High Hour Sony Trinitron KV1722 Repair Vintage Portable Color Television

Poor condition BAKED TV that needs a lot of love and capacitors resurrected back to working order
If you wish to donate to the insanity:
/ shango066
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[@Roland_Tr909_Swing]

Yeah it's shango time

[@BradenParker]

My dad bought one of these in like 1975-76. He was so proud of it.

[@jameswest8280]

Can't blame him.

[@djsherz]

This channel has taught me so much about TV repair. The main lesson I've taken away from this is that if someone asks you to repair their Trinitron, run away. Fast.

[@stickytapenrust6869]

20:50 - just to add to Shango’s point, the reason why you kill a Trinitron if you try and rejuvenate in the usual way is because the tungsten for the cathode is so thin that the spike in current from a rejuvenator will easily destroy it! There is a way I know to reactivate older Trinitrons like this and that is to increase the heater voltage to about 9V, leave it like this continuously for a few days. It slowly removes a stagnant layer of crud from the cathode. How successful it is just depends on pot luck.

[@senilyDeluxe]

Does that work on Sylvania tubes as well? I have one with a 1978 26 inch color CRT that's... well it's watchable if you wait at least a minute in a completely dark room... but then again that TV has other problems, it's got H deflection bleeding into V geometry. That might be rust growing on the pots in the geometry adjustment, it changes if you do percussive maintenance. I found the set in a dump... it's rare to find such an old TV with the original remote control. One day...

[@stickytapenrust6869]

@@senilyDeluxe Not a clue. I’m from the UK, we never had Sylvania stuff here.

[@senilyDeluxe]

@@stickytapenrust6869 I'm from Germany. It's a SABA. They had a deal with Sylvania that, at one time in '74, didn't do them much good... (that tube does have good colors and is plenty sharp, but dim... I found a 17 inch B&W SABA with a Sylvania tube in the same dump once and it was a low hour set with an insanely bright picture, I shouldn't have thrown that one away... well space and parents are an issue when hoarding...)

[@andrew_koala2974]

That is how PHILIPS techs would do it - generally increase the heater voltage to 7.2v . 7.5v and leave it like that permanently

[@andrew_koala2974]

@@senilyDeluxe SABA - GRUNDIG - NORDMENDE - BLAUPUNKT TVs were sold in AUSTRALIA - and were not suited to our hotter climate - The CRTs were great in color reproduction - - followed by PHILIPS - but the DE TVs had high failure rates due to high operating temperature - and gaining a poor reputation for design quality - so people stopped buying them - A few other brands went downhill also - particularly the UK brand THORN - another nightmare - manufactured under license by AWA - People switched to RANK-ARENA - Other popular brands were - PHILIPS - KREISLER - PYE- HEALING - NATIONAL ( aka: PANASONIC) GOLDSTAR ( now LG) YAMAHA (aka HITACHI) ADMIRAL - SHARP/TOSHIBA came later I still have service manuals for many of them - soon enough when I am DEAD someone will likely send them to the garbage tip - without realizing the value - No doubt they will dump the two $7000+ dongles for FLEXISIGN sign design CAD software as the dongles appear like any other Parallel port gender changer - and the CAD software will NOT work without the DONGLE

[@andershammer9307]

I remember back when those sets were new. When you went to a store that sold Sony and RCA and Zenith and others the Sony always had purer looking colors and better corner focus. You could read the small text in the commercials.

[@johnmadow5331]

Sony was owned by Mr. Morita and he wrote a book. Sony used new technology of sweep ray gun that created better picture than other brands like Zenith, RCA and Phico. The picture tube of Sony color TV with Tritron technology color picture tube make Sony brand the best at that time. Sony also came up with small portable set that you can carry with you for vacation trips. The quality of Sony is outstanding for the one that manufactured in Japan and command very high price for parts. That why many of them got trashed.

[@KameraShy]

@@johnmadow5331 I have one of them. A couple years ago, pre-Pandemic, I saw one in Goodwill for $3.99. Powered it up in store and the picture was clear and bright. But confetti, of course. Probably anyone who tried it before figured it was broken. Snatched up immediately, took it home, connected to a converter box and the picture is gorgeous. Absolutely perfect, traditional Triniton. Sound is good too. Expect it was low hours. And don't anybody even THINK about cannabalizing this gem for parts! I will hurt you.

