damage due to mishandling. Over time, these factors can cause the diode to fail, preventing the microwave from heating properly. Symptoms of a bad diode include: Microwave not heating food Burning smell or smoke Unusual noises during operation Microwave shutting down abruptly This OEM Samsung part is also compatible with select Kenmore microwave models.This part fixes the following symptomsNo heatDE91-70063D (AP4236698) replaces DE59-00002A, DE91-70063B, 0402-001554, 2084375, DE59-40001A, DE91-70063A, DE91-70063E, PS4235633.