help me extrembox 800hd

Discussion in 'DM800HD Hardware troubles and Repair support.' started by tinoco, Jan 24, 2019.

  1. tinoco

    tinoco Member

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    hello colleagues can help me I am new here in the forum I have an extrembox 800hd with problems I connected to the 12v charger and started and to throw some smoke in the zone of the entrance of the current.
    When I disassembled I had a burnt parts I made an adapter to repair the burned parts but problem is that UGG U25 A U26 CONDENSATORS C11 C12 C113 C114, C97, among other components in a circuit.
    When I measure them with a voltmeter so much whistle in the positive as in the nagative I have somebody like circuit in the bord but I do not know where it is that they can help me I have here some
     

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  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hi, and welcome...

    With this kind of issues at the 12v input, you need first to known why it's has been damaged.
    First thing is to measure the 12v circuit by ohms, a healthy 12v circuit should be something like this,

    [​IMG]

    When it's has issues, then these are the most caps which may cause this issue, see this picture..
    [​IMG]

    More about the 12v circuits, see this picture..
    [​IMG]


    If you have some issues with the U25/U26, then you could consider to repair it with new parts, or to modify it with a Dc to Dc converter module which is a cheaper and easier repair method than to buy the defective parts.
    See this DM800HD U23-U24-U25 1.2v supply replacement topic for more about this.
     
  3. tinoco

    tinoco Member

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    hello Johnny B sorry but my extrembox 800hd is in short circuit on all capacitors in the 12v will be that if i do as it is here, DM800HD U23-U24-U25 1.2v supply replacement will solve the problem.
    You can inform me what type of dc to convert I use because in EBAY there is a lot or it can be anyone, can I find it here in Europe or have to send it from china.
    If you find the dc to convert here in europe can inform me the site thank you.
    [​IMG]
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    You first need to solve the short circuit issue before you can fix the defective circuit.
    When you think it's caused due the U23/U25, in any case the 1.2v circuit dc delivery, and want to be sure it's caused by it, then the most logic thing to do is to remove the L41 inductor (coil).
    It's not so easy to remove, but can be done and needs also be removed when you want to modify this circuit to a Dc to Dc converter.
    Instead of removing the L41 coil, you can also remove the U25 and the ceramic caps C311/C312/C313/C314 for disable this circuit from the 12v circuit.
    All ceramic caps which are connected the 12v circuit may cause a short circuit when one of them has a short, as shows on the drawing, you need to remove one by one to find out the defective one.
    Best start is to start with the C311/C312/C313/C314 and the U25, because one of these are often the cause.
    Anyways, when removed, and the short circuit has been solved, then you could consider to modify it with the alternative Dc to Dc converter module.

    If it's not solved after the removal of the parts which may cause a short circuit onto the 12v circuit.
    Then it could be caused by the burned places, the 12v input area because these motherboards has more internal print track layers, and it could be that due the burned places, that it may make contact to a internal layer and so create a short circuit.

    Best way is to clean the burned places, and to check it with a good quality magnifier.

    As for the Dc to Dc converter, and ebay seller in Europe, just go to the Ebay site of your country and search to,
    LM2596S DC-DC Adjustable Step Down Voltage Regulator
    Order it from a seller from a Europe country as the UK, or Germany and find one that sell it cheap.
     
  5. tinoco

    tinoco Member

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    hello Johnny B I apologize for being annoying but bord of the dreambox when it burned the condenser C286 plus the L36 L36A L37 was not in curte circuit because I solved some new parts in the site and the dreambox started to work but after a little time the box began to disconnect By myself, until I continued to turn the dreambox on and off at one moment or another went into curte circuit.
    I've also been measuring the 10 capacitors that are at the back of the processor these are also in short circuit.
    Capacitors C12, C13, C14 are also in short circuit.
    Do you have any idea what parts I have to remove from the edge to make sure the curt circuit is in the 12v or not.
    The dreambox with the Dc to Dc converter module but working at 12v or 1.2v and the current input will be equal with the 12v goodbye charger and thanks for everything.
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I'm not sure which voltages are involved with these C12, C13, C14 caps, but often, when you also measure more caps which are shorted, and from another voltage circuit, then it could be caused due the cpu.

    As for the parts question, which are in contact between the ground and the 12v, and what needs to be removed to isolate these circuits from the 12v you can see on the drawing I gave named, Dm800hd P5, pin6 12v circuit information and the other image with the marked caps.

    It are mostly caps, that are connected between the 12v circuit and the ground, an defective Ic gives often not a full short circuit, often it still gives some ohms value, close to zero, a shorted ceramic cap could give it.

    If you have removed the caps, and still has the issue, then it could be a short circuit to a internal layer, most likely by the burned places.
     
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  7. tinoco

    tinoco Member

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    hello friend Johnny B thanks for all your help I was able to solve the problem with all the voltages with the LM2596S DC-DC in P5, but now I have another problem when I turn on the dreambox it works fine, when I send the box to restart the 2 lights of the net connect and the box stays so nothing appears on the display of the dreambox is always with the 2 lights of the net connected to the box does not restart.
    When I disconnect the charger from the box I have removed and put the plug of the charger several times in the connector of the box reconnect again.
    You have somebody Johnny edeia what could be doing this problem, thank you and goodbye.
     
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Maybe a power supply issue or has used a higher cap on the 1.3v circuit, or other voltage circuit.
    I think, first check the power supply, if it's has the 12v.

    As for the other (cap) idea, switch off the board, take a 12v lamp and unload the 1.3v circuit and see if it startup.
    Do the same with the other voltage circuit to see if the box reacts when a circuit is unloaded.
    When it does, then it has a unload issue of one of the circuits, maybe a disconnected or bad soldered cap.
     
  9. tinoco

    tinoco Member

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    hello friend Johnny B I have another problem with this damn box when I bought it on the internet was not informed that the tuners ALPS BSBE2-401A only worked in the SD channels I ended up changing the capacitors of the tuner all when it was put the tuner in the box now in the appears (Tuner A: EMPTY).
    I was measuring the correct inputs on the tuner slot input so everything is OK.
    I was measuring the output LNB I do not have 13v / 18 to feed it now I do not know if it is because the tuner not being detected by the box will be that you can help me.
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    It would be easier when you have another tuner which is suitable for this type box to find out if it's caused due the tuner, or from the motherboard.

    When you don't have a spare tuner then I'm whiling to send you one, just give me a PM if you like, see the contact button under the avatar when you logged in.