25 Aug
2010
25 Aug
'10
6:58 p.m.
Actually, on many boards there was effectively the copper went all the way thru the hole
("thru hole plating"), thus providing continuity from one side to the other.
Only on really cheap / very early boards did soldering provide that thru-the-hole
connection -- it caused reliability problems (surprise surprise).
Even without that, grounds specifically tend to be run as busses, and so missing one
thru-hole connection on the ground buss would probably be no big deal, as there are
probably tons of other connections where ground is passed thru from one side of the board
to the other.
So, as long as that pin is soldered to the pad on top, and so long as that pad runs to
ground somewhere else *OR* so long as the thru-hole plating is intact -- no biggy.
Either way, it is almost certainly fine just the way it is.
JRJ
---- dwight elvey <dkelvey at hotmail.com> wrote:
From: ard at p850ug1.demon.co.uk
---snip---
WHile cleaning the dirt off this PCB (HV attracts dust electrostatcally,
of couse), I noticed that the ground pin of this IC never made it through
the board. It's folded under the package, but has been effectively
surface-mount soldered to the pad when the board was wave-soldered. It
works, but I can't beeleive it's as good as a proper through-hole
connection, and it's certian;y not what was intended.
I could trivially desolder the IC, straighten the pin, and solder it back
properly. But should I? What would others do?
-tony
Hi
First, can you explain how it works as is?
Being one shots, such a fix might effect the timing. Is it adjustable?
At a place I once worked, we had a board where the +5 was missing from
a CMOS part. It was running from the inputs that luckily always had
at least one high.
Dwight