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Onkyo TX-28 Receiver Output Problem

I have an unusual problem. I have an Onkyo TX-28 receiver. When I got the unit I connected it up and the right channel put out distorted overdriven audio and the left channel had no audio. I looked inside and the left channel fuse was blown. I replaced the fuse now the right channel has no audio and the left channel puts out the same distorted audio. When I remove the left channel fuse it reverts back to its origial state. Quite a puzzle. Thanks! DJ...

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  • djhack
    djhack Sep 04, 2007

    No, I am positive it is the speaker fuses. The power fuse is near the power switch.


  • djhack
    djhack Oct 18, 2007

    After checking out all the supporting components. I replaced the STK amplifier chip and it works fine now.



  • Regena Apr 02, 2008

    I have the same problem. Where did you find the STK (power envelope chip)?

  • n_iversen Apr 22, 2009

    I also just picked up a TX-28 that's exhibiting pretty much the same problem.
    djhack or Regena, where did you get your new chip from?
    petraman7, the chip is a Sanyo STK4863.

  • Scott Frye
    Scott Frye May 11, 2010

    If someone could get the STK number off the amp module, I can suggest where to get some.


  • Anonymous Mar 14, 2014

    can this system be set for the knob to be turned left and right to go through the channels. the way it stand i have to click the top of the knob to get to channel which while driving can cause problems.



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You may be confusing +/- power supply rail fuses with left and right speaker fuses.

Posted on Sep 03, 2007


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