From junk to awesome: Fixing an old monitor by swapping the CRT
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- เผยแพร่เมื่อ 29 ก.ย. 2023
- I found this security camera monitor in a the trash several weeks ago, and was surprised how great of a monitor it was. Sadly, the CRT in it was very burned in and worn out making it hard to enjoy. So in comes a filthy trash picked TV where I use the CRT as a donor to rejuvenate the other.
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As much as I love all the computer content, I will not ever skip a CRT episode! Great, as always!
I remain amazed that CRTs were as cheap as they were. They're so tweaky and fiddly to manufacture and set up
It's amazing how cheap something can get once the economy of scale gets going. It's also why once that great machinery stops, there's really no getting that stuff back.
@@Nukle0n Indeed. When the demand was hundred of thousands per year, you could make CRT's relatively cheaply. Now, it's forgotten tech. Nobody can make these anymore. While we still have the knowledge, the infrastructure is long gone.
There are new vacuum tubes being made, but they are expensive, since they tend to be hand made. But nobody, as far as i know, is making CRT's.
I have a couple of new in box CRT based monitors, and i am holding on to them for dear life. ^-^
They were only cheap because of slave labor in China.
TBH the cheap stuff was pretty much crap. Those small TV screens were really low-end. Low resolution, produced whine, no good antiglare surface, nothing. Similar could have been said about the cheap monitors (by monitors I mean VGA). The high-end Trinitrons that produced really great image and handled resolutions like 1600x1200 or 2048x1536 at 85hz were pretty expensive. Did I also mention they did not whine? Pretty much monitors never did, I noticed that only on TVs I wonder why. Anyway, the quality was there. This ironically greatly helped the LCDs to take over the market. They were crap, but most people only had the chance to compare crap LCDs with crap CRTs, so the arguments of power and size won. Unfortunately this killed the high-end CRT market as well, but there the LCD was no match as replacement, and still is not.
@@Lady_Zenith Only with OLED, LCDs were going to come ever so close to the contrast of a CRT
I'm having a lot of nostalgia for how I taught myself electronics in the 1960s. When my father would take me with to the local city dump I would collect all the radios and portable televisions that looked either reparable or like good for parts and take them home. There was a public use tube tester in the front area of a grocery store and a couple of the local repair shops would sell me parts and occasionally offer troubleshooting advice. I could check out Sam's Photofacts from the public library, which was mostly to see what voltages were expected and on color TVs to get the convergence procedure.
By selling the repaired items I could afford to buy what I needed from Radio Shack to experiment.
Good memories.
The CRT videos are my absolute favorites. I remember being so curious about how our tv worked as a kid, so this scratches that itch.
I picked a smashed vape pen from sidewalk, and used the USB-C socket to replace charging port on my BT headphones. I can always come here to feel slightly less crazy.
sometimes it is important to have the "Weapon of Choice" to fix things.
Walk without rhythm...
It annoyed me that you didn't manage to clean off a spot on the CRT ...until I realized it was a spot on my own monitor. Great video.
Same
Would've been nice for him to get that too, while he had the wet rag out and everything . . .
"If you walk without rhythm, you won't attract the worm."
I immediately recognized Weapon Of Choice. Love that music video.
That discoloration on the old tube you see, might actually be the glass itself turning brown due the electron bombardment and soft x-rays that are stopped when hitting the glass.
Fantastic swap, easily equivalent to a heart swap in a person. Congratulations Doctor Adrian.
One of the best parts of your videos is, how "freakin'" happy you always are repairing all this stuff... That makes all of us surely happy repairing stuff, too.
The brownish stain on the inside of the glass is tungsten. The filament is constantly boiling off tungsten as long as the tube is on. This is the key factor in the lifespan of incandescent bulbs. Tubes tend to last a long time, because the tungsten is never heated to a bright incandescent level. But most tubes fail either because the filament goes bad (boils off) or the vacuum is compromised.
Vacuum tubes have envision problems from the coatings on the tungsten getting sputtered off. They don't use better tungsten. Only high power tubes might, and then they usually use a tungsten and thorium mix
Weapon of Choice
This kind of video brings me memories. I am (2 weeks shy of) 55 and from 14 to 16 I did electronics apprenticeship and one of the things we did quite a bit during the last semester was to repair TVs and at that time, of course, it was always CRTs.
