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 Posted: Sep 20, 2008 - 11:55 AM |
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Joined: Jun 06, 2008
Posts: 10
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One IC on my AVR Dragon is burnt-out, i think its the voltage regulator..
Its happened when the Dragon is connected to a target which is not powered up..
It is labeled BOR 6AW MJ7C and is in the middle of the 3 yellow Capacitors on the board.
I've googled it (BOR 6AW MJ7C), but nothin turn up.
Does anybody know the make of this IC?
Regards,
Jain |
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Posted: Sep 20, 2008 - 12:34 PM |
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Joined: Nov 01, 2005
Posts: 4907
Location: Hilversum - the Netherlands
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Posted: Sep 22, 2008 - 08:15 AM |
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Joined: Jul 08, 2007
Posts: 22
Location: Saint Petersburg
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jainvj wrote:
It is labeled BOR 6AW MJ7C and is in the middle of the 3 yellow Capacitors on the board.
Take a look at http://www.efo.ru/doc/Atmel/pdf/ATAVRDR ... _guide.pdf
The modification can be applied to PCBs A.0601.3.1000.C
Brief translation (in case you don't read Russian  ): there is a bug in voltage stabilization circuit design. In case of EMI chip TPS61020DRCRG4 marked with white restangle at the first picture burns out.
Damaged AVRDRAGON can be repaired without any functionality loss. To repair:
a) Remove burned IC TPS61020DRCRG4 from PCB completely.
b) Connect two PCB pads (shown at second picture) by wire.
Hope it helps. |
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Posted: Sep 26, 2008 - 12:00 PM |
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Joined: Jun 06, 2008
Posts: 10
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| thanks for the replies..i'll try that n come back.. |
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Posted: Oct 29, 2008 - 10:28 AM |
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Joined: Jun 06, 2008
Posts: 10
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I've tried the stpes suggested by evilimp.
The Dragon started working...
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Posted: Oct 29, 2008 - 12:08 PM |
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Joined: Jul 08, 2007
Posts: 22
Location: Saint Petersburg
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jainvj wrote:
I've tried the stpes suggested by evilimp.
The Dragon started working...
Congratulations !
Sometimes forbidden secret knowledge like this helps  |
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Posted: Feb 06, 2010 - 02:46 AM |
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Joined: Jul 18, 2007
Posts: 5
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Hi,
I performed the mods as described to try and resurect my dragon with some sucess.
Firstly the Dragon now powers and connects, but i get the infamous "Failed to enter programming mode" with multiple AVR's. I converted my buspirate to an STK500 to test these same chips and they are fully functional. Any suggestions?? or has my faithful dragon trully been slayed.
FYI ide been using this thing flat out for 2 years and a failing battery in my laptop killed the voltage reg... So im still happy with the product
Im using it directly from my (desktop) comp USB port. Voltage is at 5.01V
sorry to bump such an old thread but this sort of thing can save us students a fair bit of cash |
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