Amiga 500 Plus motherboard I bought for scrap, but can it be fixed?

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I found myself in need of an Amiga ECS chipset so the best place to find one of those is inside an Amiga 500 Plus. This one came up for sale on one of the various discord servers I frequent and with the extensive battery damage it looked like a prime candidate to use for parts.
Its been sitting in a box for the last month or so and temptation finally got the better of me... I have to know if it can be fixed, so lets try to fix it!
Diagrom - www.diagrom.com/
Diagrom download page - www.diagrom.com/index.php/dow...
Amiga PCB explorer - www.amigapcb.org/
Amiga Vector schematics - www.amigawiki.org/doku.php?id...
Lemon Amiga error codes - www.lemonamiga.com/forum/view...
end theme - A Prehistoric Tale (1990) main theme by Jochen Hippel
CRG twitter - / yt_crg
CRG patreon - www.patreon.com/user?u=139190...
Chapters
00:00 Intro
01:23 Inspection
03:07 Stripping down
07:22 Look at that mess
09:20 Whats broken?
12:13 Repairing a broken trace
14:06 Tinning the copper
15:37 Cleaning and testing the logic
18:51 Refitting the chipset and first test
21:36 Testing the chipset
23:22 Diagrom
27:26 Lets just double check that logic
33:13 Conclusion and credits

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8 июл 2024

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Комментарии : 123

@nickolasgaspar9660 7 месяцев назад

Lets be honest.....having the ECS chipset was one reason you bought that board. Trying to fix it was the cherry on top! Who could ignore such a challenge!

@CRG 7 месяцев назад

The ECS chipset was the only reason I bought that board but as you say who could turn down the challenge. It has since been put out to pasture though, the chipset now lives in my A2000EATX and the board is just being used for spares.

@Arivia1 Год назад

I love the way this video starts. I’m not gonna fix it I’m not gonna fix it…oh hell.

@PJBonoVox Год назад

Where are you my man? Sunday mornings aren't the same without one of your videos.

@nicoful86 Год назад

I gotta say that absolutely loved the tip about using a saturated piece of wick to coat the exposed copper! ❤️

@CRG Год назад

I found its the best way of doing it to just get a thin coat of solder.

@michaelcarey Год назад

Your dedication to the repair is admirable! I'd take the easy way out and buy a replica PCB 🙂

@CRG Год назад

Thanks, the chipset will be going to a replica PCB soon but I just fancied the challenge of trying to fix it.

@KorAllRBare Год назад

**TIP** I was going to suggest " single inline IC socket " where you just cut them to length and marry them to the IC and "Solder TACK" the four corners in place, remove the Chip and solder the Socket into place, but after watching the video I see you are aware of them.. APU I dropped a 👉👍👈

@CRG Год назад

Yes those are handy for repair work such as this and while not in the video I fitted them exactly as you say.

@esc2dos Год назад

Brilliant. Intro was priceless. Really enjoy your wit. Great info and a cautionary tale, can't always trust the results of the tester. Intermittent electronics issues are nightmare fuel.

@CRG Год назад

Thanks, glad you enjoyed it. I think ultimately the chip was just border line working when I initially tested it but enough for the tester to pass it. Perhaps the stress of being soldered again finally killed it. Maybe the lesson here is to just fit sockets so its easier to swap out parts if I needed to.

@esc2dos Год назад

@@CRG Really makes you ponder what the failure is in these "solid state" parts. Is it a mechanical failure, perhaps the heat separated a connection, lifted a tiny lead. Would freezing it temporarily restore it? So many questions so little time. Thanks again.

@emlyndewar Год назад

It was a stretch for the algorithm to recommend this, but I’m glad it did. Serious amount of work in this video. Super interesting!

@CRG Год назад

Glad to hear you enjoyed it. The algorithm seems to be doing strange things lately with us smaller youtubers but happy to have you here. Lots more similar repair and build projects to come :)

@TheSudsy Год назад

Another legend saved from the scrap heap - but condemned to obscurity.. lol

@YogSothoth1969 Год назад

o7 Commander :-) How cool is that, you got the whole machine running again, respect! Keep on your good work!! Greetings Michael (aka CMDR RORY MACNAB)

@cackoocacho1629 Год назад

30:06 This is where we need the classic "Oh, yes. OH... YES!" with the finger waving at it. 😆 Nice job in getting that thing going. Wow. It looked absolutely awful.

@andreas3883 Год назад

I love this video. It's so right to save theses boards. I just want to leave one hint. Many of these old chips can easily be killed by touching it. So I'm not wondering about the inconsistent results of your tester.

@CRG Год назад

Thanks, glad you enjoyed it. You are speaking of ESD damage to chips? Personally its not something I've came across before although granted it is a problem and very well may have been the cause of that chips failure here. It was very green from corrosion though so I do think that was the more likely cause. That said though I have since gotten one of those wrist straps which should deal with any potential ESD going forward.

@deborahberi3249 Год назад

Made for a great Video! With all the work you put in I thought I was watching a Chris Edwards Repair Video, lol. -Mark.

@CRG Год назад

Chris who... LOL I'm just joking. Chris has some excellent videos on repairing these old machines. Not sure I could tackle an A3000 like he has. Glad to hear you enjoyed this one.

@jaybenton7716 Год назад

I used a small allen key to remove a similar chip in my Atari ST. They're perfect because of the small bend and a decent one is strong enough to do the job. Just took my time lifting a bit from one corner, then the other.

@CRG Год назад

That was my plan with the tweezers but the chip was really stuck in the socket. I cut it from the video to save time but it took some pulling to get the chip out when the new plcc extractor came.

@LeftoverBeefcake Год назад

@@CRG On some earlier boards there were holes under the Agnus socket so you could pop the chip out from below, I'm very surprised the 500+ (rev 8a board I think?) doesn't have those holes.

@CRG Год назад

No holes on the rev 8a I'm afraid. The rev 5 certainly has them and they are helpful for getting a tricky chip out.

@cathers1 Год назад

What a great video. It's inspired me to look at a similarly damaged A2000 board I've had hanging around for a while. Enjoyed your Spectrum repair videos too!

@CRG Год назад

Thanks and good luck with your 2000. Please let me know how you get on with it. Always great to hear of another machine getting saved.

@mark12358 Год назад

BRAVO! Another nice job to see from you. Just looking forward for the upcoming project, then.

@CRG Год назад

Hopefully you'll enjoy the big build project, all being well it'll be out in 2 weeks.

@mark12358 Год назад

@@CRG I bet BIG in all senses. Cheers!

@da1otta Год назад

Well done! Skill, patience and knowledge in action.

@CRG Год назад

Thank you very much!

@Wormetti Год назад

Great work repairing the board. Doing it just to see if you can, makes it even better to watch.

@CRG Год назад

Yeah I could have easily just taken the customs and binned the board but where's the fun in that. Better to challenge myself to fix it and at least in doing so I've learnt something about the board and how it works.

@dorfschmidt4833 Год назад

Icing on the cake would be a proper yellow UV cureable soldermask.

@MrFixiit Год назад

nice job craig you did the right thing repiaring it another feather in the cap i have a feeling you going to get one of those newly made 500 boards and build one cant wait to see what you going to do with the chipset.

@CRG Год назад

The big project will be a newly made Amiga but not one of those 500s. No spoilers though 😉

@mark12358 Год назад

@@CRG Wow. I wonder and guess in silence, then.

@oleurgast730 Год назад

@@CRG I would like to see an A2000+ EATX... (A2000 with ECS and 2MB Chip-Mem). I plan to build such a project myself, but in a few years as I have not the skills for SMD now - and anyway want try my luck with an A2000 "normal" (exept beeing purple and with 70µm copper instead of 35µm) replacement board first (I have one defect A2000 Rev 4 and 2 defect A2000 Rev. 6.2 with massive batery leakage, but all custom chips worked in an A500 (exept of course I could not test Buster this way)).

@asmithau Год назад

Well done mate. I was happier than you when the machine came up. Love videos like this, you learn so much!

@MarcLuscher Год назад

wow - what an emotional rollercoaster !

@gregcoons7308 Год назад

love the bluetack trick! I'm always wishing I had an extra hand or two. This will really help out.

@CRG Год назад

Yes it really helps to just keep the wire still while you solder it.

@dwacek Год назад

Awesome job, seems you should find another donor board for the project and keep this one alive, but hey! that's me...

@alanhaynes4576 Год назад

Awesome video and you have given me the courage to fix one I have. Please keep those videos coming.

@CRG Год назад

Good luck fixing your own board. Please let me know how you get on.

@alanhaynes4576 Год назад

@@CRG Haven't you ever heard of "the luck o the Irish?" My Grandmother was Irish and lived in Shankill Road in Belfast. I will certainly have a go as it did not suffer as much damage as that one you fixed. and all the Custom chips work as I have tested already in my other board. I think it could be just a trace under the Gary but who knows. I will let you know how I go and may your days be as long as the beard on Paddy McGinty's goat.

@walterbeer2386 Год назад

Impressive work!

@CRG Год назад

Thanks

@MrLukealbanese Год назад

I nearly bought that A500+ board Glenn, but I'm bloody glad you did instead 😁😁😁. Time you built a retro chip tester methinks. Brilliant video.

@CRG Год назад

So am I because I really need the chipset for the other project 😂. A retro chip tester I think is an absolute must. I need to look into getting one put together.

@TheMalMeninga Год назад

This is the first video I've watched of yours and it didn't disappoint. Excellent work!

@CRG Год назад

Thanks, glad to hear you enjoyed it.

@weepingscorpion8739 Год назад

It's probably not it but: Amiga 500++? In any case that what I was thinking throughout this video. Anyway great video as always. Keep up the good work. :)

@CRG Год назад

Good guess but no its not an A500++. I just have one other thing I want to look at first then I'll be getting stuck into the big project. No spoilers though 😉

@weepingscorpion8739 Год назад

@@CRG Oh I will definitely be staying tuned then.

@georgehunter2124 Год назад

Well done, 2 or 3 hard shift put in but you got it at the end

@CRG Год назад

Thanks, it was great to see it boot even if the chipset will be getting salvaged for another project.

@8BitRetroJournal Год назад

Great video! Good work on debugging the problem.

@CRG Год назад

Thanks, it took a little help from some folk in the community but very happy to see it booting in the end.

@wskinnyodden Год назад

Say a prayer to the "Magic Blue Smoke" God of electronic components!

@Mind-your-own-beeswax 5 месяцев назад

Great job fella. Good job you know your onions

@runcmd8851 Год назад

Great repair i think i was looking at this board on ebay a couple of weeks ago.. glad it was saved for another project.

@MichaelEhling Год назад

33:10 That was unexpected and funny. LoL (actually). 😄

@miked4377 Год назад

unreal......the second crazy chase board.....or should i day crappy logic chip....well i enjoyed watching!glad you fixed it!

@technretro7115 Год назад

Great fix👏🏻 An a500 i bought from ebay as not booting ended up being an issue with Agnus, or more accurately the Agnus socket. Someone had cracked the two socket corners getting Agnus out sometime in the past. The amiga was booting to a white screen. The usual blink on screen at the beginning then flat white. To test a put a plastic wire tie around the socket and tighten it up and booted fine. Cut off the wire tie and white screen again. Replaced the socket and happy days. I really enjoy the videos and delivery style👍🏻

@CRG Год назад

I've heard of that happening before and while not in the video I did check my socket but its good.

@Breakfast_of_Champions Год назад

Solid job! I'd probably have wasted a big blob of Amtech flux to clean the burnt area but just scraping worked just as well.

@MikeyGRetro Год назад

Nice repair. Yep I get halfway sometimes and think why am I doing this. I’m looking forward to what your going to be doing with it. 👍🏼

@RetrogradeScene Год назад

Great job! got lots of tips from this!!

@CRG Год назад

Thanks, glad you found it useful.

@ddniUK Год назад

Enjoyed the video Craig. Good job.

@CRG Год назад

Thanks although my names Glen. Weirdly I've been called Craig 3 times in the past week 😂

@ddniUK Год назад

LoL I know that too! Was influenced by the other comments. Also CRG = CRaiG.

@CRG Год назад

@@ddniUK I'll get myself a name badge for the next video 🤣

@104d_3rr0r_vince Год назад

1:06 I know that feeling...

@force4200 Год назад

Great! I just put out a video when i repair a A500+ :)

@CRG Год назад

Thanks

@envoycdx Год назад

Just stumbled on this, subscribed, look forward to seeing other videos.

@CRG Год назад

Thanks, very kind of you to say so. I've got lots more similar repair and build videos planned including something special for the chipset from this board.

@envoycdx Год назад

Just working through your 486 build videos. I had a 486 dx50 given to me recently which has been kicking my butt trying to get it grafting again. Making headway now though. Look forward to the repair videos

@envoycdx Год назад

Oh and thr build videos :)

@iamdkk Год назад

What a save :)

@CRG Год назад

Thanks, it took some work but just happy to get there in the end.

@iamdkk Год назад

@@CRG you have way more patience, tenacity and lust for pain than I could ever hope for 👍🏻

@benjaminwirth5192 Год назад

Nice one🙂 Always.

@CRG Год назад

Thanks

@VeryWarmBear1 Год назад

I have found Tarn-X cleans connectors and IF pins quit well rinse with water and dry. Does not remove any metal. Have been doing this for repairs and pulls since 1980. Occasionally if the leg is corroded thru that chip cannot be saved.

