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File:LedFailure1.png

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Summary

Description
English: If a LED goes open circuit, then, if the voltage is high enough, the current that should have gone through that LED could theoretically find an alternative route through other LEDs.
  • For example, if LED1 (L1) goes open circuit, then current could still flow from terminal 3 to terminal 2 through L2 and L3. Other possible routes are through L4/L5, L6/L7 and L8/L9.
  • However, if LED1 goes short circuit, then, any time just one of its terminals is connected to the supply, then both it's terminals are connected to that supply:
    • If terminals 2 and 3 have opposite polarities, then R2 and R3 will act as a potential divider, halving the voltage at the junction of these resistors. This reduced voltage may prevent other LEDs in the array lighting when they should.
    • If terminal 2 or terminal 3 is negative, then both the red and brown tracks will be negative at the same time. Therefore, some LEDs connected to these tracks could light up unintentionally when terminals 1, 4, 5 or 6 are positive.
    • Similarly, if terminal 2 or terminal 3 is positive, then both the red and brown tracks will be positive at the same time. Therefore, some LEDs connected to these tracks could light up unintentionally when terminals 1, 4, 5 or 6 are negative.
Date
Source Own work
Author Ron Binstead

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Captions

Failure of 1 LED can cause current to be re-routed through other LEDS.

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22 May 2023

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