Electronics Forum | Mon Mar 22 07:40:01 EDT 2010 | emanuel
Are you absolutely sure the problem is with the humidity? We had a problem with 3528 size leds, damaged by the pick and place nozzle because a 0.2mm mistake in the height measurement. Also, we found that several suppliers are using fake desiccant ba
Electronics Forum | Thu Mar 18 11:07:45 EDT 2010 | mun4o
hi, lately I have problem with smd leds.After reflow 2-4% of leds are broken.I think , that reason is bad storage of components, because in our stock the tape with leds have not Moisture Barrier Bags.My question is ,how you storage components, which
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 | Thu Mar 18 12:46:20 EDT 2010 | deanm
The standard J-STD-033B.1 addresses how to store moisture sensitive components. A dry box is a good, convenient way to store MSDs, but there are other methods to consider which are outlined in the standard. Are you sure that the problems are caused
Electronics Forum | Fri Mar 19 03:50:37 EDT 2010 | grahamcooper22
Some things you have to be sure of... Can you guarantee the LEDS are DRY when you receive them ? They may be packed in dry bags but when was this done and has the LED distributor had them open at his site ? Using vacuum sealed dry packs is a good way
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 | Wed Oct 13 08:37:49 EDT 2010 | denisp
we have a static problem with 0603 led when removing the plastic retainer from the tape and reel. same problem with the feeder causing reject and bad placement. is there someone having the same problem? and how to fix it. thank you
Electronics Forum | Thu Dec 14 05:07:55 EST 2017 | tsvetan
picture of the problem would help people to speculate what you do wrong
Electronics Forum | Wed Sep 26 15:16:29 EDT 2012 | hegemon
Pads look WAY oversize for the LED leads. Perhaps the solder won't go to the LED because it is spreading across the pads on the PCB instead. The board pad vs. component lead size equation I see would make me expect some starvation of the joints at t
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