Timeline for Failure of LEDs in the wet -- what's going on at the semiconductor level?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 18, 2018 at 13:23 | answer | added | Cristobol Polychronopolis | timeline score: 3 | |
| Nov 16, 2018 at 9:21 | answer | added | david | timeline score: -1 | |
| Nov 8, 2018 at 21:26 | comment | added | Chris H | @WhatRoughBeast the UV one was on a little MCPCB so I connected to that (I have now desoldered it with the aid of a hotplate). The red is still on its board (and not an easy board to reverse engineer due to unlabelled surface mount components and black lacquer over all the traces). I'll desolder it at some point, if nothing else to try replacing it | |
| Nov 8, 2018 at 16:14 | comment | added | Chris H | @Uwe yes, but what's happened inside, once the water has (presumably) been driven off? If it was wet and acting as a short I could understand it, but why flickering/fluctuating resistance? | |
| Nov 8, 2018 at 15:08 | comment | added | Uwe | LED cases are not hermetically sealed water tight. | |
| Nov 8, 2018 at 12:23 | comment | added | WhatRoughBeast | Are all of your tests made with connections soldered directly to the LED? | |
| Nov 8, 2018 at 12:00 | history | tweeted | twitter.com/StackElectronix/status/1060502202614210560 | ||
| Nov 8, 2018 at 11:54 | comment | added | Chris H | @isdi I've had the UV one under a microscope with noting visible on the outside before or after desoldering it. I may do the same on the red one | |
| Nov 8, 2018 at 11:24 | comment | added | user201365 | Might be dendritic growth due to electro-migration on the PCB/LED housing. Once those form a water wash won't get rid of them. | |
| Nov 8, 2018 at 10:39 | history | asked | Chris H | CC BY-SA 4.0 |