When dealing with radio programing and serviceing, some times it is easy to forget the simplest things.
Like, is the radio off when pluging any accy into it, (this includes headsets, spkr/mic's, programing cables)?
I say this because a lot of radios have a voltage on some of the circut and if the radio is on then you have a shop across the ins.
Make sure radio is off, and FURIMLY seat the cable, then power on, then see what happens.
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