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reversed polarity

Library

A dead source, an open connection, an incorrect resistor value, reversed polarity and a damaged LED are hypotheses. +1

обратная полярность

перепутанная полярность

Подключение компонента с перепутанными положительным и отрицательным выводами.

The LED Is Dark, but the Supply Is Live

Original evidence-led technical case for Explaining Why an LED Circuit Does Not Work.