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Portable Vehicle Backup Screen Problems

e14 Contributor
e14 Contributor over 12 years ago

So I followed Ben's link to the backup cameras on Amazon and I ordered two of them. I am waiting for my raspberry pi to arrive in the mail. In the meantime I was trying to build a PSone portable and was  going to use on of the screen for it. However, when I hook it up to the playstation I have issues. It will display the Sony loading screen just fine as well as the memory card/cd select screen jus fine. However, when I start to play a game on it, the image continually scrolls up on the screen. I guess it is a vertical sync problem, related to improper frequency matching between the console and display? Does this make sense and is there anything I can do to make it display the playstation images properly?

 

Also, will this be an issue with the raspberry pi?

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  • colecago
    0 colecago over 12 years ago

    Do they both do this?  What voltage do you have applied to the screens.

     

    I've never had this problem with the Pi yet, you don't have anything connected to the white do you?

     

    Maybe its some type of resolution issue judging by it only happening in game?

     

    PSONE NTSC Display Resolution

     

    +-------+--------------------+-------------------+

    | Mode | Resolution (H x V) | Scan |

    +-------+--------------------+-------------------+

    | 0 | 256 x 240 | |

    | 1 | 320 x 240 | Non-Interlaced |

    | 2 | 512 x 240 | |

    | 3 | 640 x 240 | |

    +-------+--------------------+-------------------+

    | 4 | 256 x 480 | |

    | 5 | 320 x 480 | Interlaced |

    | 6 | 512 x 480 | |

    | 7 | 640 x 480 | |

    +-------+--------------------+-------------------+

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  • e14 Contributor
    0 e14 Contributor over 12 years ago in reply to colecago

    Both screens do this. Same problems with 7.2Vdc to 12Vdc input. Only have the yellow and power connected. White is floating.

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  • colecago
    0 colecago over 12 years ago in reply to e14 Contributor

    Not sure, do you have any other things that have that output to test?  I believe SVideo can be converted to composite

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  • e14 Contributor
    0 e14 Contributor over 12 years ago in reply to colecago

    I tried my YOBO NES knock off and same thing, scrolling screen. It does display  the video correctly, it just continuously scrolls.

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  • e14 Contributor
    0 e14 Contributor over 12 years ago in reply to e14 Contributor

    I noticed on his episode where he makes the portable Atari he has to modify the resistor ladder to be compatible with the "newer" screen. Anyone have a schematic of what that change was?

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  • e14 Contributor
    0 e14 Contributor over 12 years ago in reply to e14 Contributor

    Sorry the Atari is straight RF out. So that really doesn't apply to this issue.

     

    I wish this had adjuster knobs so I could match up the vertical sync and "tune" the screen.

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  • e14 Contributor
    0 e14 Contributor over 12 years ago in reply to e14 Contributor

    The video image on the screen is perfect when hooked up to my dvd player. What is different about video game signals?

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  • colecago
    0 colecago over 12 years ago in reply to e14 Contributor

    Not sure, that's why my thought is something resolution related by the fact that it changes when you start a game.  Maybe something about interlaced vs non?

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  • colecago
    0 colecago over 12 years ago in reply to e14 Contributor

    Not sure, that's why my thought is something resolution related by the fact that it changes when you start a game.  Maybe something about interlaced vs non?

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