Hi Ken, I just checked the layout and found that there are four pins for connecting the shield pins to ground and we have used a zero ohms between shield pin and ground. Is this ok to do so or should i have solid ground connection to the shield pins. Also if i replace the zero ohms with ferrite bead, will it help? Regards Vinod A H On Wed, May 23, 2012 at 8:56 PM, Ken Wyatt <ken@xxxxxxxxxxxxxxxx> wrote: > Vinod, > > Is the HDMI connector shield -directly- connected to the (metallic) > enclosure? This should ideally be multiple connections. If the shield is > floating or poorly connected, you'll get common-mode currents flowing along > the outside of the HDMI cable shield. > > Have you measured the common-mode currents with a current probe? > _______________________ > Kenneth Wyatt > Wyatt Technical Services LLC > Woodland Park, CO > Email Me! | Web Site | Blog > Subscribe to Newsletter > Connect with me on LinkedIn > > On May 23, 2012, at 9:17 AM, vinod ah wrote: > > Hi Vijay, > > We have option to control the current and voltage swing. We tried > both, without violating eye test, but still the i am seeing radiation > at 742.5MHz. The radiation level keeps chnaging as i try with multiple > cables. I found the best cable i had to be failing FCC limits by 7dB. > I used some HDMI cable which are sold by big brands, but i was failing > FCC by 12dB !!!. > > Hi Boris, > > We tested the Blu ray player and TV with same HDMI cable used for our > board testing. the Blu ray player used is from Sony while the TV is > from LG, we connected the blu ray player to TV using same HDMI cable > and took the readings. > > Regards > Vinod A H > > On Wed, May 23, 2012 at 8:43 PM, Traa, Boris <boris.traa@xxxxxxxxxxx> wrote: > > Dear Venod, > > > You said that TV is oke and Blu Ray is tested. Seperately or as a > combination with the same cables you also used to attach your board? > > > Kind regards > > Boris Traa > > System design engineer EMC > > > It's the currents that make circuits work or fail. > > > Philips Innovation Services/EMC center > > Room 2.020 > > High Tech Campus 26 > > 5656AE Eindhoven, The Netherlands > > Tel: ++ 31 40 27 43766 > > Fax: ++ 31 40 27 42224 > > E-mail: boris.traa@xxxxxxxxxxx > > > > -----Original Message----- > > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On > Behalf Of vinod ah > > Sent: Wednesday 23 May 2012 3:58 PM > > To: SI-LIST > > Subject: [SI-LIST] HDMI Frequency Failing RE Test by 7dB!!!! > > > Hi All, > > > I am designing a board with HDMI input and HDMI output. I am facing EMI > issue at 742.5MHz (failing FCC limits by 7dB) when running 1080p30 on both > Input and output HDMI i.e. BLu ray player connected to HDMI input connector > of my board is giving out data at 1080p30 and HDMI out of my board is > connected to TV which is also 1080p30 content. So i am unable to find out > how is 742.5MHz coming out as radiation as it is 10th Harmonic of pixel > clock 74.25MHz!!!!!!!. I am not facing any issues with other harmonics > except for this. So i am totally confused on how to go about debugging this > issue. > > > Note: All the signals are routed on top layer without vias and all signals > have solid ground plane reference. The blu ray player and TV used, is tested > for radiation and no significant levels seen. > > > Regards > > Vinod A H > > ------------------------------------------------------------------ > > To unsubscribe from si-list: > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > > or to administer your membership from a web page, go to: > > //www.freelists.org/webpage/si-list > > > For help: > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > > List forum is accessible at: > > http://tech.groups.yahoo.com/group/si-list > > > List archives are viewable at: > > //www.freelists.org/archives/si-list > > > Old (prior to June 6, 2001) list archives are viewable at: > > http://www.qsl.net/wb6tpu > > > > > ________________________________ > > The information contained in this message may be confidential and legally > protected under applicable law. The message is intended solely for the > addressee(s). 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