IBM PCjr Repair and Restoration
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- Опубліковано 10 лют 2025
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In this episode I restore an IBM PCjr back to original condition, and repair a faulty monitor that was damaged in shipping.
"I'm using a very high tech tool here, it's called my pocket knife."
I love this man.
He's the physical embodiment of a dad. He was born already a dad. 😂
I hate this guy tho
Lol
9:38 time!
@@beedslolkuntus2070 Who?
1:12 first time I've seen that actually work.
The amount of kids in school, whacking the CRT, just to make the computer work faster, was astounding.
Whacking the CRT to make the computer go faster? Wow.
“Hey, I think my computer has a virus. Should I hook up a CRT and whack it to get rid of it?” :-D
Wowwwwwwwwwww! Kids were stupid.
But it didn't work faster? It just worked!
Simon Christensen In Texas, our teachers would come to your house and whack your computer monitor and see how you like it
Kicking the xerox works likewise :)
“Old computers need to be handled delicately and with care by experts with the correct parts”
DJ- I’ve got a knife, a paper clip and a multimeter
Psssht, thems is luxury tools. Back in the old days all we had was a sharp stone, a bottle cap, and some engine grease to fix our cracked PCBs.
“Somebody get me some markers, some construction paper, and some GLITTER GLUE!!”
@@williamreid6255 I can't not read "glitter glue" in the stereotypical gay voice
@@williamreid6255 MACGRUBER
don't forget his fists he hit it to get the screen to turn on for the first few times
I lost the ability to hear that high-pitched sound years ago and I'm just 21. One day I invited some friends over and decided to show them my late 70s computer. As soon as I turned it on they began complaining and I just couldn't understand why. One of the rare perks of growing old I suppose.
My parents (almost 50) can't hear any (high-pitched) noise when they turned on their old CRT. That's not a perk, really; losing the ability to hear certain frequencies is very bad.
I stopped hearing anything above ~14500 hz around the age of 15, who knows why
@@MaximNightFury going deaf :)
@@kuirivito Probably
What did you say? 👂
This must be what some people feel like when they see an old car restored to new condition. These restoration videos are so great!
DJ is so positive person. Thanks for the CRT restoration!
"I'm using a very high-tech tool here, it's called my pocket knife."
made me laugh way harder than it should've
Pocket knives and duct tape, man's best friends ;D
@@CanuckGod And WD-40 as well
This brought back so many memories. My first job after graduating tech school was to repair CRTs and keyboards and adjust floppy drives. That was about 35 years ago, and I am now retired, but it was fun watching you all do the job I once did for 40 hours a week.
My first computer was a PCjr. We had the second drive slapped on the top, and a memory expansion and Centronix port strapped to the side, if I recall correctly. Loved it. Loved the cartridges, all of it!
And FYI: If I spill a drink on my keyboard, I throw it in the dishwasher. No heat, very little detergent. After letting it thoroughly dry for a day or two they always seem to work just fine! Might be worth a try in your many projects
I never get tired watching you cleaning old devices. It's so satisfying.
When someone repairs old computer stuff (as well as old TV, VCR, Camcorder, Hi-Fi, etc.) one should leave a small sheet of paper glued inside the box with a log ir order to inform someone in the future on what was found before and what was done after the repair.
That would help a lot in the future when taking decisions when repairing due to future problems.
Also, it has historical value.
Oh pls who cares. Who would buy this junk pc
@@MrTopsoil911 a collector that's who...
@@MrTopsoil911 trust me, it would be handy. Like buying 25 plus year old classic/vintage cars that have the entire service and repair history.. it can be bloody helpful!
@@MrTopsoil911 Why are you here if you think its junk?
I'd say the high pitched whine is coming from the comments section! 😂
Heh, I know. Everyone usually likes trolling the pedantic commenters.
Ba dum tssss
BAM! Nice!
So you cant hear it?
@Upitty Dawg i was kinda joking, my ears get used to it. I grew up on tube tvs lol.
HI David, use a high pass notic filter EQ with a sharp Q to eliminate the noise you speak of, you can sweep the frequencies in final cut pro and pinpoint the problem.That way you can run this preset on every video worry free. Best of luck! 😊 👍🏻
Hey, there's Mr. Meseeks look at him!
