All You Need To Know About CRT TV To Fix Stuff
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- Опубликовано: 2 авг 2024
- Let's have a look at retro CRT Television - learn how they work, what goes wrong, and how to fix them.
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Richard
As I was watching this, my whole life as a C&G RTV engineer apprentice came flooding back. I recalled how I started work as a field service TV engineer working on dual standard 405/625 monochrome TV's with turret tuners that just needed a clean. I lived through the days of progression from valve tech to descrete component semiconductors. Happy days. I recall my first installation of a Bush Colour TV that was size of a large front room cabinet that needed a full installation to setup the RGB convergence by twiddling the many many internal knobs to converge the Red Green Blue scans for the upper/lower/each corner/ centre etc etc. I really enjoyed the days of component repairs onsite in clients homes, but when companies started to push for 'panel swap out' instead of proper full onsite repairs the fun stopped, and so did I. The neewbies wouldnt believe what was needed to get a viewable picture in those early days of colour TV . . . . . and nowadays you can just pulled a massive inches screen out of a box and bung it on the wall and away you go. After 19 years in the Television and VCR repair game I stayed in the electronics but moved over to industrial control system such a CANbus etc and there I stayed for 30 years ending up training the new generation. I retired last year, it was and still is, a good life.
This is hands down one of the best videos on youtube about how a CRT works. No flashy graphics, bite-size content, attention-getting cutaways. Just some good old honest teaching on graph paper. Thank you, sir for the service that you have provided society.
More CRT TVs, please! We, and by "we", I mean "me" definitely want more. Thanks, as always.
I second this motion
I just love to see electronic repairs ,it doesn't matter if it's vintage, it's learning the art of electronic repairs, developing the mindset that you teach very well and your explanation of how the TV works was very well simplified and made easy to understand. I say go-ahead with any vintage equipment, at the end of the day it's electronics yeah.
. Even though I've been doing Electronic repairs myself for many years I still look at other technicians techniques that may be better than mine, always learning and developing new techniques and that's what I love about electronics you never stop learning.Excellent video.
Yeah, it's all electronics at the end of the day! Clearly you have been watching me for a while 😂
From boolean on off electrical signal to a picture on a screen made by an electrical pulse in phosphorus, described start to finish in 40 minutes? Yeah, I'd say this was a pretty damn good lecture.
would really like more CRT content. A fine grain look at each component in the cycle would be really helpful to tie everything together. Would also like to know what each wire to the cathode does and if there's color standards etc. Really great work!
VL/VH is probably for selecting the VHF band for the TV Tuner. VHF-Low/VHF-High.
The Low-VHF band usually covers channels 2-6 and the High-VHF band covers channels 7-13.
Hi Richard. Most, if not all main parts of this TV set is manufactured by Matsushita (today Panasonic), easily identified by the triangle logo. They were one of the most popular manufacturers of portable (and stationary) TV and audio equipment in the '70-'80-'90 era. This TV set is most likely a rebadged one. I would start by searching for the model number on the boards to try and find a similar Panasonic/National model, which may have the user manual and/or service manual available.
Thanks for the info. Actually in the 70s and early 80s UK, Matsushita (or Panasonic) were not common names in TV sets, we had a lot of Thorn, Bush, Ferguson, Pye, Decca, Philips and other brands I don't recall right now. Probably the most common 'japanese' one we saw was Sony Trinitron
More crt repairs please!! Thank you so much, best overview explaing ever.
this is an incredible tutorial and explanation, i hope that newer generation like me will involve themself to repair crt tv's
Amazing Video 😊👍👏
In German the first Anode called umbrella grid (Schirm- Gitter) ☂️🥅
Fantastic video! Thank you! More CRT repair content, please :)
Very well done, an excellent explanation of how an analogue TV system works. I spent nearly 40 years as a transmitter engineer working at the top of mountains on TV transmitter maintenance and repair. I also spent many years repairing TV sets so I appreciate your enthusiasm. Digital TV is of course , a very different proposition! You have composed an excellent lecture! Glad to say I am now very happily retired as it was always fairly hard work, against the clock, otherwise known as an impatient viewer, and seldom near to home.
This is one of the best videos on this topic that I've come across - many thanks.
Well done Rich
Another great video, I like stuff like this because you teach so well, very patiently.
Well done mate 👍👍
Yes please! More of this 😁
Great video thanks for taking the time to share your knowledge.
He is the most intelligent yeti I've ever seen. Very impressive.
I find all your videos are very informative and a pleasure to watch from beginning to end. From a complete beginner perspective your content is very much appreciated. Your knowledge of electronics and experience within this field and your very approach not only explains the very nature and function of each device or systems that they are employed in but also the dangers inherent in working on them. The result of which I view all of your content with great pleasure respect and gratitude. I am sure others will enjoy and appreciate your videos just as much and would love for you to cover older technology ie Vacuum tube gear as a lot of interest relates to vintage equipment that is often collectible as well as needing repair. Keep up the great work and thanks again Mark!
Awesome video! Lot of info on how these work! Definitely useful for a better overall understanding on how all of these components come together to form the function they're designed to do!
Great vid, will help me in my Vectrex repair. One thing you didn't cover though 'How not to die, things not to touch'. Have a good one.
Excellent video Richard, with an excellent explanation on how it works. Just the way I remember it.
was waiting for this long time!
Yes, love the variety of products. I remember working on one of these, or a very similar model in the 70s. Sanyo, I think. I'm sure I'm not alone in expressing an interest in domestic electronics using discrete components, before the the microprossor era. Thanks for a great contribution.
Thank you for this excellent explanation on how a CRT TV works. These general explanations of a generic device are the main draw for me to this channel, since you are an excellent teacher with a nice voice. When it comes to repairs, I'm mainly interested in more modern electronics, since almost no one brings in this kind of tech into the Repair Cafe where I work at as a volunteer. So the second reason for watching your repair videos would be following along with more or less contemporary device repairs.
Our first TV was a 12 inch black and white one which was duel voltage, mains and 12v dc. We took it on holiday to my grans static Pemberton caravan, with gas lighting and solid fuel stove. It was always freezing as we had sleeping bags from Goldberg catalogue and were paper thin. The 1970s.
congradulations on getting the set working.
CYCOPS was used by thorn in the 9000 series of colour set but glad to say they saw sence and reverted back to seperate smps.
on most colour tubes both delta and inline each gun had its own A! so that the background could be adjusted for each colour
a lot of colour sets used cathode modulation and kept the grid at a constant voltage some times haveing the blanking pulse added.
all in all i think you did an excellent job of describing the basics well done i wish i was as good at discribing complex stuff.
Brilliant that Richard! You managed to explain how a CRT works on an A3 piece of paper.
On the page of marcelstvmuseum a similar tv can be found "supertech 6 inch color tv monitor"
Great Video, great description of TV workings, learnt a lot - thank you.
Excellent video, so well explained as normal. Would love to see some valve amplifiers or radios stuff.
Excellent explanation on how the lines and frames are generated. I learnt a lot ,thank you. I would love to see a future video of the various signals demonstrated on an oscilloscope. Can you elaborate on how the audio, video and sync information is separated in the tuner and diverted to the appropriate circuit.
Awesome video! Thanks for sharing your knowledge. I certainly learned something and will take the knowledge with me as I start to repair my vintage sony portable crt tv.
One of you best Richard and very much appreciated. If you do some tube work, please wear a retro TV mans repair jacket (complete with pens in the brest pocket) and some stick on sideburns. It will have that real retro feeling.
Very cool to watch the repairs!
Great video, I learnt loads from this. Thank you
Superb video, thank you. Would live to see something similar for AM/FM radio. Including testing the various IF stages with signal injection and tracing.
I studied C&G 224 in 1994 and fell about laughing when they spoke about a fault they called a Blank Raster. I've met quite a few before and since then, but they've never been on TV lol 🤣😂🤣😂
Excellent video. I like how you explain things.
Wow, that takes me back to doing my C&G 224 courses. Only did it as a hobby and IIRC the most common issue I found was Switch Mode Power supplys going bang!
That's probably because I took my C&G 224 in the early 80s. It was a 12 month full time course, I came out top of the class (fact) with three distinctions and an average of 99% on course work. I nver did TV repair as a job, only as a way to make money on the side. I finished my C&G on a Friday and started work at ICL in the central repair workshop (component level) on the Monday. Together with an HNC (2 year part time paid for by ICL) in 'Microprocessor system design and programming' which I also got three distinctions, I don't have any other qualifications other than three A levels Physics/Chemistry/Biology
@@LearnElectronicsRepair One evening a week 95-97 Mix of distinctions and credits. Part 3 was Digital Techniques, Micro and computing systems and Colour TV. Was my third run through the further education system. Already had a C&G full tec with endorsments and a BEC in microcomputing.
I’ve been waiting for you to do a CRT!
Clearest explanation I have ever seen. Straight to the point. Thanks.
our TV tube is starting to make that "I'm soon to part this world" sound and guess it's time to fix her. What is the chance theres a spare new tube around .... lol.
Excellent video. I wouldn't mind seeing a video using a scope around various parts of the driver board and what the signals should look like for the different sections like horizontal drive vertical drive and deflection section.
You are the best👌
Great description of how a crt works. Thanks!
I have a blackwhite crt where the top left corner is lower (about 3cm) but the picture is otherwise good. This is on a computer crt from 1988.
Awesome...
I still have a similar mini TV that my sister bought me for my birthday back in the 70s, but it is only black and white. I believe that it may be a Quasar. I also have one that is a TV/radio/cassette recorder/player combo that I found in the trash many years ago. The TV screen on it is rather tiny! I remember doing some repairs on it when I found it and got it working. I wonder if it still works now?
Got to maybe check it out.....if I can find it.......🤔
I would definitely be interested to see more repair videos on vintage equipment, Richard. Love it ALL both old and newer! 👍👍
I’m interested in watching you fix whatever you find, including vintage tube and solid state. As with this, being I’m from the USA, this was the first time to see PAL TV explained.
And I didn't even get into explaining phase alternate line LOL
I do remember these kind of sets from the 80s perhaps an enquiry to Shangoo might help but from the past these sets had no documentation as they were cheap imports but pretty generic in how they work. This set would make for a good restoration video but the tube might have problems couldn't see much colour but might need the caps doing and rgb o/p transistors changing bring some life back to it. Thanks for the very good refresher in how crt tv works. Muchos gracia
Certainly if I am going to restore it then I would replace all the caps on the board with the hold adjustment etc. That one looks like it has the colour and sync and audio decoding circuit on it. It also has the RGB output. I think the poor colour decoding is more likely due to the problems with horizontal sync (line tearing) as it looks like it is syncing on the start of the video signal for each line, rather than the line sync pulses proper. If it was a CRT problem I think it would cause more of a background colour cast on the raster. I'm not sure what the smaller vertical PCB on the other side is doing as I didn't look closely at it but it could be the line oscillator/sync. Bottom board looks like Line/Frame output and power rails.
Thank you for the video, not sure if you ever got an answer but I believe this is a Sonic De Luxe 7 inch portable TV radio.
It has some value, perhaps around £100 ish.
More TV repair solid state and vacuum tube please
Thankyou Richard. I see quite a few L&G 26" screen TVs being thrown sadly.. would love to see repairs on similar maybe less weighty model approach toward precautions around 25KV maybe approach such as one ✋ to prevent shock... Note worthy subassembly identification and it's working such as standby circuit that keeps preventing turn on.. 👍
Very good! Thanks.
❤❤❤
More crt tv repairs please.
The hair on this guys hands is outstanding
❤
Heya, yes old tv repair veryyyyyyyyyyyyy intresting as I never unterstand it wen I was at midle school learning elektronic now with this explanecion it much clearer for me it can even go dieper in to detail how everything (component lvl) is working ( for exemple led's have differant volt for R,G and B) hhow is this done with analoge tv
Raster: not a guy with dreadlocks!! Hahahaha
Richard - don't know whether you ever found out any more about this TV but if you're still looking try contacting Michael Dranfield who has a youTube channel by that name covering mainly TV repair and he has been in the business for donkey's years and will doubtless be able to point you in the right direction.
I bought a last run analog TV in 2005 as TV prices for bigger tubes sold for less than $300 USD (the price I paid for a new 32 inch CRT TV in 2005). In 2007 the United States stopped broadcasting in lower bandwidth analog signals and required all TVs analog to have a digital reciever conversion box of taking high bandwidth digital signals and pulling out the necessary analog TV signals at output to a coaxial line to the input of an analog TV with cable inputs. That is, all 1980s TVs up to the last run 2005 TVs before the first LCDs and their huge prices were equally marketed. I'd like to see how to fix sompler failures in the 2005 TVs such as vertical scan missing at the top half of the line traces missing. It just seems to be a simple components failure(s) finally after 18 years. A diode problem? A transistor failure? An IC chip failure since 2005 TVs used most up to date technologies?
Nice video! Hey what about discharging high voltages when looking into one of those ? Which holds that ? I've seen maybe people unplugging what it seems to be the - - final anode? -- ??
More crt tv repairs please, very hard to find repairman fo these, and they are heavy. So the only option is diy
I just realized that the pit of anxiety in my stomach as he is drawing is from worrying about that non-moving dot causing burn-in on the hypothetical television. 🤦♂️
Hello. My CRT is starting to go Black on its corners and it's image is a little bit moved to the left. Would you have any tips on how to fix it? Thank you 👍
Hi have a leak on eht wire that attaches to the anode.Please advise the best method to seal the break in wire .i.e. what type of glue can i use.thank you
Hiya Dicky, nice video but can you explain a flyback in the older tvs
Hello. Thank you so much for the video. It's greatly appericiated as I (as a vintage tv ethuaist and a noobie repairer. This made it all so simple to me when it seemed like rocket science!) I have some questions as I am an ametur...
1. Do you need other equipment? or fault check properly? - I just have a multi meter? My impression is that you soley need a multi meter to detect voltages and replace parts that don't meet the required electrics. (Some people suggest the use of oliscopes, ear meters & high bleed resistors)
2. Are schematics really needed to detect faults properly or could I just use this video as a prime example to refer to?
3. Would it good to strip old sets for spare parts?
4. I have two sets that don't have any power. How should I go about fault checking?
Reach out to Shango ! great video...cheers.
could you do more CRT repair,also vacum tubes ones? Thanks.
Any kind of electronics repair is great, but preferably not older than say late 70s. No tube-stuff for me, except CRTs :-)
For me I like to see audio equip video tv and all kinds of repair so what ever you repair is fine with me
Back in th 70's and 80's I made a living repairing CRT television sets, stereos and VCRs. Then I went into industrial electronics. I'm retired now and haven't much of a clue about TV's now! You just discard them anyway. I fixed lots of vacuum tube sets back then.
Hey i have a problem with my Sony trinitron KV-32FX68E. I have image flickering. i looks like the pixel are jumping up and down. It is on normal TV, menue or gaming. i heard that the IC for vertical image can be not working good anymore. I have uploadet a video on my channel with that problem
Hey boss, I got a question: I have a CRT TV here that has been working great for years, but suddenly stopped getting a picture when turned on. I smacked it once and the picture popped up slightly warped. I turned it off and turned it back on but no image. What connection on the board could be loose that I should try and reseat?
How do i repair crts that have condesation on and when i turn them on they dound really bad
Does anyone know where to start when the entire horizontal position is shifted to the left? The service menu allows the picture to be shifted right but it's as far as it will go and my only solution so far has been to decrease the entire picture size. The TV also only displays out of component and not composite.
It's a Sony Trinitron from 2000 model number KV-36FS12
A up duck like these vids
Maybe... Maybe the brand is actually called "Sonoc"?
Never heard of either one, but probably a re-badge of a cheap brand, like Sansui, Sanyo or some other value brand.
Maybe the chips onboard will help?
Maybe oscilloscope crt will include to explained
☘️great stuff. 🇮🇪🇺🇦🇺🇸🇬🇧👍
VL and VH are VHF low and VHF high.
so the old trick of hitting a tv an old dying tv, possibly be to do with the heating elements ????
the Fonzie affect :happy days
As a hobbyist, I'm interested in all kinds of repair, but realistically, I'm unlikely to ever come across this kind of stuff. IMHO, most ordinary people today don't want their CRTs repaired. They want their flatscreens repaired.
Case in point: Just the other day I was asked on a forum for a recommendation for a new TV, since the old one broke. The lady wanted 3D capabilities, and I had to tell her that 3D was a fad that the industry abandoned about 6-7 years ago. "What am I supposed to do with my 3D content?", she asked. Well, the industry wants her to throw it all away and buy new HDR stuff, which is the current fad. And who knows how long that's going to last? Her only other options were to try and find new old stock, or get the old TV repaired somewhere local. That would have been business for someone.
I don't know what your agreement with that shopping center entails exactly, but maybe you could fix 1-2 car boot flat TVs/monitors not for customers, but for yourself and the channel. Just to show what can go wrong, and how to approach it. Or maybe do a collaboration with the TV guy in the center. Just a suggestion, though. Take it for what you've paid for it. I'll keep watching either way. 😉
If they are smaller screen ones i could get away with that. I'll see what I can do 🙂
Did he say didn't know difference between TV and vcr?
Auto closed caption says every now and then that it’s synchronizing poles and lies! 😅
Whaaaaat the heck
Nice to know if you are heavy into old kit, but otherwise life goes forward not backward. If only you could have made this video 40 years ago.
Agreed, but if you've got to fix some vintage industrial machine (as late as the early 2000s), CRTs are still prevalent and often difficult to update as they frequently don't use a common interface.
Fossilised chewing gum LOL best keep that might be worth something. VL / VH switches the broadcast band.
Voltage Synthesizer tuner (VS tuner)
Tuner that uses a tuning control (VT or BT) with a voltage between 0 to 33V Voltage Synthesizer tuner named. TV can be found on the aircraft models, old and new
Based on how the control band-switch, Tuner VS then there are 2 kinds, namely
Using 3-Band input sw, the VL-VH-U
Using 2-Band input sw, the Band SW1 and SW2 Band. This tuner is actually similar to the type of band 3-sw. For control-sw 2 band is in the tuner will still be converted into 3-sw bands.
Frequency Synthesizer tuner (FS tuner) or the type of PLL
Tuner wherein the tuning voltage and the voltage controlled band switching the digital communication through SDA and SCL. This tuner has a supply voltage Vcc, which is
5V is used for the digital tuner circuit control and
33V (fixed voltage or fixed) is used to control the voltage supplied to the tuning in the digital circuits within the tuner.
(Tuner old) sometimes there are additional circuit voltage of 12V to the tuner.
Frequency band.
Based on the wide range of revenue-frequency band, there are three kinds of tuner
Normal tuner
Superband tuner
Tuner hyperband
Normal tuner, the tuner that can receive broadcasts "on-air" (terrestrial) TV in the frequency band:
Frequency of VHF Band I - VL 41-68 Mhz
Band III - VH 174-230 Mhz
Frequency UHF Band IV - U 470-581 Mhz
Band V - U 582-960 Mhz
Band II 87.5 - 104 MHz is used for FM radio broadcasting
VL and VH bands used for broadcast channels 2 through 12
U bands used for broadcast channels 21 to 69
Superband Tuner and Hyperband, the tuner can receive broadcast as normal tuner plus the ability to receive broadcasts "off air" CATV (cable television).
