My first 12” black and white tv had a white dot minutes after turning off... My parents knew this so when I heard steps on the stairs I was already to late 😂

@adriansdigitalbasement

3 жыл бұрын

Hahaha foiled by a bad design!!

@Wewewea

3 жыл бұрын

Too*

@EzeePosseTV

3 жыл бұрын

@@Wewewea No, they were correct by saying "to" .. By being a grammar nazi, you made yourself look like a muppet!

@Wewewea

3 жыл бұрын

@@EzeePosseTV You’re obviously wrong. ‘To’ is a preposition and ‘too’ is an adverb.

@EzeePosseTV

3 жыл бұрын

@@Wewewea Turning brightness to 0/zero is the correct way to say it. But saying "turning brightness too 0/zero" makes no sense. Google, Bing and Duck Duck Go agree with me. Just like saying "I'm going to work/going to correct you/going to turn my volume to 0/zero" am I wrong?

Adrian has this 'never say die' attitude, that you gotta admire

@crimehouse8851

3 жыл бұрын

I love it. It keeps me going on my projects that I have come to dead ends on of my own.

@uni-byte

3 жыл бұрын

Agreed. Something I used to have, but it has waned somewhat in the past few years ... sigh!

@itsnouse-yourswillbeastill2562

3 жыл бұрын

If he had been a doctor he'd go the way of Dr Frankenstein for sure.

@crimehouse8851

3 жыл бұрын

@Michael O Callaghan I tend to buy things from either local flea markets and thriftstores, or even ebay that are broken, just to try to fix them. lol

@crimehouse8851

3 жыл бұрын

@Michael O Callaghan that hows ya learn. or at least how i did. Right now im working on a NES console that someone lifted 80% of the traces on cuz they didnt know what they were doing. I told them i could probably fix, but now they know not how to do it lol

"Out, damned spot!" --William Shakespeare...

@kai990

3 жыл бұрын

at the drycleaner?

@tomf3150

3 жыл бұрын

Vamoose ya little varmint !

@knghtbrd

3 жыл бұрын

I was going to go there, but you beat me to it.

@frazzleface753

3 жыл бұрын

"Begone, thou foul, malingering spot!"

@alexdhall

3 жыл бұрын

@@knghtbrd Ditto. Like minds think alike! That line is also from Macbeth, FYI.

Adrian's gonna have that thing running at 800x600, full color, with a GUI driven Commodore BASIC interface by the time this is all over! :)

@ShanghaiFlyer56

3 жыл бұрын

Then it will gain sentience and kill us all! No, Adrian no!

@Okurka.

3 жыл бұрын

Replace the mainboard with a Raspberry Pi and the CRT with a 4K LCD panel.

@handsolo1209

3 жыл бұрын

@@Okurka. That would be blasphemous to such a beautiful and classic computer to put that crap in it.

@WilliamAndrewPhilipBodie

3 жыл бұрын

yeah but i bet the spot will stil show up :_:

3 жыл бұрын

Adrian is gay? Awesome! No have many gays in old eletronic

Excuse my language, but holy fucking shit. My dad has a older model PET 2001 where the bright spot has bothered him for the last 15-20 years. When mentioning it, its all he ever talks about and how he could never get it fixed. I'm going to "borrow" his PET '01 and apply these fixes as a Christmas present. Thank you so, so much Adrian! Greetings from Norway!

This man is a professional, despite not having degrees in electronics.

The diode wasn't zen enough, I need a zener diode ... Ok, I'll get out ...

@TechnoTinker

3 жыл бұрын

One that's not so prone to breakdowns?

@Wielblad95

3 жыл бұрын

Puns are art by my book and have to be appreciated. That one was quite good!

@countersurprise

3 жыл бұрын

😂😂😂 I assume you’ll let yourself out...

@Kylefassbinderful

3 жыл бұрын

no no, don't leave. I'll be here all night. Please, stick around. I can't resist a good pun.

@physnoct

3 жыл бұрын

@@Kylefassbinderful What happened to the overheated magnet? He gave up the Gauss.

I have never in my life felt so much suspense over a dot. 😂🤣😂 Thanks for the great video!

You are the retro-world's best troubleshooter.

@danilko1

3 жыл бұрын

The thing is, while he's trouble shooting, he's not an engineer, he's learning along the way. We are picking up, what he's putting down. He tries, isn't afraid, and this is working out well for him and the rest of us.

It was now a matter of principle, to eliminate that spot!!

Man vs Dot! - new exciting series!

I've never been so on the edge of my seat while awaiting the arrival of a spot! Except maybe that time involving a pregnancy test?

What a rollercoaster. Every time I was holding my breath, waiting to see if the dot appears.

I think the spot was the PET's soul and you killed it :( :D

@darthrevan2063

3 жыл бұрын

Job's Garage well that got depressing fast

Adrian, I would strongly suggest replacing ALL the electrolytics. As you noted, the ESR of those caps are pretty bad. They are after all 50 years old. Heat and age are not doing them any favors.

Adrian, at times you are really 'hardcore'. That spot must have REALLY been buggin' you. Good work!

For a better and more in depth technical explanations of the cause of the spot and the fix, please watch Frank's (IZ8DWF) video on the subject: kzread.info/dash/bejne/iYmArNqrgc63lco.html Update: Chuck has applied the fix to his monitor as well, see his results here: kzread.info/dash/bejne/m4GHs7Z8lKaTmso.html

@only257

3 жыл бұрын

🎃

This is very interesting - I have a 2001-8 with chicklet keyboard and tape which I've had since 1979 (well, my dad bought it but I commandeered it!) and needs refurbing someday. I'll keep a note of this video for when its time comes (which hopefully will be 2021!) I remember back in '85 when I last used it I would get a faint spot a few seconds after turning it off (only really visible in a darkened room) that lasted for a minute or two. Since its been unused for ~35 years its going to need a complete refurb and I will put in the mod and check the 33v Zener! Great channel Adrian, I found you through one of your earlier PET videos. Theres not a huge amount on KZread with these PETs, most of the attention these days is on the later more glamourous machines, but I learnt to code on my (*cough* Dads) PET and the skills it taught me have been good to me in my working life. On another note, are you trying to collect ALL the SIM RAM in the world? :D Say Hi to Rammy for me!

My parents used to admonish me for watching too much Tv as a child (40+ years ago)......."You would watch the dot" they would say....now i know what they meant !!

Hi Adrian, thanks a lot for all this amazing content you upload. I’m 20 years old, I’ve never seen, used or even heard of any of the devices you show in your videos but somehow I can’t get my eyes away from the screen from the moment they begin to the moment they end! It never happened to me before, I guess that’s what happens when you find a genuinely interesting and talented youtuber.

I can't express how much I enjoyed this video. I really appreciate your perseverance. It was an amazing journey. Thank you for taking us through it step by step.

More ups and downs than a thriller movie!! Nice work.

That model with the chicklet keyboard and built-in cassette drive was where I first saw the "Hunt The Wumpus" game. I recorded the tunnel connections onto paper and wrote my own version of the game using just that information along with the knowledge that there were exactly two pits and exactly two caves with bats. 😄 Anyway, grats on fixing the problem.

Adrian your perseverance is so high that you really inspire other people to be like you. Good Job!

Thrilling as a sports match! I was actually shouting out loud "Ohh nooo!" when the capacitor didn't fully fix it. Great to see you getting to the bottom of this. Well done!

@MrChrisRP

3 жыл бұрын

Funny enough, the entire time of it not being fixed (at this stage I mean) I was screaming in my head - get to a cap dude! I was for sure that once he did, it was a done deal. hahaha

Just did the mod of changing R2 2k2 to 470R in series with 8.2 zener on a 3032 PET. The rest of the components are already at the correct values. The annoying spot has gone. Thank you Adrian and Frank!

Glad you persisted with it. After following the first part I was disappointed when I saw the Pet reassembled initially but not fully fixed.

The flyback transformer was the first thing I noticed being different.

Hahaha, I love it... using a desoldering station till solder. The irony and upright frankness about doing so. That settles it, Im sending a Christmas present.

I don’t know how but Adrian suddenly got me interested in a pesky spot in a ‘70s machine that I never really cared for. Love you Adrian for making such engaging content and providing so many hours of great entertainment! Keep up the great content!

Glad you finally got this fixed and what a way to end 2020. Never before in KZread history has staring at a black screen been so exciting.

I love this troubleshooting adventure and great investigation and explanation. Personally I'm lazy and would have just lived with it as I've never seen an original PET with any burn-in from 'the spot', and I actually find it kind of charming, like some ancient TVs that did this when I was a kid. I have a next-gen PET, a 2001 (3032) "Professional Computer" and it does not suffer from the spot though.

Fair do's Richard Dreyfuss. Your tenacity earns you a subscriber.

Fascinating. I wasn't sure that you were going to find the solution to this problem. But then again, who am I kidding -- great job -- and process duly noted. I have two PETs yet to be tended to and I will be sure to remember this great solution. 👍

Such patience. Time to dig out my PET and get it fixed too.

It's funny that as this came up in my feed I am working on editing my video about fixing an IBM 5154. So, I have something very relevant to watch while I wait for rendering to happen. Thanks!

This video was extreme satisfying. I’m glad you never gave up on fixing it

unrelated, but one of my family's last TVs lasted about 12 years, until we replaced it with a flat panel we got from a family member, we replaced it because it was taking upwards of 2 minutes to warm up, when usually it only takes about 10-30 seconds. it was a zenith i believe. I think that's very good life for being turned on for at least 14 hours a day for 12 years, and knowing my dad, we probably got it used so add that on top.

The 'R2 -) On all revisions, replace resistor R2 with a 8.2v Zener and 470 ohm resistor in series' fixed my 2001...thank you

Great mini-series, I am now emotionally invested into the state of Chuck's PET, hope the fix works for him as well!

What an ordeal to sort it out. Great work. Next how about a Mod to convert the display output from the CRT to a more modern LCD display.

Adrian, I don't own a Pet but Your commitment to solve the problem is simply remarkable

23:39 I had a Mitsubishi TV from the 1973 with that instant-on feature. It did run the heater at reduced voltage so didn't cause any significant tube life issue. The TV got scrapped a few years ago, just because no-one wanted it, but it still worked! 33:12 I've never thought to keep a dead parts bin. Mine would be very full indeed by now, mostly of smelly electrolytic capacitors.

I own both a chiclet 2001 (1st revision analog board) and a 2001-N (2nd revision analog board). After applying the spot fixes according to your video, the 2001-N has been spot-free for a year now. I can't draw a conclusion on the chiclet 2001 yet as I only got it properly running a few days ago, but so far the fix seems to do its job very well.

Never had so much fun watching a spot .We need this to a be yearly event , spot watching 2021.I'm kidding of course , great vid . I hope you and your viewers have a great year in 2021

Hi @Adrian's Digital Basement, another great video, I love problem solving videos, it is nice to know I am not the only one that has to spend ages fixing issues like this, looking forward to the next one. 👍

Great work Adrian! I can imagine how much work it was to fix this. Sometimes things are looking so simple in the videos, like it took 10 Minutes to fix it, but sometimes you have to try it again and again and it actually takes months. I know it too good :) Thumbs up!

The drama that comes from the waiting for the dot to appear is fantastic. Thanks for another great video.

West of house You see an interesting house with a locked door. There is a mailbox here full of packages. To the north you see a basement entrance. > Enter basement. A SPOT HAS APPEARED!!! >

No joke, one of the most rivetting and thrilling set of videos I've ever watched on KZread. A retro electronics drama like no other!

Really excellent video Adrian, fascinating stuff and pretty awesome to see a working fix in the end!

This really gives a new meaning to a Spotfix on your computer.

A big piece of cheese cake, a big cup of coffee and Adrian's Digital Basement - I like my birthday now! :)

Perseverance pays off in the end. Great Job!

I love when you find a solution for a problem! Congrats!

Really enjoyed this. Glad you stuck with it and persevered.

The "dot" is residual charge left behind somewhere and released (discharged) into the monitor, the trick would be to find the part of the circuit that is responsible for fast discharge after the monitor has been turned off. The voltage affects the X/Y positioning of the beam, so... technically that could be a thing too.

Great content. You do not give up fixing a problem until it is solved. I like that. Keep it up!!

This was a thriller with a lot of plot twists. Very interesting, thank you!

I love watching the methodical way you troubleshoot these problems, Adrian! It's great to share a part of the satisfaction once these tricky bugs are sqaushed. Great work as always!

Hey Adrian, I haven't seen anyone commenting this nor heard it in your video or description (unless I missed it), so since you seemed not really ticked off at the higher value, here is a quick tip with capacitors, if they read above their rated µF value, especially that much higher, you can be sure the capacitor is bad and needs replacement, only way it can be an overachiever is by leaking electrically, aka, it's getting shorted, taking longer to discharge, appearing to have a greater capacity than it should. Hopefully this little tip can help you diagnose things a little faster and with more confidence! This might save you from a magic smoke show some day hah. Cheers, -Noma

15:30 The left PET 2001 is a personal computer, the other PET 2001 is a professional computer.

