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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I couldn't figure out what was wrong with my plasma speaker so I used my oscilloscope and traced all the traces. It turns out that solder stopped conducting in a certain spot. I took a macro photo and I saw no hairline cracks or anything, yet it was 8 million ohms. After I remelted it it was fine.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I learned a trick from Kipkay, he uses excess component leads, instead of making that huge solder trail.
Registered Member #3271
Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159
From the residue around the board and the way the traces were made I would guess you had two islands of solder separated by a very thin layer of rosin? If there was a small contact between the two initially it could have heated and the flux would have separated the two blobs while still looking unchanged at the surface. Just a guess... or were these made over a continuous conducting trace or by blobbing each round copper button? If it was a hairline crack small enough that it could not be seen it would have been interesting to read the resistance while applying a bending force to the board and see if the contact could be reestablished that way.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Blobbing. But I saw no separation at all, not even a hairline one. Plus if there were a flux film the solder wouldn't have bunched up. If you've ever shaken a a bottle of oil an water you'll see that the h2o film makes oil bubbles.
And excess leads would have not handled the current.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
How much current are your pushing
don't you just hate it on the first light you flip the switch... and nothing
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
keep in mind a flux layer can prevent contact with the probes. Now I wipe everything down with isopropyl alcohol to clean it up.
EDIT: It looks like you did it section by section, after the previous section solidified. Its best to keep everything around it molten, if your iron can handle it. Then is forms a neat bead of solder down the board.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Thats a perfboard with wires under the solder. Pick apart the area to eight of the rightmost arrow and you may find two distinct solder areas. Are the leads from those parts of a different solderability? Such problems were common when a broken trace was soldered over to get continuity back instead of installing a jumper wire between points. On your board, the soldered over section is acting as the mechanical retainer for the parts on the other side of the board. You cant turn a perf board into a printed circuit board.
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I'm dumbfounded