Also I'm convinced that Linus's last words will be "OK I'm gonna poke at it now"
? I'm a bit confused.
@@losisansgaming2628 there is a character from Rick And Morty in the scene, and You Tuber Linus has a reputation of being clumsy they kinda inside jokes to a lateral thinker.
@@evanjohnson1299 I know of linus tech tips. I just wasn't sure if you meant him. Also I know what mr meseeks is
@@losisansgaming2628 I suppose it could've been Linus Torvald, or some kid with a blanket fixation.
That came out really well, it was also nice to see how you diagnosed and repaired the CRT, plus also the tips on cleaning the drive etc
The restoration videos are some of my favorites.
It's amazing how simple it was to fix that CRT. Literally just adding bridges to the cracked PCB. It would be interesting to see how that compares to a modern LCD monitor lol
However,LCD Monitors use way less power compared to what the old day CRT ones would
mate, you have nothing to apologise for. your videos are amazing. i love your content. very imformative, very well presented. keep up the good work
❤️❤️❤️! My first PC, that set me on the path to a career in computer systems engineering!
PCjr was my first computer and is my favorite vintage system. Really glad you got one and I can't wait to see your documentary series!
i gotta say im in no way a computer nerd. or even computer savy. im 32 yrs old so i dont even know about these vic 20 or commodore 64 etc. all i watch is car videos and stuff like that. but i gotta say im subscribed and love this channel. watch every video. 👍👍
Looks good brother! This was my first computer back in the early 80's - From what I remember we actually opted for this over a Coleco ADAM.
I’ve been watching a lot of your restoration videos. I enjoy them very much but man you have way way more patience than I have 😀 Keep these coming. Love your channel.
I grew up using a PCjr. Had a few mods to it. 640k ram and an upgraded processor loved that computer. Learned a lot about DOS and basic on it
14:24 is a flashback to elementary school for me. I smiled so much watching this (incredibly satisfying) video. Thank you, and keep up the amazing work.
I like the guy you had on. Normally i get annoyed when youtubers i watch have guests for whatever reason, but he was nice.
i don't mind it when they are physically in the same place, using the same equipment.
what seriously takes me out of it is when they are colaborating over vast distances, using different recording equipment and settings, especially when one of them has significantly lower mic quality than the other i just can't.
suddenly hearing terrible mic echo is just the worst haha
After seeing how busy your schedule is and how long this takes to set up, thanks for making really awesome videos, i love every one of them and have started building my own small collection!
In the UK they fitted speakers near areas that teenagers would congregate and cause trouble, it would give off that whine really loudly so they didn't want to be there any more but older people just doing their shopping wouldn't hear it.
Vaardu I didn't attempt to name the device, because I didn't know what it was called..... Actually.
Clever.
Too bad on UA-cam it just makes complainers complain more rather than making them go away. ;-)
this is regularly done in Vancouver, especially malls, smoking areas, and outside transit stations. I think they are called Teen Screamers.
Max Mouse jokes on them I play high pitched audio into my ears on purpose
But why? There's really no reason. Unless they are stealing or breaking property but at that point some noise isn't going to mater to them. Honestly just comes off as a room full of yes men and "kids these days" people talking about installing these devices and just agreeing with each other. No disrespect intended right now, if you disagree I'd love to have a civil discussion.
I like how at some point you decided "I'm just gonna hit this" and the monitor started working. Percussive maintenance at its finest.
THANK YOU! for this video. The PCjr was my first computer back in 1986. The keyboard you have is the second for the PCjr, it shipped with a chicklet keyboard and the one you have was a free replacement from IBM because so many people complained about the chicklet version.
I wish I still had my PCjr, by the time I was done mine had a Raccore Drive 2 with 512Kb of RAM 2 5.35" floppies, The Voice Card, Power Expansion Card, Mouse Card, and a 20MB RLL Hard Drive. I also had the PCEnterprises jrExcellerator which replaced the processor with a V20 running at 9Mhz. I can;'t wait to watch your documentary on the PCjr.
DJ is freakin' awesome. I don't actually know him, but upon inspection his awesomeness is very obvious.
