ps dm 800hd se Rev 9 dead

Discussion in 'Hardware troubles and Repair support.' started by kdog, Jun 13, 2019.

  1. kdog

    kdog New Member

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    hi all,

    At my place a few days ago i was having a problem with electric power (Lightning/thunder), and some electronics from my house are dead(i want to repair myself some, some with guarantee), anyway, i have a dm 800 hd se(clone) with led's from lan and led from tuner ON, but the receiver not start and showing nothing on display.
    Voltages are:

    7: 0v
    6: 0v
    5: 4.93v
    4: 3.26v
    3: 1.25v
    2: 1.81v
    1: 0.57v

    Thank you
    regards
     

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  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Seems to me a Estar box, more about this, see here.
    3: 1.25v should be 2.5v which is delivered from the Ic1 dc to dc chip.
    1: 0.57v should be 1.2v which is delivered from the U1103.

    By removing the zero ohm resistors R1134 R1138 from the U1103 circuit you should be able to isolate this voltages from the cpu, and when removed you should measure the 1.2v, if not, then the U1103 ic has damaged and needs to be replaced.
    If you have the 1.2v after removing the zero ohm resistors, then you have most likely a damaged cpu.

    As for the 2.5v which is delivered from the Ic1, at this moment I have no info about the output resistor or inductor to isolate this voltage from the cpu.
    Maybe later more about this.
    However, since both voltages are for the cpu, then the chances are that the cpu has been damaged.
     
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  3. kdog

    kdog New Member

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    hi,
    thank you for the quick info, i will come back with the news!

    regards
     
  4. kdog

    kdog New Member

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    hi again
    i got another dm800hd se but this have a8p sim and i can't fix it... "BIOS NO CA FOUND"... it show on display sim 2, but 100% i have a8p, i checked.
    https://imge.to/i/juEIx
    https://imge.to/i/juFf1

    what should i do?
    thank you
    regards
     
  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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  6. kdog

    kdog New Member

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    okey johnny, i can take it from the old e-star dm800hdse and replace them, but one question, why with japhar flasher v1.1 i can flash .nfi file but still no ca found(only with japhar flasher, i have the flash button to use).
    https://imge.to/i/j0ATr

    with what software i can re-upload the genuine bootloader for a8p ?
    regards
     
  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    flash button shows, or not..
    This can happen due the type uploader tool you use, there are even xtra addons/tools to activate the flash button.
    Nevertheless, when a flash button not become active then you may assume that there is something wrong.
    It often happens when a sim card failed, or by using newer system software as w7.

    You could search to dm800se a8p images, but basicly an a8p sim is genuine, thus you should/could use the normal bootloaders and software.

    However not always, when the box is a clone, and previous used with another type simcard as ferrari or other older sims, then you must install the bootloader from the simcard of which the box has been sold, but also with the simcard it were sold.
    Only after it works, then you can preform the change to another sim.
    This is figured out from my experiences, and could also be the issue in your case.
    But still, it does not have to be, because there are many things which may cause this issue.

    In any case, when using a wxp system and dreamup with the usb service port and network connected, it should normally good enough to get a good result, but in some cases may also the use of optiflasher bootloader fix helps.
     
  8. kdog

    kdog New Member

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    With flash button pressed, and then power "lan network cable is active", nothing happen.
    if i put the jumper https://imge.to/i/j025R i got on display when i start "SIM 2 and 84 in the corner", but i have a8p inside...

    p.s. i just want to write a new bootloader but i can't :(,
    if flash any image i want in http browser still "no ca found" and not responding on "REBOOT" button from browser.
     
    Last edited: Jul 1, 2019
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    The No Ca found issue is often not related to the boot loader, but the image file it has which is not suitable for the sim card it has.
    Nevertheless, with optiflasher connected with the service port and network, and the bootloader fix is in most cases enough to fix this issue.
    When not, then it could be due a defective sim card, not fully defect as if it's no longer present in the sim card slot because then you should ger the Error in the oled screen, but just defective.
    In some cases to measure, by measuring the 5v pin, pin 1.
    When it collapse, then it may caused due the sim card.


    The No Ca found issue and when you receive garbage into a terminal as Putty or wxp Hyperterminal or other Rs232 serial tool.
    Check the inductor L800 not interrupted, and if the crystal Y800 still works.
    The inductor can be measured by ohms, just as if it is a fuse.
    The Crystal is more complicated to measure, a scope is basically needed.
    Better is to just replace it for another one which cost less time than to measure it.
     
  10. kdog

    kdog New Member

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    hi JB,

    Thank you for everything, all that you gave me. I succeed, first i Check it the inductor L800 and then i replace it the crystal L800, still "no ca found" error, and then i replace it the Q1603 crystal, and Done, it works now, no more "no ca found", it works super.

    thank you very much, you are the best!
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Ah yes totally forgotten the Q1603 crystal, which is for the sim card, glad you have found it, well done. :)
     
  12. kdog

    kdog New Member

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    hi JB

    i came back with the the Estar box with both zero ohm resistors R1134 R1138 removed, and i have now:

    3: 2.57v (PIN7(gnd) with PIN3)
    1: 1.25v (PIN7(gnd) with PIN1)

    what do you say?... i think the CPU dead
     
    Last edited: Jul 18, 2019
  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    The pin 1 voltages is only used for the voltage delivery to the cpu,
    The other voltage is also for the cpu, and for the network.
    Because both collapse, then the most logic reason why it happens is because the cpu has become damaged, probably caused due an lightning strike trough the network.

    So, yes.. sorry to say but based on the info, I think that the cpu has been damaged.
     
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  14. kdog

    kdog New Member

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    hi,
    i have another question JB. Can i install/soldering the wifi module from the "dead DM 800hd se" to a "DM 800hd pvr"?
    It's there any chance to do that?

    https://ibb.co/Yj1rWwf
    https://ibb.co/vq76q0D
    regards
    thank you
     
  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    There is no Usb four pins connector in an dm800hd, thus to solder it the same as a dm800se is not possible, but you can solder a usb connector on the wifi module and plug it into a usb port.
     
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