Yunost R603 soviet TV teardown and restoration 2
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- เผยแพร่เมื่อ 21 ต.ค. 2024
- The restoration of the vintage soviet TV set Yunost R603 (Юность Р603) from 1981 continues. I replace some dried out electrolytic capacitors in the horizontal oscillator and leaking ones in the power supply. I diagnose the linear voltage regulator with discrete germanium transistors and I explain how does it work. I explore and test the internals of the high voltage multiplier with selenium diodes. I explain the horizontal output and high voltage generation circuitry. I test some problematic paper capacitors in it and I discover the most likely cause of the shorted horizontal output transistor.
Episode 1:
• Yunost R603 soviet TV ...
Episode 3:
• Yunost R603 soviet TV ...
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There's something really relaxing watching old capacitors being tested and compared to new one's...
I can suppose that Danyk is a new one in some way, but he doesn't manufacture these capacitors.
In case someone is interested, Юность/Yunost is Youth - the period between childhood and adult age.
not sure, but looks product from 80-ties.
Thank you for showing and explaining even the voltage regulation , not only the faulty section.
I love discrete components and modular build.
In these videos, taking stuff apart and testing, putting known good in, and explaining the whole time is exactly why I watch!
Specifically that foray into the supply and regulator and I am glad you took the time!
I worked on a 90s Sony some years back and couldn't work out why it kept blowing its horizontal output transistor. Now I know a lot more helped along by videos like this.
This is great... I used to find old 1960s and 1970s TVs and take them apart for components.... but I never had much understanding.... always love to hear more about TVs and how they work.
It's fascinating how such a complicated device was so widespread to the point where it's a goldmine of ideas and parts that is right under our noses!
Such an amasing video! Please do more teardown of Soviet/Russian devices!
Well, he has a soviet oscilloscope that looks badass. I’d want to see inside
Hey diode, what made you think the voltage multiplier could arc? I assume it was designed without wax/resin and the TV worked many years with it.
I find these old soviet devices really fascinating, please make more videos of them!
I remember starting electronics with germanium transistors. they do have a lower junction voltage, notorious for leakage, and suffer more from overheating (easy to damage soldering). why we switched to silicon in the 70's (I forgot to add - lower junction voltage meant that they could operate at much lower voltages. my first electronic kit had them and was able to do quite a lot with 2x 1.5v cells)
I did flashlight with joule stealer circuit on germanium transistor. Works well and discharges batteries almost to their limits
I seen a scan of old textbook and there was image about how to solder them, with pliers on legs acting as heatsink.
i love your videos back in a time i didint understood schematics than i got in to basics still it was like dificult working mazes but thanks to you i learned a lot from your tear downs and explanations
This is exactly why I watch these vids! So much good info, even for stuff you think you already know. Sometimes hearing a different perspective can seat things much better in your head!
I had a similar effect of drastically increased capacitance once. The Nichicon caps in the Vcore step down converter of a ~20 year old motherboard looked fine and tested at about 3-4 times their rated capacity (with good ESR), which I had never seen before. I double checked the results with two different meters and they matched. However the board ran only a minute or two when they bulged and vented "live" right in front of my eyes in a matter of seconds. Perhaps the electrolyte corroded the metal foils in a way that their surface area was greatly increased but at the same time the caps voltage rating also greatly decreased. That event makes me wonder if I can actually trust measurements of very old electrolytics at all.
They probably were leaky. Simple C-meters just run a rudimentary frequency test and determine the impedance, so leakage shows up as "increased capacitance". And they might have been fake Nichis.
@@westelaudio943 Even the normally good Nichicon had one or two bad series back then, which they officially recalled. They weren't fake, just badly manufactured.
I replace at least several dozen electrolytic‘s per week. Usually hundreds. I do mostly component level board repairs for industrial and manufacturing folks. With a bit of test equipment repair/metrology.
It doesn’t make sense to leakage test caps, just replace the damn things. I do test ESR quite often… But just to quickly hone in on the problem area, so for the repairs can be made. ESR in the circuit is an extremely quick way to find and diagnose issues. But proper testing procedures and replacement is a whole different story.
But in my other business, I work on vintage amps and stuff. Its The only time I ever use a Full test voltage leakage tester… Or test anything except ESR… Is when trying to maintain the originality of vintage equipment. ( which I don’t like doing)
Because in all other cases… If the capacitors are even questioned… They are replaced. Full carpet bomb replacement.
You don’t send a repaired board back to a client, to install in an x-ray machine, or process control machine in a factory… With questionable electrolytic caps. It costs a few more dollars to simply do it correctly.
And it significantly decreases further issues.
@@hullinstruments
It doesn't make much sense to recap a TV. The CRT or other nonobtainum parts could crap out at any moment. Recapping things that aren't used much, doesn't make sense especially if it's non critical e-caps anyways.
id bet you changed all old cap's no matter what their reading on an ESR meter.. am i right??
35 years ago, just after the school few of us went to special, few weeks course: "how to repair Radio and TV", of course black and white. First theory then practice. These TVs were unbelievable: the teacher was able to simulate any possible failure and we had to fix it. None of the simulated failures killed the TV. These were nice times. Also: every equipment was always coming with the full schematic - these were the nice times ;-) Everything fixable (unless you were not able to find PL504 or so). These were the nice times ;-)
Very good, and accurate diagnosis. I'm really enjoying this series. Good job.
I love watching your videos. You have a real talent and are very good with explaining complex subjects.
Nazdar! Super video, díky.
This is a nice work so far. I hope to see this TV working again. Good luck Sir!
so indeed you are learning how to wax up stuff from the chinese manufacturers
I’ve never heard this term before. Very interesting phrasing
@@hullinstruments
A few videos back DGW showed a cheap Chinese power supply that had fake capacitors. They were salvaged and dented. The dents were filled up with wax!
@@Conservator. oh yes I’m familiar with that video I’ve watched it several times, I didn’t realize that’s what he was referring to 😂😂
@@hullinstruments 🤣👍
dang I was really getting into this.. Your channel has always been above my head.. But that is how I learn and brother I have learned a lot here.. thanks..
Yay! Another video from diode! Thank you!
love to see vintage component. nice vid, as usual.
TV restoration marathon!!🙂❤️
Sweet education my man. Thanks heaps
What a cliffhanger! I guess we'll have to see in the next video if the transistor lives or dies.
28:07 she had told you but you .... 🤭 Thank you dany, again very well explained. will we see a picture on tv one day? you will make it work for sure! 📺 🍕 🍺 👍
If a capacitor is electrically leaky then it will appear to have a larger capacitance than it actually has, because most capacitance meters time how long it takes to charge the capacitor - if the capacitor is leaky then some of the charge is passing through the capacitor and not charging the plates. Thats why it is important especially with electrolytics to check for leakage as well as capacitance and low ESR. If you dont have a leakage detector, charge the capacitor and then connect a multimeter in series with it on a current range and measure the leakage current - it should be zero or very low with larger capacitors.
Why don't capacitance meters time both the discharging and charging phases? Then the leakage would be hindering the charging but helping the discharging by the same amount, so the average would be correct; and it it would be possible to estimate the leakage current, from the difference how long it took to charge vs. how long it took to discharge. Surely modern microcontrollers must be powerful enough to do this.
@@bluerizlagirl TBH I don't know, my only guess is that leakage is really only a problem with electrolytic caps, and most typical testers are slow to test them, so doubling the testing time would make the product look bad. It would be good to see it available as an option, for as you say even the most basic ATMEGA based component testers could do this.
@@IanSlothieRolfe It's a problem with pre-1960s waxed paper capacitors in old valve radios. If the DC blocking capacitor on the grid of the audio output pentode is leaky, it can pass too much current through the speaker matching transformer.
23:27 Now that people is a Breadboard that has been used for lots of practical electronic projects.
In other popular electronics channels, you will see a pristine Breadboard looking like it's been handled by a Fairy.
Back when I was younger I used to fix tv's for people. I didn't own a scope. The only 2 that really could not figure out were 2 that blew the horizontal output after a while. Replacing the transistors I had a serious screeching from the horizontal output transformer, but the picture was perfect. It always bothered me what caused this whine and the eventual fail of the output transistor. Later I moved on to digital electronics. I still think about it after 35 years what caused that strange whine noise.
Swaping germanium transitors with silicon transistors (or diodes) very seldon works my friend, as you know, each have completely different operating charictoristics, That said, you can sometimes alter the biasing on the silicon transistor so as it is close to the biased stae of the original Ge transistor, and this could work. but just swaping a Ge for an Si will hardly ever work. Maybe, if your very lucky, Si would work in simple switching circuit without modifications, but never in its linear region, their biasing conditions are just too different. Please keep up your excellent work on youtube mate, It really is one of the very best educational and entertianing sites, people could do a lot worse with thier time than listen to all of your technical knowledge and advice which you offer, all completely free of charge :-) Kind regards, Neville PS I think your cats wonderfull, if you ever get stuck just ask her for advice, I just know, for sure, she will tell you the answer, in one of those txt bubbles ;-) My cats gone now, bless her, but she was always giving me advice, the only problem was; she used to tell lies ;-)
i dont remember seeing the video before this.. it was probably far in on a playlist for the evening & i feel asleep before it came on.. im hearing that this has a multiplier, instead of a step-up transformer.. i want to go back and watch the previous video "BUT" want to see this too. "IL BE BACK"
"IM BACK" WELL WORTH GOING BACK TO WATCH THE 1ST VIDEO.. : )
OK THAT WAS AWESOME DANNY, THANK YOU!! I LOVED THE REGULATION LESSON. & the diodes in the multiplier. their like putting a load of 1N1007's in series, would they need to be able to handle 11K voltage?? (i know they would add up their current carrying capability's, but not sure if the individual voltage of 1000v would be enough for one of these kinds. i must look into this and find out the proper answer myself)
P.S. DANNY the brightness of your recent video's is up very high, just to let you know.. ; )
nice and ingeniuos gadgets for testing. Even the scissors pointer on the diagrams seems to work. May be a little more zoom would be more liking in these cluttered scenarios
I think is your chanel is very interesting, y like a SSTC videos and a learn a lot off of measurement. Thank for your work, greetings from Argentina 💪👍🧉
Thanks for teaching me ElectroniiiicssssssssSss
Edit: also you are a very niceee mannn
Fasinating as Always...
Great work. Happy to learn about old TVs. But where is the third capacitor of voltage tripler. Is CRT tube itself working as the third capacitor? Thank you.
Yes, the CRT is a capacitor. The + is the inner coating and the GND is the outer coating.
Ayyyy patreon gang :)
The ESR of large capacitors needs to be measured with a lower test frequency to get an accurate reading. That meter only uses 100kHz. The test frequency should be closer to 100Hz.
9:12 only legends can understand it
Apparently after running some simulations, the capacitance of the CRT plays a role in the proper operation of the voltage doubles.
Could you please explain a light dimmer switch and how to repair one?Thanks
Voltage regulators in which the output transistor (s) has a high gain and is switched on with a common emitter usually have stability problems, so common collector circuits are more common (gain is close to 1). Instability is associated with the extremely low operating frequency (and long delays) of power bipolar transistors.
24:20 brilliant... Idea
old soviet stuff seem to be a touch above most older electronics.. in my opinion from what iv seen, "NOT" from actually use as i never came across any but would love to find something old an soviet ere. : ) like 50's or 60's.
Could you please explain how to repair a pir sensor PCB BC-118K naming the parts.It'll be a great help for me as I amlearning elelctronics after my retirment.Thanks
Sir, could explain how rice cooker work and draw the complete schematic of it. Thanks a lot.
Nice job :)
Can you share the schematic diagram ? it will be very useful .
Great tutorial....cheers.
the multiplier cover has holes to cool down and not exceed 75 ° c, which would make the diodes ineffective.
surely it is a temperature that reaches easily, and that wax you put will melt after a few minutes of operation
I was waiting for this :)
Remember when In old days If are tv stop working we have to hit the TV 📺 soo it's starts working again. I know its because of loose solder joints.
yes, and in vacuum tube TVs it was also because of the poor contacts in the sockets. Sometimes even whiskers in tubes and the CRT shorting something, also fixed by hitting it sometimes.
Super interesting video 🙂👍
If I get it right, these the prefix «ГТ» means it is a Germanium transistor. Right?
Exactly. It means GT - germaniyevyy tranzistor.
Also they can be marked as 1T. And KT are silicone one's, they can be marked as 2T
@@maxhijacker which one's?
@@jkobain I'm talking in general, for example there are KT808 "powerful" npn transistors used in audio amps and they can be marked as 2T808, and 2T usually have better durability because they were made for military purposes and quality control was much more strict
I have same tv with bad ht transformer.. Where to find these things or rather what are specification of that transformer (output voltages). It also had bad gt906a so i replaced it (choke was overheating when powered) changed all necessary caps but didnt touched power supply caps (im powering it from 12v)
Super film. Where part 3? 🙂
5:55 It's the polyurethane foam rubber that has disintegrated. polyurethane -- green technology!
Bro. You are good.
Amaziiiiiiiiinggggggg....
Valved TVs are probably easier to work on, because valves don't usually short out because of a fault in the circuit.
I will recomend replace in 37:20 right side capacitor use some film capacitor 630V 0,47uF. All electrolytic capacitors type K50-6 recomend replace too.
That voltage regulator circuit using 4 transistors is much more complicated than it needs to be. Just a simple 1 transistor-zener regulator would've been fine.
I was about to say that the simpler regulator would have worse load regulation, but oh well...
Is this another youtube automatic voice-over? The lower phrasing at the end of every sentence sounds computer generated. I apologize if I'm wrong.
Nope, just a Czech accent 😁
@@retropcs88That's not a Czech accent. That's an alien accent...😂
The transistor murder case is still open.
I have also noticed the lack of DC restoration of many black and white TVs. I would like to investigate adding this functionality to TVs originally built without it.
