Later in the thread you say that you powered teh board from the back-up battery... check that the back-up batter is charged. The IR board has a 5v regulator on it so it needs at least 7V to "power up" the regulator.
A dead (dying) battery sounds like a likely villian.
Quote:
Originally Posted by keen101
"I broke" our board today.
It was working fine, and then all of a sudden.... nothing worked. It suddenly got quiet.
I suspected the 5V 78LO5 was bad, so I asked my dad to help me diagnose the problem. Sure enough the regulator was bad. So my dad helped me find a suitable and more robust replacement. We put in a new regulator, and now it works great again!
...My advice to anyone with a quiet board, is to check the regulator.
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I just weighed myself and I have gained two pounds since last Saturday. Thats a sign of a good robotics team. - russell [more] 
16-02-2008, 20:46
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