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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    Hi Everyone, I hope I can request for help for my Dm7020Hdv2 at this section as I could not find a section on the same. Moreover a Master had informed me the Psu is the same with Dm8000, so I post it here, my apology if I am incorrect.

    My Dm7020Hdv2 is installed with a dual Dvb-T2/C tuner to receive Dvb-T2 transmission. Recently, not matter which image I used, without any operation such as downloading or Dvb-T2 recording or any other operation (in idle mode), it keep on freezing by itself after some time. I opened up and check internally, all capacitors seem to be fine, there is no leakages and it is not bloated. Could any Master, please tell me what is wrong with the box? Thank you
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hi, these are always tricky bugs to find/fix.
    Is it due to the PSU, an unstable voltage supply.
    Or is it a problem with the nand flash chip, the memory or cpu ..

    Some methods of trying to find these kinds of problems are ...
    1. Via the service (rs232) port, serial cable, and a computer with a serial program as a putty to see if a message appears when it freezes.
    2. Test whether this only occurs when using (satellite) reception, SD and HD channels.
    And whether it also happens when playing a media / video file.
    Then it could be related to the tuner(s).
    3. Test whether it occurs less often when a fan blows to the CPU.
    Then it could be a bad cpu, or stressed due bad software or related to it.
    4. Does the box remains stable when everything what can be removed/disconnected from the motherboard such as tuner's (if removable) and hdd etc.
    Than it could be related to the psu.

    In any case, this are a few things you could do to trying to find out why it happens, but sometimes it's just not to find, or/and sometimes it may be solved after it has a re-cap job.
    But even that is not always the case.
     
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  3. bumperbee

    bumperbee Member

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    Hi Johnny B, thank you for the awesome detailed troubleshooting methods. I will try them out. Best Regards
     
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  4. bumperbee

    bumperbee Member

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    Hi Johnny B, I did some tests and the results are as follows,

    Day 1:

    1. Switch off both tuner

    2. No freeze during the whole day

    3. Switch off electricity to box

    Day 2:

    1. Switch on tuner A only

    2. Set 2 recording timers , work without freezing

    3. Freeze after 8 hours

    4. Switch off electricity to box

    Day 3:

    1. Switch on tuner B only

    2. Set 2 recording timers, work without freezing

    3. Freeze after 7.5 hours

    4. Switch off electricity to box

    Does this means it is the tuner that is causing the freezing of the box? (attached photos of box & Dual Dvb-C&T2, model: Si21692 / in image under tuner configuration the display model is Si2169c)

    Some time ago, I had seen some Youtube channels that they soldered capacitor to the tuner and it work again. Please teach me what value of capacitor or component to add in to make it work again? Thank you
     

    Attached Files:

  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    First of all, all looks pretty clean and shine, as if it's nearly a new receiver.
    But, I have not the impression that it could be caused due the tuners because you say that both gives the same issue.

    What they do have in common in your test is the use of recording to a 3.5-inch drive and these use the 12vDc and 5vDc circuit which is actually not recommended because the 12vDc circuit is also used by the tuners and other sections, and also because these 3.5-inch hdd drives requires a fairly high amps consumption.
    More advisable would be to use a 2.5-inch drive which are used for laptops, or better a ssd drive or recording to a usb stick.
    Because these uses less Amps consumption and also use only the 5v voltage delivery.

    In any case, what I would do to see if it's caused due the 3.5 inch drive, than I would disconnect it and use a usb stick, or a 2.5-inch drive, or I would test it just without any of it, and let it play on a hdd channel.
    When it keeps working, then I would consider no longer to use the 3.5-inch drive, but to use another way to use for recording.
     
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  6. bumperbee

    bumperbee Member

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    Thank you very much Johnny B. Would it be better if I do not connect any harddisk to the box but do a mount to a NAS and let all recordings go to it?
     
  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    That's also a option, main thing with this test is to see if it helps when it use less amps consumption, which may be to high by using a 3.5-inch drive.
     
