Here is my correspondence with Zenith and their rather (I'm happy to report) quick but not necessarily 'responsive' reply:
-----------Original Customer Enquiry------------
Received Date : 9/22/2005 12:35:14
The type of inquiry : Software/Hardware updates
Product/Model number : PDP TV/Z42PX2D
I am inquiring as to whether there is yet any firmware upgrade available for the above set. I am experiencing problems using upconverting DVD players such as the OPP 971H, Samsung 850, etc. through the HDMI port. There is noticeable macroblocking and overall picture blotchiness. Using Component cables yields a superior picture than using the HDMI connection but the output resolution drops back to 480P only with this connection type. As the 720P and especially the 1080i PQ on this 480P panel is so outstanding, like many owners I am trying to get an improved DVD picture using upconverting players. Unfortunately most of them use DVI-HDMI only for this upconversion and component upconversion doesn't seem to be generally available. Can you shed any light on why many of us are experiencing the problems we are having with HDMI input on the Z42? If so, what remedies do you recommend?
-----------Reply to Customer Enquiry------------
Thank you for inquiring of Zenith Electronics. This television has a native resolution of 480p. This means that it can take whatever signal is presented, and processes the signal to fit into 480 lines of resolution. This is why the progressive scan on component looks so well, is because it does not have to adjust the signal to get it to fit. Try your HDMI connection using 480p resolution to see if any better quality can be achieved. For further information or troubleshooting, you may contact us at 800-243-0000 for LG Customer Service assistance. An agent will be glad to assist you. Thank you again for contacting LG Electronics.
Neil E-mail Administrator Customer Interactive Center LGEAI
I think the only way to tell if there is some definite HDMI problem on this set is to get another player as I wrote earlier and try it out. The problems I'm currently having with the stupid DVR box and Comcast using the HDMI input are adding nothing but confusion to the upconversion player issue
As it stands now, even when it was working properly earlier this evening, I see no benefit to using HDMI over wideband component for DTV. Thus the HDMI for me is purely for DVD use if proper results can be obtained.