Happy 55th Anniversary tomorrow (?) All the best, Per (Denmark)
i grew up working for TV shops, and became an expert in CRT TV and monitor repair. i've done many CRT swaps, and even done "the hard part" of swapping yoke and convergence assemblies, and doing the full alignment process, usually a 2 or 3 hour process. i even wrote my own test pattern software because the company i worked for couldn't afford the $10,000 for a test pattern generator for Mono, CGA,EGA,VGA, and SVGA. i wrote test patterns for general monitor testing, as well as specialized test patterns for the convergence adjustments.
So awesome that you used your CRT tester. I don't know why you didn't just desolder the yoke wires directly froim the yoke then you don't have to cut any wires. This is what I have done then I did a tube swap in the past.
Yeah, with the yokes being identical I'd have just desoldered and re-soldered the deflection wires, bonus is that then the loom is exactly the right length too.
The last two numbers of a colour CRT model are the colorimetry, the actual temperature for the phosphors, P4 is grey monochrome, P22 is NTSC/Pal,modified standard, and P95 allows for a wider colour gamut with the correct matching demodulation vectors. P95 can be better than P22, but the correct demodulation matrix and a higher white point have to be used.
Nice another CRT saved from landfill 😄
Super long videos are always great👍 I love the long videos, today most videos are very fast and minimal.
Yes, the longer the better!
Longer are the best, it usually explains slow and detailed. Don't miss small details of amazing repairs like this one.
ah yeah rejuvenating color CRTs is always a gamble. Do it when you have no other options. That being said, some of the CRTs I gave this treatment still work 10 years after. Little hint : ramp up the filament voltage gently from cold condition until you see arcs between the cathode and G1 then let all cool again then repeat until there are no more shorts or you burn a hole through an electrode 😂
The cases used for a lot of security camera monitors are nice and utilitarian 100% convenient.
The end of the CRT type code (after the X, which means RGB color phosphor) indicates the bonded yoke type. So yeah, that's the only difference between the two tubes.
This might be overly specific, but I used to live somewhere that had a very active trash picking culture, Fairbanks AK. There were even little "give and take" recycling areas at many transfer sites with a concrete slab and a roof. Cutting off a power cord was a courtesy to dumpster divers that indicated that an appliance or whatever did not work. It would save someone the trouble of lugging something home only to have to bring it back again. I don't throw out many electric things but I'm still in the habit of cutting the cord before I do.
i can't get tired of crt episodes!
Adrian's analog attic. Never going to give up that. Adrian, you are missing out on a great channel name.
As the for the cut cord, it's made both to recover the copper by scalpers, both as a part of a myth that claims that if you leave a CRT on the curb and someone injures himself by tinkering you're still liable for that
Been working on CRTs for a while now but I always learn something from your CRT videos! I appreciate how detailed you get into the specifics of the deflection, convergence, etc which I always find a bit fiddly but your videos give me more confidence to approach those repairs.
The lines separated at the very top of the picture indicates worn-out capacitors around the vertical power amp IC. You adjusted the vertical position so the issue is out of sight, but it's clear that the picture centering is wrong, it needs to be pulled down a bit, but then the bad vertical linearity on the very top will be visible. You should do a vertical output recap, and I would also replace all the capacitors on the primary of the PSU (except the mains filter). If you do the RGB mod, I hope you will address this, too. I suggest to put a blob of silicone on the end of that convergence fine tuning strip, because there's a good chance the glue under it will dry up and the strip falls off at some point.
34:18 You're Walken close to the edge, risking a content match on that
That's very similar to the Philips TV I had in my bedroom! Not identical, the control panel under the CRT was a bit curvier so it was probably a few years later. But the back panel is very similar - mine had SCART of course, and no RCA inputs. Just the one SCART. It supported NTSC, PAL60, and PAL (no idea about NTSC50).
Ooh, I always loved that quiet crackling sound on our family computer monitor and my dad's big TV. Sometimes I'd just hang around in the office after turning the computer off, feeling the static in the air (and on the metal venetian blinds). The little portable ones in the kitchen, etc, never did that to my recollection.
Love to see such an unqualified success. Feels good.
