Electronics Forum | Thu Jan 06 06:09:43 EST 2005 | calibration
does anyone know of a LED test solution for multiple LEDs' on a PCB that can be used in an incircuit or a functional fixture
Electronics Forum | Thu Jan 06 10:56:32 EST 2005 | Rob
If the Leds are not in close proximity then LDR's can be used connected to a node on the ICT/wired into a micro for a simpler board - you can then test for luminous intensity as well as absence. Else you could use a cheap CCD camera with some simple
Electronics Forum | Fri Mar 19 03:13:35 EDT 2010 | mun4o
Hi, First check what the Moisture Sensitivity > Level of the LEDS is....you may need to ask the > LED manufacturer. Once you've established it is > moisture sensitive then follow latest version of > IPC JEDEC 33 spec. for storage of them and dryi
Electronics Forum | Mon Mar 22 10:24:14 EDT 2010 | mun4o
Hi , I think that our problem is humidity, because when I use leds from new tape ( pack in MBB ) no any defects.After that, we put opened tape in our store.After 2-3 weeks I use the same tape with leds, and we have 2-3% defective leds.I make this tes
Electronics Forum | Tue Mar 23 03:42:51 EDT 2010 | grahamcooper22
Hi, It is very important to follow IPC JEDEC 33 specification for storage and handing of all MSDs. In many instances defects caused by excess moisture in packages is not immediately evident (pcbs may pass final test) but when pcb has been in the fiel
Electronics Forum | Tue Mar 12 07:46:26 EDT 2013 | ngineer
bobpan, It only happens with this program. CC ver 7.54, IVC V 3.05 If i leave CC out of it, and edit the sequence using the HHT, it sticks. but if i download from the assembler to CC, it's messed up. if i then fix it in CC, the minute i save
Electronics Forum | Thu Oct 21 13:21:16 EDT 2004 | JAArient
If you are measuring the voltage for a presence test that is fine. But you can not tell you the color of the led and have confidence that the right part is installed. Led forward voltages vary a lot between parts and between mfgs also. http://www.
Electronics Forum | Thu Aug 03 20:51:27 EDT 2017 | OrHorti
I did a test where the leds were put into a 95% humidity at 60 degC environment for an hour, and after that almost all leds would stick into the carrier tape. So, moisture might certainly play a major role in the stickiness of the leds. We placed al
Electronics Forum | Wed Apr 16 01:40:17 EDT 2003 | praveen
Hi , We are using water wash solder paste to solder the SMT LED's manufactured by Chicago Miniature lamp (CMD93-21 & 22)and Kingbright. Achieving the solder fillet , wetting has no issue but we observe high fallout at the functional testing. If we do
Electronics Forum | Mon Sep 29 14:47:07 EDT 2008 | ikonify
Have seen similar problem before with regards the MSD being the cause. But also seen similar defects being found at functional test as the in-circuit test was injecting to much current during test. The devices were walking wounded afterwards. The in