S band using frequency band between VL and VH
H-band using a frequency band between VH and U
Superband Tuner can receive the broadcast band S
Hyperband tuner can receive broadcast band and S band H
Based on the IF frequency out
IF frequency tuner out there who have 38/38.9/45.75 Mhz frequency. In Indonesia generally use 38.9Mhz frequency, but sometimes there is a use 38.0Mhz
Based on the pin-out
There are several kinds of tuner long pin-out configuration. But now almost all the tuner is already using an international standard 11-pin
Universal tuner
More tv repair
Help with my beloved Commodore 1084s D1 monitor please.
What do you think this might be: ruclips.net/user/shortsRZBdNZa25Bs
Any suggestions welcomed.
@Mr Guru Thank you for your advice. I am aware of the high voltage inside the CRT, theoretically I know how to discharge it, but that is one of the reasons I haven't opened the monitor yet.
No liquids were dropped on the monitor, it was working fine, then suddenly the top left corner seemed to move further towards the top left of the monitor. The next time I turned it on, it was like it is showed on the video. It smelled like fried electronic components also.
Vhf high - Vhf low
Don't touch the flyback.
I only ever did that once, back in the 80s. Put my hand on the line output transistor while it was running. It hurt a lot, and unlike a mains shock where you get a deep vibration at 50/60Hz, with the line output you get a loud high frequency whistling in your ears. Definitely not recommended, stay safe guys. *As fun as it might look, please don't mess with this sort of stuff if you don't have a good amount of prior experience with mains powered PSU etc these CRT TV really can and will kill you if you don't understand what you are doing*
G7khf
Voltage Synthesizer tuner (VS tuner)
Tuner that uses a tuning control (VT or BT) with a voltage between 0 to 33V Voltage Synthesizer tuner named. TV can be found on the aircraft models, old and new
Based on how the control band-switch, Tuner VS then there are 2 kinds, namely. . . .
Using 3-Band input switch, the VL-VH-U
Using 2-Band input switch, the Band SW1 and SW2 Band. This tuner is actually similar to the type of band 3-sw. For control-switch 2 band is in the tuner will still be converted into 3-sw bands.
Frequency Synthesizer tuner (FS tuner) or the type of PLL
Tuner wherein the tuning voltage and the voltage controlled band switching the digital communication through SDA and SCL. This tuner has a supply voltage Vcc, which is 5V is used for the digital tuner circuit control and 33V (fixed voltage or fixed) is used to control the voltage supplied to the tuning in the digital circuits within the tuner. (Tuner old) sometimes there are additional circuit voltage of 12V to the tuner.
Frequency band.
Based on the wide range of revenue-frequency band, there are three kinds of tuner
Normal tuner
Super band tuner
Tuner hyper band
Normal tuner, the tuner that can receive broadcasts "on-air" (terrestrial) TV in the frequency band:
Frequency of VHF Band I - VL 41-68 MHz
Band III - VH 174-230 MHz
Frequency UHF Band IV - U 470-581 MHz
Band V - U 582-960 MHz
Band II 87.5 - 104 MHz is used for FM radio broadcasting
VL and VH bands used for broadcast channels 2 through 12.
U bands used for broadcast channels 21 to 69
Superband Tuner and Hyper band, the tuner can receive broadcast as normal tuner plus the ability to receive broadcasts "off-air" CATV (cable television).
S band using frequency band between VL and VH H-band using a frequency band between VH and U
Super band Tuner can receive the broadcast band S
Hyper band tuner can receive broadcast band and S band H
Based on the IF frequency out
IF frequency tuner out there who have 38/38.9/45.75 MHz frequency. In Indonesia generally use 38.9Mhz frequency, but sometimes there is a use 38.0 MHz
Based on the pin-out
There are several kinds of tuner long pin-out configuration. But now almost all the tuner is already using an international standard 11-pin