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Re: [Paparazzi-devel] "PTH_08080W" Strange behaviour on YAPA2

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] "PTH_08080W" Strange behaviour on YAPA2
Date: Tue, 11 Sep 2012 00:23:37 +0200

After a lot of vibrations we have often seen the yellow tantalum capacitors break, sometimes causing such a behavour. But there is also an enable pin on the pth08080 module. The datasheet says to keep it floating but we have seen that touching it or excessive dirt on the board can cause the enable to turn off the pth08080. Otherwise the module might simply be broken. Any time you approach your board with your hand you might be causing electro static discharges ESD that in theory can distroy IC's. No opensource autopilot protects against this. 


On Tue, Sep 11, 2012 at 12:04 AM, limaiem imed <address@hidden> wrote:
Hi all,

After one year from using YAPA2 board I am experimenting some strange behaviour for powering my boards. Well I am basically powering the boards with 3S LIPO and all work fine for hours and hours. Since few weeks I remarked that my board takes longer time to get the clock led flashing (between 10 to 60 seconds).

when I measure the voltage between the Ground and the +5VCC output of the PTH_08080W just after powering the board I get 2.5 Volts and not 5V. seconds later (between 10 to 60s) the power jumps to 5V and the led starts flashing and all works fine the AP is working fine ...

Someone have a rational explanation for this ? it is a dead capacitor that is leading to this (one between C37 to C40) ? Are there any risk to get the board powered off during the flight ?

Thank your for your help !


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