When you guys booted up the monitor the second time I kept saying "Come on. Turn on for them." Because I love when you can fix old computers :)
I wasn't thinking when I said "come on... turn on, mr tv ..... " I know, it's not a tv, but I was rooting for them. : )
Well, Carlson want exactly the kind of guy who ate glass shards regularly 🤷
The monitor arriving broken is a perfect reason why I don’t trust shipping
I couldn't fix it... So used the outside plastic as a little home for my cat. She likes it. Happier than me for sure...
80th like
@@SweetCandy_3000 Delet this
No
@@SweetCandy_3000 nobody cares which like you got
I love watching your restoration series. Its very satisfying and cool to see you bring these old machines to near perfect original working order
I must admit that your intro is the greatest intro on all of youtube... and I watch a LOT of youtube... that combined with the fact that I love 8-bit computers made me an instant fan...
Yay! Perfect ending to my day! My favorite UA-cam channel delivers again :)
Don't speak so soon, lol any money you catch the missus cheating on you when you get home (with the delivery man)...
While I don't mind the whine myself and think it adds atmosphere to the videos, try using a spectrogram to check for the whine. It should show up as a noticeable spike towards the high-frequency end of the spectrogram.
15:08 High pitched noise? Did I missed something? Where is the noise? I don't... oh... forgot... I'm hearing impairment ^^ SRY
Oh and I take the moment to THANK YOU VERY VERY MUCH for providing subtitles every time! ♥♥♥
It's already hard to hear properly but then in English (I'm German by the way) it's sometimes harder but with the subtitle...
I think that's one of the few things where I just can't show enough how much I appreciate it!
I really know how hard it is to provide subtitles on UA-cam, I did it once on a 2min video and my first thought were "OMG why does YT make it so complicate or is it always complicate to do them"... so thank you very very very much again ♥
ThePrinzKassad I’ll make sure to try to add subtitles to every video I see now, you reminded me that there are people who are less fortunate than I am and can’t hear very well.
Yeah, subtitles also help people that can't play the audio, they also work as a wonderful base for translating, since you can use the current English ones and change it up, sentence-by-sentence.
David (aka 8-bit guy) - another beautiful video. Fascinating to watch! I love your professionalism, modesty, and honesty. Keep up the excellent work! Marius (from Warsaw, Poland)
I don’t know why but these restoration vids are deeply satisfying to watch! Satisfies my OCD...
I love how people complain about hearing the sweet sounds of crt, i actually like crts for that noise.
I know this is an old video... That's probably one of the replacement keyboards that IBM offered to people that hated the chiclet keyboard. The original chiclet keyboard matched the case color. I think if the chiclet keyboard were issued today, it would have been fine and no one would have complained. We're all used to them now.
When I was your age I was still able to hear at least as high as 15khz, I remember being able to hear the flyback transformer in CRT TV sets. But my ears are now 23 years older than yours and even THAT frequency is a bit higher than my built in low pass filter!
BTW, I didn't know that UA-cams frequency response went that high!
Also, I remember hearing the 20KHZ+ squeel of the alarm system in the American Museum of Natural History's gem exhibit as a kid!
wait you’re in your 60’s? damn
I'd love to see the full PC jr doc! It was Christmas 1984, my brother and I had been begging for a Macintosh. We opened the "big gift" to find... a PC. In the long run, I was actually grateful. This is back when you'd copy BASIC code from computer magazines, I learned a ton by reverse engineering. Won the 1985 Pennsylvania Computer Fair by creating a rudimentary drum machine (using the onboard saw and noise waves) that let you program and store sixteen 16-step patterns. Truth is, I didn't know there was such a thing as.a drum machine, I just wanted to practice guitar to something.
But yeah, it's too bad about the PC jr. Kind of a Greek tragedy, where a king's avarice and greed cause a downfall.
40 year old retro nerd here. I also never noticed any high pitch sounds in any of your videos :-) I can confirm that us older guys just can't here it. I have some old systems as well but I am envious of your collection :-)
when you showed the hose I was like ”wait they had those back then?” and then I realised i was dumb.
