This Acorn A3000 keeps failing - Repair video
Рет қаралды 7,214
Күн бұрынOn the bench an ACORN 3000 from 1989, a great little machine in need of some TLC. The Acorn though had some hidden faults and kept me entertained for a while!
Take look at Alex's channel @bitsundbolts, it's amazing!
Acorn online forum: stardot.org.uk/
Swindon museum of computing: www.museumofcomputing.org.uk/
Open Source Scan Converter: junkerhq.net/xrgb/index.php?t...
Composite "add-on" for OSSC (not affiliated): www.aliexpress.com/item/10050...
USB HDMI capture device (not affiliated): www.amazon.co.uk/gp/product/B...
00:00 Intro
03:10 Power up and overview
04:13 Capture setup
05:36 Inside the A3000
09:34 Inspecting the damage
14:01 Fixing the traces
15:47 Socket installation
16:15 Battery solution
18:06 ROM cleaning and refitting
18:26 System overview
21:12 Testing the system
22:23 Floppy service
23:26 Fault #1 - HDD
26:23 Fixing the HDD
29:32 Fault #2 - CMOS
32:21 Fixing the CMOS
36:21 Final test
38:59 Outro
@thomasjosephlamarque2927 11 ай бұрын
Can’t believe I haven’t been to the Swindon museum. Even though I work there. I shall make a special effort next week to go. Thank you.
@tony359 11 ай бұрын
I might be there fixing things! If you ask for the curator, he knows me! ;) I am still getting to know the staff! I hope you enjoy the visit!
@gpamob 11 ай бұрын
Adore these early ARM machines, they seem so much ahead of its time, and at the same time, very retro nowadays! Thank you very much for yet another great video sir!
@tony359 11 ай бұрын
Thank you for watching!
@Snowsea-gs4wu 2 ай бұрын
I liked the video and I like watching Tony's videos! Thanks Tony!
@tony359 2 ай бұрын
Thank you!
@JeepinBoon 11 ай бұрын
Happy the museum said "YES". Great job diag and repair.
@tony359 11 ай бұрын
Thank you for watching!
@JeepinBoon 11 ай бұрын
@@tony359 I love watching videos like this while repairing electronics. One major pickup is "common" is NOT "ground". You can blow up a scope input or probe with that thinking.
@tony359 11 ай бұрын
@@JeepinBoon Absolutely, I learnt that the hard way! :) Did I make that mistake in this video? I am always happy to learn something new!
@JeepinBoon 11 ай бұрын
@@tony359 Not at all.
@rscelectrical7091 5 ай бұрын
Sadly i only just found your channel but this video was a pleasure to watch, i look forward to watching the rest of your content 👍👍
@tony359 5 ай бұрын
It's never too late! :) Welcome and thanks!
@rodhester2166 11 ай бұрын
Another great video of a computer that is not seen very often at all.. thanks
@tony359 10 ай бұрын
Thank you for watching!
@jayfowler4747 11 ай бұрын
Brings back memorys of my youth... i always wanted one of theses but could not afford one as a penny less student
@tony359 11 ай бұрын
Well, those were expensive machines back in the days! Computers were as expensive as cars! Thanks for watching!
@2009numan 11 ай бұрын
I loved how you blew the dust out of the floppy drive over the open PC so it went into the PC instead LOL
@tony359 11 ай бұрын
Yep, very clever of me! (ops!)
@lukedavis436 11 ай бұрын
now this museum is somewhere i Have to visit! it is a tech geeks dream!!!
@tony359 11 ай бұрын
It is :) Thanks for watching!
@hacktheplanet. 11 ай бұрын
Had one of these for a few years, end up being absolute money pits. Parts are stupendous now (providing it's not a small fix).
@tony359 11 ай бұрын
finger crossed! :) Thanks for watching!
@philipwalker2800 9 ай бұрын
Don't know if anyone else has said this but I had an Archimedes A310 with what I assume was a version 1 ARM inside. I'm pretty sure this came out before the A3000 series and the RISC PCs (Still using ARM). 1MB RAM and one floppy drive. For the time a brilliant machine. I think it is still in my loft somewhere. At the time it cost over £1000 but I thought it well worth while. It could emulate a PC in software if I had to. The 'Arthur' operating system was 'interesting' but worked well enough until RiscOS came out. This was about the time that Amstrad brought out their early machines . Actually bought one of those for work because we needed an actual PC to run some proprietry software. No comparison! Enjoying your videos and catching up slowly.
