Neogeo 6 Slot weirdness....

[glstar]

Hi.
I got a 6 slot that have a rellay strange behaviour….
It works with some games while on some Others it won't and gives graphics error...this in all slots.
For example puzzle bobble works fine while neo turf master doesnt.
https://youtu.be/Bhm04r-vbmg
https://youtu.be/hJ2cq1090v4

I see that the problem is related to the upper board, since i used another upper board and this problem doesn't appear.

I've never seen such a problem.
Someone knows what the problem could be?

 

[Mitsurugi-w]

Some rubbed traces under the cart slots most likely.

 

[glstar]

Some rubbed traces under the cart slots most likely.

Strange is that with some carts I don’t have that problem.....

 

[streetfighterken]

I've had the same issue. Edge connectors and slots need to be spotless. Use Deoxit.

 

[CB_of_Luton]

I've had the same issue. Edge connectors and slots need to be spotless. Use Deoxit.

I've had similar problems and it was either bad alignment of cart in slot or as streetfighterken said above-

 

[glstar]

I've had the same issue. Edge connectors and slots need to be spotless. Use Deoxit.

I've had similar problems and it was either bad alignment of cart in slot or as streetfighterken said above-

I tried today to polish and clean the carts and the slots, but nothing change.
I see that there is a repair done on the left are (looking the boards from 1-2-3 etc slots…).

I tried to cut the wire and now all i got is the crosshatch...so something there should be the problem.
Any hint?