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Dreambox DM600 Hardware problem, blown power to LNB

Posted on 2015-01-02
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Last Modified: 2015-01-09
Dreambox DM600 has blown power to LNB.
Can anyone help with schematic, service manual or parts to check?
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Question by:Tom
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10 Comments
 
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Expert Comment

by:gheist
ID: 40529352
Are you sure it is not cable in between?
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Author Comment

by:Tom
ID: 40529428
Yes I'm sure. No DC voltage on antenna connector on DM600
LNB was damaged and was drawing to much current, thereby blowing the DC regulator on DM600

Have seen similar failure on Dreambox DM500 and the problem was blown transistor on motherboard. Unfortunately the DM600 has not the same motherboard layout.
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Expert Comment

by:gheist
ID: 40529457
You can power the receiver head via aplitter (provided receive circut is not blown in the box)
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LVL 9

Author Comment

by:Tom
ID: 40529634
Yes you can, but the problem is that the DC voltage is used for polarization of  the LNB, and for power to the LNB. So a vertical channel will have a different voltage level than a horizontal channel.
So in theory you will need a switch with 2 voltage levels and each time you swap the channels on your remote
you must flip the switch depending if it is a horizontal or vertical channel you are watching :-)
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Expert Comment

by:gheist
ID: 40529660
Yes, or you buy a new dreambox instead.
I could not find any internal diagrams of new dreamboxes past DB400 :S
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LVL 9

Author Comment

by:Tom
ID: 40529684
With many years in the hardware field it will be hard to give this project up. :-)
And yes I have already a new DM800HD installed.
For sure the schematic is available somewhere as you have plenty Dreambox clones around.
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Assisted Solution

by:gheist
gheist earned 500 total points
ID: 40529936
For original dreambox you can ask dream multimedia on how to recover after short-circuiting inputs.
For clones - just dump it.
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Accepted Solution

by:
Tom earned 0 total points
ID: 40530437
Found the schematic. Turned out to be a blown LM358 on the tuner board. Receiver is working again.
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Expert Comment

by:gheist
ID: 40530609
you are the master.
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Author Closing Comment

by:Tom
ID: 40539845
Together we are unbeatable :-)
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