MVS-1C Crosshatch screen games won't load.

black_7 · Feb 27, 2009

I recently got a supergun. It works fine but when I hook up my mvs-1C to it I get a crosshatch screen and the games won't load.

I looked up crosshatch screen, did some research on the probelm and found out this problem usually happens when the battery has leaked onto the motherboard and corroded it.

I took the plastic covering off mine and found absolutely no corrosion. The whole thing is clean and there isn't any damage I can see.

If any of you have ever run into this problem and can give me any assistance. I would be very grateful. Thanks in advance.

Hewitson · Feb 27, 2009

How is your +5v?

black_7 · Feb 27, 2009

It should be fine. I've been playing other boards on the supergun. Can the +5v line be bad and the Atomiswave still works on the it?

Macck · Feb 27, 2009

Try search for the missing little things like these small resistors....check the baterry voltage....and finally try test all the conectors pins....maybe you can fix this problem whit a simple things....

[]'Macck

channelmaniac · Feb 27, 2009

The MV1C board does not suffer from the "crosshatch of death" like the MV4 board does.

If you have a crosshatch of death on it then you have:

Dirty Cart
Dirty Slot
Broken address line on cart slot
Broken data line on cart slot

black_7 · Feb 27, 2009

Well... It can't be the motherboard. It's never been used until now. I'll try cleaning both the cart and the motherboard. I have to get the supplies and I'll check back here with the progress in a day or two.

God I hope it isn't broken address/data lines.

Xian Xi · Feb 27, 2009

I'm pretty sure it's a dirty cart. Use an eraser on it.

xiao_haozi · Feb 27, 2009

Xian Xi said:
I'm pretty sure it's a dirty cart. Use an eraser on it.

Yeah I've gotten this same thing on my 4slot when I had carts even after an initial cleaning. Took another q-tip with alcohol to it and still found it to be dirty...let it dry and you are golden. Also, have you made sure it's seated properly (I assume so but thought I would throw that out there)?

Hewitson · Feb 28, 2009

black_7 said:
It should be fine. I've been playing other boards on the supergun. Can the +5v line be bad and the Atomiswave still works on the it?

Yep. Some boards will happily run with as little as 4.5v. Others won't run with the voltage a hair under 5.1v.

Different boards have different voltage drops across the board. The chips at the far end of the board will be running off considerably less voltage than the ones right near the JAMMA connector.

channelmaniac · Feb 28, 2009

black_7 said:
Well... It can't be the motherboard. It's never been used until now.

Famous last words.

SNK had some shitty manufacturing processes on the MVS boards. I've seen a LOT of bad traces & plated thru holes over the years. A spot of gunk gets left from manufacturing and it eats right through the copper.

You can tell it's manufacturing when it's left in a single hole and no other hole has the stuff in it... or it's on the board and when you flick it off there's no green conformal coating under it.

black_7 · Feb 28, 2009

Alright. I cleaned my motherboard and all the carts I have.

The first cart I put in there was a used RB2 I got off ebay. It was FILTHY. I opened up the case and the pcb was caked in dust. The cotton swab I used was pitch black.
It had to be bad because all the other carts I put in there, even a never used one, wouldn't work after that.

I cleaned it and the carts and everything works fine now. But the used RB2 had garbled sounds when I put it in. Plus when I accidentally moved the board notch a green screen and garbled graphics appeared.

I restarted it and the sound and graphics looked fine. Everything seems to be alright now. Thank you all for your time.

xiao_haozi · Feb 28, 2009

black_7 said:
Alright. I cleaned my motherboard and all the carts I have.

The first cart I put in there was a used RB2 I got off ebay. It was FILTHY. I opened up the case and the pcb was caked in dust. The cotton swab I used was pitch black.
It had to be bad because all the other carts I put in there, even a never used one, wouldn't work after that.

I cleaned it and the carts and everything works fine now. But the used RB2 had garbled sounds when I put it in. Plus when I accidentally moved the board notch a green screen and garbled graphics appeared.

I restarted it and the sound and graphics looked fine. Everything seems to be alright now. Thank you all for your time.

Yeah if you touch the carts while they are in and the system is running you will often crash it out like that. Sometimes you might load in a new round of games in your multislot and realize when you select for one it skips over or is garbled a bit... if you slightly move the cart a bit and turn back on it usually goes unhitched.

I don't know about anyone else, but I generally clean my carts every time I throw one in.... probably pretty overkill but I figure it can't hurt and will hopefully keep my edge connectors in my mvs board cleaner.

