[amsat-bb] lvb tracker circuit -- xtal?

Hi, I have problems in making the LVB tracker circuit run.

I have built the LVB tracker ver. PCB v1.2, Firmware v0.7, Programmer v0.2, Documentation v1.9,  7 Dec 2004, by G6LVB.

The firmware was flashed successfully with IC-PROG v 1.06B, a homebrewed interface for LPT, and an old PC with LPT1 running win98.

The LVB circuit requires a 4 MHz XTAL for the PIC 16F876A.

I tried with a 10MHz, and a 3,5795MHz as I haven't a 4MHz. No success. No LCD, no serial communication at all.

Does anybody know if the problem could be in having installed a different xtal (i.e.: does the firmware takes care about the frequency of the clock?)?

Regards, Stefano Simonetti (IW1RDZ) - Italy.