9 Sep
2006
9 Sep
'06
9:48 p.m.
On 9/10/06, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Perhaps there was some PCB damage under the exploded cap? We had
a tantalum cap (16uF?) blow on a COMBOARD that was installed in a
crowded BA-11... it looked like someone shot the board with a .22. The
boards on either side were damaged as well, but not perforated.
Since the OP described blackening, perhaps it might be worth a few
minutes to gently remove the residue (95% Isopropyl (1,2-propanol?)) and
a soft toothbrush should get most of the crud off - then check the traces
and see if there's any visible damage.
Even if that's not where the problem is, a gentle cleaning should hurt
anything.
-ethan
So what I want to know is how the thing functioned at all without the =
cap (burnt carbon acted as a capacitor in some way)? and what caused it =
That cap[acitor was probably a tantalum electrolytic (this being the type
normally known for exploding in this manner) and was probably a supply
decoupuling capacitor. to stop
working.
Now that I don't know, but it may have nothing to do with that capacitor.