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Re: [Paparazzi-devel] Re: Blown power supply?

From: Jesper Kempe
Subject: Re: [Paparazzi-devel] Re: Blown power supply?
Date: Tue, 14 Apr 2009 10:28:21 +0200


Too bad to hear about more people having trouble with this. At least I managed to fix the problem and it has not happened again.

I think the cause for the blown supply was that I had the +5V connection from the ESC still connected "back to" the Tiny. Now I have removed that cable and it works now...

To remove the module I used a small standard solder iron. The way I did it was to remove the small board of the module from its pins, leaving the quite big pins in the Tiny until the board was loose. Then I managed to heat the pins enough to get them out of the Tiny board.

Good luck!


2009/4/14 Jan Nowack <address@hidden>
Hi Jesper, hi all,
unfortunately we also have a blown power supply. And this happend on
our first flight :(.
Do you have any tips how to change, especially remove the
PTH08080WAH-Module from the tiny board? Do you have used any "special
equipment" for this?



2009/3/22 Jesper Kempe <address@hidden>:
> Hi again
> For information I can say that it looks like it was the power supply that
> was broken. I managed to remove it  from the Tiny board and when I hook up
> +5V to the output pin of the power supply module (pin 3 on the PTH08080WAH)
> the Tiny comes to life and the led starts to blink. I even got a GPS fix
> inside my workshop.
> Now I only need to get a new module and hope that it was a bad module that
> broke and that it has nothing to do with my autopilot.
> //Jesper
> 2009/3/22 Jesper Kempe <address@hidden>
>> Hi All
>> Yesterday I finally managed to fix my airplane after my last incident and
>> began to reinstall the Tiny.
>> When everything was connected and I had wrapped the board in some foam I
>> thought I should test everything before the final installation. I had
>> everything tested OK outside of the plane the day before. But this time when
>> I connected the battery a very bad sound was heard from the Tiny. It sounded
>> like a very bad short cut!
>> I immediately disconnected the battery and tried to see if anything was
>> burnt but I cannot find anything that looks broken. I tried one more time to
>> connect the battery but this time nothing happens. The thing is dead! :-(
>> After I while I decide to try to locate the fault. I think it looks now
>> like the power supply, the PTH08080WAH module, is broken. When there is
>> power connected to it it does not give me +5V on the output pin. I should be
>> able to just measure on the output pin against ground, right?
>> The question for you guys now is if it possible to change that module?
>> Of course it is possible but I mean more if you think it possible that the
>> rest of Tiny has survived and that the module is the only thing broken? Is
>> it worth a try?
>> Regards
>> Jesper
>> Sweden
>> Still on the ground...
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