Neo Geo Mini

Cozmic

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Indeed, looks to me like the joystick bug is getting triggered by a grounding problem. When the volume is down there is not much current to go to ground (because nothing is being transferred into the speakers and thus the system). When up, the current is missing ground and interfering with the resitors of the controller.

It looks that this can be worked around by changing the resistors (the xbox 360 resistor fix), but this doesnt change the source of the problem (grounding)

What do you guys think?
 

shinrukus

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Indeed, looks to me like the joystick bug is getting triggered by a grounding problem. When the volume is down there is not much current to go to ground (because nothing is being transferred into the speakers and thus the system). When up, the current is missing ground and interfering with the resitors of the controller.

It looks that this can be worked around by changing the resistors (the xbox 360 resistor fix), but this doesnt change the source of the problem (grounding)

What do you guys think?

Actually theres someone here a couple pages back that tells you how to fix that. My theory is power related, but grounding still seems the more culpable culprit...
 

Cozmic

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Yes i read that, but it also seems people are doubting that the grounding problem is the root cause.
 
Last edited by Cozmic,

Bubbypop

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I just left a mobile phone usb c charger in player1 slot and the bug has gone

--------------------- MERGED ---------------------------

I just left a mobile phone usb c charger in player1 slot and the bug has gone
Not plugged in or switched on

--------------------- MERGED ---------------------------

Hi I just found out if u leave a otg and usb flash drive in player1 slot the bug completely gone
 

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shinrukus

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Yes i read that, but it also seems people are doubting that the grounding problem is the root cause.
Here's the thing, there's more and more mounting evidence that its power, not to mention fixing power conductivity does fix the bug... but we dont understand HOW some people get it, and some dont. I'm lost on this one
 

Bubbypop

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Ok I've tried every usb slot in the house and the only one that lets me play ngm with sound up and no joystick bug with a otg and flash drive is a little TV upstairs
 

Bubbypop

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Ok 2secs

--------------------- MERGED ---------------------------

--------------------- MERGED ---------------------------

Ok 2secs

--------------------- MERGED ---------------------------
There you go
 

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jidatui

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I think it is a rare hardware problem caused by flash. The replacement of resisters might be a good method.

About the Japanese version, the increase of the resistence value of the LEFT resister will increase the dead zone. Thus, I am trying to find the proper resister now. Maybe 15k, maybe 20k.
 
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jidatui

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Finally, the bug was resolved, after I replaced with a 0805 13k resister. It is the final solution for the Japanses version. Thank all of you!

Now I am going to post this method on a famous game vedio forum in China.
 

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alkar

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it's amazing how flashing can create a hardware issue. Then you guys seem to believe flashing back the original image (if it was available to begin with) would fail the same.
 

jidatui

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it's amazing how flashing can create a hardware issue. Then you guys seem to believe flashing back the original image (if it was available to begin with) would fail the same.

Even if the bug was caused by flashing or hardware problem, it still could be eleminated by software methods. I think there must be a config file in the system.img that is controlling the dead zone of each direction, because it is an analog stick.

--------------------- MERGED ---------------------------

Hardware modification is an awkword solution for the bug. However, some of the Chinese players are now suffering from the bug in the worst situation, because the stick is moving forward left AUTOMATICALLY!

I think a perfect software method will come at last.
 
Last edited by jidatui,

Bubbypop

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Well that's positive mate let's hope that a software mod is doable

--------------------- MERGED ---------------------------

Saying that my friend old man rukus tried to edit the config.xml in the system.img but with no luck

--------------------- MERGED ---------------------------

Take a look
 

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jidatui

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I just tested the 13k resister, and it was perfect.

I had 5k, 10k, 11k, 12k, 13k, 14k, 15k and 20k.

Now I can wait for the software solution in peace.
 

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