By the time these CRTs were being produced I can't imagine it was very affordable to produce them anymore considering how much work was required to make them versus the newer LCD units that can be more easily manufactured in layers.
It still amazes me the ingenuity of building such a complicated way to scan an electron beam over the phosphors of a screen deflected by a magnetic field to display a picture and then with colour screens to get even more specific and hit the correct color phosphor points on the screen. This is why bringing a magnet close to the screen or not using the degaussing coil results in color shifts and bending in the picture.
Still 30 years later many LCDs are now long dead and these units are still working. They have amazing longevity as long as you don't leave the same picture on the screen forever.
Always awesome to watch crt videos, you could say it’s a Weapon of Choice 😊
so many options - you could go with this, or you could go with that..
Make a fat boy seem slim! 😮
When it comes to CRT identification numbers, the last digits that come after the "X" denote the "ITC" or Integral Tube Component. This means that the CRT had the deflection yoke and convergence assembly installed at the tube factory, and it was supplied to the TV/monitor manufacturer as one complete unit. So the base tube (and mounting points) are actually 100% identical. It's just the deflection yokes which are different (but still electrically "close enough" in this case, as you found out).
The tube number is actually A34AGT13X. It was made by Chunghwa, which was a big time tube manufacturer based in Taiwan. Manufactured in Malaysia, this is a super common tube found in many 13" consumer TVs and low-end security monitors from the 2000s.
Also, nice to hear you got some advice from Sark on this! He's a legend in the CRT community.
Great video! Cheers, Adrian.
All the TVs at my local dump get their cord cut off. They don't want people taking them. Won't even let me look through them.
What a great move to have what seems like an extremely low time CRT going into a that very capable monitor from the security system. Very nice work, I think all the videos you make are really fun and educational and really bring me back to my youth.. thanks Adrian!!
@Adrian's Digital Basement
Close but no cigar, remember there is vacuum inside, so whatever flyes flyes in a strait line until it hits something, the the brown area is not in a direct line of sight of the filament.
The deposited metal you see there comes from the shadow mask the electron beam scans over, its powerful enough to sputter off small amounts of the the material the mask is made off these fly then backwards and get deposited on the area you noticed.
What can remove minor scratches from glass is optical rouge and a buffer wheel on a dremel. I've repaired scratched GLASS watch crystals that way. (don't try it on plastic watch crystals. Ask me how I know that won't end well!) If your doner CRT had the 'dag' coating flake off, you can still use it by putting a 500pf door knob capacitor across the HV lead to ground. It would have to have a voltage rating of at least 30KV. Transmitting capacitors of this kind can be found surplus. The last two digits in the CRT part number are usually for the type of screen phosphor. Maybe 'rare earth' vs something else? Or perhaps the resolution of the pixels?
Tempered glass usually shatters when polished you have to have it constantly cooled with water and even then it's likely to shatter.
You can just repaint the aquadag on the back of the tube, I did this with a Sanyo 20EZ arcade monitor and it worked out great. It's just graphic paint.
Fatboy Slim: Weapon of Choice - featuring the one and only Christopher Walken, who has always been a fantastic dancer.
12:53 Try to support the tubes only by the screen area. Don't stress the neck as you did here by placing some box under its deflection coil assembly.
16:10 Ground wire should be the last connection to unplug. Otherwise you risk a minor shock or damaging the electronics if the tube happens to be still charged (common with monochrome tubes even after years of lying around).
ok 1 great swap and 2 that ghostbusters cart brought back memories as i used to play the floppy version on my cousins C64 growing up :)
I remember talking to a scrapper a while back, and he told me that they smash open TVs to get the deflection yoke, as it's more copper than the power cord. Kinda made me sad.
That turned out to be a sweet little monitor
Great job Adrian!! You look so proud of the set! Proud of you man! You lift the curtains on what makes this strange magic of CRT work! ❤
I heard that there is a company in the US that refurbishes CRTs, even replacing the phosphor on the screen if needed. Probably will be expensive, but should be interesting to investigate that possibility.
if it's the mob I'm thinking of I think they only do mono CRTs.
@@SomeMorganSomewhere I believe you are right, but even that would already be useful (if not for that specific CRT, at least to others).
Your boombox shirt cracks me up. A JVC M70 with the meters and tweeters from a GE 3-5259 Blockbuster inserted between the woofers and radio dial.
Adrian: *Plays Fatboy Slim - Weapon Of Choice music video*
Also Adrian: *Turns it off for copyright*
Me: _"Damnit Adrian!"_
BTW - those rubber gloves won't stop high voltage.
Sweet! Done this myself many times. Always a good feeling.
Glad to see that awesome monitor finally having a good display.
I always snip power cords when leaving any mains powered devices out for rubbish collection (we have a council curbside service here, 6 trailerloads a year). I do it to prevent someone frying themselves from a wet device or starting a fire. If someone wants to put a new cable on, at the very least they are prepared to open the back and check it for damage so my conscience is clear.
Not once did Adrian do a Rod Serling. We control the horizontal......... :)
Great video!
I did a similar swap on a Galaxian arcade machine that had severe burn in. My donor was a 19" TV with low hours.
I believe the last numbers in the tube part number indicate the color of the phosphor. The TV tube I swapped in had a darker phosphor and it gave the game great contrast.
When LCD TVs came out you could find CRT TVs in thrift stores almost for free.
3:36 Yep SDTVs were plagued with penny pinching feature removals in hindsight, so many jungle chips could have done way more than they ever did. Even the VHS home video boon era didn't see a tremendous surge in Composite capable TVs, they made RF-coaxial only models way, way too long.😒
I think we're past the era of elitist scoffing at low end CRTs lol, going from side of the road picks, to picks from recycling centers only, to no picks at all eventually ijs. It's DIY projects but a lot of SDTVs could do so much more than we knew, like RGB capable ones alone that might have S-Video ports heh.
Great job man, pretty nice finding matching donor parts.🙂 Truth is in NA most of us that lived through the SDTV era never actually experienced all they could offer. Personally I only used post Composite AV port types just a little after DVD started, where S-Video had been around for more than a decade already.
At my local arcade museum, there's a Centipede with 19 inch CRT that's driven from a Commodore 1084 chassis (which is for 14 inch CRTs) and it just works (with minor vertical breakup at the top (left rotated) of the screen).
Shocked with how easy this went! Awesome!!
I enjoyed this a lot and watched it from start to finish. One thing I noticed is that you explain every step which is great, but maybe when you make a cut, you can put a brief cutscreen+audio pause? Certainly viewers can pause whenever they want, but they won't know when. You know yourself when a new step of the refurb is starting, so you can put a pause there. This will also later let you find and put chapters more easily. (I've thought about this from my old videos, and it's something I want to do for my new ones.)
34:19
It's from the music video to Weapon of Choice ft. Bootsy Collins by Fatboy Slim. Christopher Walken was asked to do the video by some roundabout way, and he, against all expectations, said yes.
Amazing video.
I'm a big fan of using a softmodded Wii with the 240p test suite for test patterns and color. This is amazing and glad to see it!
The plastic case could be re use to do a all in one retro PC using an LCD panel.
Wow, what an improvement!
I got a CRT TV for my birthday, I think when I was 14, which means it's over 25 years old now.
I had to repair it once (Dry joint), but it's still going great.
And yes, I use it every day! It's my alarm clock! It's probably on and running for an average as 3 or 4 hours a day currently.
One thing we don't see often is testing of old CRTs for X-Rays and making sure that their protection circuits and components are still at spec.
Any thoughts on this?
Correction: The capacitor formed by the CRT envelope is actually the filter capacitor for the high-voltage DC supply. Very early TVs (late 1940s era) actually had CRTs where the portion between the screen and the neck was metal (!!!) and in order to properly filter the CRT anode voltage, there were usually a couple high-voltage "doorknob" capacitors installed next to the rectifier tube. Thankfully some engineer was able to figure out how to eliminate that extreme safety hazard!
I believe it was only larger round CRTs which had metal cones. AFAIK normal sized ones were always glass envelope. I think there were yield problems producing larger pieces of glass without defects. A side benefit of metal cone CRTs is they weigh much less than all-glass ones.
16 and 19 inch monochrome from the late 40s and 21 inch color from the late 1950s are probably the most common metal cone CRTs used in American TVs. Types 16GP4, 19AP4, and 21AXP22.
Fatboy Slim - Weapon of Choice. Video is just basically Christopher Walken dancing.. Which little known fact. He is a really good professionally trained dancer!