@tony359 9 ай бұрын
I have little knowledge of the Acorn machines but I have to admit they are amazing for the time they were released! The A310 was still fitting an ARM2 - I read that the ARM1 was never released. I did a bit of confusion in the video, I wanted to say the ARM2 was the first ARM CPU released, not that the A3000 was the first ARM machine released! Glad you're enjoying the videos - and thanks for watching!
@tomwaller6893 11 ай бұрын
Never ever seen a CMOS failure. Wow. Well done.
@mk500 8 ай бұрын
This is one of my favorite of your videos. Love that machine!
@tony359 8 ай бұрын
Thank you! It's an impressive one indeed!
@mogwaay 11 ай бұрын
Great video, very interesting repair and well done for getting it up and running again, esp the IDE HD spot, don't think I would've seen that!
@tony359 11 ай бұрын
I was lucky :) Thanks for watching!
@dazamad 11 ай бұрын
Great repair. I really like the new capture layout too.
@tony359 11 ай бұрын
Thank you for watching and for your feedback!
@arnlol 11 ай бұрын
Nice repair! I’m glad you went the extra mile and actually fixed the hard drive instead of being like "I’ll replace it with a CF card" like many people seem to do. PCB faults isn’t what people usually think about when a hard drive is failing, but here’s proof that it is not always the mechanical parts that goes wrong.
@tony359 11 ай бұрын
Thanks! I was also a bit lucky on that one :)
@samshort365 11 ай бұрын
30 plus years ago I read an article describing RISC OS 3 and I was blown away because it was way more advanced than Windows. In fact, I couldn't understand why we all weren't using it. Anyway, I eventually bought an R7500, which incidentally I'm actually using right now, although I'm posting this from phone. Anyway, I like your video as sooner or later I may need to do the same things you just did. So thank you for sharing. BTW, while FreeBSD is my main system these days, I still keep a RPi 400 dedicated to RISC OS 5.28.
@tony359 11 ай бұрын
I agree that RISC OS seems very ahead of its time! But we all know how things work: VHS, Windows 95 etc :) Thanks for watching!
@taffeylewis 11 ай бұрын
Great repair Tony. It's one of those machines I dreamed about owning when I was a kid. I may have to take a trip to Swindon so I can play with it :-)
@tony359 11 ай бұрын
I am so impressed by that machine! It's going on display tomorrow! :) It's so nice to know that it's having such a noble purpose! Thanks for watching!
@rogiervanlierop 11 ай бұрын
Keep these great videos coming, I love them!!
@tony359 11 ай бұрын
Thank you!
@mikemorrell7921 11 ай бұрын
Thanks for taking us along on this repair Tony.
@tony359 11 ай бұрын
Thank you for watching!
@charlesdesmond1 11 ай бұрын
Another great job! Thanks for preserving history
@tony359 11 ай бұрын
It's a pleasure! Thank you!
@MrProwler112 11 ай бұрын
Thank you for another great video ! Love the attention to detail. Keep up the good work !
@tony359 11 ай бұрын
Thank you for your kind words!
@tomhekker 11 ай бұрын
Just got this vid recommended all of a sudden! Great video, subbed to your channel!
@tony359 11 ай бұрын
Thank you and welcome!
@overnxted 11 ай бұрын
Excelent work, as always!!!
@tony359 11 ай бұрын
Thank you!
@ricardog2165 11 ай бұрын
Ooh that PET 2001 at 0:45 was my first introduction to computing!
@tony359 11 ай бұрын
I hope I can repair one of them one day!
@mrt.7146 11 ай бұрын
Amazing - love to see more on these ground breaking machines 🤩
@tony359 11 ай бұрын
Thank you - I hope I can come across another one (or similar) in the future! I know there is a 3010 at the museum which also goes on Supervisor :)
@Bergi2000 11 ай бұрын
Thank you for the great video! Many surprises… 😮 ❤
@tony359 11 ай бұрын
It'd be boring otherwise :) Thank you for watching as usual!
@jameshearne891 11 ай бұрын
The "inductors" are actually just 0 ohm links, the single Yellow stripe is commonly used on 0 R links. They may well have created options for inductors to be fitted in those locations, perhaps for the US or somewhere with tighter emissions regulations but they just fitted links on this board.
@tony359 11 ай бұрын
Good to know - I trusted the PCB which says "L" on them :) Thanks for watching!
@Jonne013 11 ай бұрын
Awesome work as always! I really liked seeing that demo floppy with the catchy beeps and bops.
@tony359 11 ай бұрын
ahah psychedelic indeed! :) Thanks for watching!
@timelordtardis 11 ай бұрын
One of my favourite computers. Well done. A great repair.
@tony359 11 ай бұрын
Indeed a beautiful machine! Thanks for watching!
@benjaminwirth5192 11 ай бұрын
Great video, Tony 👍
@tony359 11 ай бұрын
Thank you!
@Neodra 11 ай бұрын
Always so much fun when you close the computer and it won't boot. I'm glad you got it working again and I hope that many people will get to play with it.
@tony359 11 ай бұрын
ahah yes, it happens very often! I'm sure the A3000 is going to be under the spotlight for a little while! Thanks for watching!
@johnhammond3482 11 ай бұрын
thanks for the upload of this video most appreciated
@tony359 11 ай бұрын
Glad you enjoyed it! Thank you!
@marekkompis3725 11 ай бұрын
Awesome video! I enjoyed it a lot!👍
@tony359 11 ай бұрын
So happy you liked it! Thank you!
@tomwaller6893 11 ай бұрын
Wonderful Memories for me. Been there, done that. It loads the Roms in order, so it will try and give you a primary graphics-powered OS regardless of later errors. You left it as new. I just wanted to say that I'm so happy for you. Thank you.
@tony359 11 ай бұрын
It always makes me happy to fix things - this one is special as from tomorrow it's on display at the Museum and everybody will be able to sit down and use it! Thanks for watching!
@s1mph0ny 11 ай бұрын
Ah the duality of diagnostic repair: find the obvious broken traces and corrosion and also find the stuff that looks perfectly fine.
@tony359 11 ай бұрын
It's never boring :) Thanks for watching!
@miguel_gutierrez 11 ай бұрын
The video is very well recorded thanks
@tony359 11 ай бұрын
Thank you, I appreciate the feedback!
@bitsundbolts 11 ай бұрын
Great repair - what a stubborn machine :) It really tested your patience! Thanks for the shout-out!
@tony359 11 ай бұрын
shout-out well deserved! Thankfully it was not too stubborn! :) Thanks for your visit!
@MoreFunMakingIt 11 ай бұрын
Fantastic video Tony! Finally youtube shows me a channel that was made exactly for my taste. Amazing job catching and beating all those faults. Consider me a new avid viewer 😁
@tony359 11 ай бұрын
hey thank you and welcome!
@minombredepila1580 11 ай бұрын
Hi Tony. Have the very same computer, repaired for the very same problem. Thanks for the info on LK5 & D1 (1N4005 I guess), as I wasn't aware. Will fix mine following your guidance!!! It was described in the Service Manual (doh)...
@tony359 11 ай бұрын
So cool that those pads are there for us ready to use! :) Great to be able to help and thanks for watching!
@sokoloft3 11 ай бұрын
Nice! Another great repair.
@tony359 11 ай бұрын
Thanks 👍
@zebo-the-fat 11 ай бұрын
Nice, keep up the good work!
@tony359 11 ай бұрын
Thanks, will do!
@jorritbekema386 11 ай бұрын
great video as always. Hope you can repair some more computers from the museum in the future. 3, 2, 1, go Tony359!
@tony359 11 ай бұрын
Thank you! One is already in the pipeline, watch this space!
@fronskedeboer 11 ай бұрын
Hi Tony, wonderful and interesting video. When you fixed the HDD, I had warm feelings!
@tony359 11 ай бұрын
Always warm feelings when something is fixed :) Thanks for watching!
@Sydney268 11 ай бұрын
Hah nice work, reminds me of high school - had loads of these in the computer room, I think they were A3020's!
@tony359 11 ай бұрын
I know the feeling, I had PS/2 at high school and that's why I got one too (also repaired on this channel if you're curious!). Thanks for watching!
@tomwaller6893 11 ай бұрын
The middle mouse button was the key to much more and contact sensitive located menues. A wonderful system where the menu comes to you and not the other way around as Windows is to this day.
@tony359 11 ай бұрын
I'm very slowly learning about this OS!
@thealphageek1975 11 ай бұрын
Another amazing repair... and repair... and repair lol. Great work once again!
@tony359 11 ай бұрын
Thanks again!
@aleksandardjurovic4773 11 ай бұрын
Thank you! I enjoyed your video very much!
@tony359 11 ай бұрын
Thank you for watching!
@tomwaller6893 11 ай бұрын
Excellent stuff, and thank you. I was an Acorn dealer (Tower Electronic) in the late 80s and up to the mid-90s in Fyvie, a village in the NE of Scotland. I mainly sold the 1 to 4-slice Archimedes Acorn system for professional and serious hobby enthusiasts. Its Graphical User interface was way ahead of Windows at that time. They were all fitted with an Intel 486 co-processor and could run Windows 3 or (later) Windows 95 in a native Acorn RiscOS window. PS Not near the end, but the BIOS battery is toast?
@tony359 11 ай бұрын
indeed a wonderful machine with a powerful GUI! BIOS battery? The one which exploded? Thanks for watching!
@user-ml7bg6ki4y 11 ай бұрын
Thanks for the amazing video
@tony359 11 ай бұрын
Thank you for watching!
@MrKeebs 11 ай бұрын
Amazing video as usual Tony. Hope this helps to feed the algorithm! :-)
@tony359 11 ай бұрын
I hope so too! Thanks!
@genkidroid 11 ай бұрын
Great repair and great video ;)
@tony359 11 ай бұрын
Thank you!
@cocoe68 11 ай бұрын
Very interesting chain of repairs started by a killer battery!
@tony359 11 ай бұрын
Batteries are evil! :) Thanks for watching!
@DigitalDiabloUK 11 ай бұрын
I am always fond of the Archimedes range - it was the computer range in my secondary school education, and my first job was supporting and upgrading Acorn and PC systems. The RISC PC with 486 PDU was brilliant, and it pleases me that ARM continues to this day. Nb you can get a modern RISCOS to run on a raspberry pi.
@tony359 11 ай бұрын
I should try the RISCOS on the Pi, I'd like to know more about it! Thanks for watching!
@samuraidriver4x4 11 ай бұрын
Interesting machine and repair. Even if it only was replacing sockets there is still sort of a history lesson in the video.
@tony359 11 ай бұрын
Indeed - but "nice" that something else happened! 😉 Thanks for watching!
@skjerk 11 ай бұрын
Great video! I have an A3010 that I need to look at!
@tony359 11 ай бұрын
Make sure the battery has been removed! I hope you can fix it!
@teejmiller 11 ай бұрын
Well that was a fun adventure!
@tony359 11 ай бұрын
Yes, totally enjoyable! Thanks for watching!
@ayan.debnath 11 ай бұрын
Great Work!
@tony359 11 ай бұрын
Thank you! Cheers!
@samclacton 11 ай бұрын
Great video. Got yourself a new subscriber. Keep it up. 👍🏻
@tony359 11 ай бұрын
Hey Welcome and thank you!
@winstonsmith478 11 ай бұрын
Very interesting repair. And, wow, I didn't know I2C had been around that long. Looked that up and it's been around since 1982.
@tony359 11 ай бұрын
Oh wow! I had no idea either! Thanks for watching!
@AlessandroRossineonblack 11 ай бұрын
Well done!
@tony359 11 ай бұрын
Thank you!
@marcinmrugala3517 11 ай бұрын
Well done !!!
@tony359 11 ай бұрын
Thank you!
@NiTye357 11 ай бұрын
Another great video.
@tony359 11 ай бұрын
Thank you!
@mikeselectricstuff 11 ай бұрын
The A3000 wasn't the first ARM machine Acorn sold - that was the A305/310/410/440 series
@tony359 11 ай бұрын
You’re correct and not the first one to mention! I mixed up the first ARM CPU with the first ARM machine! Thanks for watching!
@Nimmo1492 11 ай бұрын
The computer of my school days, don't see too much about them these days
@tony359 11 ай бұрын
I didn't ask but I don't think they were sold outside of the UK (or not much) so they are pretty mysterious to me too!
@szogun112 11 ай бұрын
Great work
@tony359 11 ай бұрын
Thank you!
@Archimedes75009 11 ай бұрын
Great vid. The VIDC is also the sound chip btw.
@tony359 11 ай бұрын
ahhh, I didn't know that! Thank you!
@SanelKeys 11 ай бұрын
It was a proper repair video.👍
@tony359 11 ай бұрын
Thank you!
@andrewmeikle785 11 ай бұрын
Hi great video, that was my last acorn having owned all the bbc models , now im repairing ps5’s with 16 Gb ram 🤗🤗👍enjoy your videos keep up the good work
@tony359 11 ай бұрын
When you think at 4MB of RAM and compare it to 16GB... mindblowing! Thanks for watching! (also, repairing PS5 is not easy!!)
@bogdanbogunovic3995 11 ай бұрын
Of course we enjoyed it, as always. I wonder if it would be wise to cover the ROM's legs with a thin layer of some dielectric grease in order to prevent the corrosion from developing again.
@tony359 11 ай бұрын
interesting - wouldn't dielectric grease cause conductivity issues? After all it's very low voltage and very low currents. I really don't know, I'm wondering! Thanks for the feedback and for watching!
@darvil82 11 ай бұрын
Awesome video. I love videos where you go figure out what the problem is when it's not very clear. And this one is full of that! Don't get me wrong, I don't like seeing you suffer with computers that are so evil to continuously fail at you! lol
@tony359 11 ай бұрын
ahah no, but it's nice to be kept entertained by subsequent failures! Thankfully they happened one by one and not all together!
@josejeswin6936 11 ай бұрын
One of the most enjoyable repair videos ever.....i was biting my nails throughout the entire video......How about putting in a 40mm cooling fan?.......😊
@tony359 11 ай бұрын
thank you! Do you think a fan would be needed? I'm not familiar with that machine so I don't know how hot it gets.
@josejeswin6936 11 ай бұрын
@@tony359 i believe its possible to mount a fan....it might get quiet warm since the power supply,the processors and hdd are all crammed into the system case....i am no expert but you can also try some stick-on heatsinks over the main chips...maybe use an infrared thermal camera to identify any overheating components?
@tony359 11 ай бұрын
it would be an interesting project indeed! I'll check the temp of the case next time I'm close to it.
@sebastiendumais4246 11 ай бұрын
These Acorn machines were very well architected. Never owned one myself but I’ve seen a few videos featuring them and it’s a pity they didn’t become more popular…
@tony359 11 ай бұрын
Unfortunately the most popular thing is not necessarily the best :) Thanks for watching!
@whitemark84 11 ай бұрын
my biggest surprise was seeing a Seagate had drive in it didn't know they had been round so long
@tony359 11 ай бұрын
You can find Seagate HDD in VERY old boxes - I believe the one in the ProFile is a Seagate! It sounds like a F1 car! :) kzfaq.info/get/bejne/jM1krLGe1826nmQ.html Thanks for watching!
@wimwiddershins 11 ай бұрын
We had a few of these in the school lab, they were surprisingly powerful machines, at least as good as the highend Amigas.
@tony359 11 ай бұрын
I can only agree! Thanks for watching!
@SobieRobie 11 ай бұрын
Great outfit Doctor!
@tony359 11 ай бұрын
LOL! Thanks!
@askoldmodera 11 ай бұрын
wew, that's an interesting machine! Never heard much about it.
@tony359 11 ай бұрын
Neither did I until 3 weeks ago :) I could barely turn it on! :D Thanks for watching!
@Ironclad17 11 ай бұрын
Lucky you noticed the hdd. It's easy to forget even the simplest components can still have ICs fail.
