XT motherboard hacked & hard drive repair. IBM 5155 & Miniscribe 3212 & reassembly after restoration

Рет қаралды 7,257

Күн бұрын

IBM 5155 teardown here: • IBM 5155 teardown + po...
IBM 5160 Restoration here: • IBM XT 5160 Multiple f...
--------------------------------------------------------------------------------------
New on patreon.com/Epictronics
--------------------------------------------------------------------------------------
Tools I regularly use
DeoxIT D5 Contact Cleaner
Hanstar 861DW Rework Station
Pro'sKit SS-331 Desoldering Station
UNI-T UT61E Auto Ranging Multimeter
UNI-T UT890D Manual Ranging Multimeter
MESR-100 mk2 ESR meeter
PINECIL Soldering Iron
PinePowerPSU
TS-100 Soldering Iron
AMTECH NC-559-ASM Flux
MaAnt Grinding Pen
Multicore 60/40. 0.38mm and 0.5mm solder
TL866 II Plus Programmer
Tektronix 2246A 100 MHz four-channel analog scope
PCBs from PCBWay.com :)
--------------------------------------------------------------------------------------
patreon.com/Epictronics
Join me on Twitter: / epictronics1
Music by Karl Casey @ White Bat Audio

Пікірлер: 105

@Epictronics1 Жыл бұрын

IBM 5155 teardown here: kzfaq.info/get/bejne/icupfKWf1smnkZ8.html IBM 5160 Restoration here: kzfaq.info/get/bejne/jpdlm694196oYKc.html Support me on patreon.com/Epictronics

@amurtigress_mobile365 Жыл бұрын

@ 14:04 is it just me or was the LOWER R/W head stuck...It looked to me like something was bent when you moved the platters, and eventually it went PLING! when the head came off. Let's hope the platter's magnetic coating was not damaged... *continues watching*

@Epictronics1 Жыл бұрын

@@amurtigress_mobile365 I rewatched that part and I think you're right. I have used the machine for a bit now and played some DOS games. It seems to have survived the trauma

@TheChipmunk2008 Жыл бұрын

When doing telephone cord restorations, i found boiling water with no rod at all, made them relax to their original shape

@petevenuti7355 11 ай бұрын

I got two of these, if I don't sell them , this will me most useful for restoration.

@TheRetroRecall Жыл бұрын

Happy caps again!! Everytime I see a happy face on the caps I smile! Haha. Great work!

@Epictronics1 Жыл бұрын

Happy caps= happy IBM :) Thanks

@heilong108 Жыл бұрын

For future reference you should never move the heads on a hard drive while it's not spinning. Sometimes you get away with it, but it can cause platter damage. You may also have been able to get to the spindle flywheel to free it up without opening the cover just by removing the logic board

@Epictronics1 Жыл бұрын

Yes, of course, Nobody should ever open up a hard drive at all. In this case, the lower head was stuck to the platter and the motor had seized. The choice we had was to either do what we never should do or throw away the drive.

@jameshearne891 Жыл бұрын

At kzfaq.info/get/bejne/fMVxecqWqr3Jp3k.html you can see the lower heads bending as the motor is turned, i'm amazed the heads survived.

@jameshearne891 Жыл бұрын

@@Epictronics1 He is right though, on those (and almost all MFM drives) , the motor is exposed on the bottom of the drive under the logic board and you can just turn it there.

@Epictronics1 Жыл бұрын

@@jameshearne891 Yes, I rewatched and noticed, lol. I'm still using the drive and it works like a charm

@RichMye-wx1ob 2 ай бұрын

@@Epictronics1ive just bought a 5155 and basically doing the same, there was a ST-225 inside not working. Taking it apart the straps from the head to the motor had completely snaps. I guess the heads must of been banging a long time to cause this. I've put a ST-251 in it and its working now fine, also installed laplink portable for serial connection to my dosbox. There is also a memory Io card in it "microforce plb-85". Cant find any info on it.... Other than that it's fine, only the psu fan is screaming. has anyone experience in lubricating this particular fan, maybe could give me some tips. Thanks

@awilliams1701 Жыл бұрын

Repair of the video card sounds like fun.