Love your enthusiasm - thankfully you use your voice to emphasize things instead of your hand movements which infest too many other channels making their shows unwatchable. I love how you repurpose tech and fix it that would have otherwise been scrapped.
There are places that recondition CRT's they are amazing, and I am not sure how many are left but I have seen video's on TH-cam where they take the CRT's apart redo the necks, yea very skilled glass work people and they can change out the guns. Amazing to see. I only have one CRT left in the house a Commodore 1084 I think that's what it is. Anyway, I only use it for testing my retro systems on so I don't use it all that often. Last time I worked on anything CRT was back in the 1990's only because I had some injection molding machines that had CRT's and the originals were from Motorola the replacements were from Zenith and they used to be cheap but when they became hard to get, I had to repair them, and I hated the Zenith CRT's at the time the last American manufacturer of Tubes before Goldstar acquired them. Honestly CRT's have always scared the hell out of me I can work on them, but I chose not to. I do know for retro computing CRTs are special, but I am too old and it's not my most favorite thing the service. I can do it but chose not to.
Those two CRTs actually have the same type number.
If you want beautiful CRTs, I would check out the old JVC CRT tubes. The colors are absolutely stunning! It's puts even the best OLEDs to shame.
thank god, I've never had to do any repairs on a CRT, although I do have a little portable monochrome unit where I've added a connector to the wires going to the deflection coils, more so I have some flexibility if I ever case mod the CRT or have to do any other repair work. as well as converting it from RF to Composite.
Love it, nice work Adrian. I am dreading the day my PET's CRT fails...when it does I will be revisiting your channel for help!
Nice monitor, Adrian :)
But if you really want something that rocks, from the 80's, then consider getting a Sony HDM-3830 Trinitron monitor, from 1983, with 1080i resolution, and RGB input.
I spy kimtech wipes in the background!! I'm working in a molecular bio lab for grad school and those things are fantastic!
Those were received in a recent mailbag.
I'm in CRTs and MIDI stuff, what a lovely day!
Hello Basement
Great job, Adrian!!
I've seen similar sets RGB modded this was the perfect length :)
FYI, many landfills require power cords to be cut off before accepting. I don't know why. (-:
Love your long videos :)
Fabulous work as always!
Nice work on the tube swap Adrian! I was also able to catch my name at 39:24!
You were extremely lucky to get the exaxt same tube ansd ab almost identical deflection yoke ! replacing a tube in 2023 is like playing lottery
The Walken is always my Weapon of Choice 😉
Great work!
the carbide ball of a ballpoint pen will damage a crt too. learned that the hard way as a kid
I've replaced the CRT a couple of times with the "wrong" tabs on the implosion band. 3D printing four simple distances solves that problem.
I think I said something about it being an interesting idea if the CRT from that other Magnavox television would work in this monitor, and now we get to find out, very handy that someone had a similar TV to donate... :D
Awesome Video I glad you got that video Monitor working. But at 32:20 I kept noticing a Black Line / Bar on top of the screen, it was also on that 90's VHS Tape you were playing too
nice replacement of crt. i would have desoldered the harness from old crt to new one so that dont have to splice wires.
That monitor will look great with a curtain super cool pc that you maybe working on soon ..
Considering that all the rest of the serial codes are the same, the last two digits might refer to the week of the year they were made.
Fatboy Slim - Weapon of Choice
Get that VHS tape about men and women to Dr. RIP VHS! He lives in Portland.
Very nice indeed!
Good job!
I just wish I could find a suitable tube to swap into my EGA monitor!!! Found a couple tubes, but the pinouts are different!
working in a tv repair shop i've rejuvenated 100's of tv's and have be successful! but you have to know what your doing to get good results!
Great job
Fairly common for US Philips sets to sync to 50z.
Also many of the later mod Philips/Magnavox can often be modded for YPbPr intput.
Would the missing 30 cents components that Adrian mentions, be the PAL delay line by any chance? It’s basically a passive component made from a calibrated piece of glass inside a case, with a wire attached to each end.
@@telocho That, and a 4.43 MHz crystal I guess.
It might be an idea for Adrian to include model numbers as a matter of habit (eg in video titles or description) in case people are looking for videos on these specific models