[@Zickcermacity]

Most CRTs, Trinis included, were run by default with a high drive(Picture/ Contrast/ White Level) setting. I learned that late in the CRT era(late 2000s), and always made a point to set the 'Contrast'/'Picture' control to its mid-point, before adjusting anything else('Brightness/ Black Level, Color, Sharpness, etc) on a brand new set. Typical default was Contrast maxxed. After turning it down, the Picture was definitely dimmer, even on a 25" or larger tube, but less glare in the brighter portions of a picture, and better black detail(dress suit texture on the evening news anchor, etc). Much more lifelike, and probably closer to what was seen on preview monitors in the station control room

[@KarenTookTheKids364]

Shango replying to the bots is hilarious 🤣 'Nice channel shango066. Me love you long time '

[@johnromansky6834]

There was a trinitron tv in the waiting room of the local car was when I was a kid . That little hallway where you could watch your car go by in the wash . It was always set to the 24 hour news station and was always on . It was still there when they closed up business when I was in my early twenties so it ran every hour that place was open for at least 10 years . This was back in the day when everyone could smoke everywhere they wanted and in a non air conditioned room.

[@sonnyfontes558]

That power supply is a buck converter topology. The oldest thing I’ve seen to use that circuit. It’s everywhere now of course

[@davidhollfelder9940]

KV is “caved”.. haha “baked BAKED” yeah man. Shango, your repair videos are outstanding. I’ve adopted many of your techniques, including getting (and using) old panel milliameters from Ham Fests.

[@felixcat4346]

I owned one of these when I lived in LA in the 70's. I watched the godfather when it was aired for the first time back then.

[@electricboyo]

Awesome resurrection! I own an example of this model which worked well the last time I used it about 10 years ago. I learned to diagnose & repair these first-generation Sony Trinitron sets during the late 1970’s. It was a challenging learning curve for me (even though by then I had earned an MSEE degree in solid-state circuit design). Sony must have employed a huge staff of really brilliant engineers at that time. Their engineering efforts were visible in the excellent picture quality provided by these sets. Reliability, on the other hand, was variable. Conventional shadow-mask color TV sets had about 1/2 as many electronic parts in them. Therefore not as many items to fail.

[@johnmadow5331]

My uncle brought the similar Sony Set brand new in Philadelphia in 1972 to watch Olympic in Munich, W. Germany it cost $319.00 plus 6% sales taxes. But it still cheaper than buying the set in Thailand in PAL AM that cost almost double!

[@ronniepirtlejr2606]

Oh, Magic Smoke is blowing out from inside, ... Interesting!🤔👍

[@Popeyes66]

Where would we be in this world without bad caps huh ?

[@TechGorilla1987]

Each time I watch one of your videos during the converter box testing, I am convinced that cutting the cord in 2011 was, indeed, a life-changing decision for our family.

[@argoneum]

William Vent's Capacitor Factory, all labelled: WILL VENT

[@jameswest8280]

I worked in electronics repair, The Sony picture quality is far superior to any other brand. I knew techs that refused to work on Sonys, once you receive the proper training, they're really easy to work on.

[@soopergoof232]

Shango, I have a 22 yr old high-hours Sony and the CRT went completely flat several years ago. There's a small value resistor (2.7 ohms IIRC) in series with the CRT heaters, located on the neck board. I shunted that resistor, which brought emission up to like new, all 3 guns. The set is in daily use, with no sign (yet) of losing emission. Dunno if your Sony has that resistor, but might be worth checking.

[@waltschannel7465]

Basically you did the equivalent of adding a brightener by eliminating that 2.7 Ohm resistor. Others have said in posting for this video that running the CRT at a slightly higher voltage will burn off crude on the cathode and/or heaters. You are confirming that. You might want to try removing the shunt to that 2.7 Ohm and see how the picture looks.

[@111000100101001]

The low ohm resistors are there to protect the filaments from high current inrush when they are cold. The filaments may blow during cold turn on if the line voltage sine wave is at one of its peaks

[@soopergoof232]

Not when the heaters are powered off the flyback.

