HDMI gubbings - Teh Forum

<body> <div id="header"> <span class="left"> <span class="back"><a href="lthread_list.php?webtag=DEFAULT"><span class="image mobile_back" title="Back"></span></a></span> <span class="image mobile_logo" title="Beehive Forum Logo"></span> </span> <ul> <li> <a class="reply_all" href="lpost.php?webtag=DEFAULT&reply_to=42127.0&return_msg=42127.1"> <span class="image mobile_reply_all"></span><span class="text">Reply to All</span> </a> </li> <li> <a class="navigation" href="#"> <span class="image mobile_navigation"></span><span class="text">Show messages</span> </a> </li> <li> <a class="main" href="#"><span class="image mobile_menu" title="Menu"></span> </a> </li> </ul> </div> <div class="menu main"> <ul> <li><a href="lthread_list.php?webtag=DEFAULT">Messages</a></li> <li><a href="lpm.php?webtag=DEFAULT">Inbox</a></li> <li><a href="lsearch.php?webtag=DEFAULT">Search</a></li> <li><a href="llogon.php?webtag=DEFAULT">Login</a></li> </ul> </div> <div class="menu navigation"><a href="lmessages.php?webtag=DEFAULT&msg=42127.1">1–10</a><a href="lmessages.php?webtag=DEFAULT&msg=42127.11">11–20</a>…<a href="lmessages.php?webtag=DEFAULT&msg=42127.31">31</a></div> <div id="page_content"> <h3 class="thread_title"><a href="index.php?webtag=DEFAULT&amp;msg=42127.1">HDMI gubbings</a> </h3> <div id="messages" data-navigation="42127_1_31_10"> <a name="a42127_1"></a><div class="message" id="message_42127_1"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">23 Feb 2018 10:23</span> <div class="clearer"></div> </div><div class="message_to">To: ALL<span class="message_count">1 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.1">42127.1</a></div> <div class="message_body"> Morning all.<br /><br /> I wanted to run this issue I'm having with an HDMI cable past you all, just to see if teh hive mind can help, or suggest some other troubleshooting I've not thought of.<br /><br /> In one of the boardrooms at work, there's a TV with a HDMI lead chased into the wall, it then goes under the suspended floor and into a floorbox. From there the cablers added a faceplate into the floorbox with a short female to female HDMI extension lead joining the one from the TV to whatever device we want to plug into the faceplate. So, nice n' simple. However, we've been seeing some weird aberrations on the screen recently - this goes from a few green dots to lots of green dots, plus some colour blurring etc. So, I've tried the usual stuff, testing with other cables, laptops and screens to rule out faulty connections/kit. The weak link seemed to be the short female-female cable, as bypassing that meant the dots et al disappeared and I got a clean image. I ordered a replacement, fitted it and got the same problem, albeit not as bad. The attachments show what the old and new cables produced on the screen. I took the short extension out of the faceplate just in case it was picking some electrical noise up from the VGA and sound cables in there, but it didn't improve. The kicker here is that I've since tried the new extension cable on another TV and it works fine. <span class="emoticon e_angry" title=":-@"><span class="e__">:-@</span></span><br /><br /> I've read this morning that the refresh rate of the screen might be to blame, so I can check that out the next time I'm over in that office. Anyone got any other ideas?! <span class="emoticon e_curlyhappy" title=":J"><span class="e__">:J</span></span><div class="edit_text">EDITED: 23 Feb 2018 10:23 by GRAPHITONE</div> </div> <div class="message_attachments"> <span>Attachments:</span> <ul> <li><span class="image attach"></span><a href="get_attachment.php?webtag=DEFAULT&hash=57b9140aed434ed685c248e9d1e9fc12&filename=New.jpg" target="_blank">New.jpg</a></li> <li><span class="image attach"></span><a href="get_attachment.php?webtag=DEFAULT&hash=9be8ade5aa7e96886947ec943ca57461&filename=Old.jpg" target="_blank">Old.jpg</a></li> </ul> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.1&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.1"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_2"></a><div class="message" id="message_42127_2"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">23 Feb 2018 10:39</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 23 Feb 2018 10:48"></span></span> <span class="message_count">2 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.2">42127.2</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_1" target="_self">42127.1</a></div> <div class="message_body"> "we've been seeing some weird aberrations on the screen recently"<br /><br /> What changed in your setup? Does the screen look ok with a direct connection to device? Is the total length of cabling an issue?</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.2&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.2"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_3"></a><div class="message" id="message_42127_3"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">23 Feb 2018 10:55</span> <div class="clearer"></div> </div><div class="message_to">To: CHYRON (DSMITHHFX) <span><span class="image post_read" title="Read: 23 Feb 2018 15:54"></span></span> <span class="message_count">3 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.3">42127.3</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_2" target="_self">42127.2</a></div> <div class="message_body"> Nothing changed, it's just degraded over time.<br /><br /> Like I said, I've bypassed the female to female extension cable, plugged the lead from the TV straight into the laptop (which I didn't make clear before, sorry!) and things were fine. Taking that setup (the extension cable, HDMI lead to laptop and the laptop itself) and trying it on another TV things were also fine. It's the just the in situ setup at that office, using the extension that things bugger up.<br /><br /> I don't think the length's an issue, it's no more than 5 metres of cable.<div class="edit_text">EDITED: 23 Feb 2018 10:59 by GRAPHITONE</div> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.3&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.3"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_4"></a><div class="message" id="message_42127_4"> <div class="message_header"> <div class="message_from"> From: william (WILLIAMA)<span class="message_time">23 Feb 2018 12:35</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 23 Feb 2018 13:36"></span></span> <span class="message_count">4 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.4">42127.4</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_3" target="_self">42127.3</a></div> <div class="message_body"> The received wisdom used to be that since HDMI is a digital signal, any old cable would do so don't waste your money on flashy stuff. In fact it's incredibly prone to problems from connections, EM interference, poor quality internal wire causing digital errors, sharp bends round walls, etc. Some older monitors and TVs emphasise this. <br /><br /> Is there a staff kitchen next to the boardroom with a fridge/fan/water-cooler/whatever in it? (Especially if it wasn't there before). Is there a huge run of Ethernet/mains/sound cabling or similar sharing the underfloor route?