Solved Neo-Geo 4 Slot no sprites

[Retroman839]

I didn’t

I'm not trying to be mean, we all started out like this. That custom chip could be saved with a lot of time and work, but it was years before I was comfortable working on surface mount stuff.

The right tools, watching some youtube videos and some practice will go a long way, not sure what iron you're using but a temp controlled one and a few different tips would help a lot too.

I take everything you say
On board …
I think I can save it / and I will continue to work on it .

I’m actually happy that it’s at the state it is as it was worse ..
I think I have lost a pad
And a trace .. but I think I could Use a trace wire to fix that .. that’s the plan or

Leave until I’m confident enough to remove it all ..
Repair pads ..

 

[Georgian2]

Swapping the NEO-ZMC2 did bring all the sprites and background back.
Still some thin lines here and there and some randm pixels flickering....

 

[Retroman839]

Swapping the NEO-ZMC2 did bring all the sprites and background back.
Still some thin lines here and there and some randm pixels flickering....

Did you check you have good ground ?
Maybe try adding another ground direct just to see if it’s A ground issue ?

Could be a slot issue.

Fancy doing mine ?
Can sendcsome spares 1 slots with it for you

 

[Georgian2]

I found an broken trace from the CN8 to the Neo-253 an C5. Patched it and everything looks great so far. I noticed that the voice and effects sounds are not as loud as the music that plays during the game. I'll see what I can do about that.
Found reproduction for the neo-zmc2 on furrtek.org
Job done here.

 

[Retroman839]

I found an broken trace from the CN8 to the Neo-253 an C5. Patched it and everything looks great so far. I noticed that the voice and effects sounds are not as loud as the music that plays during the game. I'll see what I can do about that.
Found reproduction for the neo-zmc2 on furrtek.org
Job done here.

Sweet 👍😎well done

I have 3 4 slots just got cross hatch ..
I’m scratchin my head

I think it must be the ic that communicates the socket to the cpu …
All bottom boards pass diag no issues

 

[Georgian2]

Sweet 👍😎well done

I have 3 4 slots just got cross hatch ..
I’m scratchin my head

I think it must be the ic that communicates the socket to the cpu …
All bottom boards pass diag no issues

Could be many issues. Dirty slots and so on.


Looking at the mvs schematics i see that its got stereo sound. My speaker is connected between the L and R not between GND and Mono. This could be the reason my voice and effects are not as loud. I'll see tomorow.

 

[Retroman839]

Could be many issues. Dirty slots and so on.


Looking at the mvs schematics i see that its got stereo sound. My speaker is connected between the L and R not between GND and Mono. This could be the reason my voice and effects are not as loud. I'll see tomorow.

Deoxit gold all my
Slots .. cleaned ..

Also all the female and male
Connectors mate top and bottom board together .. ..
Cleaned. No change.

Yes I made a stereo harness
For mine off the 4 pin headphones connection

 

[patzik]

I did repairs on a 2 slot that had a lot of battery damage, had to repair a whole bunch of traces, and ended up needing 2 neo-257, one neo-g0 and a zmc2 replacement by furrtek. Gave the board a good service, installed coin cell and replaced all caps (which are a lot).

 

[Retroman839]

I did repairs on a 2 slot that had a lot of battery damage, had to repair a whole bunch of traces, and ended up needing 2 neo-257, one neo-g0 and a zmc2 replacement by furrtek. Gave the board a good service, installed coin cell and replaced all caps (which are a lot).

View attachment 36884View attachment 36885View attachment 36886

Thats is a lot ..
Replaced by furrtek , ?
You purchased the chips from him ? And installed them your self ?