I've got a cheap power block that overheated, and bit the dust! Funny thing is, it actually has a regulation circuit to regulate +5.2 volts. Anyway, The transformer's primary is open(thermal fuse blew). It seems to be a small transformer for a 500mA rating, don't you think! I think the super thick heat-sink/chunk'o-metal is not suitible for the transistor in the regulator circuit, and believe it or not, the transistor has no brand/company logo on it! Stuff like this is getting more common nowadays.
What a shame!
What a shame!