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Thread: PGM IGS extreme battery leakage

  1. #1
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    PGM IGS extreme battery leakage

    I'm trying to fix a PGM IGS board which has an extreme battery leakage.
    Unfortunately few info is available online.
    For instance my board is stuck on a green/yellowish garbage screen and I'm not sure of the behaviour the board should have if for example the backup RAMs are unwritable/unreadable (broken traces).
    I will try to detail connections between ICs:

    U2
    LP61256FS-15
    32K * 8 BIT HIGH SPEED CMOS RAM
    1 A14 U6 102
    2 A12 U6 100
    3 A7 U6 95
    4 A6 U6 94
    5 A5 U6 93
    6 A4 U6 92
    7 A3 U6 91U2
    8 A2 U6 90
    9 A1 U6 89
    10 A0 U6 88
    11 I/O0 U6 103
    12 I/O1 U6 104
    13 I/O2 U6 105
    14 GND
    15 I/O3 U6 106
    16 I/O4 U6 110
    17 I/O5 U6 111
    18 I/O6 U6 112
    19 I/O7 U6 113
    20 /CE U7 16
    21 A10 U6 98
    22 /OE U6 87
    23 A11 U6 99
    24 A9 U6 97
    25 A8 U6 96
    26 A13 U6 101
    27 /WE U6 86
    28 VCC

    U3
    LP61256FS-15
    32K * 8 BIT HIGH SPEED CMOS RAM
    1 A14 U6 102
    2 A12 U6 100
    3 A7 U6 95
    4 A6 U6 94
    5 A5 U6 93
    6 A4 U6 92
    7 A3 U6 91
    8 A2 U6 90
    9 A1 U6 89
    10 A0 U6 88
    11 I/O0 U6 114
    12 I/O1 U6 115
    13 I/O2 U6 116
    14 GND
    15 I/O3 U6 117
    16 I/O4 U6 118
    17 I/O5 U6 119
    18 I/O6 U6 120
    19 I/O7 U6 121
    20 /CE U7 15
    21 A10 U6 98
    22 /OE U6 87
    23 A11 U6 99
    24 A9 U6 97
    25 A8 U6 96
    26 A13 U6 101
    27 /WE U6 86
    28 VCC

    To be continued...
    Last edited by Apocalypse; 05-02-2016 at 06:51 AM.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  2. #2
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    If you need high res pics of a working PGM board, let us know

  3. #3
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    Quote Originally Posted by aha2940 View Post
    If you need high res pics of a working PGM board, let us know
    It can't harm
    Schematics would be a plus but they don't seem to be available.
    At least with the details I give here someone could draw one.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  4. #4
    King's Bartender
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    I had the same problem. here's how I fixed it:

    https://www.facebook.com/LemonyVenge...009060/?type=3

    PGM fix.jpg
    Last edited by Lemony Vengeance; 05-02-2016 at 07:15 PM.
    It's impossible to be a nice guy on the internet.

  5. #5
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    Quote Originally Posted by Lemony Vengeance View Post
    I had the same problem. here's how I fixed it:

    https://www.facebook.com/LemonyVenge...009060/?type=3
    Thanks for the link however I knew that trick and unfortunately that trace is good on my board.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  6. #6
    King's Bartender
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    Quote Originally Posted by Apocalypse View Post
    Thanks for the link however I knew that trick and unfortunately that trace is good on my board.
    damn. :/
    It's impossible to be a nice guy on the internet.

  7. #7
    Edo Express Delivery Guy
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    I patched a dozen of traces or so and got little improvement:

    TRAP 6 error:
    DSCN4475.JPG

    OPCODE 1111 error:
    DSCN4476.JPG

    And last but not least HOST FUN ERROR:
    DSCN4481.JPG
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  8. #8

  9. #9
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    Quote Originally Posted by Xian Xi View Post
    Check the /CLK line that goes to the cart slot.
    Will do.
    However I forgot to mention that it's what I get with an empty slot (no game).
    If I manage to get it boot to the menu I'll buy a game (I already know several traces going to the cart slot are bad).
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  10. #10
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    There's something wrong with the RESET signal of the 68000 (pin 20). I haven't been able to fully track it down, it splits to each sides of the board and seems to be connected on one side to U5. However I can't read a low resistance (probably the cause why the signal is "weak").
    Xian Xi can you check it on a working one? I think the /UDS (pin 7) signal is connected to pin 69 of U5.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


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  12. #12
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    Quote Originally Posted by Xian Xi View Post
    Ah, I don't have a working one. I do know that the clock goes to the cart and connects to a quad flat pack.
    Maybe the RESET trace is good on yours.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


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  14. #14
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    Quote Originally Posted by Xian Xi View Post
    68k(20) - U5(70)
    Fantastic. Thanks!
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  15. #15
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    I fixed 68k(20) - U5(70).
    I think 2 other traces go from the 68k to U5 : R/W(9) and /IPLO(27).
    Can you check them?
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


  16. #16
    JammaNationX
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    Quote Originally Posted by Apocalypse View Post
    I fixed 68k(20) - U5(70).
    I think 2 other traces go from the 68k to U5 : R/W(9) and /IPLO(27).
    Can you check them?
    R/W(9) - U5(44)
    /IPLO(27) - U5(42)

  17. #17
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    Quote Originally Posted by Xian Xi View Post
    R/W(9) - U5(44)
    /IPLO(27) - U5(42)
    Thank you very much.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


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