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Lil help i have a kenwood kr-a4080. when i frist got it start to heat up really hot on the one side cloest to the dials (on the top) so i put a cooling fan on it to keep it cool that worked for a bit then one day it just wouldn't stay on. push the power button u here a click screen come on then click goes on flashing stand by. so i open it up n obereved two resitors blackend (r161, r163, 230 ohm each) and black areas on the board in Q23 and Q25. Replaced resistors with 270ohms and turn it on did same thing as before but it did turn on for sec then both resistors blew n went back to the way it was before, does ne one know whats wrong with it and how to fix it ?????

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  • Anonymous Mar 27, 2008

    it was just used for audio from the digital box cause the speaker in the tv don't work so we never cranked it or nething like that, never had a problem audio wise i have custom 5 way speakers,

    driver circuit where are they located on the board n how do i test to see if they blown ???

  • Anonymous Mar 27, 2008

    is there a way i can do it my self, i just need to know what parts i need to fix, if u need to see the area i can take a snap shot, i got lost of parts i can use and i good with a soldering iron



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I would guess that the speaker(s) on that side have a problem and have caused the amp to work too hard. That resulted in that channel failing. The resistors are probably feeder resistors and are smoking because too much current is being drawn. The output transistors on that side are shorted and need to be replaced. It is possible that the driver circuit also has failed. This unit needs service. If a unit really heats up under normal conditions (relatively low volume levels), there is a problem that requires service.

Posted on Mar 26, 2008

  • ABRsvcs Mar 27, 2008

    Without seeing this on a bench, I can only speculate about the possible problem areas. It is possible that the "front end" of the system is passing some DC voltage to the amp section. A little of this won't be a problem, but too much can be hazardous. Also,. there could be defective parts that are causing some oscillation at high frequencies (too high to hear) and that will put a significant load on the amp without harming the speakers. (The speaker internal crossover will shunt these to ground.) This repair should be fairly straightforward for a service shop. Expect a cost of $20-$50 for parts plus the local labor rate.




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