Hi
FIrst of all I must say that I haven't build ICD2 so I can
only guide you here.
Have you read this, and made changes?
Check for shortcuts to/near the DG411, if you have you
might have damaged the MC34063. When verified the
PCB check the component values for the MC, like C R
and L if you can replace the MC aswell.
It wont help you now but might be usefull some other time.
hxxp://www.nomad.ee/micros/mc34063a/index.shtml
If you need more help try to giv more info like voltages at
the different pins of MC, if you have a oscilloscope you can
verify waveform with that.
Next time try to post in already available topic for ICD2,
easier for people to search and help you then.
Perhaps better if you repost your question in ICD2 topic
and remove your post here.
Good luck Cl