@Epictronics1 Жыл бұрын

I'll give it a go. The only thing I can do is to check if the logic is working. The rest is custom chips and a ROM with unknown content. But it's worth a try

@awilliams1701 Жыл бұрын

@@Epictronics1 yeah

@stephen.mcguire Жыл бұрын

Wow great stuff, can't believe you are able to get those things back together...working on getting some 486 parts to build a dos machine with my son. Thanks for sharing!

@Epictronics1 Жыл бұрын

Thank you

@RichMye-wx1ob 2 ай бұрын

Admire you again removing ic's from that board. I had to resolder one last year on my 5150 with a socket, my hand was shaking with fear of damaging the tracks 😊.The other Hercules 2 colour hi Res graphic card rings a bell, I had one working with windows 3.1 back in the day. I also did the same trick you did with the keyboard cable on an old Rotary dial phone.

@Epictronics1 2 ай бұрын

Thanks. That Hercules card is actually on the bench right now. Maybe, we'll fix it this week

@f.k.b.16 Жыл бұрын

At my first job, we had a $60,000 SGI Indigo. We used it for about 2 months when one day it through a hard drive failure error. SGI's tech support recommended removing the hard drive and drop it in an office chair... "That'll fix it!". They were serious and we did it and it actually fixed it. Apparently the heads would get stuck.. A known issue. For $60k.... You'd expect better lol!

@Epictronics1 Жыл бұрын

lol

@AlejandroRodolfoMendez Жыл бұрын

This reminds me of a hp printer the official hp forum posted the solution as unplug the printer and then up a bit and let it fall. For when get stuck. And worked.

@gremfive4246 Жыл бұрын

I have to say I havent seen a lot of 5155s but that is the 1st one I have seen with a hdd, all the rest I have seen have the dual fdds. Another great video.

@Epictronics1 Жыл бұрын

Thank you

@tomleech9753 Жыл бұрын

I'm so glad you showed the heat gun trick. Surprisingly few people know about it. Now have you tried twisting the cable so the twist goes in the opposite direction? I find that tightens up cables really well too after you've tighened up the coil.

@Epictronics1 Жыл бұрын

I wasn't aware of the "reversing the coil" hack before I got comments on this vid. I'll try it out in part 3. Thanks

@chaoticsystem2211 Жыл бұрын

CGA doesn't even look so bad on an amber screen :D

@50shadesofbeige88 Жыл бұрын

Nice work on the hard drive! You're braver than me. 😂

@Epictronics1 Жыл бұрын

Thanks : )

@Wormetti Жыл бұрын

Great video. I was wondering the whole time what was wrong with the Hercules CGA card, curious to find out.

@Epictronics1 Жыл бұрын

Thanks. yeah, I think I'll have a go at repairing it. It's a weird and interesting card to keep and use in this machine

@saifal-badri Ай бұрын

This is my favorite IBM machine, I enjoyed this restore. I did mine a while ago, try to find an ATI small wonder graphic solution it has the pin header and could do EGA on this CRT very fun upgrade

@Epictronics1 Ай бұрын

Thanks. I have since this video replaced the two VRAM chips on the original card and it now works too :)

@ovalteen4404 Жыл бұрын

Are you going to make a repair attempt on that Hercules card?

@Epictronics1 Жыл бұрын

Yes

@sandmanxo Жыл бұрын

While I've taken apart many hard drives, it was never to help them live on. Glad to see it was successful, at least in the short term.

@Epictronics1 Жыл бұрын

Well, I'm making a backup of it now and installing a fresh copy of DOS. I'll let you know if it keeps working

@richshealer3755 Жыл бұрын

I would recommend running Spinrite on the hard drive.

