gonk,

My model is the Panasonic TH-50PX6U -

http://www2.panasonic.com/webapp/wcs/sto...01&displayTab=S

It shows that the native resolution is 1366 x 768. I hope that this helps.
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Outlaw 990/7700, Oppo DV-981HD, Gallo S.A.Amp, Nucleus Ref. 3.1, AV C, AV M, TR-2, Paradigm Atom, Pioneer PDP-4214HD, Mtrola DCT6200/2005

Outlaw 990, Aragon 8008X3, 8008, Denon 3930CI, Dahlquist DQ20, Outlaw LFM-1+, Paradigm Atom, Mtrola DCT3416 I