Question about Sherwood RX-4105 Receiver

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Sherwood RX-4105 Amp won't power on.

System won't power up. 5v Pre-environment supply is working. Has 5v to the power button, which drops to zero when you press the button. No lights, no display, no relay clicking.

None of the outputs or drivers are shorted. No sign of burned traces or components.

For a friend. Can't spend much on it since new ones are out there for about $120.

Thanks for thinking about it! Mike

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  • eclops Sep 30, 2008

    That's pretty good general advice, but a little too general for me. The amp has 3 circuit boards, control/display, receiver, and the distribution/amplification (maybe what you call "output") board. The output board only has one ic on it, and it is a little 8 pin dip that I don't think has anything to do with power up. I've already stated that I can't find any bad traces. Your general reference to a "distribution chip" I can't find helpful. While I am an FCC licensed electronics technician, I don't work on stereo equipment much and that description isn't helping me at all to find the problem. I need information relative to my specific model, something like "the problem is IC201. Replace that." Thanks anyhow. Mike

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If your power button light on the Sherwood will not light up as soon as you plug the unit up, and the power supply is working to the front board is working, you can't turn it on; the front board is bad. You would need to get a new front board from Sherwood. You just can't replace the chip on the front board, because that chip is programable, and the manufacture has the programming for that chip.

If you work on the Sherwood, be very careful, or else you could knock out both the front board, and the main board. Do not plug the Sherwood back up until all the scews on the board are tighten, all the connection plugs are connected, otherwise, you would knock out both the front board, and the main board as soon as you plug that Sherwood up.

Even if you get the parts yourself to fix your Sherwood, It would probably cost around more than half the cost of the Sherwood itself after paying to get that part shipped to you.

Posted on Feb 17, 2009

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Sounds like an open circuit on the output side of the board. you should be able to test the circuit on the output side if your comfortable doing this open the unit and use a multimeter. if there or no broken paths on the board then the fault is inside the distribution chip on the board itself. You can purchase these at an electronic supply store. just replace it. the cost should be minimal. please rate this thanks

Posted on Sep 30, 2008

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I think your gonna spend about 50- 100 to get it fixed. and then you might run ito other problems after that........ 120 is not bad for a new one sorry for the bad news good luck

Posted on Sep 30, 2008

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HI,

You will have to check the fuse.There probably is a fuse next to where the power cord goes into it. It will look like a little round black cap. It may be necessary to push on it and twist it in order to get it out. It will be marked on the case with a number followed by the letter "A", that being the fuse rating in amperes.

Posted on Sep 30, 2008

  • Priya darshan Sep 30, 2008

    If the fuse is blown then you will have to replace it.

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