SNK Neo Geo MVS (Arcade PCB) 6 Slot Repair (MV6) - Part 1

[@GadgetUK164]

Part 2 - kzbin.info/www/bejne/h2i0d56Arch5mqs In the next video I will show you how I did some of the clean up work, and some of the things I didn't get chance to cover properly in this video. eg. CPU clock, monitoring that OE pin on the ROM, and a few other things not well explained. Something else I should point out (just to be accurate) - solder is not just lead, it contains tin as well. Modern solder is obviously lead free! When I said there's functionallity merged with the PRO chips instead of D0, C1 etc - that's not correct. Some of the functions of the C1 and D0 are exploded out to 74 series - that's why there's so much more 74 logic vs say a later MVS board.

[@tbbw]

Awesome, looking forward to it :)

[@AmstradExin]

I wonder if you cleaned the board properly before doing any soldering? Looks kinda dirty, and leaked acid still can cause shorts.

[@VaporEclypse]

I just wanted to say, Thank you!!! Everything I learned to repair pcbs and my neo geo 6 slot board.. is from you! Working on boards for me is like Heaven on Earth. Relaxing.. therapy! Haha. Thanks for sharing your knowledge!!!

[@aphexteknol]

Man you are really getting down and dirty with these Neo Geos Gadget! I’ve learned a lot watching you coax these things back to life. I don’t normally work on stuff nearly this complicated but I may have to try tackling something similar soon and build up my confidence. I know I sound like a broken record, but I can’t thank you enough for the work you put into your videos. Cheers!

[@GadgetUK164]

Cheers =D Yeah, I've got 8 more here ready to upload lol - The problem is there's like 40GB of footage to edit =/ Much appreciated!

[@kimlebrocqu692]

What destruction a leaking battery can do. Nice fault finding and diagnosing Vlog Chris 😁 now I have to wait for ep2 (doh!)...quality as always 😁😁 Kim 😁😁

[@GadgetUK164]

Thanks =D Yeah, battery leakage is a nightmare to deal with =/ Part 2 coming tonight I think!

[@Neffers_UK]

Rest in peace desolder station. When I was a kid and messing with my first soldering iron (25w local market job with basically a flat blade screwdriver for a tip lol), those surface-tension type situations used to bug the hell out of me, I had nothing else, just the iron and solder (I used stripped coax shielding for wick lol). I did a bit of jank to clear them by using one of me mums small sewing needles strapped to the tip of the iron (eye end down) with stripped copper wire and *sometimes* it'd clear when retracting it as the solder wouldn't bond to the needle. But yeah, I doubt it'd work on a ground plane thicker than the chocolate on a chunky kit-kat. Great vid Gadge, love 'em. Props to Furrtek too.

[@GadgetUK164]

Hehe lol =D That ground plane was like a runway - massive lol! Thanks for your continued support my friend =D

[@Neffers_UK]

Am always gonna support you Gadge, love your content, and you're happy to help when possible. Even if peeps aren't a YT giant. There's no snobbery here, and that I appreciate, a lot.

[@Mod_In_France]

As a modder myself, your channel is by far my favorite around...

[@GadgetUK164]

Thanks, very much appreciated =D

[@EngineeringVignettes]

If I am really worried about damage, and I have spare chips, I will just cut the pins at the IC body then heat and pull them one by one. It's a good strategy for quad flatpacks as well, and the quad pins can be sheared off with an exatco knife. It's destructive but can save pads from lifting due to high heat. Cheers, - Eddy

[@GadgetUK164]

Yes, that can be a good idea for sure! I like to try and salvage anything I come across though lol, even crusty corroded 74 logic lol.

[@Heru3005]

Aw man losing that desolder tool gotta be like losing an old friend. Killer repair though, can't wait for pt.2!

[@GadgetUK164]

Thanks! Yes, I was gutted but as time has gone on I realise it was a good decision to get something new. I could always get a more expensive unit later.

[@Four_X]

Nice repair project there Chris, reminds me off the hoops I had to jump through to get my Neo Geo 6 slot up game running. I'm looking forward to part 2 by the way and seeing this thing fire up and play some games. Oh, and may I be the first to welcome you to the Neo Geo 6 slot owners club, Ha.

[@GadgetUK164]

Thanks lol =D I've added a note to let people know about your video in part 2! It's just uploading at the moment and should be available tomoz.

[@39Kohm]

I sad to read that your desoldering tool crapped out, but a good tip for those I got was to put a little wire wool in the collection cylinder, makes cleaning it out 10x easier as the solder sticks to that and can be easily removed. It's been working great for mine.

[@GadgetUK164]

Thanks, wire wool is a great idea!!!

[@kevinwoolford123]

I love these repair videos mate really great to watch :)

[@GadgetUK164]

Thanks =D Hope all is well!

[@kevinwoolford123]

@@GadgetUK164 yeah mate hope you are well also 👍 BTW with my 161 cart I ordered a second and both crash on the same games so its not a faulty cart issue which is odd so Mr Lock is letting me use his still until he tests mine on his unit. Seems to be a timing issue with the 1fz and these v3 carts

[@racer4200]

Cant wait for part 2!

[@GadgetUK164]

Thanks! It's uploading and should be available tomorrow!

[@DanielDavis1973]

8:05 crucible It's amazing to compare that desolder station to a modern one.

[@GadgetUK164]

That's the one!!! =D Thanks! Yes, I've got the review of the Weller replacement coming soon!

