MVS MV-1C repair?

Subject: MVS MV-1C repair? Tue May 07, 2013 1:51 pm

Found this on my new MV-1C.

MVS MV-1C repair? Img0719ufw.th

I don't have my power supply yet and don't know if the board is working or not. The wired connections test good with no shorts and are done with enamelled wire. The chip is a 74HCT245A - Octal 3−State Noninverting Bus Transceiver with LSTTL Compatible Inputs. I have no idea what the hell that means. The chip is hooked up to VCC, Ground, Pins 7, 20 and 37 on the NEO-YSA. The component it's sitting on top of is just a voltage regulator.
I was a bit pissed initially, but I do have to say, it looks like good work. Those solder points are tiny as hell and the wire isn't at risk of shorting on anything as the enamel appears to be intact along the entirety of all the wires. If all is well, I'll just maybe secure the wires somehow so they don't accidentally break.

I can't find a datasheet for the NEO-YSA or a circuit schematic for the MV-1C anywhere, so I'm a bit stumped.

Any thoughts? Ideas? Suggestions?

Subject: Re: MVS MV-1C repair? Tue May 07, 2013 4:20 pm

I'm seeing what looks like bridged pins. Get the datasheet for the chip and look at how it works, then compare that to how it's wired.

Subject: Re: MVS MV-1C repair? Tue May 07, 2013 10:25 pm

http://pdf1.alldatasheet.com/datasheet-pdf/view/172607/ONSEMI/74HCT245A.html

I had a look at it already, but digital electronics logic is still a bit foreign to me. It's a big NOT and NAND logic gate?

Subject: Re: MVS MV-1C repair? Wed May 08, 2013 11:56 am

Grambo wrote:: http://pdf1.alldatasheet.com/datasheet-pdf/view/172607/ONSEMI/74HCT245A.html

I had a look at it already, but digital electronics logic is still a bit foreign to me. It's a big NOT and NAND logic gate?

Haha, this's above me too.

Subject: Re: MVS MV-1C repair? Wed May 08, 2013 12:26 pm

Well, at least I don't feel like a complete idiot then.

Guest

Wow that is really something there. I hope you did not pay more than $50 for that even if it does end up working. If you did I would complain and send it back even if it does work. That is a super shitty hack job of a repair, probably one of the worst I have seen on a Neo-Geo PCB.

Also I don't know if you have seen the NeoBiosMasta adapter for the MV1C. It allows for an easy installation of a Universal Bios without having to go through the tedious process of tinning and soldering a bunch of wires. You can also do it without fully removing the old surface mounted BIOS.

You can buy them over at Jamma Nation X

http://www.jamma-nation-x.com/jammax/store.html

Here is a tutorial on how to install them.

https://www.youtube.com/watch?v=_3mHf02_9VM

Subject: Re: MVS MV-1C repair? Wed May 08, 2013 8:35 pm

Skips wrote:: Wow that is really something there. I hope you did not pay more than $50 for that even if it does end up working. If you did I would complain and send it back even if it does work. That is a super shitty hack job of a repair, probably one of the worst I have seen on a Neo-Geo PCB.

Ah, I'll see if it works and then clean it up afterwards. It's mounted firmly, so it should look good with some proper wire and some clean shiny solder.
I was pissed at first, but at the same point, maybe it was for something that was dying and if the PCB did die on me, I feel like I'd have a hard time diagnosing this one.

Skips wrote:: Also I don't know if you have seen the NeoBiosMasta adapter for the MV1C.

Already got one Smile

Subject: Re: MVS MV-1C repair? Wed May 08, 2013 10:31 pm

I'd be pissed regardless just for the seller not mentioning it. It's not like it's something he could have missed.

Posts : 571 Join date : 2012-03-04

Drakon wrote:: I'd be pissed regardless just for the seller not mentioning it. It's not like it's something he could have missed.

sometimes a repair is nessecary on these boards. My 6 slot has a few wires on it to repair dead traces. thats usually all its for just jumping from 1 pin of 1 chip to 1 pin of another to correct a broken trace. these boards have been tossed around in warehouses for the last 20 years and traces get scratched.
i see a lot of it and i dont worry much about it as long as the board works.

but it looks like those wires are bare! thats just stupid if they are.

Posts : 17 Join date : 2014-12-14

That looks like a fire hazard.

Subject: Re: MVS MV-1C repair? Sun Dec 14, 2014 1:55 am

Electric Zombie wrote:: That looks like a fire hazard.

Please elaborate, how so?

Posts : 17 Join date : 2014-12-14

Drakon wrote:

Electric Zombie wrote:: That looks like a fire hazard.

Please elaborate, how so?

I was joking. However, bare, loose wires obviously invite the potential for a catastrophic short.

Subject: Re: MVS MV-1C repair? Sun Dec 14, 2014 10:56 am

Electric Zombie wrote:

Drakon wrote:

Electric Zombie wrote:: That looks like a fire hazard.

Please elaborate, how so?

I was joking. However, bare, loose wires obviously invite the potential for a catastrophic short.

I don't think that's an exposed wire. It's a very tiny wire but I think it has a plastic coating.