Xian Xi · Feb 28, 2009

Sounds like a cold solder joint on the cart. Open it up and check the M1 and V chips for broken solder joints.

kruuth · Sep 29, 2009

I'm having this problem. I've cleaned the board and still can't get things going. I've got the crosshatch, no matter what I do I get the crosshatch. I've taken the cart apart and cleaned it but have had no luck. Can someone help me out?

channelmaniac · Sep 30, 2009

Richardson? As in Texas?

If so, drive it over here and I can hook it up on my testbed. I'm over in Lewisville.

RJ

Xian Xi · Sep 30, 2009

It's probably that cap or resistor near the left side of the slot. I had one that was missing so the board kept doing the crosshatch.

Bring it to RJ though.

segasonicfan · Jan 31, 2010

I'm having this problem on 2 MV-1 boards. Both boot to cross hatch and OK the memory card, and I've tried swapping a regular US bios and a Unibios 2.2. One of the boards tries to boot when a game is loaded but just flickers graphics like on the original bios startup. The other does absolutely nothing when turned on with a cart inside, just goes to crosshatch.

I've tried multiple games now and all connectors are clean. I've also replaced the batteries which didn't have any corrosion either. Does anyone know what chip handles the booting on an MV-1? I could try swapping or replacing across the boards perhaps.

both boards have had some repairs in the past and have seen better days. nonetheless, i don't have much money right now and would like to fix at least one of them..

note: I have an MV-1B that boots fine with the same games, so it's def the MV-1 boards

Xian Xi · Jan 31, 2010

If it's a constant flicker then it's in watch dog. You would need to make sure there is 100% connectivity between RAM>CPU>Bios.

If it's like green then it's the calender crystal going bad, probably corroded.

segasonicfan · Feb 1, 2010

Thanks for the reply. I fixed one of them (the flickering one), turned out to be something simple. The other one just goes to cross hatch when a game is plugged in or not. I've re checked all the traces and there isn't any corrosion anywhere.. very frustrating. I wish I knew what to look for/at :/

Hewitson · Feb 1, 2010

When you say you have checked all traces, do you mean visually or properly?

Check connection between the CPU and the cart slot. I assume you've already cleaned the slot and the cart.

channelmaniac · Feb 1, 2010

Hewitson said:
When you say you have checked all traces, do you mean visually or properly?

Check connection between the CPU and the cart slot. I assume you've already cleaned the slot and the cart.

+1 on the connections between the CPU and the cart slot.

If the system can read the program ROM on the cart then it will load it and run the game. You can even put just the one program board from the cart in the system and it'll run fine with no graphics.

In other words, the only thing that would make the cart not run would be a program ROM that can't be read.

Backtrack from the program ROM on the cartridge board to the card edge connector then to the MVS board. Look for the bad connection or trace.

It could be corrosion on the cartridge slot. Take a magnifying glass and a bright light to look in the slot for gunk on the connection fingers. They should be shiny and gold, not green or brown.

Next, check the connection between the upright board and the main board on the MV-1. Are any pins bent or corroded?

After that, look at the board top & bottom with a bright light and magnifying glass. All it takes is one tiny tiny gouge in a program ROM address or data line to cause the crosshatch of death.

RJ

Razoola · Feb 1, 2010

If you have a unibios then using the memory viewer from the crosshatch can quickly show problems with what the cpu is seeing in the program ROM space. scroll to address 0x100. On the right you should see 'NEO-GEO' written with the corrosponding hex values of 0x4e45 0x4f2d 0x4745 0x4f00. If this does not match then from the vaules you see you can track what traces may be broken.

segasonicfan · Feb 1, 2010

Razoola, very good suggestion, I used the unibios and took a pic of the section:
http://i18.photobucket.com/albums/b134/Segasonicfan/100_4224.jpg

When I scroll up a lot of the values start changing, there's a lot of funky stuff. Makes me wonder if the problem is fixable at all.

The cart slot and board connection are not likely to be the issue, as I mentioned before I swapped the cart connector PCB with my other MV-1 and it tested fine on the other system. So the problem has nothing to do with cart connection. This board has very little dust and no errosion and I used a multimeter to follow traces as well but everything has checked out so far. Hopefully these hex values will mean something and give me a direction to look.

Razoola · Feb 2, 2010

what game are you using when you took that picture?

Razoola · Feb 2, 2010

Ok... I have worked out the game is 2020 superbaseball and I can see the problem.... Data line 3 (0x0008 vs 0x0000) is sticking on randomly by the looks of things. This could be the result of a bad connection to the cart or a cold solder joint.

For example address 0x102 should be 0x4F25 and not 0x4F2D

MVS-1C Crosshatch screen games won't load.

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