Man, must have been tough cleaning things in the times before hoses
I love the old CRT HV "Whine" at 6:22, reminds me of the first computers I used :)
Thanks for the timestamp. I can hear the initial high pitched pop, but not a continuous whine. Even then, I can only hear it in my right ear. I used an app sometime back that was supposed to be a tinnitus treatment, and it let you dial up the frequency until it matched the ringing in your ears, and it just so happens that my tinnitus is right in that 15khz range. The app didn't do crap other than that. :(
I'm just glad I still have enough of the hearing range to hear that
Interesting. Is your hearing damage localized to just that spot, or is it everything above 15KHz?
Niarbeht That frequency range and higher just seems to blend in with the tinnitus. Right about 15.3khz was where I couldn't discern the two sounds.
I'd say, "Sucks, man", but I'm pretty sure there's not a lot that's useful up in that hearing range.
DJ: I'm not an expert on monitors
Also DJ:
This little computer will always have a place on my shelf! It was the computer that got me through my senior year of High School my beloved CoCo just was not up to the job anymore! These computers started me on a long career with all kinds of computers!
I’m happy I found your channel. I was a fan of the Computer Chronicles back in the 80s. Thanks for all your hard work. 👍
7:45 That's right, screwdriver! Your grounded! Go to your room!
XD funny nerd joke
Dear 8-Bit Guy,
I'm a big fan of yours and *please* don't take this the wrong way, but I urge you to add a big fat warning and disclaimer to this video. The way your guest powers up the monitor while its parts are exposed, poking around with it in the process, is REALLY DANGEROUS. ⚡⚡⚡ There is some *serious* high voltage running through those components! I'm sure he knows what he's doing, but many people who are watching this video do not. Please tell people to be very careful and to take the necessary safety precautions before they attempt repairs to a CRT monitor. 😮
Other than that, great video as usual. Keep it up! 😃
+ExtremePragmatist You would have to be pretty stupid to see this video as a comprehensive "How-To" guide.
I think his subscribers are smart enough to not just poke around electronics willy-nilly.
ok although its not a how to guide, this info is still really important to people who are repairing CRT monitors
Ok, well done on the warning, it makes sense and you are absolutely right, but if you're warning someone of something legitimately dangerous don't use emojis, it'll stop people from taking you seriously.
I don't even try to work with them. A friend and I are trying to fix a TRS-80 Model 3 and I let him deal with it because he knows what he's doing.
@@cosmicjenny4508 well, the very retarded reason why some countries have bigger warning label, because there always be an idiot.
I loved the repair idea. Seems to work well. Was there something that caused you guys to go this route rather than just soldering jumper wires between the components (bypassing the traces completely)?
That is what I would have done under normal circumstances. But DJ thought this method was better.
I am a very novice engineer but what comes to mind is "high voltage" or "high frequency signalling". Those two always seem to be picky in their "routing". While the wires would be more robust in amperage, just sheer resistance or length could have major influences. I'm with DJ. Just my two cents.
David I figured that was probably the case. I was mostly wondering about the board flexing and breaking those joints again at some point (since the board itself was not reinforced or glued back together).
It's definitely a concern - the board is obviously still cracked, and the flyback assembly is obviously still heavy. However, this monitor may never again see the kind of abuse that it was subjected to during shipping and handling. And, like Christopher mentioned - since the traces are mostly related to high voltage, keeping it close to the board, and with the same routing is advisable. What David didn't show in the video is that first we tried just to bridge the gaps with solder - on lower voltage signals, that tends to work, but with HV it can be hit-or-miss. So we went back with the tried-and-true paperclip trick. The paperclip bonds well with the solder, provides some mechanical stability in the joint, and provides a solid enough trace repair for the HV to be happy.
Also - David mentioned to me that he thinks someone else had the monitor apart at some point in the past, and failed to get one end of the board into the support rails that are molded into the back cover. If that was the case, then the board would have been out of place, and free to flop around. Even still, these old phenolic single-sided boards are not well known for their durability.
The way You deal with little details like the IBM label, makes it really special! :-)
IBM PCjr was our family XMas gift 1984. Limited right out of the box compared to the IBM PC, but got us through High School, practiced BASIC programming, dialed into Compuserve and BBS and generally had fun. Learned word processing and Lotus 1-2-3, which earned me a lot of pizza and rounds of drinks typing other people's papers in college.
