Car Boot Retro PC Finds 14th April Sometimes They Go BANG!!

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I went to the car boot sale again, what did I find this week? Wanna find out you just gotta press PLAY
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Опубликовано:

3 окт 2024

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Комментарии : 46

@Lightrunner. 5 месяцев назад

I love the older motherboards. It is history and explain the technical steps . Thx Richard.

@EdDueck-qv3wx 5 месяцев назад

I am working on the power supply 0-30v you started a year ago. I am disappointed that you didn't complete the project. I found the transformer for the project from a used UPS that was discarded. Anyone in need of a transformer, they are easy to find from salvaged UPS that have been discarded.

@1pcfred 5 месяцев назад

An explosive episode.

@Dutch_off_grid_homesteading 5 месяцев назад

Heya, didn't know amd made 486 processors wel it's a nice retro pc except for the front panel. and the 2st one with a nice short on the hdd love to see this all

@SkruvaMedMartin 5 месяцев назад

I had one of those S3 cards in my 486DX2 back in the days…

@anthonydenn4345 5 месяцев назад

Maybe because you're in an isolated location, like a small island, the older stuff sticks around longer. With the current recycle generation, they probably won't be as abundant in the next couple of years. So snap them up 🙂

@CTCTraining1 5 месяцев назад

Interesting video ... might be an idea to scope the supply to see if the psu is allowing through spikes sufficient to annoy the disk drive. Keep up the great work 😀👍

@LearnElectronicsRepair 5 месяцев назад

In it's defense I use that known good 20 pin ATX PSU on all my videos for ATX boards that don't have the 24 pin ATX connector. It did go wrong at one point while making a video and I had to recap it (this is on another of my videos somewhere) so I am quite confident in it being OK. I don't know what caused the TVS diode to explode, normally it is spikes like you say. Interestingly the HDD then worked once I removed the protection diode. It is possible the TVS had already failed and when I used my ATX PSU rather than the one in the original case, it had enough wumph to explode the diode?

@Foobar_The_Fat_Penguin 5 месяцев назад

I've had a number of SATA drives that failed due to the TVS diode suddenly going bye-bye. Different manufacturers, different mainboards, different PSUs. One case was particularly annoying because the fault was intermittent. The diode was cracked and depending on the temperature and drive vibrations, the layers inside would sometimes shift to create a short circuit, causing the drive to die abruptly. Other times, the diode would be open circuit and the drive would just work normally. When I throw out old drives (nobody uses ≤250GB SATA drives anymore), I usually salvage the magnets (always nice to have) and the controller PCBs - just so I have some replacement TVS diodes. For those who have no salvage drives: Something like a SMBJ12A should be a suitable replacement.

@LearnElectronicsRepair 5 месяцев назад

Thanks for the info 🙂

@mesterak 5 месяцев назад

That’s the first time I’ve heard a hard drive “pop” like that. That is good to know to just check for shorts and remove the faulty TVS diode. Thank you for sharing as always!

@chrissv2 5 месяцев назад

The first board is a PCChips M918 and the GPU is a SiS 305 with 32MB SD-Ram.

@LearnElectronicsRepair 5 месяцев назад

Thanks Chris

@Dutch-linux 5 месяцев назад

@2:55 ooh look it comes from Ali 🤣😂

@chrishartley1210 5 месяцев назад

Early Ali-express😊

@LearnElectronicsRepair 5 месяцев назад

Hehehe

@Dutch-linux 5 месяцев назад

@@chrishartley1210 🤣🤣

@davidgranger3628 5 месяцев назад

When i worked in the electronics workshop at the local uni a student brough his pc in for us to autopsy for a warranty claim (how its so easy today) he said something had gone pop inside so he switched it off.We fired it up and it seemed fine but there was a faint smell of pixel dust .It ran for an hour or so and made a distinct pop .We switched it off and had a nose around but found no sign of the cause. We started it up it ran for a few minutes then there was a huge bang and we dashed to it to see half the graphics card has gone .Somethings not right us sages said and on taking it apart found a wire in the psu had been intermittently shorting to mains no doubt upsetting upsetting things downstream .He got his report we found bits of his machine around the workshop for months.I have had computers since 1979 and my first pc was an ibm at thing but i have never seen or heard a computer destroy itself so well in all that time ,even a student accidentally dropping a screw into one couldn't reproduce that bang and those students could destroy anything!

@andygardiner6526 5 месяцев назад

We had a Harris mini that was run off a smoothed 3-phase supply and about 10 physically big 12/5/24v power supplies with massive smoothing caps (about 75000uF/50V screw terminal jobs IIRC). Being a vultures, when it was ripped out I had the supplies. Unfortunately nearly all of them blew the caps at startup (even using a variac as a soft starter) which caused some excitement in the workshop :-) If you had a few in parallel charged to 50V and discharged them through a bit of magnesium voice coil off a hard disk pack actuator it was somewhat spectacular ...

