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Fixing my Burn out Amplifier

Discussion in 'Chat Area' started by Ken80s, Apr 16, 2017.

  1. Ken80s

    Ken80s Well-Known Member

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    I jammed my stereo with the recent purchased singles consecutively for hours. The beat from the extended remix was just too hype and it overheats the amplifier until it give way. Was searching around town and lucky to find the exact IC ( LA4905 ), but was told that it has been obsolete and the shopkeeper suggest me to purchase all the remaining stocks from him, well I'm still contemplating whether shall I do so.

    Faulty IC.png

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    Last edited: Apr 17, 2017
  2. Ken80s

    Ken80s Well-Known Member

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    This is the faulty IC Amplifier

    IMG_20170415_132720.jpg


    Ready to fix the new IC and not forgetting to apply new heatsink compound.

    New.png

    Mission accomplished, my stereo fixed with a new amplifier IC and ready to go!

    IMG_20170416_142409.jpg
     
  3. Ken80s

    Ken80s Well-Known Member

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    Here are the culprits that blow my amplifier!!

    Picture2.png

    Picture1.png
     
  4. Ken80s

    Ken80s Well-Known Member

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  5. nickeccles

    nickeccles Well-Known Member

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    Ace repair buddy - these really aren't as hard to do as people think :wink:

    I would buy at least 2 spare ic's in case you do the same :biggrin:
     
  6. Deliverance

    Deliverance Active Member

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    Nice going Ken .
     
  7. Longman

    Longman Well-Known Member S2G Supporter

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  8. Ken80s

    Ken80s Well-Known Member

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    Thanks for the perspective. I have plan to use a simple USB fan or laptop cooler
     
  9. Boodokhan

    Boodokhan Well-Known Member

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    How did you find out what part to replace? or how did you figure out the problem was that IC?
     
  10. Longman

    Longman Well-Known Member S2G Supporter

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    That sounds like a good idea. From experience in building power supplies you don't need a very big or powerful fan to reduce temperatures a lot. I have a Panasonic 5 CD stereo here which was designed with a temperature controlled fan in the back, as do my two DVD recorders.
     
  11. Ken80s

    Ken80s Well-Known Member

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    In an amplifier, the component that susceptible to breakdown will be the amplifier IC either cause by output shorted or life span depending on the usage. For me I used to set to volume at about 60% for my listening. The higher the volume the higher the current will consume by the IC when heat is the next issue.
     
    Last edited: Apr 17, 2017
  12. LionHo

    LionHo New Member

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    Hi....I have a subwoofer with a built in amplifier, and recently the amplifier seems to short-circuit and usually blows my fuse almost immediately with allot of electronic noise coming from the amplifier a few milliseconds before.

    The amplifier that I have is an M-Audio BX10s. I just opened it up and there seems to be something brown has leaked out of the big coil, but has now hardened.

    turnkey pcb assembly
     
    Last edited: Mar 29, 2022
  13. Longman

    Longman Well-Known Member S2G Supporter

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  14. Jorge

    Jorge Well-Known Member

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  15. walkman archive

    walkman archive Administrator Staff Member

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    Glad that you like them :nwink:
     

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