A motor capacitor is only investigated in designs that include one. A buzzing sound with failure to start can also be caused by mechanical blockage, power supply, or the motor itself, so it does not justify replacing it outright.
Do not confuse components that look alike
The starting or run capacitor belongs to a specific design. The power input filter and the capacitors on a circuit board or electronic drive serve other functions. A dual assembly is not the same as a single part with extra connections.
First identify the motor type. In a dual-tub unit that will not spin, the fact that one section works does not establish the electrical condition of the other.
What a valid check requires
The technician must have the schematic, the specification, and a procedure for safe isolation and discharge. Unplugging does not prove that a capacitor has lost all its charge. Do not short its terminals or improvise a discharge.
The measurement is interpreted according to the component limits and the prescribed method. Appearance alone does not rule out a fault, and a single reading does not resolve a possible jam accompanied by buzzing.
How to select the replacement part
Capacitance, service type, required rated voltage, connections, and mounting of the compatible part number must be matched. Do not choose an approximate value or increase the rating in an attempt to improve starting.
Once replaced, the full circuit must be checked and the enclosure restored before validation. Live electrical tests are not part of a general household check.
Record the full part number of the assembly and its application to the model: a partial marking does not necessarily identify an equivalent capacitor.