Dan,
Make sure you don't have installed U7 (the EEPROM) in the wrong way.
Check where pin 1 is located and that is the IC side with the notch.
Also check U8 for reversal, this could pull down the I2C lines to the
EEPROM. Do this check also for U4 and U5 on the RF board, they also
share the I2C lines of U6.
Also check RP7-1/2 which is pulling down SDO on U7. As a last thing I
can image, check if X2 is a 4MHz crystal and not completely detuned. If
you do have a scope or external frequency counter handy it should show
around 4MHz at U6-13/14.
If none of this helps, U7 might be damaged.
73 Gernot DF5RF
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