on my Panasonic TH-42PHD6A High Def Plasma Display there is no HDMI input
my DirecTV input is already using the component inputs. is there another available adapter from HDMI to an old TV for picture with audio?
If you want HD, you will need either HDMI or component. Otherwise, you will be limited to SD through composite or S-Video.
You could use a component video switchbox like this:
https://www.amazon.com/Component-Switch-Splitter-Selector-Converter/dp/B01M4LOU12
Otherwise, it may be time to consider a new TV.
I did find the manual for this TV, and it's a bit weird. It's really just a monitor, not a regular TV. The manual only shows a PC input, like VGA on a computer. There also appear to be covers where other inputs can be added?
https://www.manualslib.com/manual/246936/Panasonic-Th-42pwd6ux.html