freeze dm7025+

Discussion in 'Other satellite receivers.' started by fabio, Dec 24, 2017.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I'm starting to think that you have a receive issue with your rs232 serial chip from the box, or the computer side send part.
    If you can, see if you can take another computer for this job.
    When that not succeed, then it could be the box side, the receive part of the rs232 ic.
    The transmit side works, otherwise you have no terminal output.
     
  2. fabio

    fabio Member

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    I have also tried on two other PCs with different operating systems and the problem is always the same.
    or the serial chip of the decoder has started or there is not enough power in the decoder to redo the flash or the firmware that I loaded it does not allow to reinsert one and we should use some reset procedure that I do not know
     
  3. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Nah most common is a defective rs232 chip which can happen on all the dream/vu boxes.
    You need to replace it for a new one to know it for sure, but I don't know the location on the dm7025, it may have placed on a module, or else on the parts, or print side.

    However the Rs232 chip looks something as this...
    rs232-port-issues dm800
    or from a dm8000hd like this chip which has less legs..
    dm8000hd-rs23-serialport-chip-replacement-jpg
     
  4. fabio

    fabio Member

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    found it is the icl3241cbz
     
  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    That is not an easy ic to replace, so also slightly more expensive as a Maxim, or St serial chip.
    But it is the chip for the Rs232 serial port and the communication for the sim card.
    It is quite possible that you have a problem with it.

    dm7025-rs232-ICL3241.jpg
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    But maybe... Try this trick.
    Use dreamup, serial and network enabled and connect the box on the regulair way and turn on the box until you at least see that it say's the type box.

    Leave dreamup as it is and use the given box ip, see if you are be able to make a connection to the box by browser or telnet.

    If you can't access it with a browser, but you can access it with telnet than try this into telnet to activathe the browser option.

    Telnet when you logged in...
    Type the following commands (after each line ENTER)
    mount /boot -o remount,rw

    rm /boot/*

    reboot

    And check if you are be able to access it by browser but the ip may change, however if all goes fine you should be able to see it in the front display.
     
  7. fabio

    fabio Member

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    eh yes it is not easy to replace but do you think there is something compatible?
    tried the procedure (thank you) but nothing to do
     
    Last edited: Dec 31, 2017
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Pity, because I really thought that it may have a chance.
    But okay in that case it may help if you replace the rs232 chip and better is to replace it for the same chip, you can find them for example on ebay.
     
  9. fabio

    fabio Member

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    But I do not think it is the rs232. I saw on the net an explanation for a dm500 that does not turn on the display (even if it is not a real display) and this procedure is called Jtag you know nothing?
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    All dream boxes has the ability to create a jtag (I2C) connection, if you have a cypress board.
    But I do not know someone which has succeeded to fix the boot loader by this method.
    Only most of the vu boxes can and has succeeded by this method.

    But what does your front display say, nothing, or something.
    And does it react with the front push button method.
     
  11. fabio

    fabio Member

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    The display is turned off so you can not even create a network connection
     
  12. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    In that case, check the power supply voltages, just in case if there is something wrong.

    1 +14v
    2 Ground
    3 +6v8
    4 power on
    5 +12v
    6 +12v
    7 Ground
    8 +5v
    9 Ground
    10 +3v3
    11 Ground
    12 +2v5
    13 +2v5
    14 Ground
     
  13. fabio

    fabio Member

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    thank you very much you are always very kind
    does the connector mean the one on the motherboard where the processor is?
    the numbering goes from left to right or opposite?
     
  14. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    It's the power supply cable/connector to the motherboard.
    You can measure it from the power supply side or the motherboard side, the sequence is the same and similar as the dm8000hd.

    For example, this is the motherboard power supply connector side from a dm8000hd.
    dm8000hd-3v.jpg
     
  15. fabio

    fabio Member

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    only the pins 12 and 13 do not reach the correct voltage indicated in the diagram of dm7025
    not having a scheme is problematic. I verified through the tester that the transistor 18p06p is the one that gives continuity to those two pins but I would not even be the capacitors

    the electric plate from as model etxez654m7f
     
    Last edited: Jan 2, 2018
  16. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I have here a measurements overview from this power supply which is also used with the dm8000hd
    If it's related to the 2.5v, then it could be indeed a issue with the Q400 but that depend if it has the 10v to it.
    Note that when you test the psu while it's connected to the motherboard, then this voltage could also drop due a issue from the motherboard.
    Better is to test it when it's not connected to the motherboard, but for that you need to create a 3v.
    More about this see here, which is done with a dc to dc converter, but you could also use some battery's.
     
  17. toysoft

    toysoft Well-Known Member Staff Member

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    I have 3 x DM7025 boxes here, none of the boxes have a sim card inside.

    Try to run your box without sim card to see if this changes something, and if you want, you can send me your sim for test and then I will send you it back confirming it works or not.

    TS
     
  18. fabio

    fabio Member

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    Thanks toysoft
    Look I do not know what to tell you because on the box there is just written dm7025. Now if I remember correctly on the other box that I had and I sold it also seems to me that there was no sim card.
    I tried to remove it but it does not change anything is just the boot sector gone and I know that the decoder is just to be thrown away
     
  19. toysoft

    toysoft Well-Known Member Staff Member

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    Send me the sim, and email me directly to my email address (will PM you it), then I can check with you step my step and even thru Teamviewer.

    I will check the sim as well, if you can send me it, and return you it. Then we can do what we have to, as I think that the images you use are for DM7025. Did you tried my image ? DE-OpenBlackHole 1.4 ?

    Check here : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=110&page=1

    I personally don't think the box is good to be thrown away, we will chat by email and go further. Once we will know we will publish here the solution to fix it that we found.

    TS
     
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  20. fabio

    fabio Member

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    toysoft you're always very kind but the problem in my opinion is not so much the firmware itself as the way to load it
    if I take dreamup or similar programs set the door as I then connect connect the receiver this is recognized in the logs as dm7025 but remains the writing: connection prepared, now switch on the dreambox and the flash button does not enable therefore the decoder does not from the unlock to pass a sign this because the boot sector is disastrous probably with a jtag perhaps the thing is resolved. I have seen some procedures but not for the dm7025