@Epictronics1 Жыл бұрын

I think I will. I have it on the bench now to do a clean install of DOS

@UpLateGeek Жыл бұрын

That's a good tip about pre-heating the board before desoldering the caps. I've got a socket 370 board with bulging/leaking caps, and I destroyed a couple of traces while attempting to desolder the second cap, so put the project aside at that point. I'll give the pre-heating trick a try with the rest of the caps, hopefully that will prevent more damaged traces.

@Epictronics1 Жыл бұрын

Be careful not to heat the board too much. If you heat the board long enough, some components will actually start falling out. Start with 30 seconds at half speed/heat. I will be recapping a Dual Socket 370 board on the channel, but that video is still weeks in the future, Good luck with the project

@UpLateGeek Жыл бұрын

@@Epictronics1 Thanks for the tip!

@LuisGuzmanJr Жыл бұрын

Great work on the restoration. Quite a nice retro PC.

@Epictronics1 Жыл бұрын

Thank you

@LotoTheHero Жыл бұрын

That's really cool that you were able to get the hard drive working again. Hopefully you'll be able to get some use out of it for some time. It would definitely be cool if you are able to repair that original graphics card.

@Epictronics1 Жыл бұрын

Thanks, I'll give it a try

@RudysRetroIntel Жыл бұрын

Restored to museum quality!! Excellent work and video. Thanks for sharing

@Epictronics1 Жыл бұрын

Thank you

@thedungeondelver Жыл бұрын

Man, I had figured the display was down to a dirty pot on the monitor controls or a voltage issue. Nicely done. Can't wait to see this guy overclocked and expanded! You thinking '286 card in there or something?

@Epictronics1 Жыл бұрын

Dude, that would be so awesome. Unfortunately, I don't have an Orchid Tiny Turbo or similar. Hopefully, someone will reverse-engineer it. I'd be the first to order PCBs and build one up

@BigBadBench Жыл бұрын

Really nice machine! Always stressful to try manually spinning the platters, but it paid off!

@TheChipmunk2008 Жыл бұрын

yeah that pinging noise made me grit my teeth

@Epictronics1 Жыл бұрын

yeah, I was lucky! Playing Tetris now, like it's 1984 : )

@Epictronics1 Жыл бұрын

@@TheChipmunk2008 Me too actually, I was just playing cool on camera ;)

@jdmcs Жыл бұрын

I'm surprised IBM didn't omit the socket for the 74LS158 to save a few additional cents per unit... nice upgrade!

@Epictronics1 Жыл бұрын

yeah, not sure what IBM were thinking. I guess they were prepared to quickly change to offer these with 640k, thanks

@julianbarron5293 Жыл бұрын

Another awesome video!

@Epictronics1 Жыл бұрын

Thank you

@rallyscoot Жыл бұрын

Good tip when you open stepper motor drives.. Check for dust before you close the lit again.. If there is little dust, use compressed air can to remove, so the whole surface is clean again before closing the lit for good. Never use a hammer on stuck HDD.. Mostly they are stuck for a reason. Head can also stuck on the platter or close to it. Then you make more damage when using the hamer method.

@Epictronics1 Жыл бұрын

Good advice

@awilliams1701 Жыл бұрын

I thought these came out on saturdays. Nice getting it day early

@Epictronics1 Жыл бұрын

Yes, trying something new. Thanks

@Capt.Marco-Hawk-L.L.A.P Жыл бұрын

Awesome job

@Epictronics1 Жыл бұрын

Thank you

@craigrenwick9132 Жыл бұрын

Thanks for a great video

@Epictronics1 Жыл бұрын

Thank you for the encouragement

@jozsefizsak Жыл бұрын

Very nice!

@Epictronics1 Жыл бұрын

Thank you

@MonochromeWench Жыл бұрын

Never do it, but sometimes it is helpful to get that last bit of life out of a drive. I wouldn't trust the drive to last much longer. That stuck head seems like bad news waiting to happen.

