I'm not so sure your ports have gone bad. We have had numerous compatibility problems with Panasonic's 50PX60U HDMI ports. It is clear that the two ports operate differently, usually with HDMI 2 offering some kind of display output. HDMI 1 doesn't seem to work with any devices that are up to the current HDMI standard (PS3, HTPC w/HDMI video out, Comcast DVR, etc.).
I remember reading the that Panasonic implementation of the HDMI standard w/AV Control was causing problems with various non-Panasonic HDMI equipment. I beleive HDMI 1 reports itself as a 'HDMI repeater', so most of the HDMI sourcing devices refuse to output video due to HDCP.
Comcast's Scientific Atlanta HD-DVR box will actually tell you the TV (TH-50PX60U) "does not comply with HDCP requirements, so you must switch to Component Video outputs." Our Comcast DVR worked fine for the first 6 months, until Comcast (SA?) pushed out a firmware upgrade (~2008), then the HDMI HDCP problem stopped output via the HDMI port.
I suspect the PS3 will not work with HDMI 1, it may work straight into HDMI 2, but we get very mixed (flaky) results with HDMI 2 input.
I would like to understand if Panasonic has solved their HDMI issues on the latest models.