You can download
MonInfo, a utility that can be downloaded and run to get information from your HDTV via the DVI connection, an example:
Quote:
Monitor
Windows description......... Plug and Play Monitor
Manufacturer description.... R40W46
Manufacturer................ LG Electronics
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Plug and Play ID............ GSM0101
Serial number............... (n/a)
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Manufacture date............ 2003
EDID revision............... 1.3
Display type and signal..... Digital
Sync input support.......... (n/a)
Screen size................. 710 x 400 mm (~34")
Power management............ Not supported
Color characteristics
Display gamma............... 2.20
Red chromaticity............ Rx 0.640 - Ry 0.340
Green chromaticity.......... Gx 0.300 - Gy 0.690
Blue chromaticity........... Bx 0.138 - By 0.038
White point (default)....... Wx 0.270 - Wy 0.365
Timing characteristics
VESA GTF support............ Not supported
Horizontal scan range....... 31-45kHz
Vertical scan range......... 59-60Hz
Video bandwidth............. 80MHz
Timing recommendation #1.... 1920x1080 at 30Hz
Modeline................ "1920x1080" 74.250 1920 2008 2052 2200 1080 1084 1094 1124 interlace +hsync +vsync
Timing recommendation #2.... 720x480 at 60Hz
Modeline................ "720x480" 27.000 720 736 798 858 480 489 495 525 -hsync -vsync
Standard timings supported
720 x 480 at 60Hz - LG Electronics
1920 x 1080 at 30Hz - LG Electronics
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Note that the 30Hz indicates these are interlaced timings.
This info will come from the Sharp and may tell you what is going on.