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Unit won't power up completely

When I turn the unit on, you can hear a click (which is normal) and the power light comes on, but the display does not come on and none of the buttons do anything. If I hit the power button again, it clicks again as normal and the power light goes off.
Is the unit worth repairing or is it time to retire it?

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  • tlaporte Jan 28, 2008

    Thank you for the input. I found the fuse on the transformer circuit board blown. I replaced it and the unit came on okay, but it always goes into the protect mode even with nothing hooked up to it and regardless of where the volume control is set. Also, one of the heat sinks (there are 3 unfinned heat sinks side by side) on the main circuit board gets really hot quickly. I'm sure that is what caused the fuse to blow, but I don't know if its worth trying to fix.



    Tom

  • simmering Jul 17, 2008

    I have the same "Protected" problem but it's sporadic.

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The clicks you hear are the relay that completes the circuit for 110V AC to the main power transformer. Mine had the same problem and here's how I've gotten it to work. A lightning strike near our house caused it to fail, and I traced it to the power transformer relay activation circuit. The tuner and amp were fine. I found a bad transistor in the relay circuit, but didn't have a replacement on hand, so I soldered a jumper wire across the relay switch connections on the power transformer circuit board. This connects the 110V AC directly to the power transformer. DC Power to the amp and tuner circuits will still be controlled by the power switch, but the transformer will be supplying all the AC voltages to the main board. If there is a real problem with the circuits that load the transformer or the transformer itself, then the fuse will blow. If the fuse doesn't blow then I suspect the problem is just in the power sequencing circuit itself, that is not needed for operation other than to make the unit "Energy Star Compliant". A lot of electronic items have a transformer that is not switched, and only fused, so that the supplies are available at all times.

Posted on Jan 27, 2008

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