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Alexander Chemeris alexander.chemeris at gmail.comHi Andrey, On Fri, Nov 9, 2012 at 9:55 PM, Andrey Sviyazov <andreysviyaz at gmail.com> wrote: > I got two UmTRXv2 and both with the problems of inaccurate assembling. I wonder, do they do at least visual inspection of boards after assembly? This again reminds us that we have to create a test procedure for the fab before we start manufacturing in quantities. If you're a community member who could contribute to the test procedure - we would greatly appreciate that (mention on the web-site, t-shirt, even free hardware). I'm willing to try a simple semi-automated visual testing - make pictures of all boards and then subtract them from a reference one. If performed well, we should clearly see all errors on the resulting picture. The only question is how hard is it to "perform well". > 1st Thomas sent to me and 2nd was new and clear (say, virgin). > > Thomas said about power supply symptoms few days ago. > I fixed assembling error in DC/DC - power coil (L37) was 90 degrees rotated. > It was too big surprise for me, because I replaced all components around > coil before I saw that it soldered incorrect. > Anyhow,This board began to work, but LMS2 still didn't hears SPI and didn't > work. Do you think it's a result of bad soldering and rework might help? > Also I found that mashine lost one 0.1uF cap (C86-1) near LMS1, but it was > easily to fix. > LMS1 and all other parts, seems working fine. > > Second board programmed and working, but FPGA too hot and 3.3V loaded a lot. You think the FPGA itself is broken? > Seems, I have to find BGA reworking station to fix both boards finally. > Also needed new Spartan-6 FPGA for replace. > Alexander, do we have spare on hands? Nothing on hands. We should check with Andrew Karpenkov and his connections at InlineGroup - they should have a stock of those chips and a BGA reworking station. E.g. they repaired our blown SP-605. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru