These little colour sets are awesome for old computers like commodore64 and zx spectrum, nice to see it has a flat tube too! thats an excellent solid colour picture, i love these old colour sets
Cute TV! Something like a NES or SNES Mini would look quite wonderful hooked up to it. Excellent fault finding - I would never have suspected that spark gap thingy! Naturally, given the size, the first instinct would be to look for signs of drop damage (and the inevitable cracking of the mainboard), as was so often the case..at least in the ones I always seemed to get lumbered with! And I was never lucky enough to come across a colour one! I would've loved to have owned a set like this back in the early nineties. Instead, I had a Citizen brand pocket TV which was positively microscopic in comparison!
I've got mine on the bench now, here in the UK, this is the Samsung PAL version, no spark gaps, just holes in the crt board. That one you've got is in mint condition, mine has been use every day from new, of course now with a digi receiver box plugged into the phono sockets. I use it in the kitchen for radio in the morning and tv in the evening over dinner. It looks very old but still a good crt picture. I've fixed the radio at the station I always use to save having to retune. Just a little problem at the moment of the crt heater sometimes going off but that should be easy enough to repair. Nice to watch your video, thanks. I'll watch fully later.
I never knew what the point of a spark gap was. Thanks for the tutorial. This was fun to watch. The video games on the set were fun to watch also. Hope you get to restore the old RCA roundie. 21 incher?
It's a console, 25" I believe. I didn't measure it though so it could be 21, as they measured those differently. Hopefully it will be here soon to restore.
the old arcade games are awesome, i played them in the 80's, spent a lots of quarters lol. just recently found some goodies, been playing pac-man, mrs pac-man, dig-dug, Q-bert. it's nice to go back in time after playing modern games for so long nice job on the old set :)
What’s Up Brother, this was so much first watching you fix this little TV but then watching you play the games. I totally loved every second. What’s so cool is that we can remember when we saw these games for the first time. My Dad brought home the original “Pong” Machine and we played the crap out of it for a couple of months and now I don’t ever want to see a Pong Game again. :-) (I think it’s still somewhere in the house squirreled away somewhere) I remember all the different machines that these games got played on. I remember playing Donkey Kong and Frogger and Pac-Man on the huge arcade machines in the bars overseas when I was in the USAirForce. Love your stuff, you really Rock, can’t wait for your next adventure! Buddy (from the land down under...Florida)
Smashing repair, looks like a nice little set :-D Those blue caps can be a bloody pain, also known for going short. As a kid i had an old crown black&white tv, i thought it was fantastic. Later i was given a dead crown set with a radio combined, no sound at all, turned out to be a resistor that was covered in a woven tube, it looked perfect like new, it was open circuit.
Cool little tv. I got two small sony crt tv's. The games look great on those old tubes. I also found a 13 inch tv vcr combo at a goodwill for 6.99. It is made by orion. Renamed admiral for montgomery words. The crt is nice and brite and the vcr works great. I love your little panasonic portable with that really cool crt. I will look forward to watching your video on the rca console roundie. Have fun with it, and take care. Cool video. 😀
Great find 5 inch colour crts are rare I've got a couple of monochrome ones with the built in radio I agree with you can't beat the CRT old games look so much better on them brighter sharper better contrast and colour led lcd will never beat
I think we have both got the same mind set, could tell that it had eht, so my next guess would have been the video drive transistor/s, mind you I would of never guessed the spark gap was short. It's nice to see the proper component used rather than a coupe of etched points on the board. well done.
The spark gaps that were open I saw fail regularly. I have never seen one that is covered in heat shrink tubing fail, but this one did fail. I learned something too.
Such clean internals on this wee TV. I wonder, it probably hasn't done many hours if any!.... Normally the flyback has got a dirty coating along with the EHT connect to the CRT. I used to be able to hear the flyback horizontal oscillator kickup on pictube TVs the minute the power button was pressed but i've formed a notch in my hearing to it having grown old....!
