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Andrey Sviyazov andreysviyaz at gmail.comHi Alexander. 2012/11/10 Alexander Chemeris <alexander.chemeris at gmail.com> > Hi 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 am afraid that I didn't understood what do you mean. > 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". > Do you mean to design some tooling and firmware/software for testing? > > > 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? > I'll try to fix LMS2. It is doable for me because required just warm up board and to push LMS2 a little bit. > > > 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? > If everything work, then extra current goes inside FPGA chip. So, yes, I'm sure, almost. > > > 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. It would be fine, if InlineGroup can repair this board. I know that without FPGA repair station I can easy to damage PCB and I want to do it. At least we need to order FPGA with lead solder balls to make repair at lower tem. Best regards, Andrey Sviyazov. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20121110/5f943821/attachment.htm>