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Thread: more PSOne LCD questions

  1. #1
    Constant Bitrate
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    more PSOne LCD questions

    I finally got my PCI Radeon 7000 installed. I had to upgrade to WinXP because Win2000 kept reinstalling the onboard video for some reason.
    Ive read some conflicting info about which wires go where. Ive tried a few different ways but havent gotten anything to show on the screen. I'm attempting to connect my VGA cable directly to the CN4 connector that goes to the main LCD board.
    One possible issue is my power supply. The offical sony supply is 7.5V/3A. (The Sony adapter normally provides power for the LCD and the PS1 itself.)The AC/DC adapter I got from radio shack is 7.5V/0.5A. I figure it should supply enough current to run the LCD. My multimeter says its putting out 8.2V but I cant get a current (amperage) reading from it. The screen does flicker slightly when I plug it in.
    I bought a VGA extension cable with 15pins inside. I cut the cable, stripped each wire, and tested for continuity with the socket. I believe I have correctly identified each wire.

    These are the connections I have...
    Name -- CN4 -- VGA
    +7.5V -- 1 -- wired to DC power socket
    GND -- 2 -- wired to DC power socket
    Csync -- 3 -- 13(Hsync) and 14(Vsync)
    Red -- 4 -- 1
    Green -- 5 -- 2
    Blue -- 6 -- 3
    GND -- 7 -- 6, 7, 8
    DDC -- 12 -- no 9 pin, 12 or 15 maybe??

    If I plug the LCD in while windows is running, should I see some distorted image on the screen? Or will nothing show up until I have configured Power Strip?

    Its an offical Sony NTSC screen. Thanks for any advice you can give me...

    EDIT: for reference, the Radeon VGA pinout
    1 red
    2 green
    3 blue
    4 NC
    5 GND (analog)/self test
    6 red return (GND)
    7 green return (GND)
    8 blue return (GND)
    9 +5V
    10 digital GND/sync return
    11 digital GND
    12 SDA (DDC data)
    13 H sync
    14 V sync
    15 SCL (DDC clock)
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  2. #2
    And then I was mod. Tidder's Avatar
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    You should see some junk on the screen before powerstrip loads.

    Are you sure your screen is powering on at all? I found some crazy wire on my PSone screen, if I touched it, my screen would turn off. If I grounded it it would also shut off. No idea what it does.
    Tidder

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  3. #3
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    the screen may not be powering on. I heard you should be able to see the OSD when you adjust the contrast. I dont see anything but a small flicker when I plug or unplug it. Ive tried adding 5V to the DDC line and it didnt make a difference.
    I'd like to know more about that mystery wire...
    My first carPC!
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    Soon to actually find its way into the car!

  4. #4
    And then I was mod. Tidder's Avatar
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    I think it's the 5v line, disconnect it. I don't have that hooked to anything.
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  5. #5
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    Have you still got the parts that have the composite video in? Why not try to see if the screen work with that input.

    I get a feeling the voltage/current you are supplying are not enough.

  6. #6
    And then I was mod. Tidder's Avatar
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    What's the word man?
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  7. #7
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    I'm tempted to try to composite input. I never tested the screen before I took it apart. (I know I should have...)
    I'll pick up the video adapter cable and try to get that to work. I have the composite input board but I cut off the CN4 connector (cut the wires just above the plug). I think it should still work with just the CN5? cable (10 pins from LCD board to input board).

    as far as voltage/current, if my ac/dc adapter is rated for 7.5V/0.5A and its supplying 8.2V, doesnt that mean its supplying less than 0.5A?? That could be a problem.
    I currently have my VGA to CN4 connections twisted together. I havent soldered anything except the 2 power wires to the power jack.

    I picked up a virus on my main PC at home, so I'm trying to fight thru that and get back online.
    My first carPC!
    MP3/CD player
    Celeron 633MHz - 10GB Seagate - 64MB PC100 - Win XP

    Soon to actually find its way into the car!

  8. #8
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    is the adapter supply 8.2 v at no load? or maybe you can try a differnent adapter.

    btw, does radeon 7000 support c-sync?

  9. #9
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    it measures 8.2V with it connected to the screen. but if the screen isnt powering on, then I guess thats considered 'no load'. I tried to test the current, but I didnt get a reading. My mulitmeter only goes up to 200mA though. I thought I should see some indication if the circuit had more current than that.

    Yes the Radeon supports Csync. (the option is there in powerstrip, at least.)

    I forgot to stop at radio shack during lunch, so I'll try to get the A/V cable on the way home.

    EDIT: I also bought a car adapter. But I dont have an inverter yet, so I cant really try it in the car. I do have an old laptop though...
    My first carPC!
    MP3/CD player
    Celeron 633MHz - 10GB Seagate - 64MB PC100 - Win XP

    Soon to actually find its way into the car!

  10. #10
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    Quote Originally Posted by hannibal
    it measures 8.2V with it connected to the screen. but if the screen isnt powering on, then I guess thats considered 'no load'. I tried to test the current, but I didnt get a reading. My mulitmeter only goes up to 200mA though. I thought I should see some indication if the circuit had more current than that.

    Yes the Radeon supports Csync. (the option is there in powerstrip, at least.)

    I forgot to stop at radio shack during lunch, so I'll try to get the A/V cable on the way home.

    EDIT: I also bought a car adapter. But I dont have an inverter yet, so I cant really try it in the car. I do have an old laptop though...
    The screen will go out of standby as soon as a video signal is received from its AV input. Make sure you get the right AV plug, most poeple get confused ith it.

    Ill measure the current drain on mine, Ill post it tomorrow.

    Just incase you didnt already know, the best way to set the screen up is to have 2 graphics cards. Set one of them as the primary and the other one assigned to the psone with "extend to this screen" option on. You can then just play around with the setting as much as you like without loosing the display.

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