@tony359 11 ай бұрын
I was happy to see such a simple fault :)
@jamesleetrigg 11 ай бұрын
I had one of these at boarding school. I got it with the money I inherited, and when I went to the bank to get the money out, I said have you ever seen so much money to the person in the bank. Lol I wish I had a time machine to go and slap my younger self. Of course they would have 😂
@tony359 11 ай бұрын
ahah for a moment I thought you went to the bank to collect the Acorn :)
@tomekrv942 11 ай бұрын
Very good video. Before You opened this FDD I was thinking that there will be rubber belt like in laptop Citizen drives which is always a piece od gunk.
@tony359 11 ай бұрын
Oh it never happened to me, I've only saw videos where the belt turns into goo and I hope it will never happen to me! :) Thanks for watching!
@TomStorey96 11 ай бұрын
Man that thing just wouldn't let you win. 😂 It would have been interesting to see the original RTC/CMOS chip tested in the socket just to see if it was really really dead. 🙂
@tony359 11 ай бұрын
Good point! I didn't think about that! Thank for watching!
@Epictronics1 11 ай бұрын
Things seem to keep braking until we have a good video lol
@tony359 11 ай бұрын
Maybe, it's just that sometimes things keep braking regardless! :) Thanks for watching!
@odette9710 11 ай бұрын
Thank you for the nostalgic video. I had several Acorn machines (from the early Atom up to a two slice Risc PC), The ROM set contains far more than the OS (it doesn't boot from de hard drive just from the ROM) so maybe the rom nr3 contains a part that is only needed for Apps or expansion Podules? I stil have som ROM sets here even with the first Risc OS 0.3
@tony359 11 ай бұрын
Thank you for watching! On the forums they told me the ROM cover the 32bit bus - each ROM is 8 bits. So it's not possible to run the system without one of the ICs as the data back wouldn't be complete. Weird, isn't it? :)
@dr_jaymz 11 ай бұрын
Oscillator looks perfectly normal. It will be a sinewave of a few hundred mv around 2 to 3v of dc offset. You won't be seeing a 3.3v square wave if that is what you were looking for.
@tony359 11 ай бұрын
oh no, it was the amplitude which was concerning me. But as you say, it's fine. Also I believe that just probing a crystal will change its shape? Thanks for watching!
@TheDigitalOrphanage 11 ай бұрын
Great work and an entertaining video. Nice to see what was happening on the other side of all the WhatsApp messages! Looking forward to the museum visitors using it tomorrow!
@tony359 11 ай бұрын
Really happy to see it on display today! Thanks for watching!
@KikuVasNormandy 11 ай бұрын
I´m still wondering how that goo reached the hard drive IC, that was weird! Great job!
@tony359 11 ай бұрын
Very weird indeed! Thank you!
@tomwaller6893 11 ай бұрын
You have impressions. What a great word processor and publishing programme that was. Way ahead of MS Word and Office.
@tony359 11 ай бұрын
I shall test it next time I'm in front of the A3000!
@edmil1616 8 күн бұрын
Mas como deu trabalho este computador, hein! Que ótimo que deu tudo certo no final. Comecei comentar os seus videos conforme pediu, para dar mais visibilidade ao canal. Você trabalha muito bem, parabéns! Abraços do Brasil.
@tony359 7 күн бұрын
Thanks for helping giving visibility to the channel! And happy that you enjoyed the video. As far as I know the Acorn is still working at the museum :)
@yogibear2k220 11 ай бұрын
This is the computer I wanted to get instead of the Amiga. This machine blows the Amiga away in every detail (especially the sound,) but it was way to expensive at the time.
@tony359 11 ай бұрын
As I said I am not familiar with the Acorn family but it gave me a feeling of a good quality, professional machine! Thanks for watching!
@alexpinkerton7459 7 ай бұрын
my old computer, and the one I learned to program in ANSI C on
@tony359 7 ай бұрын
it's a very nice machine indeed!
@ULumia 4 ай бұрын
ARM1 only used in ARM Evaluation Board for BBC Micro
@tonystanley5337 11 ай бұрын
If you want to get really preventative, you should bake a old board before soldering (24hr at 100C or so). Maybe not such an issue for PTH soldering but chips and SMD reflow can blister if they have absorbed moisture.