Nice repair again ! from youtube image seem like the CRT appears to be gassy, as an old crt retired tv tech we used to install a CRT inline filament voltage booster on them who increased brightness allot we also had CRT test equipment that had a maintenance image booster mode on them also before installing a filament booster permanently ! I do appreciate your no nonsense explanation that go direct to the problem keep up the good work !
Definately not gassy. Has a fantastic picture on it. I am actually using this in my studio to monitor my Worverine film scanner as it is scanning film, because the image is superior to the 2"LCD on the machine.
The 1955 RCA color TV 21CT55 is very rare. First released in late 1954, it was the second generation color TV with a full screen. The CTC-10 (the first commercially available color TV) had a cropped 9 inch screen.
I love all of your CRT repairs, that's gives me at least a little knowledge on how all these things work. Hard to believe that fly back transformer can ramp it up that high from only 15V. Good grief Batman, that would make one hell of a stun-gun ey?LOL.
@@AThreeDogNight Absolutely. It is to accelerate the beam. The higher the voltage the faster the electrons fly to the screen. There is a limit though as the higher the voltage the more the xray production. Xray tubes are nothing more than crt with no phosphor screen and the anode voltage more like 70 to 80kv. The resulting beam is passed through what is being imaged and onto xray film or now onto a digital image plate for digital imaging.
I had my 2000 Quasar (Panasonic) VV-1300 CRT TV/VCR Combo, and the view was good while playing variety of the games, and watching the shows and movies, and finally I got the tape recorded back in 2006 is the Fireworks Display including Thunder Over Louisville from WLKY. =)
I used to repair coin operated arcade games and jukeboxes. The jamma connectors were a common problem in commercial arcade games They would overheat in time and burn the finger traces on the logic boards mostly on the 5.5 volt supply line because that drew most of the current
Nice work you do. enjoy your repairs you do. I own a toshiba 13"Crt TV 2005 had a Panasonic 10"color tv CRT 1983 it failed was a good set talking about a 5" color set a time when portable sets were built with quality a coming question why the new little DTV's don't pick up much over the air the station's
I should throw a converter box onto this set for an "Emergency TV" Since I grew up with the CRT, and spent over 20 years repairing them for a living, the old CRT holds a spacial place in my heart for old technology. I still after all these years am fascinated in how the operate. Plasma is also very cool the way it operates. LCD, well those are just boring, same with OLED. Plasma you have to pump the display with HV, and then trigger a discharge which fires until voltage is cut off to extinguish the display, then it is pre-charged again for the next sub frame. Very complex, and cool. CRT, put some HV in a vacuum, heat a kathode, and throw some magnetic fields around the outside of the jug, and watch magic happen. Fascinating. I have a couple of B/W TVs that I use exclusively as clock displays showing the time. One is very, very old. Had been used as a security camera monitor for 30 years, and it is still going strong, and runs 24/7. These things just go on forever, unlike modern crap.
I have the samsung branded TV... Pretty much identical except mine also has an AM/FM radio built in. Found it on a sidewalk throwout a few years back...
I love these small 5" crts ive got a sony 6000be which is a really nice set, I just bought another 5" crt from ebay bought as a dead set so will be interesting to see whats wrong with it when it arrives, its a lot smaller than the sony it's by some unknown make in a black casing but looks pretty funky.
nice little CRT and lovely cat haha Do you know of any way to reset the CRT tv service menu values apart from the service menu option? For some reason even though I select the reset option in the menu it does not run
Do me a favor and LEARN ELECTRONICS (me talking to myself after watching you kick some azz!!). Cool repair info, and a trip down memory lane to boot! Thanks!
12VOLTVIDS, what does the monitors B+ voltage control? if the B+ voltage is not set at a normal voltage at 125vdc it will display a scrambled image any reasons why? is the B+ voltage a bias voltage DC offset voltage for the sync and hold circuit?
Hello!! i buyed an crt 5inch tv, the tv works but i see the image has black border up and below, the image is more in the center, what can be check? will a fault of capacitor?? regards.
I've got a Samsung branded 5" set, turned it on for the first time in 25+ years using a VCR input but it seems to be only displaying in black and white. Any tips on where to troubleshoot first?
