It may light up less than fully, or may fail to light up at all if the
partial short is a more conductive one
(dropping less voltage than it takes to make the LED glow visibly at all
using the amount of current being used).
Undamaged InGaN and GaN LEDs normally glow easily visibly at .2
milliamp, maybe except for violet and UV ones. At .5 mA, they usually
glow with a brightness typical of LED indicator lamps.
In my experience so far, static-damaged ones don't glow at all at .5 mA,
and I expect static-damaged ones to consistently not glow and to show
unusually low voltage drop less than 2 volts (usually some fraction of a
volt) at .2 mA.
- Don Klipstein (
[email protected])