Make sure he makes it back together...
No, don't.
If he desconstructs his favorite electronic toy and isn't able to get it working again, that's an opportunity for a lesson on how to take things apart without causing (more) damage, how cheaply and non-repairably many things are built (and the value of good design), how anything is repairable if you're cussed and resourceful enough (and when not to be), or any number of other lessons, limited only by your imagination.