Electronics Forum | Sat Dec 28 02:58:12 EST 2002 | emeto
If the problem is in the big thermal pad.The surface strains in that pad are different then the others and through the reflow period there is an affinity between them(only if they are too close). I recommend you to reduce the theramal pad. Make smal
Electronics Forum | Wed May 26 05:05:04 EDT 2004 | curious
hi, we have a batch-rework for a axial 2-lead LED component. we are thinking of bending both ends of the axial-leads into a L-shape at 90degree angle, and solder the flat-end of the L-shape flatly to the PCB's SMT pad. hope the experienced guys/exp
Electronics Forum | Wed May 26 06:54:07 EDT 2004 | davef
Q1) if this is an acceptable component-lead modification? A1) Yes, it's acceptable Q2) and does this mod meet any existing IPC specs?(did a internet search but no result) Q2) IPC repair guidelines are: 7711A/7721A - Rework and Repair Guide For ot
Electronics Forum | Thu May 27 23:16:49 EDT 2004 | curious
thank you for the advice.
Electronics Forum | Mon Dec 07 14:55:41 EST 2015 | clydestrum
So I have an issue coming up that I'm not too sure how to handle. A board was designed with the wrong footprint for a 3-lead transistor in which the single-lead side has a much larger (think thermal pad for qfn) copper land than what is meant for the
Electronics Forum | Thu Oct 31 09:34:38 EST 2002 | russ
We do this all of the time, This is what we do but I would be interested in other methods. 1. Remove component with BGA type rework station 2. Wick off lead pads only, verify/create even solder surface on the thermal pad on the board 3. Apply no-cle
Electronics Forum | Fri Jun 16 11:28:53 EDT 2000 | Boca
Solder 'follows' heat. 1. Preheating is a great idea, use a baking oven to get the whole assembly up to temperature, use the preheaters in your wave solder machine (without wave) to preheat the assemblies ... 2. Or use the biggest soldering iron
Electronics Forum | Mon Dec 16 10:31:21 EST 2002 | davef
Grant, On those 'dry pads', where does the solder paste end-up after soldering? On: * Pads * Component leads * Someplace else [Where?]
Electronics Forum | Mon Dec 16 21:51:28 EST 2002 | grantp
Hi, It's on the pads. They look ok, but when you check the lead comes away from the solder. Regards, Grant Blackmagic Design
Electronics Forum | Tue Aug 31 17:36:36 EDT 2004 | davef
NO-LEAD COMPONENTS WITH LEAD SOLDER ISSUE: We agree with Russ. We've dicussed this several times on SMTnet. For instance, look here http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=25394 LEAD COMPONENTS WITH NO-LEAD SOLDER ISSUE: We disa
