Hi Ken, Sorry the wording were not proper. Here is the corrected one. I just checked the layout and found that there are four shield pins 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 9:11 PM, vinod ah <ah.vinod@xxxxxxxxx> wrote: > 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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