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  8. bumperbee

    bumperbee Member

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    Thank you Master, I try it out
     
  9. bumperbee

    bumperbee Member

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    Hi Master Johnny, please let me know your opinion on the below results,

    Day 4:

    1. Remain dual Dvb-T2 tuner in box and remove 2nd tuner which is not in use

    2. Remove 5Tb 3.5inch harddisk

    3. Switch-on box

    4. Restarted by itself about 7.5 hours later. Not sure if it freezes first than restart by itself.

    5. Switch off electricity to box

    Thank you
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    With this given information I have no idea why the box resets after a 7/8 hours.
    Maybe there is something to see in the crash log file, by doing a ftp connection to the box.
    But I'm not sure were the location is, it could be into the home/root/logs
    When there is no crash log, then it needs to be enabled, somewhere in the menu settings, the system log.

    The precise location, or settings to enable it depends on the type software you use.
    And there is also a wiki page about the crash log files access and more about other issues.

    If I think about it further, since it happens between 7 to 8 hours of use, it also can't be caused by the box itself, but something in the environment, thinking of another device on the same network, or another device on the power network.

    Nevertheless, you may be able to see it in the crash log.
     
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  11. bumperbee

    bumperbee Member

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    Thank you for the advice. Sadly, before I got a chance to read your message, I when to change the image to Newnigma, I guess the log must have been wipe out. I am doing another test now and see how is the result.
     
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  12. toysoft

    toysoft Well-Known Member Staff Member

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    Try to use an OpenPLi image, and see if you have the same issues, I know that on the DMM images there is the option for the box to go in standbye after some hours (this is set during installation).

    TS
     
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  13. toysoft

    toysoft Well-Known Member Staff Member

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    The Box is H264... does you have DVB-T2 in H264 or H265 ? If it's H265 the DVB-T2 tuner will have no real use. so you could remove it and keep only 1 tuner to see if the box freezes or not (and Check the Consumption of the HDD, it's generally written on it, if its 750mAmp or 1Amp, change HDD, it should be 600mAmp or lower.

    TS
     
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  14. bumperbee

    bumperbee Member

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    Hi Toysoft, thank you for the advice. But sadly OpenPLi or OpenAtv images does not work with Dvb-T2 Dual tuner. I guess it does not have the proper driver in the image, even though this dual tuner is an original from Dreammultimedia but not the original tuner for Dm7020Hdv2.
     
  15. toysoft

    toysoft Well-Known Member Staff Member

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    Then just replace the drivers in the extra folder with the one that work with the DVB-T2 that you know that works, and the images will work. It's only question of the driver.

    TS

     
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  16. bumperbee

    bumperbee Member

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    Hi Toysoft, I do not know where to find this driver. This driver I was talking about came together with the image, successfully receiving channels by doing an automatic scan after flashing will know the image is good and had included this driver. Please teach me how to find this driver to install? Thank you
     
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  17. toysoft

    toysoft Well-Known Member Staff Member

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    I don't have your box, but for example on the DM800HDse V1, the link where there is the drivers files (.ko), is below,

    /lib/modules/3.2-dm800se/extra

    Code:
    root@dm800se:/lib/modules/3.2-dm800se/extra# ls
    LICENSE               cu1216mk3.ko          lnb_ctrl.ko
    alps_bsbe1.ko         cxd1981.ko            si2166b.ko
    alps_bsbe1_c01a.ko    dreambox_keyboard.ko  si2169c.ko
    alps_bsbe2.ko         dreambox_rc2.ko       stb-core.ko
    bcm4506.ko            helper.ko             tmp100.ko
    bcm7405.ko            lcd.ko                tu1216.ko
    
    So you can deduct yours, take all the .ko files from that folder on the image supporting the DVB-T2 and copy them on the openpli/openatv same folder... then reboot the box and your box should now support the same tuners as the other image, as it's only question of the driver's in the image.

    TS
     
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  18. bumperbee

    bumperbee Member

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    Thank you Toysoft, I try
     
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  19. bumperbee

    bumperbee Member

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    Hi Toysoft, thank you for the instruction. I did as told on image,”openvision-enigma2-develop-english-9.3-r98-dm7020hdv2_nfi” and could receive the channels initially. But after the box restarted, it could not receive any reception. I did the copying of .KO files again but wouldn’t work anymore. I did not succeed on the following images too,

    1. openpli-enigma2-pli-extras-dm7020hdv2_nfi

    2. openatv-6.4-dm7020hdv2-20191020.nfi – could not boot-up

    Please advice
     
  20. toysoft

    toysoft Well-Known Member Staff Member

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    Try the Japhar OpenPLi for DM7020HD,

    TS
     
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