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Thread: DM500s Fault / Dead ?

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    Default DM500s Fault / Dead ?

    Hello, can anybody help me with this? I have two DM500s, they were both working fine up until a few days ago, and both were in diffrent locations.

    The problem I have is that they do not turn on, when the power supply is plugged in the green LED lights up, it can not be turned off and on via the remote. I have used dreamUP with a null modem cable and have erased, erased, erased, then reflashed with the original dm500s img but still will not come to life. I have erased x 5, them flash x3 but still nothing.

    Any ideas? thanks again for reading

    Cheers Yobbo



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    Junior Member CVLAIS's Avatar
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    i have a dm500 doing exactly the same thing, it loads to the Gemini startup screen and just stays there doing nothing. I also have tried reflashing and erasing but not luck.

    If anyone has any idear what to do let us know

    Thanks
    CVLAIS

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    hmm something simular happen to me aswell (twice actually)
    I rebooted and the box didn't turn back on!

    im running Gemini

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    Senior Member z80's Avatar
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    Have seen this a few times, and managed to get around it, though there are different issues here with the two problems.

    The instructions I was given by the manufacturer was to reflash with the factory image from the clone maker, not the old dream image, it uses a different tuner.
    Of course you have....earthed the LNB haven't you guys ????

    I will post the factory image for your clones (?) when they get the site attachment sizes sorted out on this site.

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    z80 do you have to earth the new dm500s we are buying now
    from here say in the last month or two???

    cheers
    When you do things right, people won't be sure that you have done anything at all

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    Senior Member z80's Avatar
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    Quote Originally Posted by best4less View Post
    z80 do you have to earth the new dm500s we are buying now
    from here say in the last month or two???

    cheers

    Yep..........

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    Bugger, do i just do a Google for it or is it
    something straight forward

    cheers
    When you do things right, people won't be sure that you have done anything at all

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    Loop a earth from a gpo to your wall socket connector (behind the plate).

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    Now be nice what is a gpo
    last time i heard it was the post office
    When you do things right, people won't be sure that you have done anything at all

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    General purpose outlet = Power Point. Sorry

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    Quote Originally Posted by BillyGoat View Post
    General purpose outlet = Power Point. Sorry
    And for properties with no earth in their power system, what do you recommend?

    You will find the original image for the new tuners here

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    Senior Member z80's Avatar
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    Quote Originally Posted by jonc View Post
    And for properties with no earth in their power system, what do you recommend?
    I would earth the lnb to a metallic object such as a water pipe or a stake in the ground.

    If that is not an option then I would face Mecca and pray for good luck.

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    Quote Originally Posted by z80 View Post
    I would earth the lnb to a metallic object such as a water pipe or a stake in the ground.

    If that is not an option then I would face Mecca and pray for good luck.

    What is the technical reason for earthing the box and disconnecting the lnb?

    Leroy

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    Hello, thanks for your replies, yes I have earthed to a gpo, these two 500s are clones and I do not have the original manufactures img file, I have flashed the with the genuine dm500s img and gemini and still nothing. These boxes are 12 months old and died while in use, I have been trying to flash them to get them up and going again. cheers Yobbo

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    Senior Member z80's Avatar
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    Quote Originally Posted by LeroyPatrol View Post
    What is the technical reason for earthing the box and disconnecting the lnb?

    Leroy
    Noone really knows, we suspect it's a spike or static discharge path etc.

    But if you do it you have less problems than if you don't.

    Bear in mind that the TV may be live chassis, the sound system may also be at another potential and the common earth is via the RCA video/audio leads and the lnb cable to maybe a disceq switch on a tin roof....the possibilities are endless. a tin roof unearthed can make a decent stray voltage.

    The result is the flash ram and the tuner circuits stuff up.
    If you are lucky it will be a simple reflash, if not then some components are stuffed in say...the tuner or LNB drive section.

    In previous threads there was a fix for a transistor q571?
    On the main pcb near the rear of the IR sensor of the box is where it all seems to fall apart when the tuner won't lock.
    Other times the psu regulator gets zapped.

    Surely we've all had the zap when handling some LNB cables at one time or another? Imagine what that does to the Dream motherboard....

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    Default dead dm500

    yobbo,

    I once had a similar problem and traced it to a faulty plug pack, it was low in voltage, apparently it had enough voltage to turn the led on but would not do anything else, a new plugpack solved the problem.

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    Senior Member z80's Avatar
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    yeah..the plugpacks are a bit marginal for our Aussie voltage of 240v.

    Had one blow the cartride fuse on building point of entry....brand new, straight out of the box too.

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    I can verify these spikes stuff up your boxes.
    Only a few weeks ago I plugged my DM500 in while the tv was on.
    No earth on this one even after all the advice (yes I'm a dickhead).
    I saw a spike fly accross as soon as I plugged the first rca plug in.
    Box is dead now. Won't light up and won't answer to serial connection.
    Moral of the story, don't play with boxes if you've had a few to drink and suffer from the "she'll be right" attitude.
    z80 do you have an electronic diagram for these boxes?
    It's a shame these boxes aren't jtag-able.

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    Senior Member z80's Avatar
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    Quote Originally Posted by weirdo View Post
    I can verify these spikes stuff up your boxes.
    Only a few weeks ago I plugged my DM500 in while the tv was on.
    No earth on this one even after all the advice (yes I'm a dickhead).
    I saw a spike fly accross as soon as I plugged the first rca plug in.
    Box is dead now. Won't light up and won't answer to serial connection.
    Moral of the story, don't play with boxes if you've had a few to drink and suffer from the "she'll be right" attitude.
    z80 do you have an electronic diagram for these boxes?
    It's a shame these boxes aren't jtag-able.

    There are heaps of zero ohm surface mount resistors on the board.
    If you're really lucky it will be one of them.

    You can j-tag, but not with me..others claim to do it, but they haven't re-registered yet.
    Try Nokia Rules at sat-industry, he's a clever man

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    Quote Originally Posted by Yobbo View Post
    I have been trying to flash them to get them up and going again. cheers Yobbo
    Did you try the original Enigma image above I suggested on this link ?

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