Tuner or tunerslot issues,

Discussion in 'DM800HD Schematic drawings, Pcb images etc..' started by Johnny B., Jun 11, 2015.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    tunerslot-drawing-v5.jpg

    Tunerslot voltage measurements, with and without tuner.

    tunerslot-drawing-with-without-tuner.jpg


    Voltage overview from the HG001-01 Tuner connector.
    Similarly, a overview of the compounds as an example, pin A goes to pin A.
    See this image,
    HG001-01-Tuner-connector.jpg


    Tuner slot ohm/vdc measurements with destinations.
    Measurements where done between the ground and the measurement point, without tuner connected and all caps unloaded.

    Click on the image for a normal view.
    [​IMG]


    Tuner voltage or Ohm measurements, tuner connected, by Vcd completely started.
    BSBE2-401A and BSBE2-801A Ohm measurement data.

    dm800-tuner-modules-vdc-ohms.jpg

    TIP: Tuner issue
    Dreambox rebooting when trying to scan.
    Probably a wrong tuner version, try a different version such as rev. M.
    Problem, Dreambox 800hd reset / restart spontaneously during startup and or channel switching.
    Without a tuner, it will start normally, changing the tuner does not help.

    Other solutions such as the replacement of the U18, or the resistors / capacitors around the U18 will not help.
    Possible solution, place a 510 ohm resistor on top of the capacitor C276.
    In my case, this modification works perfectly on a Rev J board.
    Tested with a Rev J, K and M tuner.
    If you have a spare board you can find this resistor 511 at R212、R215, R235 or use a old trough holes 510 ohm resistor.

    dm8hd-u18-modification.jpg
    Problem.. After an update, the tuner is no longer present,
    Could be a wrong or corrupted image file without the correct drivers for the tuner.
    Upload the appropriate bootloader and software which is suitable for your sim card.
     
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  2. didier delaey

    didier delaey New Member

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  3. didier delaey

    didier delaey New Member

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    you have a nice picture from the back side of the tuner connector, do you have the same for the front side.
    or bether wher can we order such board?
    my old dreambox is using a 64pin connector tothe motherboard so i amnot able to plugin a new tuner
    best regards didier delaey
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I think you have the Dm800hd Estar which has another tuner slot than the other boxes.
    Dm800hd Estar.jpg

    Nevertheless the motherboard tuner slot pins are as far as I know the same as the motherboard drawing.
    And, if you have the Estar tuner, and thinking that it's not working.. be aware that you need to use the dm800hd estar imagefiles.
    Otherwise you may experience no tuner, or no signal issues.

    Question where can I order..
    Assuming you have plans to change the motherboard tuner slot, then you need a complete HG001-1-TUNER adapter.
    I do not think that it's somewhere for sale, better is to take one from a dm800hd parts board but I can not guarantee that it works because I never have rebuild a Estar tuner slot to a regular one.
     
  5. didier.delaey

    didier.delaey New Member

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    Yes you are 100% correct, thsi is my third dreambox, but the tuner is shorted on 5v bus inside the tuner. i stll can used it for IPTV without tuner, but you confirm it will be difficult tofound the tuner connector board and i don"t want tobuy another estar tuner but welle the normal one if i may found the daughter board. I paid it 35€ the price for the sim, but it will be bether to trash it instaed of loosing time to transform it, with also modification for cooling bloc ans back plane.
    I appreciate your answer didier delaey
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    An other option is, if you have a 5v issue in the tuner module on the tuner pcb, and are sure that the tuner pcb is fine, then you could consider to replace it from a regular dm800hd tuner.
    I have that done more often with the regular tuners, and a lomg time ago even made a connector on it for testing the tuner modules.
    Used two hhd/ide 2.5inch notebook motherboard female connectors for this job.
    It has saved me allot of time to figure out if a issue was on the tuner pcb, or the tuner module with tuner repairs.
    But still, this was in the time that the tuners were expensive, and the dm800hd very popular therefore worth to build.

    dm800hd-tunerSnap.jpg
     
  7. didier delaey

    didier delaey New Member

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    thank you a lot, do you know were i can found an estar tuner like your picture, preférence 801 type M
    I found on alibbaba several offers, but none withe the estar connector. who is selling the estar ?
    regards
    didier
     
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah finding a seller for the Estar tuner will be hard to find because as far as I know is the Estar factory closed a few years ago.
    In any case, I do not expect that you find a new Estar tuner, more likely if you find one it will be a used one or if you have luck an old stock tuner.

    Another option is to use the dm800hd/dm800se HG001-1-TUNER adapter, but it's not so easy to preform.
    Estar-tunerslot-adapter-Snap1.jpg
    Click on the image if you want to see the full size.

    In order to keep the cover you need it to remove the tuner connector and solder the regular tuner adapter on the motherboard which is not so easy to do and also a bit risky due the thin (internal layers) print tracks to the connections.
    But you can also no longer use the heat sink on the cpu, there is no place for and the back plate tuner holes will probably no longer fit.

    In any case, I have taken the time to test this idea by plug it into the tuner slot.
    Estar-tunerslot-adapter-Snap2.jpg
    Click on the image if you want to see the full size.


    Of course, the top cover will no longer fit in this way, but it's just a test to see if it works, and it does.
    Tested wit a Alps 401A, 801A tuner rev J.
    Estar-tunerslot-adapter-Snap3.jpg
    Click on the image if you want to see the full size.

    In any case, it's a bit of a solution for the dm800hd Estar boxes when the Estar tuner no longer works.
    But keep in mind that when using a rev M tuner or newer, the box could go in a reset loop.
    In that case it may help if you preform the 510 ohm resistor modification
     
  9. didier delaey

    didier delaey New Member

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    you are granted for your perfect documentation. The dreambox se is still in production, i hope i can find a manufacturere who can seel this board with the tuner, i may always try. for the machanic adjustment noproblem
    with amilling machine to remove 5mm of the cooling radiator.
    thanks a lot for you for the work, no doubt you are electronic engineer like me.
    if you lok with a microscope youwill see how terrible are the soldering without lood and incredible trace of flux between all the pin of the IC's, cannot remove with a brush and acetone.
    best regards I let you know i f I found something, didier
     
  10. oksol

    oksol New Member

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    Does anyone have a schematic diagram of tuner board.
    I have several boards faulty, but with a working tuner. I would like to fix it.
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Sorry, but as far as I known there is no schematic released of the tuners, not even one of the versions.
    I had only made a drawing with most of tracks for a revJ tuner, but never fully finished due the many tuner versions and difficulty to find all the internal tracks.
     
  12. oksol

    oksol New Member

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    In the process of repairing the tuner blocks, I had to draw the diagrams. I want to share with swamis fragments of schemes that may be useful. This is revision K.
     

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  13. oksol

    oksol New Member

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    A solution for tuner block with a “no signal” or “tuner empty” malfunction (one of the solutions).
     

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