Andrew Wilson wrote:

> My olimex ICD2 stopped responding to the computer the other day.  It
> acts the same plugged in, as if it's not connected to a power source
> (wall ac adapter).  I had a PIC connected via the ICP connector to the
> programmer, and I think I hooked a +5v power supply source to the gnd
> pin on the chip, and gnd to the Vdd pin on the chip.  I would hope that
> the programmer would be somehow isolated from this and just the PIC
> would fry, but is this incorrect?
>
> The voltage regulator on the programmer gets rediculously hot now (I
> don't recall it getting this hot before.)  As in it melted some skin on
> my middle finger when i accidentally touched the heatsink of the
> regulator..
>
> What component is likely to fry in this situation, and is it an
> easy repair?

OK, I have never owned an olimex ICD2, but I have experience of fixing
faults like this.  If the regulator is getting that hot, it is either faulty
itself or it is supplying too much current to the rest of the circuit.  In
the latter case, something else is probably getting hot as well (taking all
the current).  You can spray a component freezer all over the board and then
switch on the device.  If the ice melts very quickly on a particular IC,
then I would replace it.  If not, replace the regulator.  It might not be as
easy as that though, as a different IC may have failed causing the one you
replaced to fail and get hot.  In this case a circuit diagram would be
useful.

Brian.

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