Let's repair an old 286 mainboard Jaton JAM-2301-V1 

Tip for the future : Changing the power voltage can help read back flaky EPROMs, (some will need < 5V, some will need > 5V, depends on their internal circuits). It was not needed here, but if you ever have a bad one with content you can't find elsewhere this could come in handy.

When I wash boards I give them a quick shallow bath in isopropyl alcohol after washing with water. The alcohol is very good at removing the water and salts from under components and evaporates much quicker. Just remember to do this outside because the IPA fumes are strong and unpleasant.

This channel is a real blessing and I mean that. There are a couple of other vintage computer / Electrical engineering channels that are not misleading have people like yourself who are passionate and have in depth knowledge to share. every time I watch one of your repair videos I generally learn something new and cannot wait for an opportunity to try to build on my skill sets. There is a tech you tube channel of a bloke in Queensland Australia who makes other Australians look bad he gets used computer parts and cleans PCB's with automotive brake cleaner a very harsh solvent which I have seen when I worked in the automotive industry melt rubber this guy sprays it all over dirty motherboards and alike he is another one who follows the trend of another particular youtube channel who is generally corporate sponsored given a plethora of new tech goodies in fact he acts like he has more cents than brains so to speak. But now the guy in Queensland uses a ultrasonic cleaner but still uses brake cleaner and then shows people who to flip the parts and make stupid mass profits while some poor end user will have a dead pc one day due to the brake cleaner damaging components that stuff even causes rust too on certain metals. You really do show us how to get valuable vintage hardware take care to restore them properly I really am glad your channel come up as a suggestion one day I never look back. Now that prototype board of yours after Christmas is over I think I will be investing in a couple of those do you also have a CPI/PCIE version/s yet?

Another rescued board. And obviously a rare one, too. Even the early 486 boards doesn´t had integrated IDE and floppy. Your high quality content pays off now, it seems. Congrats to more than 15000 subs!

I learned something new today. Thanks!

That is incredible how well the damaged area comes back after cleaning and a polish with the dremel - all the traces crisp and visible again!

What a cool vintage board, a beast for it's time. You took such good care of the restoration. This was a joy to watch

I adopted your method of removing flux from a board by using alcohol with a toothbrush and then using the toothbrush with a paper towel to remove the residue (I use a clean cloth instead of paper towel and throw it in the wash when it gets too dirty). It is a very quick way to clean a board and looks like new afterwards!

The magical checking hole card is amazing

I agree, it's a "magical and satisfying moment" indeed. I have a board which I am struggling to repair which had battery damage, I will follow your advice on that. Great video as usual!!

love it takes me back to the beginning i still have a hoard in my basement

Just an extra tip : when you put the board upright after cleaning it with water, make sure the chips are aligned VERTICALLY - due to the surface tension of water, water won't flow between the legs of chips so it can get trapped there. If the chips are aligned vertically, the water can escape from underneath the chip itself without pins or legs blocking the "escape route". If you have chips running in both direction, it may not be a bad idea to change orientation after a while. I also find that a hairdryer can help coax water from trapped pockets.

Great video. Very informative. Thank you.

Following your instructions I've restored an EFA 4DMU-HL3S board inside of a Solitaire arcade cabinet that had a leaky battery. I had no idea how to do any of this before I watched your video. Thank you very much!

Yes! Another repair video. My favorites! They are so chill.

286 repairs are among of my favourites

Nice video! You were very lucky you could read that BIOS chip even though it was flaky. The freezing with the CF card is the BIOS software interrupt routine for reading the fixed disk. They likely copied IBM's original routine from the 5170 too closely which will freeze up on drives that are too fast. I go over the problem here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qO3xrl0XR-4.html It is fixable with disassembly and hex editing of that BIOS, but only if someone figured out the interrupt routine and is able to adjust the timing delay. Besides XTIDE, the other solution would be to use a newer 286 BIOS without the problem. You'd lose all those extra settings though, so it's certainly not ideal! Perhaps they copied the bytes directly from IBM so a little search and replace would work?

I love your repair videos. Retro computing is something i want to get into as i gew up with these old PCs in the 90s. Yes, i could emulate, but i'd rather have a retro PC :)

Wow, TH components! This is really on the cusp of technology! Making me want to have one...

Ahhh... I already have the rubber tips for my Dremel tool , but coating the traces with the flux is the key! I didn't know that, but watching the solder chase the fluxed traces was undeniable, and something I'd literally never seen before. This is all very important to me, as I own a pair of the very rare 25Mhz Harris chip 286 boards w/ 16Mb direct-addressable memory (not EMS) [and w/ soldered battery - ugh!], so I'll probably have to make similar repairs when I try to restore them. Many thanks!

Another great repair video :) 1) I need to be more methodical and patient when cleaning corrosion too. I love your result. 2) I usually use citric acid, this is the acid in lemon juice but in powder form. I make the solution as strong as I want. 3) This faulty ROM chips OMG, I will add this to my tests, thanks for the info!! 4) The two red caps are probably different as these are the only 16v ones (connected to +12v and -12v rails). I need to recheck some of my broken boards now :/

Thanks! Can't w8 for the upgrade :) been in computers for as long as I can remember but I started with a 486 sx/33!(later was my first major upgrade, with 9 chips of cache memory as well as going with the dx/33 CPU salvaged from a rummage sale.) I did have an XT but never took the time to learn programming as this seemed to be the only thing to do with these, until the flash card hard drives trick came about, which is exciting! now we can actually play some of those period games on ancient hardware! Cool BIOS trick on the network card too, looks like magic!

wow.. very nostalgic for me..I remember that Ive been working on those types and similar motherboards and doing those repairs almost 30 yrs ago.. well Im still doing electronics and computer repairs but this does brings back memories.. thanks..

Great job as usual! I discovered your channel a few days ago and can't get enough of it. Also thank you for helping preserve the retro hardware :)

You inspire me to start trying some old things to live again!!

Die Essigessenz hat mich kalt erwischt. Mega Nostalgietrip. Bin zwar 87er Baujahr, durfte aber trotzdem noch mit solchen Systemen rumbasteln.

Greeting from America's Gulf Coast! I've been watching for about four videos now, and am adding you to my subs list. This was a great troubleshooting path.

I'm new to the channel and dang this is amazing. I approve of using Commander Keen as a testing program. Grats on getting this working!

Thank you for showing this technique in such a detailed form. Your channel is excellent and is also very underrated. Thank you for your shared designs. I plan to produce some Dallas replacements for a couple of SGIs. Brilliant design 🙂

Awesome work👍

What a great video! I learn so much watching you tinker with these boards, so many tips and tricks. :) I've been binge-watching your channel for days now, absolutely love it. Please keep it up! :) I'd love to see you upgrade this board in the future as you hinted. Especially if it's possible to replace those horrible SIMM sockets, that'd be very educational to see. Best wishes from Sweden!

Your videos are awesome! Love what you do, love to fix things and you are an artist. Keep up the good work!

You are the reason i love retro hardware. Love your videos keep up the great work !

Good old days, good, old, days, 286 is what I can remember where I start from.

Thanks for the amazing videos. It's nice to see the quality improvement on your videos and new techniques over time. All your videos are very satisfying and teach us a lot. Keep up the good work.

Great video! Your channel is definitely one of my top discoveries of 2021. Keep up the good work.

Really enjoy your videos thanks a bunch for them!!!

You aré so good and entertaining! And you brought back hapyness to this nice jewel of a mainboard!! Great work! Kudos!! 👍👍

I love the style of this board, so many chips unlike today's basically smooth motherboards

Your videos are so informative! I always learn a few more tricks!

It's a work of love and also I took the way to repair, maybe helps to get mine working. Also it's interesting to see what can run with some add ons. I hope you build a pc of this too.

Nice repair once more!

Amazing restauration. I have a couple of 386 motherboards that need this kind of work. I'll reference your videos for sure. Great work, thanks for putting it out there.

My first PC was a 486 dx in October of 1992. 29 years ago. It’s mind blowing how the years past. It meant the world to me. A gift from my mom rip.

Love your channel. Brings back tons of memories.

That tinning of the traces is a good idea!

Hallelujah! Another board saved!

I'm currently troubleshooting a 286 board, and this video is a goldmine of information. Excellent explanations and presentation. Love your work!

Seeing this brings back so many memories...