I have one of these - with the radio. The small size of it and the composite input makes it very useful. I wonder if there's space for a Raspberry Pi Zero to turn it into a little self contained retro gaming rig?
I should play it on my hi resolution commodore CRT monitor. That one has composite, Svideo AND RGB component video. Quite a rare monitor from an old Commodore computer.
I would think that game and the spiderman game are pretty rare in theses handheld plug and play devices these days. Especially as these are official licensed products.
12voltvids I repair different TV, pick up from garbage for play with original Xbox, but sinudyne and Telefunken (I remember type palcolor) makes after 5-6 years later, red pixed locked. Obiuvsly this TV has at least 30-35 years old
Great job fixing the TV. I got hooked on mini TVs when I got a red 5.5" one from the 80's as a gift. I hooked composite in to the main chip and connected it to a Raspberry Pi Zero. I love playing Game Boy games on it. Don't care that the refresh rate is small. I also bought a 6"color TV for 10€ at a flea market. Unfortunately I can't get it to show color image. I don't know if it's PAL or NTSC. So far all PAL devices showed in b&w. I'm trying to configure Retropie to be in NTSC so I know it's not a software problem. Have you come across similiar issues? Black & white TVs can be found online here, but colour mini TVs are very rare.
I'm real close to buying a little CRT tv on eBay. I remember when I was a kid, how bad I wanted one but never could afford it. Now knowing a few things about CRT's it would be very satisfying to own one. Just looking at that tiny tube is enough to want one... how could you not like it? It's like a small pet... Lol.
That one scares me. Only worked on one of those once. The first shop I worked at the owner had an rca and zenith roundie color set sitting in the corner. I was an apprentice at the time and I remember my instructor being thrown across the shop by it. Very high voltages in those.
@@12voltvids Oh, that poor man surely got a big shock. I imagined they had high voltages, after all they are one of the first tv's. Im sure you will sort it out in the end, you are a very capable tech.
@@santi0797 Yes when the owner of it is ready to fix it he will call me. Hopefully the crt is good. A suscesfull repair will depend on the shape of the tube.
Getting jolted was a hazard of the job when working on tube gear. I wear the few shocks I received over the years as a rite of passage. You can't call yourself a TV tech unless you have been bit a few times. It's gonna happen, sure as shit, just like if you are a race car driver, you are going to crash. Worst one I had from a microwave oven. That one hurt like hell, as did the 30KV jolt I got from a sony HV cap that wasn't attached correctly. I follow safe work procedures. One hand in back pocket when working around HV, and rubber soul shoes. No way for hazardous current to cross heart, and cause electrocution. You still feel it in the arm though, and it hurts. WHen they say you can't let go they are right. Your hand will grip with superman strength. I had to jump back to break the connection of my hand to a HV source in a microwave. Defective insulation on pliers was the culprit. My fault for not inspecting tools, and discarding them when damaged.I blame my old boss too, as they were the shop tools and he was too cheap to replace them. Just wrap them in black tape he would say. Well, that wasn't good enough as I found out.
@@12voltvids Lets hope the CRT is in decent condition, that will make for a great video. I am what most techs would call an apprentice, im just 21, and im slowly learning to restore my old HI-Fi equipment (and i only got shocked with 220v mains once haha). The problem is that i live in Argentina, and most people here retired a long time ago. In January 2017 i wanted to restore a Kenwood HI-FI combo that my grandfather bought for my father back in 1979, and i couldnt find one person that would do it for me. So i started looking aroud for videos of people working on that stuff. I can say that your channel is by far the most useful channel im subscribed. The knowleadge that is transmitted will benefit a lot of people for many years to come, since most techs are retired now. I succesfully restored so much hifi equipment of myself and some friends in the last year that is amazing. All thanks to this channel and some others. And even though i study IT. Engineering i find the analog world so much more interesting, i dont know why, i like it more haha. There is a youtube channel of a man named Jordan that also restores TV sets and some hifi equipment, i think he has some videos of some 1950's tvs, he even has a big tester that tests the individual colours of the CRT tv. ru-vid.comvideos , that is the channel, maybe yoy find it interesting as i do.
I've always wondered with today's miniaturization how small we could make a color CRT TV?? Sometimes I wish I was a multi-millionaire so I can pay some tech company to figure that exact question out!!
The 2 smallest color CRTs were made by Panasonic and Hitachi and I have both. Panasonic is a conventional 3 gun delta matrix shadow mask tube. Measuring a 1.5" screen t was featured in the ultra rare CT101 TV. Hitachi made a beam index tube that was slightly smaller a 1.25" that was used on a few video cameras. I am in the process of fixing one of those and hope to get the color sync circuit working soon. The beam index uses a single gun, like a black and white tube but has a striped tube surface and uses sensors to detect where the beam in to trigger color timing circuits to switch between the red, green and blue channels as the beam passes over that portion of the screen. I also have a beam index video projector that uses a single gun tube.
I have a 4.5” Spartus B&W TV which I bought back in 1986. It’s worked fine up until recently. I have picture and sound but I can’t pick up channel 3 (where I have my VCR connected to it) I have checked all the connections but I cannot get any signal through the external antenna Jack nor the built in antenna. Could it be a bad analog tuner? Any ideas?
12voltvids now doing game reviews! Still, you cannot have too much diversification! If the beam index monitor part comes in I would love to see a video of that. I have never even seen a screen that small before yet alone in colour. Also, that screen in smaller that my mobile screen, yet it looks a lot bigger on camera. Strange to me, that.
It is most certainly a 4:3 aspect ratio and it works great. I am using this as a monitor for tape transfers to digital as it is big enough to keep an eye on what is going on during the transfer and small enough as to not use up all the real estate on my desk.
I'm searching for a 5" color crt Megatech brand tv - made by Samsung Korea, accase do you have the schematic diagram any or a link where I can search for it ? thank you
Yes I remember that one. Used a 2" tube that would have been used in broadcast ENG cameras of the day. Then they went to a 1.5" tube. The first VTR portable I ever had was an Akai 1/4" reel to reel black and white system. It had a tuner pack and a little 2" TV that clipped onto the side. A part failed on it, and no parts were available to fix it. (used these orange potted modules and when one failed there was no parts available.)
@@12voltvids I have one and after watching your video I got it out to see if it still worked, it worked. If you are interested, and know of someway that I can ship it you are welcome to it.
@@nomanjones4803 Sure if you don't want it I collect small crt sets, old cameras, old radios ect. You can email me and I'll shoot you an address where it can be shipped.
This one would be easy, as it runs on DC so no isolation needed, however it doesn't have OSD, and that is where the modifiers insert the RGB signal. Would have to look up the YCJ IC and see if it has the inputs available.
I had a Radio Shack Portavision 5" color TV with a similar Samsung tube in it, which sadly went to air. I found that while the color was excellent, the horizontal resolution was really low; I counted around 200 lines.
Yes the horizontal resolution is pretty low on these tubes, because they used pretty much the same mask pitch as regular larger tubes. I do have a few very high rez CRTs including a monster 21" multi sync Viewsonic computer screen. That being VGA RGB, on a PC it is bloody amazing. I also have a high rez 14" commodore monitor that uses a delta matrix tube and is of considerably higher resolution than the inline gun types. The trinitron was one of the lower resolution tubes. Most couldn't do much better than 200 lines of horizontal resolution. This is why they looked so good on crapy VHS tapes. I remember when I worked in broadcast we would never use a Sony TV to check for quality as they were so poor that everything looked good. We used Conrac monitors for evaulation. I have 2 Conrac monitors stashed away and they look amazing if you give them a good signal. Give them a VHS signal and they look like crap, because VHS was / is crap and the Conrac shows all the limitations. They came out of a broadcast studio, and I used them in my production studio back in the analog days, in my editing bay.
@@12voltvids To suggest the Trinitron tubes had a resolution of 200 lines is like saying the QE2 can only carry six passengers. I could display high def (900 lines+) on a profeel trinitron in the 80s. They were and continued to be better - brighter/sharper/more linear/better colour than (almost) any shadow mask set up till the mid 90s, when the technology eventually caught up.
@@martinda7446 Trinitron tubes had horrible bandwidth. Ask any broadcast engineer. Now they did get better but when I worked as an intern at a broadcast station any crap tape played on the Sony monitor looked great but looked like crap on the conrac and tektronix monitors. The reason the engineers said was the bandwidth on trinitron wss only about 200 TV lines. Not scanning lines there are 525 or those. Horizontal resolution was said to be about 200. Put up a mono scope test signal and see for yourself. We never used Sony monitors for picture grading. We had plenty in the studio for studio monitors but in the control room it was all conrac and tektronix for color monitors and electrohome for the bw camera monitors and a real high rez conrac bw monitor on the camera control unit for camera registration. Adjustments.
The reason that trinitron tubes looked so good was because they couldn't display the fine detail, so they made everything look good. They did get much better in the 90's with the XBR line, but the earlier tubes were always soft. That is why they looked good on cable TV, they masked the noise.
We tested them in the studio, and they all fell far short of acceptable for broadcast color grading. There were big signs warning production staff to not rely on any of the trinitron monitors when grading a tape received from the field, as they might look fine on the trinitorn, but not meet the standards for broadcast. This changed when they came out with the fine pitch used on the XBR and Profeel pro, but prior to that the original trinitron were pretty soft. The also had 2 fine wires that ran horizontally across the tune in the top and bottom 1/4 of the screen. This is why most computer monitors did not use a trinitron tube.
Hi, I'm really hoping someone can help me out here - I have the same TV, although it is branded as Samsung on the outside and I bought it in eBay, working condition and screen was working with screenshots from the seller. However I've received it now and the screen doesn't work. Everything else works fine including the radio. I took it apart but my one doesn't have the same spark gap thing, they just seem to be missing entirely - anyone know what I could try??
He used a camera with a colour bar generator. If you want a TV pattern generator they are cheap as chips on eBay or easy to make a simple one too. Or an old personal computer with a modulated output can generate simple patterns.
neat now i learned something bit more from these. i didn't know that one thing on the fly back was a voltage adjust oops. some monitors i had where they were sooo dark that not even contrast and brightness on max could make it visible that i used that to brighten them up some just enough to be seen like it should of been. hopefully that wont hurt anything. also i have an old 19in like toshiba tv and if if runs to long it starts to buzz in a weird way mostly on blue. sounds like a florescent ballast but with a deeper sound. i thought id ask as i have tried to research but i found nothing much about it other then its probably the vertical yoke or something.
Yes it is probably the yoke buzzing as it warms up. The put glue all over it to glue the winding to keep it quiet. Sometimes they miss it. Hot glue works great to quiet them down.
The 2 controls on the flyback are the screen and focus adjust. The screen sets the bias voltage to the tube. Too low and you get a dim picture, too high and you get a washed out picture.
oh i see so its nothing major on the yoke then its weird never did that then it has lately. just use it for well same purpose retro consoles/games aha. and for the voltage so increasing it a little is fine then. i find as years go by they are so dim to point brightness and contrast do nothing so i always just put them on default then twist the fly back till just bright enough so that if i do turn the brightness up it does its job again. thanks for the reply cause i was worried i might of did something wrong doing that.
Nope, not if it is a loose winding. They used to make a spray that you could spray on and it dried to a rubbery type coating to quiet down noisy flybacks and yokes.
oh nice i see. ill see if i can fix that in time. thanks for the replies (not many would for me when i have concerns for things that they work on and know that i don't) i still love crt's so i worry about mine when they behave weird beyond my knowledge. also subbed got so much stuff here to watch.
I have a Cosmo black and white 5" like this one and it doesn't work properly, the image is compressed verticaly and the tv emits a crackling sound... i'd like to have your skill in order to repair it!!
That would be a capacitor in the vertical sweep circuit that is causing it. These are simple circuits great for learning on. If you understand electronic basics anyone can learn it. I learned as a teenager, and honed my skills for 20 years when I was doing this for a living. You never stop learning. I still learn new things today, and I have been servicing electronics for over 35 years now! Get yourself a schematic, and do lots of reading and watching. You will be surprised what you can pick up. I never did plasma or LCD tvs in my career, yet I have fixed a few of them. Right here. The plasma sets you see me fix here are the first and only plasma sets I have repaired, and I knew very little about them because they came online after I had left the business professionally.
