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Thread: AES not booting up fix

  1. #1


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    AES not booting up fix

    I offered to take a look at a friend's AES that could not boot up.

    00.jpg
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    This was a very first revision board that did not have any daughterboards at all! Completely untouched save for the Unibios installation near the top, and which looked to be somewhat botched.

    05.jpg
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    I got to removing the socket and starting replacing individual socket pins for each. The rationale was that the board has traces above and below and using such pins allows for clearer tracing and repair.

    12.jpg
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    15a.jpg

    This image is post cleaning, it had looked like Vcc from pin 40 was going into the trace.

    18a.jpg

    The individual sockets were snipped out of these guys.

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    All socketed, pre-trace check.

    20.jpg

    Trace-checked and re-wired.

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    A piece of thick cardboard to cushion the pcb traces from a flathead screwdriver, for future EPROM updates.

    26.jpg

    On testing, the AES kept randomly rebooting.



    I recalled that a 10V power source was used on this 5V AES and I speculated that some power circuitry might be screwy. Poked around but nothing seemed amiss.

    Prior to opening the AES, I had ordered a 5V, 2A PSU with the din plug's center polarity being +ve.

    ac-to-dc-55mm21mm-55mm25mm-5v-2a-switching-power-supplyadapter.jpg

    The polarity needed to be switched to center -ve and with no screws to the case, I did not want to crack open the adaptor to swap it there. So I got this in-line power switch a week later, and I swapped it within the switch case.

    in-line-power-switch-onoff-21mm55mm-cable-jack-arduino-plug-12vcctv-camera.jpg

    I did notice that the wire gauge(thickness) used by the in-line power switch was absolutely tiny.
    I then thought to just re-wire the adaptor, which had a thicker gauge all through.

    27.jpg

    Lo and behold, it lives!



    Take home:
    1. Bios pin 31 was disconnected to the Sony CXK58256M-12L S-RAM. This appears to be the one causing the strange boot screen.
    2. Severe flickering likely due to Vcc bleeding into a trace.
    3. Insufficient gauge wire can cause resets!
    4. Use a proper desoldering station. Or do the piggyback mount method, leaving the pcb well alone.

    Putting it out there for future reference.
    Last edited by Clear Paper; 10-27-2017 at 01:37 PM.

  2. #2
    Cham Cham's Banana
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    Thats awesome - thanks for posting

    I'm seriously jealous of these guys that can troubleshoot this kind of shit. Looks like pure wizardry to me...
    Spice god of Borneo...


  3. #3
    Divine Hand of the UniBIOS
    Razoola's Avatar
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    Maybe this guy would have had a little more luck if he was using an official unibios and not a rip off.
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  4. #4
    Angel's Love Slave
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    Quote Originally Posted by Razoola View Post
    Maybe this guy would have had a little more luck if he was using an official unibios and not a rip off.
    Hehe, good point! If you don't get an official bios - karma catches up with you

    Good repair Clear Paper! One thing to note - whilst you did a great job using single socket pins there (not sure I could have got them all so straight!!!), you get additional strength and support using strips of turn pin socket rather than single socket pins. It won't cause any problems though, I am sure it will be fine as is. Well done =D
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  5. #5
    Master Cylinder Evil Wasabi's Avatar
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    Very nice laying out of the thought process in problem solving.
    All creature will die and all the things will be broken.

    Neo Geo Dip Switch wiki page

    Quote Originally Posted by SonGohan View Post
    I didn't even talk about how you live in a shack and shit in the fucking forest.
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    I mean, at least I didn't say your wife should divorce you or comment on your need to play RE while shitting or whatever else was said.

  6. #6


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    Quote Originally Posted by Razoola View Post
    Maybe this guy would have had a little more luck if he was using an official unibios and not a rip off.
    I have to admit that I've a copy of this unibios now. Where do I send the cheque? Seriously. (donation@universebios.com?)

    And great work on Crossed Swords 2! I'm slowly catching up on 9 years worth of Neo Geo news and it's mind-numbing.
    NeoGoaT
    "Someone should crate up all this spam and ship it to Ethiopia."

    Stinky-Dinkins
    "That's just not true. I always go out of my way to let people know that the size of my genitalia is less than adequate. If you keep talking dirty you might get me to a point to where it would be rigid enough to clean out your ears like a fleshly little Q-Tip."

  7. #7


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    Quote Originally Posted by GadgetUK View Post
    Hehe, good point! If you don't get an official bios - karma catches up with you

    Good repair Clear Paper! One thing to note - whilst you did a great job using single socket pins there (not sure I could have got them all so straight!!!), you get additional strength and support using strips of turn pin socket rather than single socket pins. It won't cause any problems though, I am sure it will be fine as is. Well done =D
    Thanks! These pins are much more solid than the other socket's pins shown in the picture. I didn't favour them in the past but looks like they've come in use! These pins were actually bought more than a decade ago. Lol...

    Edit: And I love your videos, very well worked through and a great resource!
    Last edited by Clear Paper; 10-27-2017 at 10:50 AM.
    NeoGoaT
    "Someone should crate up all this spam and ship it to Ethiopia."

    Stinky-Dinkins
    "That's just not true. I always go out of my way to let people know that the size of my genitalia is less than adequate. If you keep talking dirty you might get me to a point to where it would be rigid enough to clean out your ears like a fleshly little Q-Tip."

  8. #8
    Bashful Neophyte
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    Great job and thanks for expaining everthing.

  9. #9
    Divine Hand of the UniBIOS
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    Quote Originally Posted by Clear Paper View Post
    I have to admit that I've a copy of this unibios now. Where do I send the cheque? Seriously. (donation@universebios.com?)

    And great work on Crossed Swords 2! I'm slowly catching up on 9 years worth of Neo Geo news and it's mind-numbing.
    yup, thats the email, donations are always welcome.
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  10. #10


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    Done! Keep up the great work!
    NeoGoaT
    "Someone should crate up all this spam and ship it to Ethiopia."

    Stinky-Dinkins
    "That's just not true. I always go out of my way to let people know that the size of my genitalia is less than adequate. If you keep talking dirty you might get me to a point to where it would be rigid enough to clean out your ears like a fleshly little Q-Tip."

  11. #11
    Divine Hand of the UniBIOS
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    Quote Originally Posted by Clear Paper View Post
    Done! Keep up the great work!
    received, thank you so much!!!
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  12. #12


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    Thank you! I'm playing through each of my carts slowly and the Unibios cheats makes it a blast in re-discovering things, especially with the shooters.
    NeoGoaT
    "Someone should crate up all this spam and ship it to Ethiopia."

    Stinky-Dinkins
    "That's just not true. I always go out of my way to let people know that the size of my genitalia is less than adequate. If you keep talking dirty you might get me to a point to where it would be rigid enough to clean out your ears like a fleshly little Q-Tip."

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