Dm7020Hdv2-Freezes All the Time

Discussion in 'Hardware troubles and Repair support.' started by bumperbee, Aug 29, 2020.

  1. bumperbee

    bumperbee Member

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    After searching, I found this “DM7020HDv2-OpenPLi 4.0 IPTV Japhar (March 2016)” dated 6th Apr 2016. Did you mean this version? Thank you
     
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  2. toysoft

    toysoft Well-Known Member Staff Member

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  3. bumperbee

    bumperbee Member

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    I just tried but it wouldn’t flash. So I tried out this version,”openpli-enigma2-4-dm7020hdv2.nfi”. Did the copying of .KO files but could not receive any channel.
     

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  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I assume that the channels scanning just works, thus it recognize the tuner(s) and is/are present.

    Then I think that you really need to check it in a log file.
    My advice, use a program as from a older windows systems, the Hyperterminal program, or a program as Putty, the serial option, and to connect a serial null modem (RS232) cable between the box, and a computer with a serial db9 port, or to use a db9 Rs232 to usb cable to see why it fails.

    The basic settings to make a connection to/from it are,
    Bits per sec .: 115200
    Data bits: 8
    Parity: none
    Stop bits: 1
    Flow control: none

    When using Hyperterminal, and to read it easier afterwards it better to store the log file directly to a hdd map/text file by going to above the transfer, and (I think) using the send text file option.

    In any case, to know why it not works, it should be seen in the (boot) log file.
    Or else, wait for a reply from Toysoft.
     
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  5. bumperbee

    bumperbee Member

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    Yes, I am able to scanned & received channels if the image is from Dreammultimedia, Newnigma, DreamElite, Hdf & Esi. Never done this before, I try it out. Thank you
     
  6. bumperbee

    bumperbee Member

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    Hi Johnny, I have fixed the Dm7020Hdv2 with the previous 3.5” 3Tb harddisk and the original Dream-multimedia Dvb-T2 dual tuner (not the original tuner for this box) and managed to get Putty to connect. Please help me see what is wrong with it? Thank you
     

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  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I've seen your log file which is actually incomplete but there is one thing (PrId : 0002a044 (Brcm4380) and searching to it with google then it seems to be happen more often, but unknown what it could be, but it looks as if it's related to a system crash and as far as I see it no solutions.

    However, what if you use only a normal regular tuner, does the box just works fine?
    If so, then still, in that case is the most logic thought that it must be related to the tuner drivers.
     
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  8. bumperbee

    bumperbee Member

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    I waited for another hour to see if there is any other recording when it freezes. But there is none, so I copied the result to a notepad and switch-off the electricity supply to the box. In this test, I did not fix any antenna to the Dvb-T2 tuner.

    For the past days I had tried many types of tuners configuration and also without any tuner and it still freezes. Dm7020Hdv2 has 2 slots for 2 tuners, original tuners are a Dvb-S & Dvb C/T. I think I had not try the original configuration of having slot A & B fix with Dvb-S & Dvb C/T respectively.

    There is one thing I did not inform is whenever I do any flashing through browser, it show there are some bad sectors. Could this be a reason to this?
     
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    A bad nand flash chip could be one of the reason why it freezes, but as also many other things, even the cpu.
    In any case, to exclude that you could use a image file which is less Mb's than another to see if it's caused due the nand chip.
    Often the older software use less storage space than the newer.
     
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  10. bumperbee

    bumperbee Member

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    If it’s the Nand flash or the Cpu that is causing the freezing, please tell me roughly how much will it cost and where can I buy it?
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    As for the cpu, which I thought it is the STB04500, searching with google to it, then it seems to be offered for a few dollars as you can see here but beware that it may scam or not be suitable for these receivers.
    As for the nand chip, I have no part number of it, thus I can not give some info about it, but I think you could find it under the 10 dollar.
     
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  12. bumperbee

    bumperbee Member

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    I did the Putty’s monitoring again and this time there are lots of recordings. I guess the earlier one is done incorrectly. Please help me see again. Thank You
     

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  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    By searching to,
    BUG: soft lockup - CPU#1 stuck for 22s! [enigma2.sh:7912]

    or to,
    Modules linked in: cdfs(O) isofs udf crc_itu_t autofs4 dreambox_keyboard(P)

    Then it seems to be related to e stressed cpu, to much tasks to do.
    Could be due the software, if it's a original box, use original software or oem.
    But still, it may also be caused due hardware, and since you already had tried different software, it think it's hardware related.

    But.., searching to,
    INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=7261282 jiffies)

    Then I'm thinking again of software, and thus basically.. I have no idea, same as others which handle with these issues with these receivers, starting somewhere in the year 2013.
    The only thing to figure it out is to replace some parts as the nand flash chip, memory chips and cpu to see when it's solves.
    But..., that's not so easy to do without the proper tools and solder skills.

    And also you could ask yourself if it all worth to spend the money and time to these (old) receivers.
     
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  14. bumperbee

    bumperbee Member

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    Hi Johnny, thank you again for the infos on sale of the components, detailed analysis and also the rightful advice. I had attached some photos on the components, could you help identify which is which please? Thank you
     

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  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    picture,
    1, No it a decoding chip.
    2 and 3, yes these are memory chips
    3, Indeed, this is the Nand flash chip, the K9K8G08U0D from Samsung.
    4, Correct, under the heat sink is the STB04500 processor.
     
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  16. bumperbee

    bumperbee Member

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    Thank you very much for the quick answers. Basing on your experience, please tell me which component do you think is the culprit? Just a guess, no commitment. Best Regards
     
  17. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah well, normally I would first replace the power supply to see if it makes some differences because a weak voltages, or amps may make the board unstable.
    And is also easy to replace, but only wise if you have a spare power supply because to buy a new one may be to expensive.

    If that didn't helped, I would replace the nand flash chip because these are not so hard to replace with a hot air station.
    But you still need to have some good solder tools and solder skills.

    The other two, memory chips and cpu are difficult to replace, both are equipped/soldered with solder balls and need some
    knowledge/skills and special tools to remove the old ones and solder new ones.
    I no longer do that with receivers if it has been used for several years, because the PCB solder points under the CPU are often damaged after removing the CPU, or often the PCB is no longer flat under the CPU, and so a new CPU will also do not work, or for a short period of use.
     
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  18. toysoft

    toysoft Well-Known Member Staff Member

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    I bet it could be a software / image / firmware issue, try to use an older software from few years before the one you used, to run on the box a more stable and old software that doesn't stress the box too much.

    TS
     
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  19. bumperbee

    bumperbee Member

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    Thank you Johnny & Toysoft

    @Johnny- Thank you for the detailed recommendations and advice.


    @toysoft- Thank you for your advice, I try out.


    Best Regards to All
     
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  20. bumperbee

    bumperbee Member

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    I had tried a few older image as follows,

    1. Dms- dated: 26.10.16- after reboot- all buttons on remote not working

    2. Merlin dated: 17.2.17- after reboot, freeze after sometime

    3. Oozoon dated:20.12.16-after reboot, keep freezing

    4. TS image dated: 19.6.16-after reboot, cannot bootup

    Is it because the boot-loader of the above old image is 88 and mine is 89?
    Thank you
     
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