Yes I was actually thinking of doing just that with a 14 or 19" TV. Make a dedicated pack man or spiderman game. If I had wood working tools and skills I would do it. My dad had lots of woodwork tools, radial arm saw ect. My brother in law took those and tossed a bunch of them. A table top pacman game would be fantastic.
You could use a Raspberry Pi to run any game you want. Older ones have standard RCA output for video, newer still have it on the audio jack, you just need the right cable. Game controls can be wired up to the pin headers on the Pi. So could a coin mechanism. Bonus points if you can only play it with Canadian pennies.
@@coyote_den Where do you find games for the pi. I have a few of them kicking around. I use them as media streamers into sd modulators as they have composite out. I have a pi2 just sitting on my desk.
@@12voltvids you'll want to put a RetroPie image on one for the MAME emulator, then you can find the ROMs by googling MAME ROMS. Some ROM sites are less than reputable, so be sure to private browsing and something like NoScript or uBlock Origin as the ads are what try to push malware, not the site itself.
You are a true old school gamer! congrats! i have 3 of this little tv without composite input, can you show a method? or svideo is possible for the Commodore 64? thanks great video
@@nopochoclos My son would kick my ass. He is the gamer. Got about 10 grand into his gaming computer. Me Pac-Man is about my limit. Actually I have a first gen ps3 which hasn't been turned on in years.
@@12voltvids haha, it must be terrible equipment, here they are unbeatable, I assembled computers decades ago. The reference to pac-man, are those of the golden era my favorite and those of my collection, here I have 11 crt monitors among them Commodore, machines of my collection that go from Texas Ti99 / 4A .. Commodore 64, 128D, Atari 2600 , 130xe, MSX, all in use and enjoy playing, now im testing WIFI cartdridge an RETROTERM an Argentine terminal project that takes the commodore 64 to something that you would never imagine, transmitting decent quality audio via BBS .. it is one of my hobbies, I see your channel a lot is learned, you are very didactic really thank you for that.
Making a battery pack for that thing would be dead easy, just get a bunch of cheap NiMH batteries and put them in the battery compartment. There's already a CHARGE light which presumably charges the pack if the set is plugged in.
My tv only works color by antena but dont be video of consoles, i tryed with pal and ntsc but nothing works, this tv is pal or ntsc? Whats can be test to trying be color?
@@12voltvids i test by 3 consoles (sega genesis, ps2 and snes), and find a dvd player with pal and ntsc and nothing worked, black and white works perfect.
Oldest B/W TV I have is a GE branded 12", goes with the GE branded Sony made 1/2" reel to reel video tape recorder. This would date about 1965 vintage.Still plan to overhaul that one day if I can ever clear out the workshop of paid repairs. They are coming in faster than I can fix them these days.
@@12voltvids Thanks for the reply, may I say watching your videos has become a real treat over the last few years, especially repairs of older hifi equipment, which is so educational and useful, many thanks for that. Looking forward to the next repairs and hope the cats get a cameo role soon!
The older hifi gear is something you will see more of as more and more people are figuring out that I am still servicing it, and I get calls from old clients I haven't seen since 2003 when I left the business. There is still a couple of shops operating, one even offered me a job working there recently as in about 5 years ago. No thanks, I'll stick to my union telecom job during the day, and moonlight as competition for the shops around, and make videos. Wouldn't be able to do this if I was still working for someone.
Retiró el chispero de protección de pantalla... ¿Y el repuesto nuevo... en qué momento lo instaló...? ---- El televisor quedó en pelotas ante una sobrecarga de alta tensión...
I base my videos on here the views are. Views = money. The vintage and CRT videos draw lots of views. I get more requests for CRT videos, and VCR videos. Why, because believe it or not there are people that still use them. Retro gamers seek out old CRT sets to play their raster based game consoles on because they do not work properly on modern sets. Too much lag.