<br /><br /> How old is the TV/Monitor? Our old plasma telly distorted and complained like mad unless it had decent shielded cable plugged into it.<br /><br /> I still don't completely understand your setup. have you been able to remove the chased-in cable to test that separately, i.e. have you been able to test it when it's free of its conduit with or without the female/female extension? Might be worth spending a couple of pounds on some clip on ferrite chokes if all else fails.</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.4&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.4"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_5"></a><div class="message" id="message_42127_5"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">23 Feb 2018 13:53</span> <div class="clearer"></div> </div><div class="message_to">To: william (WILLIAMA) <span><span class="image post_read" title="Read: 23 Feb 2018 13:53"></span></span> <span class="message_count">5 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.5">42127.5</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_4" target="_self">42127.4</a></div> <div class="message_body"> The chased in cable going to the floorbox from the TV works fine - I've plugged a laptop directly into that and all's well, as is the rest of the cabling when removed from the floor box (the female/female cable and the lead from that to the laptop). It's just when the female/female is used in the floorbox that we see issues. It could well be some EM interference from adjacent power cables, but the direct connection to the TV in the floorbox inamongst all that works fine. Apart from the mains cables for the room itself, there aren't any others running through that part. Most are in the ceiling void anyway. I don't know if the old cables are shielded or not, and it's almost certain that the female/female connector isn't, but I can test that this aft in a similar setup in our main office boardroom.<br /><br /> We don't get the cheap cables, we go for the lower end of the branded ones.<br /><br /> The TV's an 5-6yr old plasma. Did you see a similar kind of distortion to that which I'm seeing?</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.5&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.5"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_6"></a><div class="message" id="message_42127_6"> <div class="message_header"> <div class="message_from"> From: william (WILLIAMA)<span class="message_time">23 Feb 2018 14:25</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 23 Feb 2018 14:46"></span></span> <span class="message_count">6 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.6">42127.6</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_5" target="_self">42127.5</a></div> <div class="message_body"> No, just periodic break ups across the whole picture. <br /> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.6&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.6"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_7"></a><div class="message" id="message_42127_7"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">23 Feb 2018 15:00</span> <div class="clearer"></div> </div><div class="message_to">To: ALL<span class="message_count">7 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.7">42127.7</a></div> <div class="message_body"> I don't know if it makes any difference, but the dots and other artefacts appear in the same place each time something's connected.<div class="edit_text">EDITED: 23 Feb 2018 15:00 by GRAPHITONE</div> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.7&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.7"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_8"></a><div class="message" id="message_42127_8"> <div class="message_header"> <div class="message_from"> From: milko<span class="message_time">23 Feb 2018 17:53</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 23 Feb 2018 18:42"></span></span> <span class="message_count">8 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.8">42127.8</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_7" target="_self">42127.7</a></div> <div class="message_body"> so, the female-to-female adapter/cables are shit even fresh out of the box? I don't currently see what else it could be. Possibly, messing with resolution (to a lower one or a native one) and/or refresh rate would work around it. I had a cable that could only do 720p once, that was weird.</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.8&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.8"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_9"></a><div class="message" id="message_42127_9"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">23 Feb 2018 18:44</span> <div class="clearer"></div> </div><div class="message_to">To: milko <span><span class="image post_read" title="Read: 23 Feb 2018 23:13"></span></span> <span class="message_count">9 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.9">42127.9</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_8" target="_self">42127.8</a></div> <div class="message_body"> Seems that way. <span class="emoticon e_csad" title=":C"><span class="e__">:C</span></span> <br /> <br /> I'm over there again early next week, so I'll get to mess around with it again then. </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.9&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.9"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a42127_10"></a><div class="message" id="message_42127_10"> <div class="message_header"> <div class="message_from"> From: ANT_THOMAS<span class="message_time">23 Feb 2018 22:44</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 24 Feb 2018 16:07"></span></span> <span class="message_count">10 of 31</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=42127.10">42127.10</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=42127.1#a42127_9" target="_self">42127.9</a></div> <div class="message_body"> What milko said, sounds like the coupler is rubbish.<br /> <br /> I've had HDMI cables that don't play nice with CEC communication (controlling TV, amplifier, volume etc). Also recently had a setup where CEC was working great, then just decided it didn't fancy it anymore. Changed all cables, changed all settings, couldn't get the magic combination of whatever along with a suitable sacrifice to get them talking properly again. Total ballache. </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=42127.10&return_msg=42127.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="42127.10"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div></div> <div class="message_page_footer"> <ul> <li class="right_col"><form accept-charset="utf-8" method="get" action="lmessages.php" target="_self"><input type="hidden" name="webtag" id="webtag" class="bhinputtext" value="DEFAULT" dir="ltr" /><input type="hidden" name="msg" id="msg" class="bhinputtext" value="42127.11" dir="ltr" /><input type="submit" name="submit" id="keep_reading" value="Keep reading…" class="button" /></form></li> </ul> </div> </div> </body>