Kia Troubleshooting Questions? Ask a Mechanic
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There are 2 fuses. One is labeled "Audio" and other D/Clock. Did you check them both? If so, check to see if they both have power with key on and let me know. Thanks.
It sounds like wiring, you can check fuses for power with multimeter or test light. Let me know how it goes, thanks.
I agree with shop if power on both wires and ground is good then new radio must be bad but there is a chance shop didn't do testing right so I'd consider doing it yourself. Let me know if you have more questions, thanks.