They should have at least sacrifice one capacitor, testing its polarities before soldering the whole roll of capacitors on the motherboards... Because if one is wrong polarity meaning the whole roll ...

The four basic capacitor types. The key parameters involved in selecting the right capacitor for automotive designs. Advantages and limitations of electrolytic and electrostatic capacitors. Choosing a ...

Targeting high-reliability ac circuits where polarity may reverse, the HFC series of surface-mount, ceramic capacitors represent non-polarized devices that are to be stable across a wide frequency ...