[@Daniel_cheems]

Nice resurrection! That TV is almost 50 years old. Sony did some impressive stuff back in the day.

[@Suddenlyits1960]

I remember the old 70’s television commercial for the Sony Trinitron portable that had Groucho Marx as the pitchman. A couple years ago I saw a very early Sony film on KZbin advertising their “trinitron” system. In that film they pronounced “trinitron” so it sounded like “try nigh- tron”,but in later ones is pronounced like Shango says it here,which is always the way I’ve heard it pronounced.

[@frankbagbey8372]

I just recently sold my kv 1722, which I bought new. Picture was not filled out all the way, but it still had good color. It was a great television.

[@wackyworldofwindios3476]

good morning.

[@MVVblog]

Yep.... wonderful!

[@andershammer9307]

Remember to use remove shorts and not rejuvenate on a Sony crt.

[@hardcorecommandreloaded3905]

I had one of those beauty's way back when I was in my 20s :) I love your videos Shango!!!... Keep teaching us about the magic of crusty electro nasty relics and all those low hour technotronic virgins!!!...

[@hestheMaster]

The mainboard always has charged up ready to go electrolytic caps , well at least the ones that didn't fry out already. Seen potatoes less baked coming out of the oven. Getting any kind of picture, smeared or otherwise, is a win. Stay for the audio repair. More bad caps. Very good ressurection by Shango but you would have to watch it in a dark room.

[@radiotvphononut]

On the subject of weak Sony CRTs, I recall a circa 1980 19" set where the green gun tested like new, but the B and R were totally dead and would not respond to rejuvenation. I've rejuvenated a few Sony tubes with a B&K 480, but they were already beyond usability and I had nothing to lose. If they took at all, they usually looked good for a few days, and then they'd fall back down and look worse than they did to begin with.

[@KameraShy]

radiotvphononut: Good to see you are still around. Your vids haven't popped in my YT feeds in a long time.

[@dorothydale4683]

genius absolutely genius. another masterpiece

[@blitzroehre1807]

Good going as usual Mr Shango. The learning curve has borne fruits I see, everytime mandatory check of the U-bolts of the line output trans👍

[@justsumguy2u]

As I posted a video on, always replace obviously blown-up components before power up---nothing is going to work like it's supposed to when stuff is blown up and open/shorted

[@chetpomeroy1399]

The CRT in that Trinitron is FUBAR! Of course, in the days of analog TV, especially in the mid-1970's, one appreciated having a color TV in *any* usable condition, as I personally recall. They were *considerably* more expensive than black-and-white sets.

[@KameraShy]

Sony Triniton's were in a class by themselves. I was there, back then, and it was true.

[@chetpomeroy1399]

@@KameraShy Yes, they were real gems; the _creme de la creme._

[@UHF43]

Puketastic and smeartastic at the same time. What a treat!

[@randyab9go188]

This set looks like it could have used the madman Muntz treatment. If you have that many completely open capacitors and the set is still functioning the parts count could have possibly been reduced. This is a true event. Where I work a piece of biomedical equipment that was made by a Japanese firm had a very strange roundabout way of achieving a result in a circuit. The manufacturer is rep was asked why they didn't do it another way which was cheaper more reliable and achieved the same result. We were told that this circuit was the baby of a senior engineer who had been with the company for a very long time. No one would overrule him on this design. Sometimes I think Sony sets were the same way. Extremely complex circuit to get to a simple result which could have been done more conventionally. The weird SCR fly back design is an example.

[@KameraShy]

I understand completely. Back in the day I worked for a (now nameless) major electronics manufacturing corporation. Politics overruled everything: engineering, business feasibility and common sense.

[@agems56]

We still have a KV-2765R Trinitron 28 inch that we bought used in 1999, that worked flawlessly for about 5 years when the green colour just dropped away and still works today otherwise in red and blue only, but still a perfectly bright sharp picture! Then the friendly neighborhood tv repair shops disappeared, so we could never find a place that could still repair it! It is a solid state set! Any ideas? Anybody?

[@leediffusion]

enjoy your videos so much even though I've not worked on tube tv's for nearly 30 years!

[@volvo09]

Reminds me of my first side of the road color TV... Brought it home somehow and it was smeartastic. Practically had to watch it in b&w.

