First you need to find the best video mode to use. that your tv can handle. you do this by typing ps3videomode -v ## were ## is the value from below.
YUV60Hz
480i - 1
480p - 2
720p - 3
1080i - 4
1080p - 5
YUV50Hz
576i - 14
576p - 13
720p - 12
1080i - 11
1080p - 10
RGB60Hz
480i - 33
480p - 34
720p - 35
1080i - 36
1080p - 37
RGB50Hz
576i - 38
576p - 39
720p - 40
1080i - 41
1080p - 42
VESA
WXGA - 11
SXGA - 12
WUXG - 13
then once you find the one that works best on your tv. edit /etc/kboot.conf and change linux='/boot/vmlinux-2.6.16 initrd=/boot/initrd.img video=ps3fb:mode:##'
If you get scrolling lines on the resolution edit. xorg.conf to look like this
Section "Device"
Identifier "Videocard0"
Driver "fbdev"
Option "ShadowFB" "false"
EndSection
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