How do I know if a PIC is dead ?

[skimask]

Rngd,
For times like these (suspect RIP pic) I load it with a very simple LED blinky program which flashes all the ports on and off. If that works than I know that the pic is OK.
;P
Squib

Amazing how it always goes back to ol' blinky isn't it?

[mindthomas]

Amazing how it always goes back to ol' blinky isn't it?

Ya.. It's a good basic beginner, and testing code

[falingtrea]

If you did something to the Vref pin, you only may have messed up the analog circuitry. I would do an LED check of the specific pin you overvoltaged. Also was the voltage directly on the pin or through a series resistor? The resistor would have probably protected the pin.

[Ingvar]

Overvoltage with no current limiter is more or less a bulletproof way to fry a pin on a pic. I've never seen the entire pic beeing fried from it though.