DJ is a bloody surgeon. Next time you get him on you should hand him a lab coat or something. :D Amazing video.
I'm 46 and can still hear that high pitch from CRT tubes and regular power supply bricks, and other stuff. I usually notice a sore painful feeling in my ears first, which draws my attention to where the sound is coming from. I've been in rooms and pointed out the sound to people, and they always shrug their shoulders and cannot hear or feel anything. However I have tried to take care of my hearing over the years with ear plugs while at concerts or mowing the lawn etc. I play guitar and do studio recording and always do this at a low to medium volume.
It depends on the person, too, some people's high frequency pitch detection degrades at faster rates than others, independent of any other factors, though the fact that you've taken care of your hearing definitely helps prolong that. For what it's worth, I'm 40 and can still hear 15.6 kHz CRT humming clear as day, but it might be another story 10 years from now :D
I'm 51 and I have noticed such noises even recently. on occasion. I wonder if my Asperger's has something to do with that.
I'm 10 and I can't hear it
People watching old tech videos and complaining about high pitch noise. Well I don't know what to say...
Lucky (or unlucky) for me, my tinnitus is so loud I couldn't hear if there was a noise to begin with.
the crt sound that makes your ears bleed.
The CRT noise wouldn't be as much of a problem if it was on the whole video, but since it comes on and off (well, when David forgets to remove it) it makes it really noticeable and annoying
@@UraYukimitsu I don't seem to notice it on video, but I still hear it IRL.
One Doomed Spacemarine it’s probably UA-cam audio compression messing with the frequency
DJ's got both looks and brains! I'm definitely gonna steal that paperclip trick for my own fixes from now on.
That mock badge was so satisfying! You have the perfectionist's seal of approval for that, amazing job!
There is no such thing as a mock
You can't make things up
Everything IS real
This is my favourite UA-cam channel.
Great video David, also great work by DJ, well done. You, LGR. Metal Jesus Rocks & Classic Game Room are my favourite UA-camrs. Nice work.
Famous DJ quotes
"Got my very high tech tool here its my pocket knife"
What a legend.
Anxious and excited to see your full documentary on the PCjr.
i need 500 more of these videos. I stumbled upon your videos last week and I'm already almost through all of these haha I love watching them before bed, it's a great way to unwind.
I'm worried Nicholas Cage might kidnap The 8-Bit Guy because he truly is a national treasure.
I'd like to amend that to "International Treasure" as I'm from Denmark, and i love his videos.
Don't worry Cage will start with himself
dude your videos are the best i love your work keep it up i mean it
"I'm using a very high tech tool here. It's called my pocket knife"
XDD
I had a PCjr exactly like this in 1984. The monitor had a short or something in the picture tube. It would flicker and suddenly turn red after it warmed up. Whacking it would fix it temporarily. It was replaced under warranty. Seeing this brings back memories. I liked the PCjr and it was fun to play with but I think it was a pretty useless piece of equipment. Not powerful enough to run business programs and there were limited programs you could buy for it anyway. But it was a very well-built machine and the keyboard was great. Years later I bought an actual PC compatible for college, and that was a very useful machine. Pulled many an all nighter with it. Even used it after college until the mid 90s when Windows 3.1 programs overtook the old DOS stuff.
My goodness, the label was identical! It's incredible how good you are at replicating stuff like that.
What ever happened to the PCjr documentary you mentioned 4 years ago? I collect PCjr games.
I read the title as ICBM Repair and Restoration and nearly freaked out..
What is ICBM? IBM ripoff?
@SG-014 yikes
@SG-014 Oh, shoot!
Ouch
Retrobriting an ICBM might be hard
"When it doubt, hit it." -IT everywhere
I'm 30 and can still hear the high-pitch sound. I can't wait for it to go away!! But FWIW, you got it all this time. Thanks!
I still have one of these machines and I don't recall a high pitched noise from the monitor. I do remember something making a noise, but there were no fans so it couldn't have been that.
Making old computers (game consoles as well) look and run like new again is so satisfying.
I think my childhood of using crts has burned the sound into my ears so I always hear it l. Or I just have tinnitus.
probably tinnitus although you may be right when you say it burned into our ears...
