Thanks for the reply.
There shouldnt have been any phantom coming from input he gave you...where did he get the signal from?
That's a very good point - I'd not been thinking this through properly...
I had my phantom on because it was needed to run an ambient mic the soundman suggested adding in - not something I particularly wanted (as I was running a separate audience tape) but he was so enthusiastic, it seemed rude to decline...
I pointed out that there would also be phantom on the fourth source he plugged in (which I think was meant to be the lead vocal alone) but he plugged in anyway (TRS via TRX>XLR adaptor into my right XLR-in), checked something on the board and was happy to leave it plugged in.
If you had your phantom on - whatever blocking circuitry the board had might have caused your phantom to fry...might want to check with the soundman - ask him about the cable. Maybe had it wired oddly. And ask if he has had any trouble with the output he gave you (he may have some damage if you had your phantom on)
I think this may be the case. I'm not sure if he'll be aware of any problems with the board as I'm pretty sure he said it didn't belong to him and that he hadn't used it before.
I'm still unsure of the sort of damage that is likely to have occured to my box - a matter of a couple of fried components or will I be looking at replacing ICs?