Electronics Forum: solder joints (Page 9 of 290)

Lumpy joints

Electronics Forum | Fri Dec 14 13:58:07 EST 2001 | slthomas

This is one I haven't seen before (not in this context, anyway). We have an assembly that we have the SMT done out of house on, because of the high volumes. The boards have two distinct characteristics with respect to the appearance of the solder jo

unsoldered joints

Electronics Forum | Tue Sep 22 06:07:02 EDT 1998 | jacqueline coia

need advice to point me in the correct direction for solution to the problem of unsoldered joints which look soldered under normal visual inspection, but when pull strength test is performed the leads are coming away from pad, no strong intermetallic

Open joints

Electronics Forum | Wed Oct 03 17:07:52 EDT 2001 | davef

We have had soldering problems with fine pitch QFP in the past [and probably will in the future]. Several questions leap to mind: * When you took your profile on the component pads, do you profile on the pads that did not solder well? * When you say

Lumpy joints

Electronics Forum | Mon Dec 17 11:20:12 EST 2001 | slthomas

Well, I was able to convince them we had a serious problem on the poorly reflowed boards without spending 2k on off- site analysis. Now all we have to do is sort out the ones that flowed well but had solder balls (looks like a damaged stencil prob

Open joints

Electronics Forum | Wed Oct 03 21:28:38 EDT 2001 | davef

A firm grasp on the sublime. Mike points-out a good reason to describe Claude's problem as "open connections" or "open solder connections"? [Ahhh geez, wut a spoil spurt]

Open joints

Electronics Forum | Wed Oct 03 17:08:32 EDT 2001 | davef

No comment or intent to appear critical on your particular situation, because you did the troubleshooting to determine the source of the problem, but �solder on the component lead, but not on the pad� is more often caused by a reflow profile that get

cracked joints

Electronics Forum | Fri Jul 12 22:15:56 EDT 2013 | ericrr

Sorry to build up your hopes. The latest thing to hit the air ways at work, I was accessed of fiddling with the oven settings, because there were reports of "cracked joints" there was no mention of where the cracks were, cracked at the pcb or cracke

Open joints

Electronics Forum | Wed Oct 03 09:56:51 EDT 2001 | Claude Tremblay

Hello everyone We have a QFP-308 (0.20" pitch)on a board and we have a lot of opens after reflow. We checked our profil by installing thermocouples on the pads of the component and everythings seems OK. We checked the coplanarity of the leads and it

Open joints

Electronics Forum | Wed Oct 03 12:04:55 EDT 2001 | slthomas

When we found this to be a problem with some QFP 100's (.020" pitch, and our first experience with fine pitch - 48 of them on a 2-up panel), we saw that the solder was running up the leads during reflow and staying there, leaving the fillets thin or

Re: unsoldered joints

Electronics Forum | Tue Sep 22 09:07:02 EDT 1998 | Steve Gregory

Hi Jacqueline! Do these joints that you're having problems with happen to be on fine pitch solder joints? Are the fillets staying attached to the foot and separating from the pads cleanly? If that is true, are there many vias concentrated aroun

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