[@chingho3842]

WOW. Absolutely amazing. Loved every minute of it. True electronic knowledge and experience non stop. AAAAA++++++

[@GadgetUK164]

Thanks =D Part 2 is uploading now (might be a few hours)

[@TheMadmagik]

Ram clear switch. Probably to delete hi scores/game settings etc without having to go to test mode. Turn game off,hold in switch to kill battery and clear RAM.

[@GadgetUK164]

Yep, that's exactly what it is =D RAM kill switch is more appropriate - if you press it whilst powered up it could cause BRAM to fail with latch up, or you could kill the charge circuit.

[@AdamSommer70]

Very interesting, thanks for sharing!

[@Jayoldstuff1]

fair bit of dammage there from that battery but you'll have it looking like new when its finished, sorry to hear the old Wellor died my Pace hasnt long for this earth either I could fix it but spares are so expensive now and hard to find. think ill be looking at a cheap modern unit to replace it.

[@GadgetUK164]

Yeah, spares nearly impossible to find and to be honest it was really on its last legs due to a number of issues. Too many things needed replacing imo. It was a miracle it lasted so long.

[@juliotattoo]

Hi ! Greetings from Brazil ! Great repair video ! I’m trying to repair a similar board that someone tried to repair before, so , the board im trying to fix is missing those two transistors next to the battery, can you tell me the model of them please? Thanks!

[@GadgetUK164]

I dont have quick access to check these at the moment. Next time I get the 6 slot out I will check! You might be able to see from close ups on the 2 videos?!? Or, just look at the schematics for the MV1F and see what types of transistors were used in that area.

[@juliotattoo]

​@@GadgetUK164 thank you ! i had found them , now im struggling with the watchdog issue 🥲

[@danielm2142]

I have a 4-Slot MVS that has a similar issue due to the backup battery leaking, but with a twist, if I boot it with the cartridge connector daughter-board connected, it watchdogs (never heard of the term, but I like it), if I disconnect it however, it boots with an S-RAM error (understandable considering all the corrosion), with the UniBIOS I can get it to start in AES mode, but considering I have no way of connecting any cartridges, it's just a glorified paperweight, I'll get around to patching up the traces one day, but I guess I'm putting it off due to the fact I hate desoldering chips, particularly when said chips are connected to a massive ground plane.

[@GadgetUK164]

You should probably get a 27C1024 with a copy of SMK Dans diagnostic ROM on it, replace the BIOS with that and use the diagnostics to help you work out what needs replacing (BRAM by the sounds of it?) first. The problem on the top board is likely a failed 74LS (or 74AS etc) 245 on the P (program) interface. I've got part 2 uploading now, towards the back end of that video I show how you can tell which chips related to what on the top board. It might be a case of removing all of the 245 chips related to the prog data bus and re-introducing them as you test out each slot. There could be other causes too, but that's my guess. It could also be the 245 chips on the bottom board related to the prog or data bus too.

[@GadgetUK164]

Or maybe an addressing fault related to 74LS244 chips (on the top or bottom - if there are any on the bottom).

[@johnandrews2167]

I haven't seen a desoldering iron like that before. Interesting.

[@GadgetUK164]

=D It's OLD lol. I show it a little more in the review of its modern replacement (should upload later this week hopefully).

[@banjoguyollie]

nice one. I need to find me one of those

[@GadgetUK164]

Thanks! They do still pop up every now and again on eBay or the Neo Geo forum.

[@DJlegionuk]

I have a question you might be able to answer. On the ELA port do you know how much current the 5v pin could supply ? I am working on a new control board for my led mini marquee and I have reduced the amount of power needed to 170ma so I was wondering if the 5v pin on the ELA port could supply that so I no longer need to take the 5v from the PSU direct if the cabinet is missing the original leads. This makes installing it a lot easier and means I no longer need to crimp 9 way molex.

[@GadgetUK164]

I honestly don't know! I would think the limit would be like half an amp at least probably, but it will be dictated by the thickness of the trace feeding it I guess. I would be surprised if it cannot provide 170mA tbh!

[@DJlegionuk]

I was thinking about taking a look at my 4 slot PCB and working back from the ELA port. My home made prototype worked perfectly at 5v from the PSU, so I ordered some sample PCB and will test it for a while.

[@StRoRo]

26:17- 26:29 have you attended the William Shatner school or dramatic pauses. And why is there a strange repeat of "the ROM there"?

[@GadgetUK164]

LMAO! I never noticed that whilst editing lol

[@GadgetUK164]

Nearly wet myself laughing at that just now!

[@666jamie666]

Hello mate. I have a few issues with my Neo geo MVS 6 slot. Do you do repairs and how can I contact you to discuss please? Thanks Jamie

[@GadgetUK164]

Sorry but I cannot do customer repairs! I just don't have the time and it's always a risk - parts can be hard to find some some systems too. I have very few MVS spares to hand.

[@666jamie666]

@@GadgetUK164 No problem at all. Thanks anyway for the reply and look forward to more repair videos in the future 👍

[@andrewlittleboy8532]

Did you see my previous post in your last video about the Atari Lynx speaker?

[@GadgetUK164]

Thanks! I've just not had a minute to reply yet sorry! Trying to catch up now lol. Thanks for the offer, it is very kind of you, but I've got some of those speakers already thanks!!! =D

[@andrewlittleboy8532]

GadgetUK164 - Retro Gaming Repairs & Mods no problem! Andy

[@danielson9579]

I like it :-)

[@josephnealescratchcards]

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