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I notice there is a problem of power on PIN 1 and PIN 2 of DIN connector of Roomba 521...I have only 0,5 V but it's expected 12V...motherboard damaged?

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    $\begingroup$ why are you assuming that the motherboard is damaged? ... check the battery $\endgroup$ – jsotola Jul 23 '19 at 2:32
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This normally happens when you don’t use both power pins together, in order to get full voltage both pins must terminate into 1 wire or trace.

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  • $\begingroup$ I used only PIN1 for 1 months with full 12V....you suggest to join PIN 1 and PIN2 in parallel? I have to do the same with ground PINs? $\endgroup$ – Daniele Velardi Jul 24 '19 at 15:10
  • $\begingroup$ Yes I had the same issues when first attempting to use the battery to power a micro, in the end I joined both power pins in parallel and both ground pins in parallel, now I get a stable voltage into the regulator at all times. $\endgroup$ – Pete Jul 25 '19 at 1:56
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I find right answer:

with connected broken buck converter I measured 0V, but removing broken buck converter all work fine and I can measure 12V.

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