Page 2 of 2 FirstFirst 12
Results 26 to 44 of 44

Thread: MV1C problem with battery

  1. #26
    Member ledfrog's Avatar
    Join Date
    Mar 2017
    Location
    Southern California

    Posts
    36
    Yes. No battery connected, but the board is powered on through a super gun that's only providing 5V.

  2. #27
    JammaNationX
    Xian Xi's Avatar
    Join Date
    Dec 2005
    Location
    Waipahu, Hawaii

    Posts
    27,849
    Could be a bad diode letting voltage through

  3. #28
    . cvenditti's Avatar
    Join Date
    Sep 2018
    Location
    North Carolina, USA

    Posts
    4
    Quote Originally Posted by Xian Xi View Post
    It was just easier to use a rechargeable one.
    Are you using LIR2032 or ML2032?

  4. #29
    .
    Join Date
    Jan 2020
    Location
    ruanda

    Posts
    113
    Quote Originally Posted by cvenditti View Post
    Are you using LIR2032 or ML2032?
    cyril also you too there?! XDXDXD

  5. #30
    JammaNationX
    Xian Xi's Avatar
    Join Date
    Dec 2005
    Location
    Waipahu, Hawaii

    Posts
    27,849
    Quote Originally Posted by cvenditti View Post
    Are you using LIR2032 or ML2032?
    I use lithium

  6. #31
    . cvenditti's Avatar
    Join Date
    Sep 2018
    Location
    North Carolina, USA

    Posts
    4
    I changed PC10 and C3 on my two MV-1C I still have the issue.
    Are we sure that C3 is a 0.1uf cap both of the C3 I removed measure 1uf?

  7. #32
    .
    Join Date
    Jan 2018
    Location
    Spain

    Posts
    15
    Well, in my case, I'm going to try and go back to the original setup. I already changed in another mv1c the original battery with a LIR2450 in a socket, and I like this solution (this rechargeable battery maintains power for a long time).

    So, back to the failed MV1C base, the problem is that I threw away the components (R36, D5 and D6) so I can`t identify them.
    R36 is an 300 ohm resistor, D5 is a diode and D6 a diode zener.
    Any idea of the characteristics of D5 and D6 so I can buy them?
    Thanks

  8. #33
    A Joala is for Life.
    Not Just Christmas.
    joala's Avatar
    Join Date
    Oct 2017
    Location
    over east

    Posts
    475
    After some advice, I replaced R36, D5 and D6 with these (from RS Components) just in case my originals were dodgy:

    Toshiba 45V 100mA, Diode, 2-Pin SOD-323 1SS357(F)
    301Ω 0805 Metal Film SMD Resistor 0.1% 0.125W - ERA6AEB3010V
    KEMET C0805C104K4RACTU 100nF MLCC 16V dc 10% Tolerance SMD

    Still noticing drain. Been using an LIR2477 (about the same capacity as C2032) but eventually the voltage gets too low then would stop charging.

    I have a question for James or shadowkn55 - would replacing the backup ram with these work (no battery required)?
    https://au.element14.com/cypress-sem...-28/dp/2772906
    Last edited by joala; 05-23-2020 at 09:49 PM.

  9. #34
    Maxima's Barber
    shadowkn55's Avatar
    Join Date
    Dec 2006
    Location
    SoCal

    Posts
    2,357
    I wouldn't recommend using FRAM as a substitute for SRAM because it has a finite number of accesses before it becomes unusable. Backup ram is accessed far more frequently by the bios for various functions as opposed to a low access memory device like a memory card.

  10. #35
    A Joala is for Life.
    Not Just Christmas.
    joala's Avatar
    Join Date
    Oct 2017
    Location
    over east

    Posts
    475
    Quote Originally Posted by shadowkn55 View Post
    I wouldn't recommend using FRAM as a substitute for SRAM because it has a finite number of accesses before it becomes unusable. Backup ram is accessed far more frequently by the bios for various functions as opposed to a low access memory device like a memory card.
    Ok, good tip. Thanks

  11. #36
    drunk downunder!
    aka. Muff Diver.
    lachlan's Avatar
    Join Date
    Feb 2005
    Location
    A Hard Earned Thirst

    Posts
    12,939
    Quote Originally Posted by joala View Post
    Ok, good tip. Thanks
    WHERE THE FUCK HAVE YOU BEEN!?

  12. #37
    A Joala is for Life.
    Not Just Christmas.
    joala's Avatar
    Join Date
    Oct 2017
    Location
    over east

    Posts
    475
    Quote Originally Posted by lachlan View Post
    WHERE THE FUCK HAVE YOU BEEN!?
    On smoko mate!

