I added the FCC search option initially based on my first search returning one example from a supplier whose North American office is near me in the Atlanta area. I tried a couple other big names and didn't want to sort through hundreds of entries, so there was an early morning WalMart trip today to look at labels. The FCC ID portion of current generation smart TV labels now gives the WiFi module supplier's ID with "Contains xxxx ID yyyyyy" language. Oh well....
Also, am interested to know if anyone has comparison data with respect to TV size? From comments thus far and looking at a handful of tear down videos/pictures, I wonder how dramatic the differences may be between a 40" and a 70". Integrated speakers and button controls would give a nice range of internal cable lengths, as well as the raw panel size and power supply differences. I have seen differences in raw panel grounding schemes. With your cables and couplers experience, any feedback from the suppliers and are they all current HDMI adopters? It might be worth contacting the Lattice Semiconductor ATC for feedback. You never know if you are working with a part number which is different from the initial sample required by the HDMI testing policy. I had one experience in the DisplayPort world where a repeater was not certified though the main silicon inside was. Cheers, Adam in Atlanta On Tue, Jan 10, 2017 at 8:13 PM, Brent DeWitt <[email protected]> wrote: > Excellent suggestion about the teardown sites! I hadn’t thought of that. > The problem with FCC filings is there really aren’t any. TVs are > verification only devices. There isn’t a reason for them to be posted to > the FCC site (wish there was). > > > > Good thoughts on the evolution of the display world. > > > > One thing of particular note is the characteristics of 4k (or even 1080p) > HDMI. It has four high speed differential pairs (TMDS) that have specified > transition times between 85 and 45 psec. It takes only the slightest skew > in this signal to create significant CM voltage on the system. I’ve found > any number of commercially available cables and couplers that blow through > the emissions limits when used between an otherwise compliant source and > sink. > > > > *From:* Adam Dixon [mailto:[email protected]] > *Sent:* Tuesday, January 10, 2017 7:23 AM > *To:* [email protected] > *Subject:* Re: [PSES] lowest emissions 4k TV? > > > > In addition to the recommendations such as James', it may be worth some > time looking at teardown videos (YouTube, iFixit, etc.) and FCC filings > (the internal photos entry among all of the documents) to get an idea of > construction. You won't know if you get a similarly well-performing sample > like James' or an out-of-spec dud when you make the purchase > decision.....unless 17 other PSTC members recommend the same make/model. ;-) > > Also, maybe a colleague on the list would have insight for the > construction of medical class 4K displays versus consumer class in the > event there are better regulatory margins that accompany the > grayscale/color rendering performance requirements (whether implemented in > hardware or firmware). > > From my experience, there has been a shift in the display industry when > looking at internal construction where ferrite beads, metal foil tapes, > outer metal chassis have disappeared and it's now an LCD panel with its own > regulatory behaviors and several PCBs (power supply, TCON, scaler, WiFi, > etc.) bolted on the back with a mix of flex and discrete wire > harnesses....all covered by a rear plastic cover. Some of the shift is a > function of moving from CCFL to LED backlighting, some from having strictly > digital I/O and probably a few other factors like better PCB design/layout > to ensure robust high speed I/O performance. > > And a last option depending on time/$$ for comparison testing may be to > use a different display load (projector, HDMI extender, etc.) to understand > the relative behaviors. > > > > -Adam in Atlanta > > > > On Tue, Jan 10, 2017 at 5:30 AM, Pawson, James <[email protected]> > wrote: > > Hi Brent, > > > > I’ve had some success with a (now slightly old) Samsung 4k TV that wasn’t > too noisy, model UE48JU7000T. > > > > James > > > > > > > > *From:* Brent DeWitt [mailto:[email protected]] > *Sent:* 10 January 2017 01:57 > *To:* [email protected] > *Subject:* [PSES] lowest emissions 4k TV? > > > > Hi group, > > > > Any suggestions on the best available 4k TV for emissions testing > support? We seem to be in a continuous churn of looking for good, > commercially available, sources and sinks. It would be a real plus if it > also had ARC capability! > > > > I’m also wondering if there would be much support for a WIKI site for the > EMC community to post their findings on support devices. Nothing > proprietary, just measurements of “off the shelf” support equipment like > TVs, monitors and sources. > > > > Thanks all! > > > > Brent DeWitt > > Milford, MA > > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > Virus-free. *www.avast.com* > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > - > ---------------------------------------------------------------- > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > *[email protected]*> > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > All emc-pstc postings are archived and searchable on the web at: > *http://www.ieee-pses.org/emc-pstc.html* > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > Attachments are not permitted but the IEEE PSES Online Communities site at > *http://product-compliance.oc.ieee.org/* can be used for graphics (in > well-used formats), large files, etc. > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > Website: *http://www.ieee-pses.org/* > Instructions: *http://www.ieee-pses.org/list.html (including how to > unsubscribe)* > List rules: *http://www.ieee-pses.org/listrules.html* > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > For help, send mail to the list administrators: > Scott Douglas <*[email protected]*> > Mike Cantwell <*[email protected]*> > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > For policy questions, send mail to: > Jim Bacher <*[email protected]*> > David Heald <*[email protected]*> > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > - > ---------------------------------------------------------------- > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. 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To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