@Epictronics1 Жыл бұрын

I'll do some tests later. Right now I'm too busy playing Tetris on this IBM : )

@danielflakelar8193 Жыл бұрын

Nice work. I normally dont use a jumper for E2 but use a small cutoff leg from something (Tant cap usually) as it is very un likely anyone is going back to 256K ram. Nice work though you have a very nice portable now

@Epictronics1 Жыл бұрын

Yeah, I don't expect anyone will ever go back to 256k but I thought a jumper looked neat and original. Thanks

@pc4ad Жыл бұрын

Just wondering if you would be able to up the ram to 768 or 832 kB and use upper memory blocks.... That was possible with the P3105 (Philips Machine)

@Epictronics1 Жыл бұрын

Yes, I think this board is hackable to more than 640k

@8088argentina Жыл бұрын

need the pc sprint

@R2AUK Жыл бұрын

🔥👍

@TonyLambregts Жыл бұрын

21:30 ithe next step should be to reverse the coil. f you reverse the coil it will get tighter. This is done in the manufacturing process.

@Epictronics1 Жыл бұрын

I'm not sure I understand. What do you mean by reversing it?

@TonyLambregts Жыл бұрын

@@Epictronics1 kzfaq.infobn5wcgRu9-0?feature=share shows the technique in the second half of the short.

@Epictronics1 Жыл бұрын

@@TonyLambregts oh, that makes perfect sense. I'll try that, thanks!

@victors3803 21 күн бұрын

If you bought it from russia, there is a great chance that it was my computer! It didnt have the same circle pads on a back of a keyboard. If it has 640 kb of memory, which was very rare, and 20 Mb HDD then it was definetevly mine. My favourite games there were “kings bounty”, “ranger”and “Chessmaster 3000”. I think i had nearly 20-30 different games there. “Golden axe” was loading for 40(!!!) minutes and was going extremely slow. I sold this computer in 1995. In 2005 i wanted to buy it back but the guy sold it to someone else((

@Epictronics1 21 күн бұрын

Probably not :) This one only came with Tetris

@shaylanmackay3930 Жыл бұрын

at 14:30 when you Opened the Hard Drive you didn't clean the stepper motor full of dust inside.

@Epictronics1 Жыл бұрын

Yeah, I noticed that dust too late. But the dust was sticky, I was lucky

@ricardog2165 Жыл бұрын

That would probably increase the chance of dust landing on the platters.

@GigAHerZ64 Жыл бұрын

23:00 what's wrong with the music during assembly?

@Epictronics1 Жыл бұрын

That's what you get on a budget

@nickwallette6201 Жыл бұрын

You get one second more of the loop for every Patron that signs up. haha

@Epictronics1 Жыл бұрын

@@nickwallette6201 Haha, not too far from the truth! Patreon money is eventually going to buy assembly music for the channel

@Zaffindo 11 ай бұрын

What caps are used here?

@Epictronics1 11 ай бұрын

The tantalum caps on the MOBO are 10uF 16v, cheers

@Zaffindo 11 ай бұрын

And those other one's? I got one broken. It says like 47nM. In the schematics it is 47 pF. Are those important for a working board?

@Epictronics1 11 ай бұрын

@@Zaffindo I don't have a board accessible right now to check. It's very likely that all the small caps have the same value. It's also very like to work without that cap until you have found a replacement

@MrEnyecz Жыл бұрын

Nice. It is quite brave that you just use that hdd you opened previously... that thing will fail in no time. Actually some sudden moves counterclockwise should make the same result without opening... but that is well known that not a permanent fix. This will not be one either, that hdd will fail. Save your data! :)

@Epictronics1 Жыл бұрын

I better save that copy of Tetris right away ;)

@tomleech9753 Жыл бұрын

yep. Giving it a firm rotation and a sudden stop is usually enough momentum to get it to overcome the sticktion.

@95Comics 3 ай бұрын

Why did you have to blur the screen? I don’t think people will care if you show their name 40 years later if they’re even still alive they’d probably be pretty happy to see that they’re hard drive is still alive.😂. I don’t think there’s gonna be any life or death confidential information on this drive lol.

@Epictronics1 3 ай бұрын

You're probably right