dead amplifier

Discussion in 'General Electronics Chat' started by misael.mata, Jan 23, 2015.

  1. misael.mata

    Thread Starter Member

    Aug 26, 2014
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    hello there, i have this little project im trying to get working, its a 2500 watt amp, the problem is its dead, i repaced all mosfets and transistors and resistors, fuses are good put it wont kick on, ive all ready replaced tl494 and still the same, help please
    i couldnt fine a shematic for this one but it looks like a simple circuit
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Without a schematic I 'd be surprised if anyone here could do other than just guess what the problem may be :(.
     
  3. bwilliams60

    Active Member

    Nov 18, 2012
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    You could start perhaps with make, model and an application. Automotive, home ?????
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,000
    3,229
    If you call that board simple, I don't want to see what a complex one looks like. :rolleyes:

    Looking at the circuit board tells us nothing about what the problem might be.
    Need a schematic.
     
  5. misael.mata

    Thread Starter Member

    Aug 26, 2014
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    sorry guys its a automotive amplifier its a kole 2500 watt amp, would anyone have a shematic for this one..... thanks
     
  6. misael.mata

    Thread Starter Member

    Aug 26, 2014
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    by guessing what it is, what would be the problem with it??
     
  7. wayneh

    Expert

    Sep 9, 2010
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    As long as we're just guessing, I'll say it's the electrolytic capacitors. Get an ESR tester and check them, or just replace them.
     
  8. sheldons

    Active Member

    Oct 26, 2011
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    Before you start, inspection of soldered joints would be a starting point, then voltage measurements, what have you done so far? Is there any signs of life on switch on at all? Am busy consulting my Crystal ball awaiting your reply. ....
     
  9. #12

    Expert

    Nov 30, 2010
    16,261
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    Does this Kole amplifier have a model number?
     
  10. misael.mata

    Thread Starter Member

    Aug 26, 2014
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    power supplythanks guys well gues what..... i checked for shorts, everythingis in order, and well i thought, hmmmm, i wont lose nothing if i resolder the whole board, i did that, and hooked it up and bam it turned on, sounded nasty but i cleaned the gains on it, and now is working perfectly, thanks everybody more years more experience, yall have a good afternoon.
     
  11. #12

    Expert

    Nov 30, 2010
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    Sometimes you get lucky!
     
    Lundwall_Paul likes this.
  12. bwilliams60

    Active Member

    Nov 18, 2012
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    Boy and I was just going to guess that one of those replaced transistors was bad. Oh well, there will be another guessing game somewhere :)
     
  13. Rocket.Man

    New Member

    Jan 1, 2012
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    My son got a free car amp given to him the guy said is does not work. It appears to be a simple amp with 8 power transistors first thing I suspected was someone shorted the output and killed the power transistors. I de soldered the transistors and they all test good. I put the amp back together and it still does not work. After some more experements i lean the volume control does not work. I soldered in a used replacement part and the amp works good now.
     
    Lundwall_Paul likes this.
  14. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Man I'm jealous... it took me weeks to fix my first amp...
     
  15. wayneh

    Expert

    Sep 9, 2010
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    Gotta love the occasional success of brute force.
     
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  16. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    Or of wild guessing...
     
  17. snav

    Active Member

    Aug 1, 2011
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    Shotgun repair
     
  18. Rolland B. Heiss

    Member

    Feb 4, 2015
    236
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    I've got an ICE amp in the garage that doesn't work and y'all are making me want to take it apart again and figure out the problem. Everything looks fine to the naked eye! Bought it for about 450 bucks and only used it about 8 times before it stopped working!!! Sounded great those 8 times or so but when it stopped working it was of course past the time the store allows in order to exchange it or get a refund. :mad:
     
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