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Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Yeah, I've had a similar problem.
One thing which can happen in high frequency high power circuits which was first noticed on TV LOPT circuits was that the ions within the solder electromigrate over time to form a bad joint which looks fine but has high resistance. Normally takes a long time but if the joint was bad to begin with it can take as little as a month or so.
I recently repaired a laptop with this problem, the CCFL had detached from the connector at one end and this resulted in a dead screen which flashed when Fn+F6 was toggled. Goodness knows how many inverters get needlessly replaced due to this fault.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Steve McConner wrote ...
radiotech wrote ...
You cant turn a perf board into a printed circuit board.
Correct, this form of construction is asking for trouble, if there are no wires under that solder.
Agreed, I personally use 26ga solid core from old CAT5 cables. Cut and strip to roughly 8 inch pieces of metal wire. I only use solder to tack down the corners and maybe every 5 holes if its a long run.
Registered Member #2838
Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Next time try throwing a vary thin trace of buss wire under the solder. It seems to work nicely. Radioshack has a cheap roll that is pretty thin. Then all you have to do is tack it here and there on the board between connections so that it stays in place
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Conundrum wrote ...
Hint:- RoHS solder on CCFLs = BAD idea.
Actually lead free solders are less susceptible to electromigration (the reduced flow of the solder and increased brittleness might still make it a bad idea, but as for electromigration it's far better).
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I'm dumbfounded