I use the same method in washing the boards, except I use blue dawn dish soap. After rinsing with tap water, I give it a final rinse with distilled water and use compressed air for quicker drying. The distilled water helps get rid of impurities that tap water leaves behind for a spotless rinse.

Recently found your channel and have been binge watching these repair vids! My favourite type of retro videos to watch.

Never expected to see a bottle of surig here😂

15:25 YES, please make that short video about BIOS!

I love your videos - I cannot wait until next. Great job like always. You are awesome. This is better as movie.

Fantastic video. I own a very similar 286 board with onboard IO controller and up to 4MB RAM support. I bought it faulty due to battery damage and repaired it. One of my favorite pieces of hardware.

it's always cool to see old tech like this

What a great Video, Thank you sir!!

Thank you for the video sir. I was amaze and awe of your work. Love it

Enjoyed the Video, always pleasure to see you fix stuff :) Please put a 287 FPU to Upgrade it!

Very nice! Congratulations for this fascinating video!

Logic board repair is something I wish i learned. I have tons of respect for you guys !!!!!!

Наконец то 286 :) П.С. Я мою платы Mr.Muskul зелёным, смываю, потом розовым, смываю. Далее феном без нагрева выдуваю всю воду, в конце горячим потоком сушу. Ставлю в сухое тёплое место на 1 день. Выглядит как новая.

Always a good watch. look forward to the next one.

What a good video with information that few share.I haven't learned so much from a video in a long time Very good thanks.

Much fun! Was like going back when I learned the IT-Game. Very nice video. Happy it was suggested. Keep up the good work.

Beautiful repair good sir!

Yes, It would be a pleasure if you make a video about why some boards have two bios chips! Great content, as usual. Thumbs up for the repair video!

Very nice BlackMagic with network card!

Excellent video, many thanks!!

Sir, Your work is amazing

never saw such a great electronic technician. Respect, and greetings to you ! thanks for the video :-)

That's so cool how you repaired the traces with solder. It's almost like you painted them on!

You are such a nerd !!! good work .. Keep it up... Brought me back all the nostalgia !!!!

Wow ... What.... I salute You, MASTER!

Good video as always.

the infamous death barrel, the destroyer of all boards

Neat video! always like the trouble shoot process, keeps your brain sharp!

Great work 👌👏👏 Thank you for your sharing

Vote up, nice video clip, thank you for sharing it with us :)

Good repair!

Amazing work 👍 I remember our first PC was a 286AT with a 40 MB Hardisk, 1 MB RAM and a 16 colour EGA graphics card 😊

wonderful video, thank you

Another cool phrase - "a warping number!"

Really Great job!!

Great repair. You could move the sticker from broken BIOS onto new one using hairdryer. It's just a detail but it just completes such repair.

I always loved these 286, 386 boards, fascinating for that time period. i remember the vga card was 4mb.

The content of the video was interesting - good job!!!

Well done!

Good job

super satisfying video ❤

completely amazing

Step you missed. Lacquer or transparent nail varnish the exposed traces to prevent the solder traces from further corrosion via air.

1. Yes, we are interested in the video about two bioses. 2. Consider covering soldered traces with colored uv-hardened varnish for protection.

Nice restoration

Memories. Had same board with 286/16. 5 Meg ram. A 60 Meg hard drive. Sound blaster and svga card that I do not remember. My little power house tower 7th grade till my junior year of high school.

Amazing! Thank you guy!

I pull a lot of old hardware from e-waste and I can confirm that using soapy water is just fine on electronics. As long as you wash away all the soap you're good.

Ahhh. That's funny. Normal tap water has souls in it, according to the closed captions after 9:04. Tap water souls, making spooky lime stains. ...Mr. Clean gets tough on dirt and grime/ And grease in just a minute/ Mr. Clean will exorcise your house/ And every room that's in it. [insert the theme from the exorcist]

Very nicely done! washing computers with water is absolutely possible and I revived a laptop covered in coca cola back in time which worked for years now in a similar way as you did. depending on the amount of bad stuff I wanna remove I also wash in IPA with ultrasonic cleaner after washing with water. this also removes water previously applied to the board. it is great fun to watch your videos!

Great Video Like always, nice fix , i still wait for my TL866 II + but maybe next year come :-(