ITT CVC20 Chassis colour TV set from 1976 repair

[@gerryeneral4609]

What a battle! And what a victory!

[@michaeldranfield7140]

Not over yet though, switch didn't fit, got to find the right one from somewhere.

[@adriansdigitalbasement]

Amazing Michael! If you hadn't figured it out by now, those purple Panasonic caps of that age always leak or "pee" down one leg. If that set is a keeper, and it looks like it will be, you'll need to change all of the purple caps. I really can't believe you found a new flyback for it!! I was convinced that would be the end for the TV.

[@michaeldranfield7140]

Use to see a lot of the red or purple leaking caps in Toshiba sets for some reason, there are quite a few on the decoder board so changing them next, the transformer was a very lucky find on the internet , sometimes I cant believe my luck !

[@herbiescruff5708]

Nice job! I worked on many of these in my first job though not had one with so many problems in one go. Change lots of LOPTs and Triplers too in one go... and that SKE diode - kept lots in stock!

[@michaeldranfield7140]

One of the problems with working on very old stuff, one fault after another.

[@herbiescruff5708]

Sadly... The only jobs that take up time are vintage audio hifi equipment that appear on the bench due to the faults they have as age related, otherwise my benches are used for flat screen or other fairly recent equipment.

[@michaeldranfield7140]

@@herbiescruff5708 problem is with flat screen sets most people just prefer to throw them away where I live .

[@dreamweaver4886]

Oh wow! This brings the memories flooding back. Thanks for this video Michael.

[@German_byte]

Great to see the Sanwa analogue meter being used to check that diode.

[@douglashoff95]

These old sets were made to be able to be repaired. I'm doing my part here in the US to rescue electronics that others would send to the landfill. I'm glad there are others that are doing the same.

[@michaeldranfield7140]

for me its the memories of my younger days they bring back .

[@walker55able]

Fantastic Repair Michael. You are brilliant at this component level problem solving and i I really enjoy watching you solve the various issues. Thank you and may you keep on restoring these old TV sets.

[@morrismckinnon6047]

I remember my parents renting TVs like this with a coin metre on the side. They were always going on the blink. We didn't buy our own TV until at least the mid 2000's because they wouldn't last more than two years or so before it needed replacing again. We must have gone through every make and model through the 80's. One year it would be Philips, the next would be an ITT or something else!

[@michaeldranfield7140]

most people rented back then , if this cost £300 new that would be a fortune to most people, then as you say poor reliability due to the heat generated , so renting also gave people peace of mind

[@michaelclutton8446]

Thanks for the long video, I really enjoyed watching you work out the different problems on the old TV

[@opapagaio15]

I remember the LED arrays on the CVC30s. I never saw just one out, I usually saw them all flashing in unison as the power supply tripped & re-started repeatedly.

[@matthewgriffin4761]

Great video, Michael. Thank you. Keep up the excellent work.

[@graemefield8983]

Great video i remember those days ,when T.V.s was worth repairing, rather than nowadays quick fix or chuck it .

[@michaeldranfield7140]

Back in its day if the set was in regular use it probley wouldn't have so many faults on it.

[@phillipyannone3195]

That was a great video. I am always amazed by your vast knowledge and navigation skills around the various circuits in so many TV’s. Thanks 😊

[@michaeldranfield7140]

Trouble it this is all stuff of the past now, you wont find anyone doing this on a flat screen set as there are no service manuals .

[@vulgivagu]

Your enthusiasm for these projects is amazing. I know nothing about electronics but I watch your videos because they are strangely so interesting. I was 30 when this set was made , my neighbour had one.

[@jonathaneastwood2927]

@@vulgivagu I was 13

[@michaeldranfield7140]

pity we cant go back to the old days, there was a time when I repaired sets like these 8 hours a day, sadly those days have long gone .

[@kavs5538]

Memories :) I remember going to the Holiday Inn in Leicester, to have training on this chassis. It was unusual for us to get training for any manufacturer, but as we had had the CVC20s in, and they had popped I was sent along. It turned out that we weren't the only ones having trouble. They were so different from previous hybrid valve sets. There was a couple of chaps there that I went to college with, in attendance too. The training was really quite good and, surprise, they even admitted to the ''teething problems''. They became a decent set, but they kept changing the chassis without us knowing. You would open a box to get it prepped for delivery and it was a different chassis on the inside. ITT also sold a 26inch around that time, I think it was the FT110. A solid state 110 degree tube and had round light up touch pads at the top for channel changing. We only sold one. It was expensive! It had an intermittent fault that kept failing every 6 weeks or so. The customer complained directly to ITT, and because we never even saw the fault, it was duly boxed up and sent back to ITT. It came back about 3 months later, after numerous calls, with a new tripler. Happy customer but peed about the time taken. Thanks for the reminisces.

[@BongbongA99]

Oh wow! Someone else remembers the FT110! As the years have rolled by, I started to think that we had the only one back in the day. 1976 ish I think. Well what do you know.

[@stephenriley971]

And ths ladies and gentleman is what's called called job satisfaction.

[@michaeldranfield7140]

Yep , so exciting when the picture appears on an old set .

[@PaulaXism]

I remember those so well.. Granada TV Rentals.. Could buy them at auction for £10 untested.. as long as you bought a minimum of 50 :D My bread and butter as a back street rental shop apprentice.

[@michaeldranfield7140]

Never bought 50 so I was paying £25 for ex rentals.

[@mervace]

Very enjoyable video. I wish I had that lopt oscilloscope test idea 45 yrs ago. Yes the frame output transistors were awkward. I recall those lines down the side could be caused by a electro cap on the supply to the rgb drive transistors. Something like 4.7…250 volt. Thanks for sharing 😊

[@michaeldranfield7140]

I did try the video output decoupling cap to no avail that you mention , still not sorted it but there is also the possibility it could be down to the pattern line transformer .

[@telemedic5142]

Great video. Thank you. My grandad had this set. Lasted him years. Brought back great memories. It replaces his Marconi branded 1500!😊

[@video99couk]

10:07 Those Sanyo Beta video recorders were so well built, many of them still survive. Nice ones are worth good money now. VTC5150, VTC-NX100 and especially VTC-M40 are well worth fixing.

[@the_secret_raven]

Your videos are absolutely brilliant! I know bugger all about the insides of CRT TV's but can watch your videos all day. You've got so much patience and knowledge whether you're fixing TV's or cars, you're an inspiration. Thank you for yet another fantastic video 👍

[@michaeldranfield7140]

a lot of my friends think I go over the top when doing things !

[@tubeDude48]

The patients you have is amazing! Nice work! 👍

[@Synthematix]

Michael is not a doctor...

[@tubeDude48]

@@Synthematix ??? Dah!

[@manolisgledsodakis873]

He certainly looks after his patients.

[@michaeldranfield7140]

When your in this deep failure is not an option, got to find a new switch now , the one I tried didn't fit .

[@tenmillionvolts]

A great video Michael. What a journey. It's surprising to see the emission from an RCA tube. Here in NZ, we had the 20 inch ones in the Thorn 9000 chassis and they were terrible. Always weak with a red flare.

[@kendom33]

Absolute genius on lopt testing. Goodness I thought i knew a little about electronics (but no). Youre fault deduction is top drawer. I still usa a weller 😊 Thanks Michael

[@michaeldranfield7140]

going to do a video on transformer tested soon.

[@ianbishop247]

I feel your exasperation @58:04. As a former field service engineer (80's and 90's) repairing dumb VT type terminals (Cifer brand) on site where you tried to do component level repairs wherever possible, I have been in that position so many times. The joy of finding a component to be faulty (only had a Fluke multimeter to work with back then) but the despair of it's replacement not fixing the issue is one I have experienced many, many times. We did carry a stock of spare boards including power supply and video boards to complete the repair quickly but then had to fix our own boards back in our workshop in Northwich. I had a boot full of service manuals, spare boards, components and an RS Tool Case. We did get scopes at one point which made fault finding a little easier. All repairs done in client offices often with lots of folks around...very different times.

[@ainteasybeingwheezy]

Enjoyed that mate took me right back to sitting at your bench in the shop watching you at work i remember the big red soldering iron and i never had any doubt you would fix it I also remember the graveyard in the cellar that was a sight to see lol

[@michaeldranfield7140]

Wish I had kept all of those sets I threw away now .

[@andygozzo72]

seconded about servisol destroying plastic!

[@Lyndalewinder]

Brilliant TV performance given its so old - well done Michael

[@michaeldranfield7140]

Thankyou .

[@aardvarksmith6852]

I use to carry my Weller gun for just that fault with the earth tabs , still have it.

[@michaeldranfield7140]

Use to use mine for tuner bars on the Thorn 1500 tuner where Antex 18w was totally useless .

