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Thread: Behringer DDX3216 - Trying to repair, please help!

  1. #281
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    I personally don't think an ADT1616 or any other expansion card could kill the CPU as looking at the 50pin connector pin out most of them are relating to the digital audio I2S busses leading to the DSP board and power and there's only a TX/RX on pin's 40 & 42 going to the CPU,
    I'd say it's more likely a power supply issue maybe due to the increased demand's on it after fitting the card,
    is it turning on at all or even attempting to start up ?
    if it's getting as far as displaying the DDX3216 on the screen and freezing try replacing the watch crystal on the CPU board
    as stated me and EEngo unfortunately plugged in the wrong power connector into the CPU board when putting it back together and turning it on

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  2. #282
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    yes, I think you are correct.
    the most probable (and definite!) cause for a dead CPU is using the wrong power cable. I don't think there is a second way to fry a CPU in general use. As the CPU is not consuming a lot of power in normal operation, a heat-related failure is also very unlikely.

    The main problems of the DDX are still heat in the power supply (therefore failing caps, regulators and diodes in the power supply), failing caps in general (especially on the LCD board) and a swapped power connector on the CPU card after cap exchange

    I have checked with a thermal camera, but there are no heat issues with CPU or DSPs. Apart from the power supply the ADCs are running hot, too, but I have never seen a failed ADC so far.

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  3. #283
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    Quote Originally Posted by EEngo View Post
    yes, I think you are correct.
    the most probable (and definite!) cause for a dead CPU is using the wrong power cable. I don't think there is a second way to fry a CPU in general use. As the CPU is not consuming a lot of power in normal operation, a heat-related failure is also very unlikely.

    The main problems of the DDX are still heat in the power supply (therefore failing caps, regulators and diodes in the power supply), failing caps in general (especially on the LCD board) and a swapped power connector on the CPU card after cap exchange

    I have checked with a thermal camera, but there are no heat issues with CPU or DSPs. Apart from the power supply the ADCs are running hot, too, but I have never seen a failed ADC so far.
    Then mine is the exception to the wrong power cable. The CPU just went dead out of the blue during a mixing session and others have had the same happening to them. Sudden death of CPU with X-mass tree lights as result. Mines also had the LCD going blank but rolling like with a bad horisontal synced crt screen. That was say 20 minutes after the unit had a used ADT1616 plugged into it and working fully! Mind you, no power cable switching or whatever involved here. When I was about to litepipe it with a Yamaha AW4416 I suddenly saw with the white of my eyes something odd happened to the DDX. And that was it.

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  4. #284
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    [QUOTE=I'd say it's more likely a power supply issue maybe due to the increased demand's on it after fitting the card[/QUOTE]

    i personally would say it's probably due to the increased demands on the ageing power supply after fitting the extra card's that was probably already on it's way out, as EEngo stated, the built up heat cannot escape from the power supply enclosure and cooks the capacitor's dry, the smoothing cap's are common resulting in increased ESR and thermal runaway as thay basically become more like a resistor in circuit made worse by increased load creating unstable/noise on the DC output that would be sending the CPU unstable mainly i'd check the 3.3vdc and the 5vdv as i'm shore they also power the expansion slot's to see if there in spec and if there's any ripple/noise/AC or increased voltage or spikes on the power supply that could be responsible,

    as i asked before, "is it getting as far as displaying the DDX3216 on the screen and freezing ?" or is the unit just totally dead ? lighting up like a Xmas tree with a black screen ?

    what makes you think the CPU is dead ?

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