I have a light consisting of one super-bright white LED which plugs into the USB port of my PC. It was flickering and now does not illuminate.
The supply leads to the LED are delivering 5v from the USB port but my meter wouldn't show the sort of intermittency which might cause flicker.
On dismantling the light, I see the leads of the LED are the same length and are unmarked.
(1) In general, how can I test such an LED using my multimeter and/or battery? (If it helps, my multimeter has a socket marked E.B.C.E which I think can somehow test transistors.)
(2) If I apply something like 5 volts or perhaps 8 volts to just the LED in reverse to its normal polarity then will I cause the LED damage?