Tiago Costa tinnitus is likely because I have visual snow, which is often accompanied by tinnitus. And plus I haven't had that much time for it to burn into my ears as I am only 15.
Haha, I think I'm experiencing the same thing. Put on headphones, try to play a tone much above 15 kHz, oh is that it? Nope, just the tinnitus. :-D
Darn. When I was little I could definitely hear the CRT whine from TVs. Could tell they were on even without looking or having the speakers on.
TravisTev I can still hear the tv's fine but I just constantly hear a higher sound at a lower volume.
TravisTev I also have that problem at the doctor when they test your hearing by playing a very high pitch sound. I'm always thinking I heard it but nope.
That PC Jr is cleaner than my 18month old PC, im lazy gotta dust it out. Ive never heard the CRT whine you speak of!?!?
David T Me either. Not even when I was a kid and used computers and watched tv and played video games on a CRT tv's. No one ever heard any "whine" sound or complained about one coming from tvs or monitors.
It's all about how good your hearing is. 15khz CRTs like the one in the video and most TVs emit a 15khz whine. Some people can hear that high when they're younger, some can't, but most of the time it seems that good of hearing goes away sometime in your 20s.
Personally I don't even understand why people are complaining about it; maybe I'm just used to it but I don't really care about it.
Thank you 8jr Guy
Feeling stupid. I just found one of these on the side of the road that someone threw out. I was so excited to get my hands on my first vintage computer. There was even a floppy disk inside, my first time holding one of those. I could not for the life of me figure out get the damn thing open to see inside. Then I saw this guy just lift the top cover and I got mad "hey, you didn't show me what you did to get the cover loose." I went back to the computer and held the edge of the cover and pulled it open. It was so simple. I opened so many computers in my life and this was the one that stumped me!
A audio spectrum analyzer is a must have for audio editing such as high pitched CRT sound, 8bit guy!
Im a hobbyist producer, and youll be suprised the goods of an analyzer. These days there are tons of free ones I believe in either VST, AAX, DX, or RTAS and so on!
I hope ive helped you with that!^^
I find these videos interesting.
I like it.
I don't see why people dislike the CRT whine, it doesn't bother me. Maybe because I still use them daily?
Mr. Dead Inside it doesn't bother me too much either but I'd rather not listen to it. Some details I have used don't make a noise like the Macintosh plus. I don't know why but I just don't hear it.
I used to listen to loud music all of the time (like literal earrape) a few years ago, so unless a CRT is facing away from me, I can't hear the whine in the slightest. Also, fun fact, the whine is at 15750Hz (15.75kHz), which is the horizontal refresh rate of the monitor.
I had one in my school for the entire school year it was a tv making the noise in fact all the TVs where making that sound it gives me a headache
Because it hurts my ears.
i like the whine very much.Cause when i was a baby i dont cry on those whines.Now some of my young cousins hate that whine.
5:27 WHERE DID YOU GO 8-BIT GUY!!!
evaporated
Presumably went behind the second camera
Planet X3 development
Probably he was running another program and he hasn't got enough ram to appear in that scene.
Retro bryting
Edit: I can’t spell
I live in Fort Worth and I can easily tell you guys are locals based on your dialects lol. I enjoy watching your retro restorations; please keep it up!
I love seeing the fixes to make these old computers work again.
Hooray for being 40+! No more 44Khz issues!
I turned 40 last August!
Christopher Born I NEVER heard any noise from CRT tvs or monitors even when I was a kid. So explain that to me. I would use computers at school and then play video games and watch cartoons all day at home all throughout the 80's and 90's on a CRT tv and never heard any whining sound. NONE of my friends ever said anything about ever hearing weird sounds from a tv or monitor either. So why NOW are people complaining about it? Isn't it more likely that it's just Millennials being special snowflakes and finding something new to complain about?
ct92404 I always heard it, even into my 20s. I couldn't stand that fly back transformer induced noise from CRTs, so much so that I had to return a particularly loud Trinitron in about 2004. Maybe your high frequency sensitivity is/was different? If you turned up the volume, you could drown it out, but I always got yelled at by my parents for turning the old Zenith up so loud! Tdcat has a good video on this whine, and covers what David showed in this video for removing the frequencies: in Pal--15625 kHz, 15734 kHz for NTSC--multiples of scan line frequency and AC frequency.
