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Thread: Behringer DX3216 help needed

  1. #1
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    Behringer DDX3216 help needed

    Just bought this secondhand, was assured that "it has only crashed once, a long time ago".

    Left it on for a couple of hours to test that it was going to be ok to use live, it froze. When I turned it off and on again it was the same.
    I left it off for a couple of hours, turned it on again and it was fine, fully functional.

    Left it on for a few hours again, had frozen again. This time, no amount of waiting makes a difference.
    On switch on, I get alternate lights on all the sections, LCD can be black, stripey or clear (different when switched off and then on again, at random).

    whole-desk.jpg buttons.jpg display.jpg

    I've taken out the power supply and tested all the voltages at each of the pins with a voltmeter, they all seem ok.

    Close inspection shows that the PSU looks ok - there's only one suspicious looking capacitor (slightly domed on top, little mark in the middle - see photograph).

    cap.jpg

    Any ideas what to try next?

    Thanks
    3rddawn
    Last edited by 3rddawn; 12-28-2011 at 08:49 PM. Reason: typo in title!

  2. #2
    Supporting Member Jazz P Bass's Avatar
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    That capacitor does look a little bit "domed".
    Can you push down on it? (the cap)
    If it moves back down, then that is possibly a bad cap. (hydrogen gas venting)
    Not having the power supply schematic, I do not know the function of that particular cap.
    Did you try testing the power rails with the unit hooked up?
    If not, that is a good place to start.

  3. #3
    Noodle of Reality Steve Conner's Avatar
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    This is a DDX3216, right? Not a DX3216.

    We had a big repair thread on these things a while back. There are several known faults. Use the search function to look for DDX3216.
    "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

  4. #4
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    Steve: Sorry that was my typo - it is DDX3216. I've read and reread all the threads before posting above. They don't seem to relate to my problem.

    Jazz: Having found all the power rails seemed in order with no load, having hooked the PSU back up and tested it again, now I'm showing no lights or display or anything. The 8, 17, 48V all seem ok, but the 5V pretty consistently show 72mV across the connectors and the 3.3V ones are showing nothing.

    I can do soldering etc, but just don't know enough about electronic circuits to know what to change.

    The schematics of the PSU are available on the repair thread Steve mentioned. I'd repost but I've tried 4 times and my PC (in 2 different browsers) has decided to crash every time ... sorry!

    Thanks for any help anyone can give.

    Cheers
    Lawrence

  5. #5
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    Lawrence,
    Almost certainly that capacitor!!!

  6. #6
    Noodle of Reality Steve Conner's Avatar
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    I agree, the capacitor looks like a sick puppy! I just saw it now, wasn't able to load the pictures before (my own fault, not the forum)

    You might as well replace all of the big electrolytics.
    "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

  7. #7
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    That's a bad cap, and for the record, you should just recap the entire supply, using good caps e.g. Panasonic or Nichicon in 105C temperature rating. You will need to physically measure the existing caps and compare them to the catalog measurements because they are a somewhat tight fit.
    John R. Frondelli
    dBm Pro Audio Services, New York, NY

    "Mediocre is the new 'Good' "

  8. #8
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    hi! i just signed in!
    I have the same problem with my behringer ddx3216. error +1 8!
    It started with my display going dark (slowly over time) until it was to hard to read. All the rest working just fine!!
    i took some mesurements of the voltages and most of them were higher than they should be!
    so i did a recup most of the psu (not all of them) and i reconnected everything back!
    at bootup ,most of the led light up and i got error +1.8 ! i tried factory reset but it didn't work!
    Can anybody please give me a hand with this?

  9. #9
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    I ended up sending it to Electronic Music Services in Southend on Sea, who sorted it out. Many caps needed replacing, they overhauled the PSU and sorted some other problems which had also appeared with some of the other boards. They were excellent, I'd highly recommend them if you're in the UK.
    Lawrence

  10. #10
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    Hi I am new here and have got this DDX3216 from a friend who said it was working perfectly and had shipped it to me.
    When I unpacked and powered it up, everything came on except the LCD which only lights up abt half and is completly black.
    Have been trying to fix the issue but I am not very experienced with LCD's
    Is it a fault of the LCD or any other IC, PSU related issue?

    Any help would be highly appreciated.

    Thanks

  11. #11
    Supporting Member Jazz P Bass's Avatar
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    What on the LCD is 'lit up half way'?
    Are all of the characters showing, top & bottom of screen?
    Or is the backlight lit poorly?

  12. #12
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    Quote Originally Posted by Jazz P Bass View Post
    What on the LCD is 'lit up half way'?
    Are all of the characters showing, top & bottom of screen?
    Or is the backlight lit poorly?
    Hi,

    No there are no characters or graphics displayed just a black patch abt half way of the lcd.
    Tried playing around with the connector and only get the LCD to partly go black.

    Thanks

  13. #13
    Supporting Member Jazz P Bass's Avatar
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    Well, either the character generator IC (part of the lcd) is bad or someone took the LCD apart & did not assemble it correctly.
    It can be real tricky reassembling an LCD.
    The two silicone conductive strips have to be very clean.
    And the tension of the frame has to be consistent all the way across.

  14. #14
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    Quote Originally Posted by Jazz P Bass View Post
    Well, either the character generator IC (part of the lcd) is bad or someone took the LCD apart & did not assemble it correctly.
    It can be real tricky reassembling an LCD.
    The two silicone conductive strips have to be very clean.
    And the tension of the frame has to be consistent all the way across.


    Thanks Jazz,

    Will try taking the LCD apart anc clean the silicon strips and give it a try.
    or could i just replace the lcd?

    Thanks

  15. #15
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    A
    Also noticed the IC T6A39 gets very hot cannot touch it could it be the problem?

  16. #16
    Supporting Member Jazz P Bass's Avatar
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    I would not think it should get hot.
    Unless the lcd is really bad & pulling current from it.
    http://nk36.free.fr/Blog/Electroniqu...raph/T6A39.pdf

  17. #17
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    Hi Jazz,

    Could i Replace the LCD with the same specs 240 x 64 but that has a T6963C controller? Would it work?

  18. #18
    Supporting Member Jazz P Bass's Avatar
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    I am not about to look up the datasheet for a T6963C.
    So I do not know if it will work 'correctly'.
    But I will say that the controller IC is what 'IS" the display.
    The characters that are diplayed come from the controller ic.
    If anything about the two is different, then the display will be different.

  19. #19
    Noodle of Reality Steve Conner's Avatar
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    Earlier the T6A39 was mentioned. This is a LCD column driver chip and it is usually used along with the T6A40 row driver and T6963C controller chip.

    So the presence of a T6A39 implies that the controller chip is a T6963C and therefore a replacement display with a T6963C should also work. It doesn't prove it 100% though. Before buying a new display, examine the old one to see if you can find the T6963C.
    "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

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