[@Zardox-The-Heretic-Slayer]

I'm a volunteer repair guy for a charity called windyways (quite close to your area) and a couple of our women do house clearances for people, I basically signed on to generate an extra stream of revenue for the charity, previously they would just have to get rid of faulty electricals but I do my absolute best to repair everything, I've certainly had some ITT stuff in my time there.

[@richardh100]

your videos making my memory work now I'm remembering some things for this TV there was preset potentiometer for sound for the current for the output transistors , and for sibilants distortion a adjustment of the quadrature detector coil and change the de-emphass cap up in value , it's amazing how its all comes back to you , but I can't remember what I had for breakfast yesterday😊 thanks again

[@michaeldranfield7140]

I'm in exactly the same boat , A friend of mine says the reason we can remember events so long ago because it coincides with the times you were most happy in life .

[@kevvywevvywoo]

Nice result, I'm glad the crt is ok, when I started work in the late 80's I seldom saw anything much older than 1980

[@andic6676]

Thorn Syclops/9000 series were filled with those diodes

[@BongbongA99]

Another enjoyable watch Michael. Many thanks for posting. I'm amazed how the focussing was still looking good after all the time that the set had been sleeping and the LOPT and tripler was changed - quite amazing! What a nice-looking set too. We had an ITT Feathertouch 110 (with the weird channel change control panel - don't try to use it if your finger is damp!). I wish I still had it - what a fantastic thing it was. It was regrettably discarded after a colour fault made everything purple and the local repair shop said it was beyond repair! It ran for years and years prior to that - just the odd burn-up of a convergence pot. Fingers crossed that you will be able to locate and fix that left side fault on your CVC20. I'll keep 'tuning in' in case of an update. What a set eh!! Kind regards.

[@1967deek]

Another very interesting video 👍

[@killcar5nbike2]

That's an era of electronics I missed out on. Worked on plenty of old stuff, often wondered what it would of been like to of worked on it back in the day.

[@manolisgledsodakis873]

It of been wonderful. I of worked on tube sets as a teenager.

[@lookoutleo]

What, no valve on the output stage? We had a 26 inch itt it was particularly transistor and valve output. Your a good man sorting that old TV. Very interesting to see it's survived and your reserecting it . :) You realy know your stuff, wish I had you as a tutor

[@JonTheComputerDoctor]

I loved these sets a nice chassis which if I remeber correctly the suffered with poor ground connections, trippler failure of course and line output transistor. I started to specialise in ITT as did a good friend of mine, cracking picture quality.

[@Synthematix]

Top video michael i always used to use ITT radios, very good sound quality

[@michaelwolak3098]

Hi as far as I can remember the thorn 9000 chassis used the ITT tripler which was always failing and due to the high demand in ordering spares to fix sets and replenish stock always left field engineers quaking in there boots as we were only allowed to carry a maximum of 2 and replaced on a one to one basis, those were the good old days

[@andygozzo72]

i was given a 'dud' similar one, 26 inch, with CVC30 chassis in the early 90s, eventually got it working and used it as our main 'front room' tv for several years, with the back missing 😲, as the original owner, a garage owner and ex tv/radio engineer, had lost it! mine had the leds fitted....he gave me many old radios and tvs over the years. i scrapped another 2 with dud tubes and kept a few parts, i have 2 of those sound modules plus focus pot and a 'possibly' good lopt, plus another one that looks like its been rewound at some point. i used to have the IF/signals unit but eventually stripped it for parts, mostly the chips.. i think i have a set of philips kt3/k30 boards 'somewhere' 😁 the CVC30 had a couple of safety issues, one being a plug n socket burnup on the convergence board fitted above the scan coils, and dry joints on the mains on off switch, official service mod instructions were to wire the bad areas directly

[@richardh100]

wow that was amazing repair Michael but well worth it the Itt's are amazing TVs the first colour tv i had Was s Itt CVC 5 , I remember the last itt i repaired can't remember the number of it but I had the dry joints on the Earth Stakes pins in the IF Tuning can causing sound on Vision , thanks again for the memories😊lucky finding a itt 😊

[@kinklesstetrode]

Well done

[@gameyspacey847]

Brilliant sets, same with the cvc30 and 40 portables. Some had ultrasonic remotes which slotted in the front.

[@johnseagram2318]

Excellent video... The technique for testing the LOPT was very useful - have just used it to confirm that the reason that my Sony KV-M1441UB is showing a B+ supply fault is a shorted LOPT.... Just need to figure out if I can get a replacement and where from.

[@glennglenn101]

Yes , the frame output transistors were very fiddly to replace.

[@andygozzo72]

blimey, amazing you were able to get a new lopt, must've been old stock, doubt still made now!! i did replace the one on my CVC30 as suspected original was bad(dont think it was, though, as there were other issues), and a local tv/radio repair shop was able to get me one, Konig branded, i had to bend up the feedback tags on it to clear the EW board in mine..

[@Lyndalewinder]

I've still got a Weller 8200D just like yours even with a twisted wire bit. I still use it from time to time - from memory its either 100 watts or 150 watts depending on the switch pressure I think. Much cheaper than your Pace soldering station too 🙂

[@paulj-ms9vz]

Wonderful!

[@hapskie]

Fantastic video, was glued to the screen for the entire 90 minutes of it. Love these vintage equipment repair video's. Now I can't wait to find out what is causing the ripple on the left side of the screen. Oh and by the way, you still are actually good at repairing TV's Mr Dranfield ;)

[@NoMoreVoxPops]

If the "ripples" are on the left side of the screen and run vertically from top to bottom consisting of an increasingly fading set of ripples to the right, you need to start with failure of passive damping components in the line output stage.

[@johnrudd9550]

Lovely sets to work on, had an ITT portable with an odd fault, sometimes refused to start up….checked all possibilities, even wrote in to Television mag asking for advice….but no joy, suspected chopper transformer…,

[@triodehexode]

The joy of these videos is it is a great detective story in miniature. Only 10 years before chassis was the KB hand wired chassis for greater reliability.includingvavdrawingbof a hand on the back panel. Then a few later it was the hybrid chassis, the only UK TV with Tint control as the big Chief in TV advert said.Was that USA marketeering ignorant of PAL?

[@stephenriddle8857]

Your patterning problem down the the left hand side of screen I seem to remember from way back, I have had this before, but can only remember it as a problem it as a discharge/leakage around either the focus unit, the tripler it's self, final anode connection on the tube or the actual tube base socket focus pin, sorry I can't be more exact, been so long since I ever saw one, I could be totally remembering wrong but I have seen the effect on other sets, worth a check any how.

[@nigelpearson6664]

My brother Simon liked ITT over all others. The valve version had a 17 year average crt life. The hybrid 11. years.. Lack of a soft start perhaps? He modified many to make them reliable. Never ITT. Chipping Norton's version of you Michael. Sometimes he wrote in TV magazine.

[@PhilReynoldsLondonGeek]

ITT were not bad sets generally, except for what I think was called the "Pico" chassis!

[@michaeldranfield7140]

the worst I had was the Digivision

[@audibell]

Nice

[@tsd550]

That is certainly an earlier version. The tripler was screwed directly to the metal panel. This caused ‘punch through’ of the tripler case from the high internal voltage. Later versions had a countermeasure consisting of longer screws and a plastic washer about 5mm thick on each, between the tripler and the metal panel to improve insulation.

[@saulhuertascasillas3966]

I also need to solve an striation in the left of a Samsung TV. It's something I've seen a lot on consumer sets, as a gradual jailbar solving left to right very common on Phillips sets, some sanyo and so... Curiously i found a TV with the same sanyo chassis that solves the problem, but still had striation on LEFT on many other sets. Some help would be great.

[@NoMoreVoxPops]

Michael Dranfield of [Practical] Television fame. I thought the name rang a bell! What happened to Steve Beeching too?...

[@michaeldranfield7140]

Yep, that's me, Steve Beeching is still around, I spoke to him about a year ago.

[@NoMoreVoxPops]

@michaeldranfield7140 OK, that's good. I left the business well over 20 years ago but I remembered both your names. I don't know how YT selected your channel for me but it brought back memories from the time. Anyway, thanks again.

[@michaeldranfield7140]

@@NoMoreVoxPops Nice to be remembered .

[@NoMoreVoxPops]

@@michaeldranfield7140 Yes, I enjoyed the articles from you both at the time. Anyway, thanks again.

[@gridrunnersshack6337]

Time to put the kettle on :)

[@glpilpi6209]

Great effort . Just a suggestion could the slight line scan ringing be the line linearity coil itself having a shorted turn or going out of tolerance / needing adjustment ?. I'm sure I had the fault myself years ago but I can't remember what set it was.

