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SNK Neo Geo MVS Junk Board Repairs Part 2 (MV-1A Z80 Error From Hell)
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- čas přidán 18. 08. 2018
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Another faulty Neo Geo junk board repair - this one has a follow up part. I get it up and running again, but by the end of the video I realise there's still something else causing part of the problem first seen.
Neo Geo Dev Wiki (chip pinouts) - wiki.neogeodev.org/index.php?...
SMK Dan Diagnostic BIOS - smkdan.eludevisibility.org/neo...
UNIBIOS - unibios.free.fr/
#snk #neogeo #repair
Neo Geo Dev Wiki (chip pinouts) - wiki.neogeodev.org/index.php?title=Main_Page
Always good to see you in the process of fixing a piece of tech and you explaining what you do.
Thanks Mark, much appreciated =D
You have the patience of a saint for hunting these pesky hardware faults down Gadget! Hats off to you. I would be a little apprehensive digging that deep into Neo Geo boards like that for sure...
Thanks =D Very time consuming for sure! That's one reason videos slowed down a bit recently - these MVS boards have eaten all my spare time =/
I kinda like Metal Slug with the faulty sound - "DO - do - do - do - do"
Hehe =D
Came for captions, stayed for "2-2-2-2--2-2-2-2--2-2" Haha. You are slowly becoming the NHS of the SNK world at this rate Gadge :D Great vid.
Haha :o) Thanks for the support my friend =D
You're more than welcome mate. I like the way you tackle each board. Yeah you may accidentally go the long way round at times, but that's part of the charm. Most peeps would shy away from the truth and make a vid showing how easy it all was, with Adobe effects all over the shop "all you have to do is..." f**k that noise.
You present the condensed version of your trouble in an honest and easy to digest way. Tis great stuff.
Yeah cause you had so much fun working on beaps Board.
Haha :o) That board was far worse than this one for sure!!!
Oh wow, I can't wait to see what would cause the issue you ran into with the wrong sounds being used. I have a couple suspicions and I want to see how it plays out!
It was quite simple on reflection, but not that obvious!
nice video as always
The one with the ripped-out chip almost makes me wonder if someone assumed it was a socketed chip and applied a certain amount of brutality to it with a chip puller. I've seen that kind of damage done with chip pullers if you grab the socket instead of the chip, so... I wouldn't be surprised.
That's possible I guess! I think in retrospect what someone was doing was trying to fit a UNIBIOS or Diagnostic ROM maybe.
This one seems to be a head scratcher Chris, Looking forward to part three to find the fault. I'm thinking a stuck bit or short on the address bus.
It was painful to fix this one lol! Part 3 is actually the BIOS repair on a 1AX (up tomorrow), and part 4 covers the 2nd half of this repair. Nice guess =D
Great Video and attention to detail. I am also currently working on a Z80 Error from Hell on a MV-1FZS board. I've swapped out the Z80 , YM2610, NEO-D0, SM1, and the Z80 Ram. All obtained from a donor board. I have checked continuity using my meter, as well as using my Oscilloscope to check signaling and my logic probe to check logic as compared to a working 1FZ I have. Still no luck, I don't have a Diagnostic Bios and I am the process of trying to obtain the programmer and EPROM to make a Diagnostic Bios. As a side note I did notice the HC32 in the backup section was producing odd test values as compared to a working HC32, so I swapped that out. Still stuck on the "Z80" error on startup, I have ordered some extra "Z80 - 6" to be on the safe side as I don't know if the Donor Z80 is any good. Any advice you can offer would be greatly appreciated. Thanks again.
Thanks =D The Neo-C1 has some connections I think - maybe you have a fault there! I hope not!
In fact, it does - my next video talks about that. The communications channel runs through the Neo-C1.
Thanks for the info, so I think my next approach will be one of the following: I can use my known working 1FZ and probe the LOGIC on the Neo-C1 to get a baseline, then compare it to my faulty board. Also based on the pinout diagram of the Neo-C1 provided by "Neo-Geo Dev Wiki" I will also check the continuity to the Z80 from the C1 connections. If your interested in the logic values I obtain from the working board, let me know.
Quickchip do a low temp solder for ship removal, i don't think it's super cheap but watching the eevblog review does show it works really well for removing larger, more awkward chips :)
It is quite expensive, though. I think Chris did use it in a few previous vids?
If you search for "bismuth solder", there might be some generic low-temp stuff that could work. I've not tried this myself, as I just use my hot air station, too.
Yes, I've mentioned Chip quik solder a LOT through my earlier videos! That's how I ended up using the flux for nearly everything I do now - best flux around!
@@electronash now there's an idea!
Thanks! I’m pretty sure I need replacement NEO-BUF chips for the NEO-CDD3-1 board inside a Neo Geo CD toploader... I found a short to ground; restored and it still doesn’t work. Boots right up with a known-good NEO-CDD3-1 board.
Can’t wait for Furrtek’s ODE and NG CD BIOS mod!
Furrteks ODE does look cool! He's working on the Fusion 2 as well!
GadgetUK164 - Retro Gaming Repairs & Mods Where can I get info about that? Only thing I see on his channel is the video from a few weeks ago were he demos his ODE, unless he’s calling it “Fusion” now since he did say that it goes deeper than just an ODE. ;) Thanks!
Edit: OK, I found his site and that’s something else I absolutely need from him! $65 is VERY affordable for an MVS to AES adapter. I have a 3D printer too so I’d love to whip up a shell for it!
Sm1 was the chip number on the board 13 wouldn't it have been ram9 where it said sm1 but I could be wrong
Ouch, get some flux dispenser tips. :) A preheater would be nice too, it makes the SMD rework with hot air super easy. What temperature were you using on the hot air station?
Funnily enough I did order some tonight =D It was on my list of things I needed :o) Temperature varies depending on the board and the chip etc. On these boards 375 to 415 typically.
I did some Googling on the Toshiba 84C00AM-6 chip you mentioned as being hard to get a hold of. It seems it's still being made by Toshiba and I found a couple of distributors that say they have them.
www.kynix.com/Detail/198879/84C00AM-6.html
www.utsource.net/itm/p/1097040.html
Mind you I've never used these companies before so I can't vouch for them, but it might be worth a try the next time you need that chip.
What is the shooter game shown at 25:10 in this video?
Razion! One of the NGDEV games - pricey as hell but a great game!
Ive got a Gamegear that I took apart ages ago, its all there just in bits if you want it it's yours I will donate. Do you have a PO Box?
Thanks, much appreciated =D I've got some new Z80's now =D
Fair Do's.
22222222 .. Start lol you know Could of swore it would of been that yamaha chip as well :-/
Hehe =D Yes, I was shocked when the swap didn't affect it too!