[@TechneMoira]

I've been looking for these trinitrons for ages where I live, but none ever seem to pop up on websites. You're lucky to have found one, even "baked". The colour Sony's had a great picture back in the day. Nice diagnosing and repair. Maybe some day I'll be lucky to find one myself

[@shawnstthomas4811]

I have two of these. Both work. This was also my childhood TV my step-dad had when my mom remarried.

[@thornmountain8129]

Sony Trinitron KV1722 "Gamer's Choice".

[@tomtke7351]

You are simply REMARKABLE! And many of your followers too!

[@danilorainone406]

4th of july EOL and fireworks ceremony,whahoppen?

[@callenmeyers]

Baked, baaaaaked 😂 this was a great watch as always, I actually thought this set was in rather decent condition cosmetically besides needing a little clean up and from what I see a UHF knob 📺

[@connorm955]

I had a 1989 LXI 564.42955950 that was bleeding/smearing too but only through one of the 3 AV inputs, it had an RCA 68AEG20X02 that was kind of soft, but the brightness was fine.

[@RPike-bq3xm]

Sony had that similar switching PS for the higher end TA-F6B audio amps. I guess for a smaller Transformer foot print? Also I noticed the solder connections. I've seen that on other boards of that era. The solder pads gas out some sort of material combination when heated, bubbling the solder connection.

[@norcal715]

The KV-1722 had several different chassis versions. Each one was wildly different from the other. Worked on many of those in the early 80's

[@sanderhollestelle5801]

This set is really baked, till the end.

[@randymoyer5351]

Another Gamer special here!!

[@tectalabyss]

Hi Shango0. Great to see it working again. Liked,shared. All my best.

[@mikefinn2101]

Thanks for a great afternoon watching your trouble shooting. It helps me a lot. Love the humor you bring to your videos. really appreciate all you do

[@dreamingone615]

Capacitor voltage rating is just how much the capacitor is rated for handling before it blows. The difference between 10μf 25v and 10μf 500v is just more insulation. More is better, you can get ridiculous for the work load required though. You can increase the capacitance value by too much and have a negative effect, depending on circuit. More is not always better in this case, but less than 70% of recommended value is bad.

[@user-uk7uu9us1w]

If it's not being adopted I would love to see what happens if you rejuvenate the crt

[@godfreypoon5148]

8:18 flavour country!

[@frankowalker4662]

It's a shame the CRT is so worn, it would be a nice TV. (after a TOTAL re-cap)

[@shawnstthomas4811]

Great job BTW. You have the patience i used to have before wife and kids.... This gives me a premise of where I need to start on both of my KV-1722s. One has the surging regulation pattern yours shows as well, the other had a hellbof an audio buzz/hum. Sounds 60 cycle so I'm sure the regulation circuit needs recap. Those caps look nasty.. Both had nasty pincushion distortion. I haven't recapped either, however I did disable the instant on circuit.

[@user-gc6ow7ys2s]

I keep learning

[@xminusone1]

At the time, sony tv costed twice as more of any others brands. When you repaired one, you understand why. Twice as mutch of boards and parts. That's why they were so heavy and costly. Great quality of parts and many customs parts too.

[@KameraShy]

Was worth it. Had one back n the 70's. Weighed a ton. With I still had it.

[@josehugobarrerasanchez4396]

Excelente reparacion Jordan, lastima que el CINESCOPIO ya esta un poco bajo de EMISION de ELECTRONES en los catodos ROJO y VERDE 👏👏👍🤔🤔

[@tmmtmm]

The two 10uF 50V polar caps back to back will give you abipolar 5uF 50V since the reverse voltage rating of a polar caps is basically 0V. Technically they can tolerate about -1.5V, above which they become a sort of electrolytic diode and the other cap connected with the correct polarity will drop all the voltage :)

[@blitzroehre1807]

Two 10uf caps back to back give you about 9uf as a bipolar cap

[@vancouverman4313]

@@blitzroehre1807 I just took two new 10uF, 50 volt electrolytics out of the package and tied the positive leads together. They measured what I expected, 5uF.

[@blitzroehre1807]

@@vancouverman4313 Its because you are measuring them below the reverse breakdown voltage of the wrongly polarised cap with your multimeter. If you do a dynamic measurement with a function generator and an oscilloscope you will find its about 9/10th of the capacitance of a single cap. Trust me

[@Seiskid]

Identical caps in series halve the capacitance. Simple textbook theory.

[@blitzroehre1807]

@@Seiskid Yes, but not if they are wired back to back, because on each half wave of the ac going through one of them basically becomes a short. The correctly polarised one cannot suddenly have half the value, can it? Remember, we are talking about ac going through them.

[@Xplasma1]

I remember seeing a new TV on a Walmart display shelf that had severe red color bleeding. This was towards the end of the CRT era (Maybe 2007ish)

[@Rev22-21]

Smeartastic indeed.

[@tomfranco4866]

I'm not a big vintage Sony TV person but I kind of like that set

[@doogie812]

It would be interesting to use your CRT tester as the heater supply and see how much increased filament voltage would improve the picture.

[@electricboyo]

Red bleed due to saturation of the red cathode was a common issue with 1970’s era Trinitrons. My recollection is Sony’s red phosphor wasn’t as efficient. Therefore the color red required nearly 2x the cathode current of green or blue. Still, low CRT emission rarely occurred before about 5 years of heavy use. Also, after 20+ years of storage it seems typical for a Trinitron CRT to require about 10 hours of power-on time to fully “wake up” and get up to a reasonable level of cathode emission.

[@andrew_koala2974]

electricboyo Power ON not on ON and on have different meaning and are used in a different context. The lesser and dumbed down population today do not know the difference. much like they have been programmed to be ZOMBIES and fail to pay attention to detail. ON / OFF is relating to SWITCHING - On / Off (in lower case) is used in a context such as: I start work on Monday and I am off in the week-end You WILL often see ON OFF written on switches ( not on / off) But how can ZOMBIES learn when they L00K at SONY but see Sony. Are you all blind ? The answer is YES ZOMBIES are BLIND

[@Jimmyhaflinger]

i was once able to restore a friend's 90s trinitron with a stone dead red gun by zapping it with 8000v from an an electric fence charger, it worked and the set had a decent picture, no one knows how long it would have lasted as a few months later it was destroyed in a flood

[@briangoldberg4439]

That's good info about not trying to rejuvenate Trinitrons. Does that also apply to the "clear shorts" function of tube service devices? I've had junk on cathodes in a Trinitron and it luckily burned up safely on it's own, but I understand that that can sometimes take out the tube when it happens, and it's safer to use a device to clear shorts or clean them.

[@dree6212]

I see a lot of dry solder joints on the circuit board. 73 from PE1PPE

[@ronaldspencer547]

Baked.....Baaaaked......Bbbbaaaaakkkkkkeeeedd!!

[@tokyogentleman]

nice job! lot's of 70s caps

[@1990lumina]

good morning all!

[@rolandkeith5322]

Is that picture a convergence issue or bleeding and how do you tell the difference?

[@tocsa120ls]

8:53 that's called the "owie test". Touch 'em, go "ow"!

[@markmarkofkane8167]

Thank you for another entertaining video!

[@rmac3776]

I would love to adopt that set just do not see them any more!

[@krz8888888]

Wow they really skimped on the lead in this one

[@1marcelfilms]

i kick myself in the ass for not having bought a trinitron similar to this one i saw in the thrift store years ago

[@darkwinter6028]

Yeah, those caps have definitely rotated their last tweebulation…

[@The_Wayfaring_Smuggler]

Awesome, a repair guide on the exact model I have and was having a problem with. The color suddenly blinked out and now the picture is in black & white, do you have an idea of what the problem could be? I would be incredibly grateful.

[@Theoobovril]

A greedy pig set when it came to capacitors, Shango, I''m surprised the TV is not suffering from indigestion, keep the Enos' handy...

[@Thomas-yr9ln]

It doesn't necessarily have a lot of hours clocked on it from watching it. My grandma used to keep one going 24/7 to chase away the loneliness.

[@agems56]

Thomas Aw that's so sad, but then where were you?

