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Thread: MV-1C Calender Error

  1. #1
    Fug:DDDDD
    Pasky's Avatar
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    MV-1C Calender Error

    Battery is removed.
    Crystal has a 32Mhz sine wave.
    NEC D4990A is getting +4.3V on power on (this seems normal, my other MV-1C gets this as well and boots fine to the cross hatch).

    Neo MV-1C keeps getting stuck at green screen boot, very rarely comes up with black screen saying Calender Error. I can't get the black screen anymore but it was doing it more often when it first began.

    Using a Uni-bios 3.1 free version it bypasses the error and I can boot to a game.

    I'm thinking its probably the D4990A itself. I don't see any damaged traces around the NEC chip anywhere. Anything else I should check on the chip to rule it out before considering it's bad?

    Just looking for other tech opinions before I try to replace it.

    Thanks.

  2. #2
    Robert Garcia's Butler
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    Quote Originally Posted by Pasky View Post
    Battery is removed.
    Crystal has a 32Mhz sine wave.
    NEC D4990A is getting +4.3V on power on (this seems normal, my other MV-1C gets this as well and boots fine to the cross hatch).

    Neo MV-1C keeps getting stuck at green screen boot, very rarely comes up with black screen saying Calender Error. I can't get the black screen anymore but it was doing it more often when it first began.

    Using a Uni-bios 3.1 free version it bypasses the error and I can boot to a game.

    I'm thinking its probably the D4990A itself. I don't see any damaged traces around the NEC chip anywhere. Anything else I should check on the chip to rule it out before considering it's bad?

    Just looking for other tech opinions before I try to replace it.

    Thanks.
    If the traces are OK, I would just swap it out. You could stick SMK Dan diagnostic BIOS in there and run the calendar test but I am guessing it will just sit there waiting for pulses.
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  3. #3
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    Pasky's Avatar
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    Know where to get SMD 16 pin variant of the D4990A? Can only find the DIP 16.

  4. #4
    Robert Garcia's Butler
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    Quote Originally Posted by Pasky View Post
    Know where to get SMD 16 pin variant of the D4990A? Can only find the DIP 16.
    I would love to know the answer to this too lol! Only place I know of atm is another faulty board =/
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

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