DM800HD SE v2 L1117 burnt

Discussion in 'Hardware troubles and Repair support.' started by vivastar, May 17, 2018.

  1. vivastar

    vivastar New Member

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    Hello
    this morning, power outage in the room, I found out the FI triggered and the cause what the dreambox (clone)
    REV E board. I found out the L1117 is all black, I saw in a previous post that The value for this inductor is 0.56UH 0805 ±10%, is that still accurate on a SE v2 version ?
    Any schematics for the REV E board maybe ? Beside just changing the inductor, or at least trying anything else we should do. beside checking other parts and measurements around that area ?
    Thank you
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    No sorry, I have not made any schematic of the dm800se V2 but basically it has the same voltages as the older ones, only the Dc to Dc circuit parts has been modified, thus made easier for repairing.
    As for the L1117, the ground inductor concerns, if it's still passing trough the voltages then you my assume that it's fine, same as the L1104 which is for the 12v plus side.

    Anyways, if you have some short circuit to the 12v input side than the first thing to do is to check the diode between the 12v pul/minus side, when fine then it can be one of the Dc to Dc ic's because these are feed from the 12v, and converted to as lower voltage as 5v, 3,3v etc.
     
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  3. vivastar

    vivastar New Member

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    Hello Johnny
    Thx for the reply, it looks more complicated than I thought, we were just gonna try buying the inductor and replace it. It is really fried and burnt, so box is of course not powering up anymore. When my electrician is coming I guess we have to check everything before trying a repair.:)
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Best is to use a power supply with a amps display and overload protection, or using a multimeter set to amps to see how much the board consumes.
    Other way to known if the board has some issues to/from the 12v input is to measure the ohms value between the ground and the 12v plus side.
    In any case, this inductor is from the ground side and may burned due the power supply itself when it's became defective, or in some cases due a internal hdd, when present.
     
  5. vivastar

    vivastar New Member

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    Yes that's what I think, power supply had a very bad smell, and kinda melted ...
    Thank you for your advices ,we know what to try and hopefully we can fix the board.
     
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  6. vivastar

    vivastar New Member

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    Hello Johnny
    We changed both L1117 and L1104 with some 0.47UH 0805 (what we found)
    all worked fine for 2 hours , then box shut down and wont power on anymore, power supply goes in safe mode
    I was wondering if you had the value of the L1104. I will check measurements later today when I got my tools back .
    Thx

    If same as the Dm500HD it is about 0.33UH 805 ?
     
    Last edited: Jun 11, 2018
  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Sorry but I can not say the correct value of the dm800sev2 but to me it should work with the same values as the dm500hd has.
    Mostly you can feel on the inductor if it's suitable to use, if it's become hot, then it may to low.
    However, inductors may also become hot due a heavy amps consumption of the circuit, often due a defect.
    Therefore I always check the total amps consumption of the box.
     
  8. vivastar

    vivastar New Member

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    Hello Johnny
    I was thinking of something those inductors how much do they handle ?
    the ones we used are :
    CMS 0.47 uH 1100 mA ±20%
    If they have to handle 3000mA that may explain why it died again ...
    Thx
     
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    The total amps consumption of the box never exceed the 2 amps, it's with HD channels normally something as 1.30 amps.
    Thus a inductor of 3000mA which is 3 amps should in normal situations be sufficient.
    An 1100mA which is 1.1 Amps is to low, it may work with SD channels, but on HD it may eventually burn.
     
  10. vivastar

    vivastar New Member

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    Yes but, those inductors are supposed to handle up to 1.4A by the construction in layers ..
    Dont you have by any chance a link of a good L1117 match so we can compare values before ordering another batch.
    We got this to replace the L1117 and L1104 : http://katalog.we-online.de/pbs/datasheet/74479775147A.pdf
    you think the rated current was too low ?
    Thx again for your help
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I can only give the inductor specs from a 800HD which are for the plus side 0.56uH 0805 ±10% and I always used the 2.1A version
    You can see them with several amps by mouser as for example this one.
    and minus side 0.33UH 0805 ±10% and also the 2.0A version as this one.

    As for the dm800se, it should be logic that these values are the same, in any case, I always used these also on the dm800se and dm500hd without problems.

    If, they become hot, or get damaged then the most logic thing to think of is that the motherboard consumes more amps than normal, mostly if that happens it's due a defect, of worsen, a bad cpu.
    However, when the motherboard gets a lower voltages than the 12vDc, let say 11v, the amps consumption could rise, and the inductor may become also defective.
    The motherboard needs at least the 12vDc, better is that it's between the 12v and the 13v and at least a 3 amps power supply.
     
  12. vivastar

    vivastar New Member

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    Hello Johnny
    finally got some new inductors but now we found out c1102 is dead too, was doing a short circuit and it broke pulling it out.
    do you have by any chance the value ? couldn't find it on the drawings
    Thank you for the amazing support
     
  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I have here measured a value of 1uF and probably a 16v version.
     
  14. vivastar

    vivastar New Member

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    Thank you Johnny
    I didn't have the tools to measure that, so we can order that part now . thx
     
  15. vivastar

    vivastar New Member

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  16. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah the ceramic cap sizes are always difficult to choose the correct one.
    But to me it seems to be the 1uF 1206 16V +80% -20%
     
  17. vivastar

    vivastar New Member

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    Hello
    Johnny. after changing the inductors and the ceramic caps box has been running for 4 days fine
    Really appreciate your help and advices ..

    I still have sometimes the Empty Tuner symptom when shutting down the box and restarting it .
    Since we got spares might as well change that L1300
    it is a 0.56uH 0805 2.1A +/- 10% ?

    At least the other dm800se v2 we got all are working fine, but now in case we know what to check :)

    Regards
    -P
     
  18. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Always nice to read that success has been achieved with a repair, thanks for sharing it. :)
    And indeed, you can use this 0.56uH 0805 for the tuner 5v L1300 inductor, it should be the same value.