[stephanehl]

Well, i find this setting message from it manual - Resolution setting: 480P, 720P, 1080i, 1080P.
Use “RES.” key at front panel to set the output resolution. The sequence is in a circling order.
If the picture can not show on screen, the TV may not support that resolution you select.
Please change to another resolution. For example, if the TV can not show while you select
1080i, please try to change resolution to 720p, 1080p etc. to meet the resolution and format
that TV supports.

Why the TV could not display the 1080i output from my HDV6 unit ?
When up-scaling the video signal to the 1080i level, some LCD TVs or other flat panel
displays may not support the interlaced video unless the 1080i is de-interlaced before
showing on the screen under that circumstance. If 1080i can not show on your TV, please
change the output resolution from your HDV6 to 720p, 1080p etc. to match what TV supports.

So my next question is that how to downscale 1080p - 60hz to 1080i - 50/60hz?

Any suggestion?