I tried to get on this site http://www.pioneerelectronics.com/portal/site/EC/template.PAGE/login/?javax.portlet.tpst=a0c6546f67a0fafb28290b1052768a0c&javax.portlet.prp_a0c6546f67a0fafb28290b1052768a0c_viewID=MY _PORTAL_VIEW&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken

but it doesn't take the serial number of my Pioneer 141.Should I be concerned??

Call 800 421 1625 and speak to Pioneer or you can call your dealer, also make sure you enter it in full

Is the complete number on the outside of the factory box??

Is the complete number on the outside of the factory box??

Yes it should be but I would look at the back of your TV to be for sure :)