@originalmianos 5 месяцев назад

I wrote a custom display driver under dos for that s3 trio chip. It had a 'blitter' and was insanely fast at 2d graphics at the time.

@Nebbia_affaraccimiei 5 месяцев назад

35:00 if you're here for the bang!

@cfq.tufanuf7601 5 месяцев назад

Love these videos ❤❤❤

@gnuorder 5 месяцев назад

Looks like you got a cap backwards around 27:50.

@gnuorder 5 месяцев назад

Actually they all look backwards to the right of the CPU. The one on the left side looks correct.

@Taliesen. 5 месяцев назад

Electricity costs may be a factor in why you are finding so many old machines. I read your costs have gone WAY up in the last year. People finally ditching them because they cost too much to run? Likely pay off a modern MiniPC within a year on the electric bill savings alone.

@twithheldmwithheld8938 5 месяцев назад

I posted a comment, refreshed the page, and now it's gone....?

@melvilib 5 месяцев назад

Does the PSU blow air over the CPU heatsink? or one of the case fans if fitted.

@Pickle136 5 месяцев назад

are you only ever selling these to locals?

@mikepanchaud1 5 месяцев назад

Did you open the dongle ?

@LearnElectronicsRepair 5 месяцев назад

We are going to do it on the next livestream @theelectronicschannel 28th April 5pm UK time. We also have a Gochifix LG303 Scopemeter to give away in a free draw on the same livestream

@garypoplin4599 5 месяцев назад

0:53 - it looks like a 386 or 486. I think the Pentiums had the ps/2 keyboard and mouse. 9:09 - It has a 3.5” miccofloppy in it. You could use a DOS 5.0 or 6.22 boot disk. 15:22 - This one looks like it has an onboard Ethernet network controller. 15:31 - Can’t see it well from this angle; but, it may be an LPT hardware key or just a gender bender.

@LearnElectronicsRepair 5 месяцев назад

Some nice guesses. I have quite a few pentium 1 here which have AT motherboards. Well when i say Pentium 1 I mean the socket 7 type. I honestly don't know what the big pentium 60, 66 and 75 CPU that came before that are called. Pentium zero? I've never found one of those machines yet while looking for retro PC but I did own one back in the day. I'm pretty sure that was also an AT machine. As a real rarity I also once found a Pentium 3 PGA370 machine which had an AT form factor motherboard! It's on one of my old car boot videos around January-February 2023. I found it on Dec 26th 2022. Some here called that thing a real unicorn..

@garypoplin4599 4 месяца назад

@@LearnElectronicsRepair Instead of calling it a 586, they went with the pentium name (then Pentium II, III, etc.) My first computer was the TI 99/4a with cassette tape to store programs. Then, when I moved up to the XT with 640k of RAM and dual 5 1/4” floppy drives, I thought I was big time!

@NopeOnARope_ 5 месяцев назад

386. I had a 486 and recall it had ps/2

@NopeOnARope_ 5 месяцев назад

Come to think of it, I had a 586. Win98se, Netscape, ICQ, and You Dont Know Jack: The Ride. Good times. I started on Apple II, but never owned a pc till I BUILT one from scraps. TA-DA! 586. Of course Pentium was already out, and we couldn't, for the life of us, fathom how the heck anyone was going to fill an 8GB hard drive. Holy cow that was a ton of space.What I would give to go back to the time I built my first PC. Oh the things I would prioritize learning over just letting my curiosity dictate what I learned. The things I would do differently. The appreciation I would have for a brand new, innocent, uncorrupted, fully free (libre) internet in all of its current glory and potential I once took for granted. *sigh* It really was magical.

@Nebbia_affaraccimiei 5 месяцев назад

was a transition period. some 486 had ps/2 some pentium 1 didn't!

@LearnElectronicsRepair 5 месяцев назад

@@Nebbia_affaraccimiei True - I found several Pentium 1 boards with AT keyboard connectors, and even one AT form factor PGA 370 (pentium 3) motherboard!

@androxilogin 5 месяцев назад

Fingernails are tools.

@2009numan 5 месяцев назад

I'm sure its a PC

@chrishartley1210 5 месяцев назад

Why are you seeing so many? People have found out they won't be able to upgrade to Windows 11.

@LearnElectronicsRepair 5 месяцев назад

Haha PMSL!

@migsvensurfing6310 5 месяцев назад

Yes they can. Unofficially. Watchh the channel explaining computers, he made a video on the subject recently.

@chrishartley1210 5 месяцев назад

@@migsvensurfing6310 No, not on a 486. Not enough processor bits

@migsvensurfing6310 5 месяцев назад

@@chrishartley1210 Thats true. I thought you were refering t o in general today. I think an old 486DX runs out of luck after Win 98 or Win XP 32bit version.

@perkulant4629 5 месяцев назад

Fingernails are a tool. People are weird these days.

@twithheldmwithheld8938 5 месяцев назад

I agree, please cut your nails. The dirt and potential bacteria under them is not healthy. Plus it's an appearance thing. Although it hasn't stopped me from watching and enjoying your videos, it does bother me...