[time-nuts] thunderbolt fault

[francesco messineo]

Hi all,

A friend just received a thunderbolt from an ebay seller today and
asked me to check it and wire a quick power supply for him.
I used a switching power supply, pc-like, just for testing and tried
both lady heather and tboltmon. I wired the power lines as the TVB web
page, but connected only one GND line as the connector supplied didn't
have enough wires. The unit completes the self-survey and has all
outputs (10 MHz and PPS), however, the temperature starts at -0 C at
power on and in a few seconds settles to -1.249 C and never moves
again. Also eeprom contents is invalid at each power on and no setting
appears to survive after power off (not even the saved position).
Does anyone know if there's a simple explanation for this or a
possible common fault for eeprom and temperature or both eeprom and
termometer chip are probably bad?
I suggested the friend to ask for a refund anyway as my own
thunderbolt works fine with default settings.

Regards
Francesco IZ8DWF