@KronK0321

3 жыл бұрын

Nice catch!

Great video Adrian, well done for finally fixing the monitor issue. Keep up the great work!

Your determination is admirable as all hell. Bravo good sir.

Well done Adrian, nice to know what the actual problem was, cheers!

You have the dedication of a scientist. Very well done!

An awesome effort Adrian... well done.

I said "One hour latairrr" about 15 seconds before you added that in.

Wonderful diagnosis and great information.

Im always in awe of the efforts and time you devote for such a noble goal of maintening those pieces of history, kudos sir keep them coming, always very enjoyable. ( and kudos to the wifey too for enabling you for our enjoyement xD )

Realy fantastic your perseverance to fixing that problem. Congratulations!!!

So youtube commentators noticed the spot on your monitor, which is perfectly normal for the crt's of the era, but they don't know about it because back then their parents were in elementary school. They told you that this is indicative of a fault and your CRT will explode. This is not true and they told you that either to have a laugh at your expense or to boost their paper-thin ego and pretend they know something about something. And now we have 2 very entertaining videos, and you spent month trying to fix a non-issue and finally fixed it.

4.4K likes, 43 dislikes, yep I think that sums up how enjoyable this series is. I'm very much an electronics newbie though I used to build computers to pay my way through Uni in the 90s. This would be beyond me but I've learnt a lot. Thank you.

Nice congrats that you finally fixed it! Nice job documenting everything hopefully this helps other pet owners with this annoying problem

Wish I could give you 10,000 likes! Congratulations. What a quest :D Nice job to all involved but Adrian your persistence is what solved this. I find this type of content so satisfying it's like defeating a boss at the end of a 200hr game.

This was a GREAT video. It really shows how such a seemingly small issue can eat up so much time.

what an amazing example of archaeology!! tracing previous repairs from another era, beautiful stuff

Sweet victory! Congratulations sir.

Don’t be so sure about the spark gaps... unless they’re sealed, dirt and corrosion could get in the space between the gap, causing leakage.

15:27 - the differences are down to yours catering to the home/personal market the loan one catering to the professional market, the green screen was considered to reduce eye fatigue, the keyboard also was a better design (IIRC they where hall effect switches rather than the traditional mechanical ones)

Excellent TUTORIAL!

Yay, Adrian! I am glad you found this issue with that light spot. You are like the Sherlock Holmes of circuit troubleshooting!

That was great, one of the best troubleshooting vids I've seen. I'm old enough to have, in a previous life, to have been CRT TV repairman. This brought back memories.

Excellent work! My 2001 has a very nasty spot so I should investigate this.

That is the best feeling ever, working on something and trying diffrent things multiple times, and FINALLY fixing it. 😃😃

Well done... "Out damned Spot" I love this type challenging troubleshooting to resolve a complex problem

One of your best videos.

Nice to see you figured it out in the end! First thing I noticed that was different was the flyback transformer design, as you mentioned, but I just guessed that perhaps Commodore had a different manufacturer for the later ones.

Adrian, you're simply awesome

Nice work Adrian, you've been very committed to fixing this one little problem and I'm glad you got it sorted. (How did this video get dislikes?! Seriously, this is dedication!)

Glad you got yours figured out, crt are a nightmare 70% science and 30% art.

Congratulations on this particular video. It is clearly perceived the large amount of work behind. Researching, exchanging impressions with colleagues or mounting / dismounting the monitors with which you have done the tests.

Like tenacious nitty-gritty approach.

It took me until 33:50 when you mentioned 47 microfarad for C22 to actually realize that it was 47. Earlier in the video when you applied the actual fix, I was thinking 4.7 the whole time. I made a comment trying to correct what I saw and heard but deleted it as you are correct in your video throughout. I am glad for you and enjoy!

Hi. All modern CRTs (I mean transistor or IC driven) had circuitry preventing those kind of spots to happen. And those circuitries always were connected to the first grid of CRT. In other words if you ever face that kind of issue - first thing to do is to check parameters of components connected to the 1st grid :)

What a roller coaster ride that was 😅 Well done sticking with it all this time.

Guess we all had to hang in there... Patience is usually rewarded

Great video as always!

Adrian I received the parts today and got them installed. I did all the mods as well as replacing all the older capacitors. Guess what no more dot!!

Nice job. Keep up the great work.