MV-2F Black screen, no boot

douglie007 · Oct 19, 2014

I have a MV-2F board that I think might be a bad BIOS but I wanted to run it by some experts on these things before I spend money for nothing. I tried different carts that I know work ( have a working MV-1F ) but I didnt want to chance messing my working one up by swapping the BIOS to check. I mostly work on home consoles and have no issues figuring out whats wrong but this is my first time trouble shooting an Arcade board ( I also have a wrestlemania with graphical glitches that I think might be RAM ) any suggestions one what to look for would be awesome

HeavyMachineGoob · Oct 19, 2014

Check to make sure hard DIP 7 isn't on, that one halts the CPU.

douglie007 · Oct 19, 2014

HeavyMachineGun said:
Check to make sure hard DIP 7 isn't on, that one halts the CPU.

thank you, I will check this tonight and respond tomorrow.

douglie007 · Oct 20, 2014

HeavyMachineGun said:
Check to make sure hard DIP 7 isn't on, that one halts the CPU.

So the switch was on, but then I turned it off, and turned the system back on, I now have a brighter screen but still doesn't try to boot anything. The red led on the board comes on, but thats the only sign of life

BIG BEAR · Oct 20, 2014

switch 7 is FREE PLAY,switch 8 is the PAUSE so make sure switch 8 is not set to the ON position.make sure switch 8 is off.
BB

HeavyMachineGoob · Oct 20, 2014

Yeah that's right, I was thinking of the wrong hard DIP. 8 is the right one.

douglie007 · Oct 21, 2014

The 8th one was already off, 7 was the only dip on

HeavyMachineGoob · Oct 21, 2014

Yeah you should see about the BIOS now. Although a completely bad or missing BIOS should give a click of death symptom, it's possible your board has an EPROM BIOS and it's lost a bit of data somewhere and now it won't load any games. I can't really think of any other possibilities at the moment. Most boot to black problems are caused by hard DIP 8 being left on.

Atro · Oct 21, 2014

I would definitely go on the bios.
Might not be the case, but it often comes from there, at least from the ones I had here.
Swapped with a good bios and it was ready to go.

hedning · Oct 22, 2014

Maybe the manual can help you? http://wiki.arcadeotaku.com/images/a/aa/MV-2F-Manual.pdf Anyway, good luck!

douglie007 · Oct 22, 2014

I looked at the manual, but I think I can move my bios from my mv-1 to the mv2f for testing, they are both slotted

GadgetUK · Oct 23, 2014

Burn (or buy) a copy of SMK dan diagnostics bios - That might help. If you've got a unibios that might also point out a potential problem.

douglie007 · Nov 3, 2014

the plot thickens, after looking at ever inch of the board I found that the surfacemount chip 89080702 /9133ek702 had pins between 41 and 80 mashed in and touching each other, or I desoldered them and painstakingly bent them back in to place, added new solder and now I have a screen that comes up with " Video RAM ERROR, Address 00000C1B Write 5555 Read 55D5 " is this from the chip that was damaged, and is it repalceable /fixable?

GadgetUK · Nov 5, 2014

Yes, strangely the upper bit there is high when it shouldn't be, but since its not at $0000 then I guess it does look like the RAM. Worth check that chip again I think. I don't recognise that chip number, can you show a photo?

55 = 01010101
D5 = 11010101

I think that address relates to the 62256 Video RAM chips (SRAM). There are plenty of equivalents you can use but they are typically surface mounted.

douglie007 · Nov 5, 2014

this is not my board but thats the chip that was damaged

GadgetUK · Nov 5, 2014

That looks like the NEO-B1 chip! If the pins are all OK on there now and you still get that error I would suspect it could be the Video RAM then as reported. Not sure if thats the 2 chips underneath the quad flat pack (LSPC2) to the right (just below slightly). I think its marked 42256 on the board. I am not 100% sure, just going off the error and what I think are the right chips there.

EDIT: BTW - that battery (top left) looks original! Take that off straight away!

EDIT2: Also looks like it might be leaking on the right side?

bustedstr8 · Nov 5, 2014

It's what Gadget UK said...it will be the ram that has D0-D7 connected to pin41-48 of the LSPC2

douglie007 · Nov 6, 2014

bustedstr8 said:
It's what Gadget UK said...it will be the ram that has D0-D7 connected to pin41-48 of the LSPC2

I am at home now and the chip that was damaged was the LSPC chip, I circled the wrong one, and pin 41-48 is the damaged side. so I need to count up the pins to find the one with the issue? MV2 - 01 is the board, the Mv2F was another one I was working with, I dont think that makes a big difference ( here is the pin out of the chip that is damaged https://wiki.neogeodev.org/index.php?title=LSPC-A0 it has pins 50 - 65 was the bent pins )

GadgetUK · Nov 6, 2014

I think you should be looking at this:- https://wiki.neogeodev.org/index.php?title=LSPC2-A2 It's an LSPC2-A2 I think? In any case, the bent pin there looks to be DOT-A which could have previously shorted to DOT-B or the NTSC/PAL pin. I don't think its related. You need to look at swapping out the RAM chip as bustedstr8 suggested!

GadgetUK · Nov 6, 2014

Just to check, are you saying that pins 50 to 65 were all bent on the LSPC2-A2?

douglie007 · Nov 6, 2014

here is the chip its a A0 no A2

GadgetUK · Nov 7, 2014

Ouch!!! Still think it's the VRAM due to the address referenced.

douglie007 · Nov 7, 2014

GadgetUK said:
Ouch!!! Still think it's the VRAM due to the address referenced.

so I got a better magnifier and there are 2 legs broke on the chip.... so I have to replace it . or can I replace it? I dont know where to get one.

bustedstr8 · Nov 7, 2014

It might still be repairable. You can use a dremel diamond bit and grind away some of the package to get enough space to use jumper wires.

MV-2F Black screen, no boot

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