  13. #38
    .
    Join Date
    Jan 2018
    Location
    Spain

    Posts
    15
    Quote Originally Posted by joala View Post
    After some advice, I replaced R36, D5 and D6 with these (from RS Components) just in case my originals were dodgy:

    Toshiba 45V 100mA, Diode, 2-Pin SOD-323 1SS357(F)
    301Ω 0805 Metal Film SMD Resistor 0.1% 0.125W - ERA6AEB3010V
    KEMET C0805C104K4RACTU 100nF MLCC 16V dc 10% Tolerance SMD

    Still noticing drain. Been using an LIR2477 (about the same capacity as C2032) but eventually the voltage gets too low then would stop charging.

    I have a question for James or shadowkn55 - would replacing the backup ram with these work (no battery required)?
    https://au.element14.com/cypress-sem...-28/dp/2772906
    I rebuilt my charging circuit, and it is working again, but yes, again draining.
    I charge the battery up to 3,2 V, and when I disconnect it, it drains 0.01 V every 5 seconds.
    So in less than half an hour, it' s dead.

    I have another mv1c which works good, and the battery looses voltage at a decent rate.
    So it appears that this problem does not happen to every mv1c.

    What I've found is that, without powering the board (only with the battery fully charged), the difference of voltage between +5V and ground (measured in the jamma connector) is 0.25 V. This is extremely weird. And it does not happen with the other mv1c that works properly (difference of voltage is 0V, as it should be).

    Can you please check if you too have this small voltage between +5V and ground?

  14. #39
    A Joala is for Life.
    Not Just Christmas.
    joala's Avatar
    Join Date
    Oct 2017
    Location
    over east

    Posts
    475
    Quote Originally Posted by littlecharlie View Post
    I rebuilt my charging circuit, and it is working again, but yes, again draining.
    I charge the battery up to 3,2 V, and when I disconnect it, it drains 0.01 V every 5 seconds.
    So in less than half an hour, it' s dead.

    I have another mv1c which works good, and the battery looses voltage at a decent rate.
    So it appears that this problem does not happen to every mv1c.

    What I've found is that, without powering the board (only with the battery fully charged), the difference of voltage between +5V and ground (measured in the jamma connector) is 0.25 V. This is extremely weird. And it does not happen with the other mv1c that works properly (difference of voltage is 0V, as it should be).

    Can you please check if you too have this small voltage between +5V and ground?
    Hey mate, I think my battery is completely fucked. It drains by about half as soon as I turn the power off. I'll get a new battery and test again.....

  15. #40
    Maxima's Barber
    shadowkn55's Avatar
    Join Date
    Dec 2006
    Location
    SoCal

    Posts
    2,357
    Quote Originally Posted by littlecharlie View Post
    Can you please check if you too have this small voltage between +5V and ground?
    That means the 74HC32 needs to be replaced.

  16. #41
    .
    Join Date
    Jan 2018
    Location
    Spain

    Posts
    15
    Quote Originally Posted by joala View Post
    Hey mate, I think my battery is completely fucked. It drains by about half as soon as I turn the power off. I'll get a new battery and test again.....
    OK, keep us informed please. We might find something useful in your problem.

    Quote Originally Posted by shadowkn55 View Post
    That means the 74HC32 needs to be replaced.
    I guess I may have burnt it while doing the battery mod. I'll replace it.
    Anyway, can you please explain why you think it is damaged?

  17. #42
    Maxima's Barber
    shadowkn55's Avatar
    Join Date
    Dec 2006
    Location
    SoCal

    Posts
    2,357
    I've seen several cases where pins 12 and 13 are outputting voltage even though those pins are inputs. Pins 12 and 13 are connected to the reset circuit which involves a pull-up to the main vcc. Which effectively try to make the backup battery power the entire board.

  18. #43
    .
    Join Date
    Jan 2018
    Location
    Spain

    Posts
    15
    Quote Originally Posted by shadowkn55 View Post
    I've seen several cases where pins 12 and 13 are outputting voltage even though those pins are inputs. Pins 12 and 13 are connected to the reset circuit which involves a pull-up to the main vcc. Which effectively try to make the backup battery power the entire board.
    If that is the case, we may have found the component that is draining the battery.

  19. #44
    Maxima's Barber
    shadowkn55's Avatar
    Join Date
    Dec 2006
    Location
    SoCal

    Posts
    2,357
    Perhaps. It was one of the components I mentioned 3 months ago to check or replace.

    http://www.neo-geo.com/forums/showth...=1#post4410152

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •