You have to disconnect the HDMI cable when doing this procedure. When you connect your PS3 back to HDMI, it auto detects that HDMI cable is connected and you may hear audio first with blank screen and after few seconds, "Yes" "No" questions appears on screen. Choose "Yes" to all questions.
If your CRT TV has a 16:9 mode that squashes the picture, here's a tutorial on how to improve the PS3 resolution on a CRT TV with 16:9 mode without squashing. The picture is sharper in 16:9 mode because the interlaced lines are much closer to each other. [ Ссылка ]
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