Neogeo 4 Slot

PCB problems and fixes
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gnomx
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Neogeo 4 Slot

Post by gnomx »

Hi there.
I have got a Neogeo 4 slots , I've installed Unibios 3.3 free version and I plugged it.
So I got these issues:

Slot 1 ( Works but lines on screen ):

Image

Others three slots don't work.
If I enter in test menu I get just one slot , other three, it doesn't show up.

Image
Image
Image

Any ideas?
Maybe faulty board or some connectors oxidation??
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thegreathopper
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Re: Neogeo 4 Slot

Post by thegreathopper »

Check voltage and clean your slots, carts
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Re: Neogeo 4 Slot

Post by gnomx »

thegreathopper wrote: December 3rd, 2019, 9:32 pm Check voltage and clean your slots, carts
I've already clean them but unfortunately it didn't work.
Should I use some special cleaner??
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Re: Neogeo 4 Slot

Post by thegreathopper »

Measure your 5 volts on the jamma connector on the 4 slot, you probably need to turn up your voltage a bit.
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Re: Neogeo 4 Slot

Post by thegreathopper »

I would also double up the cables from your power supply (Gnd and +5 volts) to the Jamma connector, it’s hard to see if there is one or more but one small cable will struggle to supply the current you need.

Good luck.
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Re: Neogeo 4 Slot

Post by gnomx »

Nothing changed.
I've tried to power up power supply but still one working slot.
In bios menu just one slot appears :
Image

If I put original bios same thing.
Just one working slot
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Re: Neogeo 4 Slot

Post by thegreathopper »

What about the other 2 slots.., nothing.
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Re: Neogeo 4 Slot

Post by gnomx »

Anything.
Same.
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