DM500HD Ferrari dropped and now stuck on green led

Discussion in 'Hardware troubles and Repair support.' started by uncinogb, Oct 9, 2017.

  1. uncinogb

    uncinogb New Member

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    I dropped my DM500HD and it is now stuck on the ferrari logo and green led. I had a look inside but cannot see anything disconnected or broken. The box still has an ip address, but cannot telnet or ftp it.
    Any idea which component might have failed in the drop?
    By the way this is a great board and your help is much appreciated.
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hmm could be allot of parts, I think check the voltages on these pins.
    Or check the coils L1100/L1116 (1R5) if one of them is broken, or check the metal caps if they still are connected.
    What also may help, compare these parts and print side pictures with your board, maybe there is a part fallen off of it.

    Click on the picture for a full view.

    Parts side..
    dm500hd-dreambox-china-partsside.jpg

    Print side..
    dm500hd-dreambox-china-printside.jpg
     
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  3. uncinogb

    uncinogb New Member

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    Many thanks. I'll have another look more thouroughly. In the meantime I have logged the boot log with putty which might give you a clue. The bit I don't like is "read invalid MAC address ff:ff:ff:ff:ff:ff from flash". Is this meaningful or normal during the booting process? The booting process stops at the last line "Kernel command line: root=/dev/mtdblock3 rootfstype=jffs2 rw console=ttyS0,115200" as per atached dump.
     

    Attached Files:

  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I think, goto the Ferrari advanced setup and reset all setting to factory default.
    Use putty as you did before, and hold/push the front pust button, switch the box on,
    If all goes well you should see the Ferrari advanced setup screen in putty, check these settings, or go to the Exit tab and Reset to factory default.
    See if the box starts further.
    bios-snap.jpg

    If not, see if you are be able to flash the box.
    You can use these zip file, Dm500hd-ferrari-software
    It includes,
    FerrariFiller_1_3_3_7F
    Ferrari_DM500HDSSL87F.nfi
    Ferrari-SSL87F-openpli-2.1-dm500hd-20120919-yang.nfi

    It's old, but good enough for testing the Ferrari sim card box.
     
  5. uncinogb

    uncinogb New Member

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    Thanks for that. Before I got your suggestions I had already checked the various voaltages as per your drawings:
    Fault finder pinout all ok, but slightly out
    P1100 pin3, all ok
    P1100 pin2, pins on chips ok
    EPROM U702 A9 1mV, A7 2mV, Q0 2mV A1 1mv A0 3V ecc, mostly out but some ok.
    I also tried to reflash using winxp after settiong the bios to factory defaults. Trying to flash the .inf image but Ferrari Dreamup hangs on "calculating checksum". Trying to flash the SSL it pretends to load it to the box and I got:
    Calculating checksum
    uloading to the box
    Box is flashing from memory
    and it hang there for over 20 minutes, then I gave up.
    Please note I could never flash via the browser as the box never showed an ip address (I used an ip scanner to make sure).
    From the voltage tests it seems to me the EPROM is the cause of the problems, but how can an eprom become faulty just by dropping the box? Could the voltages shown on the eprom be caused by some other component?
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    When falling, Eeprom theoretically it should not harm it and the measurements may be different due the state of the booting.
    In any case, most of the Eeprom voltage or ohm measurements are mainly related to the cpu connections.

    The only part which may be sensitive when it's falling could be the crystal, but since you get a readable (putty) output it seems to me not the case but rather thinking of somewhere a fallen off smd resistor and assume it had fall on the floor at the bottom, thinking of the print side.
    However, it may just as well be a broken print track, internal or external.
    It depends I think, how it's has fallen, flat, on the side etc.

    In any case, It's impossible to say what it should be, it could be everything, even the cpu.
    My best advice I could give is compare the parts with the images I gave, look at the smd parts around the Eeprom as the 0 Ohm resistors if they still are there.
    Same as the nand flash chip smd parts, suppose that the R735 zero Ohm resistor is missing, then the chip may become read only.
     
  7. uncinogb

    uncinogb New Member

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    I'll get myself a magnifying lense and have a good look when I come back next week. In the meantime it just occurred to me that it might be quicker for you to fix it. I gather you do repairs and I can see you are in Holland. How much do you charge and is postage to France from Holland reasonable?
     
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I can only say how much the sending back from the Netherlands may cost and it's between the 14/18 euro's.
    Further it depends on the weight, sending only the motherboard may be cheaper than the whole box.
    But, I can not guarantee that I can fix it, it depends on what it is.

    Personally I would not spend money for repairing a dm500hd clone motherboard with the nowlidge that a original motherboard dm500hd can be found on ebay for under the 100 euro.
    However when I must make a choice, I would buy a dm520hd, or the dm525hd instead of the dm500hd.
     
  9. uncinogb

    uncinogb New Member

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    I couldn't agree more. I already have a dm520 and my dm500hd was only for playing so no great loss but i like a challenge and might persevere to try to fix it with your help. By the way a great thank you again.
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Ah, okay but compare the motherboard with my pictures, there is a good chance that a smd part is missing due the fall.