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roy

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hey
bothe slots has vertical lines, 2 slot has no audio (jamma or 3.5mm stereo)
the pcb looks good no acid or noticable damage
tried recapping,slots were brushed and also inserted credit card with alcohol towel
tried 6 different games with stock and unibios 4.0
no chnge...
thanks
 

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Rom1

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Have a look at ZMC2 and multiplexer next to it.
The same goes for the sound: might just be a dead G0.
 
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alexcom

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Check the outputs of the Neo-257 at J-2.5 and K-2.5 with a logic probe. Once you rule that out, it's definetly the neo-zmc2 or a trace that goes to it from the neo-257.

For the 2nd slot audio, it's the unibios 4.0 the isssue... try the stock bios.
 
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Rom1

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Yes right, with Unibios 4.0 sound on slot 2 only works when another cart is in slot 1
 
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roy

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Check the outputs of the Neo-257 at J-2.5 and K-2.5 with a logic probe. Once you rule that out, it's definetly the neo-zmc2 or a trace that goes to it from the neo-257.

For the 2nd slot audio, it's the unibios 4.0 the isssue... try the stock bios.
thanks about the sound answer. spot on...
will check the video once I recieve logic probe
 
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