I was always able to hear it, too, but if you sat far enough away from the TV/computer or turned the volume up enough it didn't matter. Some CRTs were worse than others, though.
A wireless keyboard in the 80s?
Yes and they were notoriously troublesome. They used infrared and you have to have it lined up just right.
That's what I thought!
I had a set of wireless NES controllers. IR was the tech used in most of these applications. It was unreliable, but we managed.
Yup - the same tech most TV remotes used/use, on that note.
They also used a cable to connect to the PC if you didn't want to use wireless. I believe it was literally a phone cable.
8-Bit Guy, try using a 15734 Hz notch filter to eliminate CRT whine! This frequency comes from the 525 lines x 30 frames x 1000/1001 scan rate of a CRT in 15khz/NTSC mode. This would eliminate whine without dulling the audio.
Elliot Clark that is how one sounds though
Totally eliminating the whine is inaccurate. It is part of the experience of using a CRT (at least those which run at TV scan rates), just like the static electricity and heat they generate. I'm a little too old to hear the whine now, but I _can_ hear the audible degradation caused by the filter that tries to remove it. Reducing it by just 6 dB (equal to cutting its volume in half) would be a good compromise to appease the whining about the whine while not eliminating it entirely, and thus also being more accurate to reality and causing less degradation to the rest of the audio.
I was going to suggest a notch filter (as opposed to the “remove high frequencies” or low pass filter he showed) as well. Great for removing constant hum, but I understand why some would want to leave it in.
I am surprised that 2 replies were about this comment because they knew what it was. I do too but I was about to laugh.
If only you could remove the CRT whine in real life...
Man O Man!! The level of Patience you have! 😱😱😱😱😮😮😮
I've watched this a couple times along with the unboxing for February, and I think the extra top cover was to replace the sticker on the keyboard. Your fix still turned out looking really nice still!
The reason the keys haven’t yellowed was due to it being made of a different plastic, if my memory serves me I think it was LDPE as opposed to the fireproof treated case plastic, this was standard practice for IBM as seen in other PCs of theirs from the time.
Not to be pedantic but I and a few others would have preferred you to have peeled the serial sticker of the keyboard instead of cutting it open, it’s a rare computer that commands a high price due to the short time it was on the market.
eh it was just the barcode and htere probably isn't a machine in existence anymore that knows what to do with that barcode anyway.
Also there was no getting around damaging the label to get the keyboard open, this was a common practice to void warranties and identify tampering. Those labeles are EXTREMELY difficult to remove without damaging them. THe best you might be abl e to do is to try to steam it off, which is still going to damage it at least a little.
"I'm using a very high tech tool here it's called a pocket knife" lmao
I still smack my electronics to get them to work as a last resort... does the trick at least half the time
My Trinitron crt is failing with immense flickering on boot. I need to wait like 30 minutes for the monitor to settle and work. Kinda nervous about opening it up and fixing it myself. This video did give me some insight though! Love your channel, been a long time fan :)
15:55 Thank you for doing this. I can't be around crts because of that, and even remember hearing it from ones that were switched off. It's a sensory thing, and super uncomfortable. You're doing everyone a service either way. Again, thank you.
90% of IT hardware solutions. Switch it off and on again or give it a good whack.
Percussive maintenance
Believe it or not, one verified solution to Apple IIIs crashing is to lift the computer a few feet up, then drop it.
1:10 Oh yes, good old fashion percussion tuning!
1:12 "Kids, hitting the computer wont make it work"
My Dad used to be a TV engineer so I spent hours as a kid just sitting there watching solder clouds and things pop and do all sorts of CRT goodness and see repairs like this.
I've kept my IBM PCjr to this day. It will need the same restoration but very good memories from this machine; learning BASIC language and King Quest to name a few. I had a very cool mom to walk into a computer store with me and purchase what I told her I really wanted for my birthday. Actually not out right purchase but actually fiance and make payments for me when I was turning 13 years old in 1985. Yes it was at a big discount and a free monitor with the failing sales of the jr but we didn't now that back then. It still turned out to be a better platform for me to learn on then the other options out there and would not go back and change this purchase if I could. Thanks mom (RIP)