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My Harmon Kardon AVR 144 had sound via all the connection but now it will only play the radio and none of the settings were changed. I tried checking for shorts in all the speaker wires and power supplys, but nothing. Do you have any solutions?

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Since it does work with the tuner, your speakers and speaker wires can not be a problem.

Since you have also checked all the settings, it is not that either.

What this does sound like to me, and I have been repairing A/V receivers for over 17 years, is a problem on the input board with a switching IC. These units have electronic switching not mechanical. It is stuck in the tuner mode and there is nothing that can be done by the end user to fix this except to reset the unit. Unplug it from the A/C output and let it sit for at least 4 to 6 hours. Even longer if you are not in a hurry. That way if the problem is just a software glitch in the microprocessor it will return it to the factory preset condition.

If this does not help you the only way to get it working properly would be to have it serviced by a professional. You would need a multimeter, O-scope and soldering iron to check it yourself. If you have those tools and know how to use them I can guide you thru troubleshooting it. if not just take it in.

If I can be any further help just let me know.

Dave

Posted on Jun 28, 2008

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