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Thread: Mackie Thump th15a issues

  1. #1
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    Mackie Thump th15a issues

    Good evening,
    I have subject active on the bench at moment. Flashing power led but power supply is fine 28vdc+- on the rails. Leave it switched on in 'flashing' mode for about a minute then the led stays on. barely audible sound through speaker. Could it be the caps in the power supply failing - although the voltage is steady - or is the amp board failed? Amp boards are no too expensive - I swapped out the TDA chip for a new 1 without any luck. I have a feeling the failure, if it's the board, is the small chip on the underside (which handily enough has no markings or identification).
    I would normally swap out the board at this stage but if that's not the issue (the LED thing is bugging me) where do you stop in replacing boards???

    Cheers guys.
    J
    In life there are no problems, only challenges but in my present situation I may have a problem

  2. #2
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    Jun 2014
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    scotland
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    Aha, after some further browsing the unidentified chip is the tda89xx class d
    In life there are no problems, only challenges but in my present situation I may have a problem

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