@CRG Год назад

I'll look into that, thanks for the tip

@10MARC Год назад

Fantastic repair! I would have given up after first looking at it.

@CRG Год назад

Thanks. It was a lot of work but so satisfying when it came to life and of course worth it for the experience.

@UpLateGeek Год назад

I am curious about how reliable this would be over time. My guess is with that much corrosion, it's impossible to get 100% of it, so it wouldn't surprise me if you see some spots of corrosion start to appear again.

@Stefan_Payne Год назад

Aren't there any new Replacement PCBs available for this Situation? That might be the best way to go in the future, just that and some hot air to remove the old components (does someone make nozzles to remove DIP Packages for Hot Air Stations?)

@CRG Год назад

There are and I do have a new Amiga board to build for which the chipset from this board will be used. I just wanted to see if it could be fixed.

@volkerwinkler6121 Год назад

For replacement of the agnus I've been using a special PLCC tweezer, but even with the tool it has been hard. Sockets can also break in case of low quality plastic.

@tenminutetokyo2643 Год назад

244N yeah! I just jammed a brand new one in my Trash-80 Color.

@VeryWarmBear1 Год назад

Sorry IC pins from previous comment .

@ricdintino9502 Год назад

Don't destroy those beautiful tweezers!

@CRG Год назад

It took ages to bend them straight again. Lesson learnt and I now have a new proper PLCC extractor.

@zero0ryn Год назад

Nice one Maybe you need to build the retro chip tester. like Adrian's Digital Basement.

@CRG Год назад

Yeah one of those would be ideal. I'll need to look into it.

@mal2ksc Год назад

I agree that it would be a nic8e thing to have, but I'm not sure it would have made any difference in this case. I bet that chip would have tested good in anything, because it WAS good. But perhaps a bonding wire between the silicon and the package was broken and reconnected by touching, and sort of welded itself in place once there was current. It wouldn't take a very hard shock to break that again. The only way to catch that would be to bang on the chip during the test. I'm not sure that's worth the down side, breaking chips that weren't going to break otherwise.

@mc0burn Год назад

What are those shelves you're using for the C64, A1200 etc?

@CRG Год назад

They are from ikea - www.ikea.com/gb/en/p/mosslanda-picture-ledge-white-90292103/. I put a small wedge under each to add a bit of strength but them have been holding strong for a couple of years now.

@mc0burn Год назад

@@CRG good old Swedish meatballs. Thanks.

@Hellrun Год назад

Is this upcoming project going to include a checkmate case by any chance? :)

@CRG Год назад

Unfortunately not, it's not compatible with that case although I will need to get a case for it.

@Hellrun Год назад

@@CRG I'm pretty sure you can house an A500 in it. I think there is a video on the RMC channel with an A500++ build using a checkmate case. Nice cases but pretty pricey.

@alanhaynes4576 Год назад

If your not doing an a500 ++ is it an Amiga 2000 or 3000?

@CRG Год назад

Maybe...

@SuperVstech Год назад

I don’t understand why most RU-vidrs ignore the holes under plcc chips for pushing out the chips… does the Amiga have those holes?

@SuperVstech Год назад

I see when he flips over the board, no holes are present. Bummer.

@CRG Год назад

@@SuperVstech the rev5 Amiga 500 has the holes but this rev8 A500+ as you seen doesn't.

@SuperVstech Год назад

@@CRG yup, I guess commodore decided that chip would last forever… I’m surprised they didn’t just solder it to the board…

@wskinnyodden Год назад

Well, at least it was not an SBC problem (Shitty Bad Connection)

@jimmihenry Год назад

Maybe you killed the chip because of electrostatic load. You did not have the antistatic bracelet?

@CRG Год назад

I don't think so to be honest but I can't say for sure. Electrostatic is something I've never had an issue with before although yes that's hardly an excuse for not using the antistatic bracelet. I've asked Santa for one.

@jimmihenry Год назад

@@CRG Electrostatic damage must not be a total failure of the component. It could result in odd behaviour even over time. A walk across carpet possible 35000V and those parts are rare. Cheers.

@50shadesofbeige88 Год назад

Wow. You can't make this stuff up.

@CRG Год назад

It was a lot of work and some might say pointless since its getting stripped but it was good practice for other future projects.

@mal2ksc Год назад

@@CRG You like to have at least one known good spare of everything, right? Now you have a known good spare for the board itself.

@tiemanowo Год назад

I'm really surprised that you've decided to try to repair it. In this poor condition it will be "no, no" for me. If I had the board like this I'll be more likely to try migrate to brand new PCB.