30 Aug
2011
30 Aug
'11
12:26 a.m.
At this stage you need a good dvm (many digits) with good low
resistance measurement facilities.
pick some 0v place make a good connection to the dvm and them go
around the 5v line looking for the smallest resistance to 0v, You are
actually measuring the track resistance and minimizing the amount of
track to the short eventually one finds an area, now do the inverse
use that as the connection point and measure the 0v resistance to that
point you should arrive at the other side of the faulty part or very
near.
One can use this method to find pcb solder shorts during manufacture
and etching fault shorts too.
Dave Caroline
On Tue, Aug 30, 2011 at 7:22 AM, Mike van Bokhoven <mike at fenz.net> wrote:
Curses... all memory out, problem persists. Noted that
one of the 4116s is
missing a leg, and another has had a prosthetic leg added at some point.
Next step: turns out +5V is shorted to ground. Looks a lot like one of the
(presumably tantalum?) +5V HF noise capacitors has shorted. Anyone know any
tricks that could save me from having to unsolder and test them one by one?
There are a lot of the things, >30 at a glance. Will persevere...
Cheers,
Mike