@tony359 11 ай бұрын
Oh I know! :) kzfaq.info/get/bejne/pdOGZK171s-7cZc.html (Old video, sorry for the bad quality!) Baking is key for SMD. I now have a "dry box" were humidity is around 10/15%. I store a board I want to work on in the box for about a week, then I bake it. And it can still popcorn. I envy those who just blast 500C to a random board and claim they never had issues! :) Thanks for watching!
@mrab4222 11 ай бұрын
You said that it was the first ARM computer released to the public. It wasn't. The first were the Acorn Archimedes A305 and A310.
@tony359 11 ай бұрын
You're absolutely right, my bad! I think in my mind I had the "first ARM processor" but I mixed up! Thanks for watching!
@simontay4851 11 ай бұрын
Well done with the final repair of the CMOS IC. I wouldn't have known to replace that. Is it an EEPROM IC? It probably can only be written to a limited number of times.
@tony359 11 ай бұрын
Good point - I am not very familiar with the difference but would an EEPROM require voltage to keep the data? This will wipe the data if there is no voltage. The datasheet says 240 × 8-bit low-voltage RAM. Thanks for watching!
@damianbutterworth2434 3 ай бұрын
I used a old phone battery on my A3000. I thought they never got charged off the motherboard. I must of heard a video wrong. I was lucky to not get so much acid on the board. I had to replace the RTC chip to get it to boot it properly. It had been stored in a freezing attic for about 10 years. And the original monitor works ok.
@tony359 3 ай бұрын
it's been a while but I think I had 5V at the battery connector? I cannot remember if I checked or just trusted the schematics! :) Great to hear the monitor also works!
@damianbutterworth2434 2 ай бұрын
@@tony359 I`ve put a proper RTC battery with a diode in mine now. Yes there is 5 volts at the battery. I got a RGB to Scart cable to use the old TV but it`s just a white blank screen. Works ok on mono cable. I wonder if I need to put voltage into scart pins to get the TV to turn on RGB.
@tony359 2 ай бұрын
@@damianbutterworth2434 If I remember right the Acorn is a... analog SCART? Or digital? One that doesn't work with the more common scart. Like the Amiga maybe? I might be mistaken though. Did you check on the stardot forums?
@damianbutterworth2434 2 ай бұрын
@@tony359 I`ll keep trying mate. Thanks for the reply. I`ll search stardot now.
@Dutch-linux 11 ай бұрын
nice video
@tony359 11 ай бұрын
Thanks!
@laurencejohnson4106 11 ай бұрын
Well fettled!👍👍
@tony359 11 ай бұрын
Thank you!
@SanguineBrah 11 ай бұрын
What a strange hard drive fault. I'm genuinely curious how that could have happened. It's so hidden out of the way there. I wonder if something was splashed on it during manufacture? A bit of flux perhaps?
@tony359 11 ай бұрын
It's still close to the ventilation and that IC is facing up (but covered by the HDD) so maybe something spilled and corroded overtime? Weird indeed. Thanks for watching!
@arnolduk123 11 ай бұрын
At 17:55 looks like the symbol for D1 is a schottky diode. The voltage drop from a standard diode would reduce the battery voltage down to 2.5V so won't last as long.
@tony359 11 ай бұрын
Thank you, I didn't consider that. What is the difference in voltage drop between a regular diode and a schottky? The CMOS takes down to 1V so hopefully it won't make a huge difference. If I see the battery dying soon, I'll replace the diode - thanks for your input, much appreciated!
@arnolduk123 11 ай бұрын
@@tony359 Schottky < 0.2V but regular diode would be 0.7V or more so more leakage current but only a few micro amps. Not a huge difference but considering a CR2032 3V cell is pretty much done below 1.5V. All depends on how much current is drawn from the RTC and CMOS circuit.
@tony359 11 ай бұрын
at 1V it's 2uA.
@Pickle136 11 ай бұрын
nice repair, do you think it would be worth putting through a ultra sonic to get the small bits of remaining green crud?
@tony359 11 ай бұрын
Probably - I’ve been looking fo a big one for ages but I also have mixed feelings about that. I know some components don’t like that. But for such a damaged board it would have probably helped. Thanks for watching!
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