[@JasonHalversonjaydog]

so that color bleed is bad capacitors? back in the 90's we had an older TV that was dong that. we eventually replaced it but interesting to know what probably was causing it

[@krz8888888]

You don't call them triniturds anymore, that's a huge endorsement

[@TheDevice9]

16:40 I'm confused..... How does tying the negatives together on polarized caps make them bi-polar? Is that different from non-polarized? I love your videos. Thank you very much for posting these. I have an early 70s Trinitron KV-1203 that used to work fine 20 years ago when I stopped using it. I don't know whether it's safe to just power it up or not now. I can fix old radios but TV's are perhaps beyond my ability I think. I may have to just sell it someday instead, but I'm really curious if it would still just work. Thanks again for the best electronics show on the interwebs.

[@MattExzy]

My dumb dumb noob thinking is that bipolar caps might be for an AC source, or maybe signal that isn't polarized and so a traditional capacitor might 'influence' that signal by chopping it in half. I'm thinking just by using the positive leads with negative in series, the signal might be 'positive' at least half of its cycle. Something like that.... not sure. Again, noob thinking.

[@KameraShy]

Shango has some 'splainin' to do. As for your TV, probably follow his advice, open up the back and check it out. Look for the broken u-bolt on the flyback transformer. Look for leaking caps. Anything else that looks wrong. If you have the equipment, test caps and resistors. I fired one up and got lucky. I figured it had already bee powered up, so nothing to lose. I got lucky. (Rare occurence for me, BTW.)

[@Pentium100MHz]

Connecting two identical polarized caps back to back is an accepted way to make a bi-polar cap. You get half of the capacitance and the same voltage rating as a single cap. Basically it works like this. Let's say you have two caps connected +C1--C2+, C1 is charged to the rated voltage and C2 is at zero. If you now reverse the voltage (so that positive from the power supply is on the right), C1 discharges and C2 charges up. The one edge case is if both capacitors are discharged, then, when you connect the power supply, one capacitor will be reverse biased and act like a diode, but only for a short time (until the other charges), apparently this does not hurt the cap.

[@TheDevice9]

@@Pentium100MHz Thanks very much for that. I'd never heard of this and wanted to understand how it worked.

[@zx8401ztv]

Not bad for a baked set. Pity the c.r.t is knackered.

[@attilarivera]

I'd love to put my hands on that tv. Just to clean up and let it shining just like brand new! 👏👏👏👏👏👏 💚💛💙🇧🇷🇧🇷🇧🇷

[@CATech1138]

Turn it up and it looks like a WIRED magazine cover

[@drsysop]

I doubt commercials are copyrighted lol -Cheers!

[@minilab9030]

Of course I had to check...just had to see whether or not I had a 4.7uF 350v radial....(didn't have one either...closest was a 4.7uF 50v....which would have been completely useless here.

[@mortwin6054]

Good vid as all ways thanks all so go my self a cheap radio a national Panasonic RF 516 of eBay that don't work and i am going to see if i can fix it even got the service manual took sum looking LOL

[@suadcokljat1045]

You can't loose with twenty twos. Top! :-)

[@aerotro]

Yeah those 1uf caps never seem to have a long shelf life low tolerance to ageing.

[@russellhltn1396]

Curious what the other capacitor was for the sound. I'd expect an open feedback capacitor would make it loud and distorted. (However, a leaking cap could mess with the bias.) A bad coupling capacitor would make it weak.

[@Masterkill45588]

I've fixed some video game monitors and it always seems like red is the first color to go real weak on a tired crt

[@myspringitguy3226]

Shango what's your favorite brand of vintage TV to work on?

[@simonstergaard]

totally usable if you just shut the thing off... (reds not included)

[@worroSfOretsevraH]

Anything you can do on some new CRT TV's that have a single chip for everything which have the "bad regulation" as you've told problem? When the picture contains some white areas, it bends in horizontal direction. With alternating black and white background, it shrinks and enlarges like crazy. Voltages are fine, capacitors are fine. Is this how these cheap TV's behave? (LG Golden Eye 2 - lg_mc-019a chassis for example)

[@krz8888888]

That's fantastic condition

[@akshonclip]

Flea hatching @33:00

[@slaznum1]

Magic smoke!

[@Mrshoujo]

Gamers Choice at a convention.