I need some help identifying a crystal.

[DC Jack]

I am trying to fix a friends "bow string weight guage", basically an electronic scale that hooks on to a string. It slipped out of his hand when he was testing a bow and shot it across the room into a wall like an arrow. Everything looked fine but the unit won't turn on now.

I took the thing apart and can't find any physical damage and all the components pass my DMM sniff test and from past experience I know that crystals can fail due to shock damage much more easily than other electronic components. I'm hoping to replace the crystal and be done with it because if it is the PIC that is damaged then he is screwed because there is no way in hell I am going to be able to get my hands on the programming to make a new one.

The problem I am having now is that I can't figure out what the crystal is. I Google'd the only markings I could find on it and nothing of worth comes up. I also have no experience with PICs so I can't make any educated guesses as to what it could be. Any help or advice would be appreciated.

P.S. I have attached pictures of the crystal, board, and the PIC.
P.P.S. I am getting all the appropriate voltages and am assuming that the PIC is simply not turning on.
P.P.P.S. I posted this on the BadCaps forum and it was suggested it is a 4 Mhz crystal because of the 4 in the markings.

[xyrtek]

Is the xtal the clock source for the pic? or is it connected somewhere else in the circuit?

if yes to the first question then check the datasheet for the pic to see possible clock options.

EDIT:
http://ww1.microchip.com/downloads/en/DeviceDoc/39544B.pdf

I say yes by looking at the pics, then check page 99 for details.

If you have a scope solder the xtal back and probe around it.

If you can identify the values of C11 and C12 (i think) you could reduce the choices by looking at table in page 99

[PA0PBZ]

* put a 4 MHz crystal in and see if it works
* make a simple oscillator using a 74XXX TTL/CMOS and see if the original crystal oscillates
* get your function gen out and inject 4 MHz into the correct pin
* did you check if it oscillates in the original circuit?