Before you yank out the IRF, do this check:
Power the board and final, disconnect MIC and with PTT pressed check if 12V is getting to the IRF drain.
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At 09/07/2017, you wrote:
I have some IF510's on order. I hope that's the problem because it will be an easy fix. It's worth a shot.
I've never tried transmitting with this radio without a dummy load attached.