AC coupling was used to keep the beam current almost constant for a given brightness setting. If you maintain black levels (DC coupled video) then as the brightness of the scene increases the beam current increases, the EHT falls (high output resistance) and the picture expands (electrons travelling more slowly are deflected further). If the brightness of the scene falls then the beam current falls, the EHT rises and the picture shrinks. You can end up having to have lots of overscan so the picture is never narrower than the visible screen edges.
My first job was designing timebases on B/W portable TVs in UK. Fortunately we used silicon transistors. Still had a high resistance selenium stick rectifier (just one, no tripler) for the EHT.
@@davidashworth643 I thought AC coupling was just used to reduce costs. I have an old tube TV with DC restoration and picture expansion is minimal except for very bright scenes. Since the energy in the resonant circuit is massive compared to the beam power the peak voltage at the flyback theoretically shouldn't change much. I guess more expansion would be from winding resistance and rectifier drop. Do high voltage tube rectifiers have lower impedances than comparable selenium stacks?
@@davidashworth643 this was a helpful comment. I have a b&w tv which does exactly what you describe, to a very annoying degree. It's toasted the EHT rectifier several times because of it. It's a solid state set from the 1970s so maybe I should check if there's DC coupling going on.
Pekné video.
Nice video , but the new capacitors in the old enclosure can't dissipate more heat you can make some holes to let the air circulate or chose a high temperature rated capacitor.
Its not a problem, they dont heat up.
There are number of soviet types of details that were unreliable from the factory
among them
k10-7 ceramic capacitors
k50-6, k50-16 electrolytic capacitors
kt502, kt807 transistors
those should always be tested and replaced if possible
other than that the old ussr electronics is pretty reliable overall.
Nice.
Nice 👍🏻👍🏻 🇮🇳 || Kuki 14|01|2022
I'm looking at the schematic thinking, how has a human being possibly designed such a complex circuit, how were transistors so well Understood at an atomic level.
Atleast smaller k50-6 electrolytes "take off" like rocket-whole can went once, when I just replaced one blown western cap with used k50-6 for "testing".
07:32 😂 what will someone think if he opens the capacitor. 😅
Check ceramic capacitors around the transistor..
Hello Diodegonewild and Your Cat
I've been following you for some time and I always find your videos very interesting. Among other things, I find that You are also the nicest of the electronics that I follow on youtube, which is no small feat! Your English to me who speaks Italian seems a bit Indian, but in reality I discover that you are Russian and to think that the Americans have always described Russians as ugly and bad! ;-)
Apart from all these bullshit that I said, I saw that you use a little box with two leds to test the loss of the capacitors and bjt, I would be happy to see how it is made. Thanks and congratulations for the channel. Kind Regards
no hes Czech
Can anyone give me the circuit diagram of the transistor and the capacitor tester ? Plzz
Danyk has his website where he has all of his stuff. (danyk.cz) You cand find various home made measuring devices under the section: Measuring and testing. I hope that helps ;-)
These Soviet hi voltage diods are selenium.
👍
👍👍
7:48 you forgot to wax and shrink wrap
I didn't know the Soviets translated those schematics after importing them from the West. 😃 J/K
Grear video. This knowledge will othereise be lost in less than a generation.
👍👍🍻
It seems that Soviet Union did not have the technology for a real high voltage horizental Transistor and they went through a lot of problem to generate that enough voltage.
In fact it wasnt true in 80s when this TV was built. They had high voltage transistors for colour TV sets, so B/W TV wasnt problem. But this TVset even produced in 80s is build on late 60s design.
Where’s part 3 man
NASA called. They are having trouble figuring out one of their circuits. Left mesg: DGW, Please Contact ASAP. Thank you.
Thanks 👍 for the post. You are way better than Shongo66's confused videos.
Nothing wrong with Shangster.
6:45 you should pop it! Those unvented ones can pop very nicely.
I know what that's like, because I bought 4 off 3rd gen Intel motherboards that all failed after 1 heat cycle - doh -.
Poor transistor, is screwed up no matter what..
Why would anyone want to repair an old Soviet TV?
test zstone m7 for one video
I'm not an English native speaker. But your sought-after accent kills me. :-6
পাত্রিয়ন😂
101 comment
ah yes, only the professionals use sizers to point at a piece of paper 9:30
LoL, he is so primitive.
I just clicked on a video of your which was made in 2017 and you sound so fucking cute, like a kid XD
@@My_Gaming_Mind true. I love his English accent.
You've lost me. What are "sizers"? What/how was he sizing things? Surely, the size of an object is fixed, so you replace with same size, or adapt smaller or larger as necessary?
@@whitesapphire5865 sizers is scissors. it's a typo.