C64 Component Video Mod: Artifacts in the first minutes after power on

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  • October 13, 2020 at 6:55 PM #42075
    tom64
    Participant

    I’ve installed the DIY Kit in a C64 with Board 250407. The voltage select jumper is set to 12V (closed). The board ist connected via component output to a Panasonic LCD-TV.

    Problem: For the first 2-3 minutes after switching on the C64 there are horizontal artifacts in the picture. After that time the picture is stable. Same in 576i and 576p mode. This happens only if the system ist cold. S-Video output is everytime ok.

    Do you have an idea to fix the problem? I‘ve made short video, but I don‘t know how to upload it here.

    October 23, 2020 at 9:50 AM #42313
    BuckoA51
    Keymaster

    Please can you try re-seating the VIC to and VIC2 adapter and give it a good, firm push?

    October 24, 2020 at 11:21 AM #42341
    tom64
    Participant

    Many thanks for your response.

    Result: In the first few seconds, the image is free of artifacts. After that, the artifacts appear permanently.

    October 30, 2020 at 11:48 AM #42466
    djc6
    Participant

    I put a link to a video in one of my forum posts by uploading it to dropbox, sharing it publicly and then putting a link in the forum post:

    64C Image scrolling vertically w/component mod

    October 30, 2020 at 2:21 PM #42471
    TheCorfiot
    Participant

    Hi Tom64

    The fact that the symptoms have changed by adding pressure to the socket leads me to believe that you may have a Worn VIC II socket. Commodore were known for saving costs as much as possible.
    Does a friend or someone close have a C64 you can plug the board into to test, note you dont need to solder any connection to the mainboard to just use the component out

    October 30, 2020 at 2:24 PM #42472
    TheCorfiot
    Participant

    Any issues with these boards tends to be bad contact in the VIC II Socket
    You can also try cleaning the socket with contact cleaner.

    And dont be afraid to fit the VIC II adapter firmly into place 🙂

    November 4, 2020 at 8:46 PM #42620
    tom64
    Participant

    I continued testing with the help of your tips. The behavior is now like this:

    If the C64 is cold (e.g. last use a day before) the picture only appears a few minutes after you have switched it on again.
    At first there are no artifacts. In the next few minutes the artifacts increase. After maybe 6-7 minutes the artifacts will disappear and the image will be stable.

    This behavior is very mysterious.
    When I have a little more time, I will test the mod with a different board, e.g. 469 instead of 407.

    November 13, 2020 at 9:11 PM #42811
    tom64
    Participant

    I hope I’ve solved the problem. I programed the firmware 2.9 to the board (rev 3). This looks very much better. No artifacts any more with the 407 board.

    Additionally I made a new layout for the VIC II-adapter. That fits better to the 407.
    Look at the repository: https://github.com/TMO2018/C64-Video-Enhancement

    November 18, 2020 at 11:39 PM #42912
    BuckoA51
    Keymaster

    Glad you got it sorted, I’d missed that there was a new adapter.

    February 10, 2021 at 1:23 PM #45156
    a7mag3ddon
    Participant

    Sorry to add to this post, my install also does the artifact for 5 mins until warmed up, ive had mine installed since december so not sure what firnware is on mine.

    Are there any instructions for updating? I have several USB programmers so hopefully have something i can use.

    Thanks

    Ps.. please check the new post im going to make regarding missing RED 🙂

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