[@neilbaker3395]

Those diodes were used in grundig TVs

[@laurencebushby713]

should have read your note in the manual as it said d3 caused the problem on the beam current limiter , love watching the old tv,s i used to work on

[@andygozzo72]

that bad switch may not be leaking due to carbon but by liquid corrosive muck that leaches out of the plastic its made of, i've seen it in those and those black plastic enclosed preset resistors, usually Piher branded, you often find white 'fur' covering them and sometimes green corrosion on the terminals , that possible replacement you found looks same as used in a sanyo portable i had,

[@DrWatts-bi1jv]

Wasn't there a remote control version where the remote control was actually the control panel off the front ? You pulled the whole remite out of the front of the TV and it had a funny battery in there ? (I seem to remember it had a socket on the back of the remote and was powered from the set when it was pushed into the front of the telly?)

[@michaeldranfield7140]

Yes there was and it had an orange and a red button on the remote amongst others, not sure it it didn't use a strange battery 9 volts like grundig sets used.

[@michaelwaite6725]

​. Would be a 7k67 battery in the remotes

[@jonathaneastwood2927]

Used a pp3 type​@@michaeldranfield7140

[@DrWatts-bi1jv]

I remember that it was a flat, rectangle thing with a corner cut off... I think. As an apprentice in Luton in the early 90s, I repaired several of these. They were old then but I never saw one with a duff tube 👍 Lots of triplers, a few LOPT's etc. Great days. Thankyou Michael, for making me feel young again! The Doric Mk4 was a very common set in the Luton area too. Same triplet as the Grundig CUC70's etc. loved that video too. How about a lovely G11, Michael, they were my absolute fave ❤

[@crr8297]

Thank you, I enjoy watching your videos. I'm in North America and worked on TV and electronics since I was a kid like you, I find it interesting the difference in terminology, we don't say dry joint, we say cold solder joint, we say things like high voltage, B plus, horizontal and vertical deflection. We never had sets with exposed fronts of CRTs either, they always had a trim ring around the CRT, in the years before bonded safety glass we had another glass in front of the CRT, what did the front of your TVs look like in the days before safety glass ?

[@jonathaneastwood2927]

We had an extra protective layer of laminated glass or perspex type in front of the crt also

[@kevvywevvywoo]

bonded safety glass was not really a thing in the uk in the colour era, we had single panel toughened faceplates with a safety rimband by the time colour came to the UK. There were a few tvs with decorative plastic surrounds like the US but push-through was standard. Many B&W tvs before the 1960s had safety glass or acrylic or sometimes a rubber cover directly applied. Dont forget that the uk only got colour in 1967 so technology was already advanced compared to the color introduction in the US which already had 10 years.

[@andygozzo72]

its very bad where they put the frame out transistors in that one, in the CVC30 theyre on a heatsink other side, very easy to get at!

[@andygozzo72]

one thing about those spring fuse resistors, i'd think you'd have to use proper leaded solder, not modern lead free as lead free has higher melting point....

[@RWL2012]

the sound is a bit crackly and splattery?

[@Disillusioned_one]

Sunday night yaaa

[@heifferman9021]

I don't suppose you have an ITT CVC5?

[@michaeldranfield7140]

Sorry no, not at the moment.

[@AxelWerner]

I never liked CRT. High frequency, high powered high voltage always been scary to me.

[@oldblueshirtguy]

Sometimes a fear is very valid. CRTs are incredibly dangerous if you don't know what you're doing (and often even if you do). 15000+ volts and an often live frame are not something to experiment with, which is why these videos are so interesting. I know enough to know that I don't know enough to touch stuff like this, so seeing it done by someone who does is fascinating.

[@preston963]

Pommie Junk, wouldn't last 5 seconds in OZ heat.

[@jonathaneastwood2927]

Well as Australia never even managed to have a home grown TV industry and imported everything I guess you would know😂

[@paulsi1234]

@@jonathaneastwood2927what? Of course we had a TV industry and most TV’s were locally made because of tariffs on imports.

[@jonathaneastwood2927]

@@paulsi1234 factories set up by manufacturers from outside Australia ie Pye etc

[@HughTVDX]

Always wondered why the Oz brigade are often so polite about the Brits 😂. Must be a deep seated reason....

[@preston963]

@@HughTVDX Do you want me to mention the unlimited pommie crap problems before they went to Mitsubishi G chassis in 83 here & they had there own problems because I can give you ALL of it starting with the 3504 toaster that you could cook eggs on in OZ , then the epic failure 4KA chassis this is when to Mitsubishi G chassis & it wasn't till the K chassis they became semi reliable, the Q chassis was good with a couple miner common problems....Been a tech 40+yrs in OZ.