<div dir="auto">I have the same issue on my SPARCClassic. I replaced the capacitors in the power supply and now the unit doesn’t power on. It’s pretty frustrating. It was working before I replaced them, but I wanted to be forward since they are known to fail. </div><div dir="auto"><br></div><div dir="auto">It’s been sitting in a box all this time since it stopped working, such a shame. Not really sure where to go with it. </div><div dir="auto"><br></div><div dir="auto">-Ian L. </div><div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Jun 6, 2025 at 09:14 Andrew Back via rescue <<a href="mailto:rescue@sunhelp.org">rescue@sunhelp.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">On 06/06/2025 13:42, Jan Liška via rescue wrote:<br>
> Hello,<br>
> <br>
> I’ve started recapping my IPCs using locally sourced low-ESR capacitors. <br>
> However, both PSUs I’ve recapped so far exhibit the same issue:<br>
> <br>
> They power on for a very brief moment (about 0.1 seconds), the 5V rail <br>
> voltage rises to 2–3V, and then the unit shuts down. I checked the units <br>
> for cold solder joints and significant corrosion damage on trails but <br>
> found none.<br>
<br>
This doesn't help, but just to add that I've experienced the very same <br>
problem and come across others who have also. Hence would be interested <br>
to hear if anyone gets to the bottom of what appears to be a common <br>
failure mode. Sadly my SMPS fault finding skills are pretty minimal.<br>
<br>
Andrew<br>
<br>
<br>
<br>
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</blockquote></div></div>