LG Model 50PS11 HDMI Issue

[wkand]

HI:

Anybody know whee I can get information about HDMI compatibility of my set with other HDMI devices such as DVD and Blu-Ray players, cable boxes etc.

I have a Phillips DVD home theater (model HTS3565D)that upconverts DVD's to 1080i and a Comcast cable box (Motorola - model unknown) that also supplies 1080i resolution.

Neither works with my LG 50PS11 Plasma TV via HDMI. Both work fine at full resolution with component inputs.

The Phillips freezes sometimes while watching a DVD.

The cable box downgrades the input on 1080i channels to 720p.

The issue is thatI do not have enough component inputs to support all devices I wish to attach.

If I can find compatibility information, then I might pursue a repair to the TV if it is broken.

The TV is still under extended warranty.

Any ideas, or known issues with any of these components?

Thanks!! ,