https://archivedforum.beoworld.org:443/forums/42.aspxAdvanced Technical Forum for discussion of Bang & Olufsen products at component level.enCommunityServer 2008 SP2 (Build: 31104.93)https://archivedforum.beoworld.org:443/forums/thread/210098.aspxFri, 12 Jun 2009 13:01:11 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:210098stotty11110https://archivedforum.beoworld.org:443/forums/thread/210098.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=210098<p>Got an mx7000, also a 4000,ie &nbsp;the current beast - use av2 connection&nbsp;- but without it connected to anything would assume the on / off led would light or does it need to be in service so to speak with a signal from the tv?</p> <p>Have also replaced the on board 15v zener to no avail</p> <p>t</p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/210097.aspxFri, 12 Jun 2009 12:53:54 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:210097PhilLondon0https://archivedforum.beoworld.org:443/forums/thread/210097.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=210097I used to use one and I do remember having to reverse the polarity of the power adapter to get it to work! What is your TV? What do you connect at the back of the expander. p.<div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/210091.aspxFri, 12 Jun 2009 11:30:18 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:210091stotty11110https://archivedforum.beoworld.org:443/forums/thread/210091.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=42&PostID=210091<p>Got one of these beasts off Andy of Weston on appro so to speak having difficulty getting it to work !</p> <p>Peter has very kindly been of assistance in verifying the power pack is the correct one.</p> <p>However the pic on the case indicates the +ve supply line is the centre of the&nbsp;socket and the outer sheath&nbsp;is negative - the power pack has been setup in this manner but the piece don&#39;t work, have opened up the box and the socket on the board appears to take the +ve feed onto the -ve&nbsp; side of the first decoupling electrolytic cap this cannot be correct tried the supply the other way round still don&#39;t work !</p> <p>Suggestions gratefully taken onboard!</p> <p>Come on guys/gals help please!</p> <p>Tony</p><div style="clear:both;"></div>