Sony Rear Projection TV Teardown and Analysis

[@BGTech1]

Watch my newest teardown of a expensive and complex DLP projection tv! kzbin.info/www/bejne/opnGk2unaquYbcU

[@BABA-ws5eo]

great video. I'm amazed at the amount of engineering that goes into making something like that. And this is even many years old.

[@BGTech1]

See my newest projection tv video. I’d say it’s about ten times more complex. It’s really quite amazing.

[@BGTech1]

Rear projection TVs where invented in the 1970s without the use of computers, which is really incredible.

[@frankpitochelli6786]

I repaired so, so many of the projo tv's...I was in the TV Repair bizz for almost 40 years...some were built very well and produced excellent pictures, but, once lcd hit the market, projection tvs were rendered useless. DLP was actually an excellent form of projection TV, but they weren't practical to continue that technology. It was actually amazing the amount of technology that went into tvs from the 80s to early 2000s... Many manufacturers were operating at break-even costs during those years. The TV Repair business was very profitable during that time, but, it all came to an end by 2014. Now it's strictly retro and antique restoration....some services are still needed, but the service business is a part time hobby today.

[@BGTech1]

Thanks for commenting. I’ve always been more fascinated by DLP. After taking one apart I’m not surprised that they are just breaking even. CRT rptvs are interesting too, but more primitive. It seems like they would be prone to more convergence issues.

[@ericcarabetta1161]

2:38 This is the lenticular lens, you can stand behind it like an invisibility shield.

[@jackjones9460]

I just took apart a similar tv design but did not break it down like your did. I wanted the fresnel and CRT lenses but had no clear idea what the other stuff was. I’m glad I kept the electronic assembly so I can try examine and maybe use some parts later. Thank you!

[@BGTech1]

Thanks for watching! I’m glad you enjoyed my video.

[@james_horan]

I saved the CRT lenses from a teardown of my own. What would one use those for?

[@h7qvi]

Greek letter mew for 'micro'-processor. Old service guys used to get sun burn or something from the x-rays emitted by those CRTs. It's good that you show data sheets

[@BGTech1]

Some chip manufacturers make it difficult to find data sheets. Fortunately, Sony is not one of those brands. I always enjoy looking at the data sheets because they are full of useful information.

[@h7qvi]

@@BGTech1 A lot more is learnt from fixing things, studying how they operate with an oscilloscope and reading datasheets, than from any college or university course.

[@Alexander_Sannikov]

it's not "mew" and it's not "meow", it's "mu".

[@commandoPR]

Ackcktually it's μ

[@unclecooper9409]

10:30 They call this chip a “jungle chip”. It’s basically an amalgamation of different circuits used for Various crt functions.

[@thatshowtheyare9227]

Would be nice to see you break one of those CRT to see what's really looks like inside

[@BGTech1]

Breaking open CRTs is potentially hazardous. There isn’t much on the inside either, it’s mostly just an empty vacuum. The front glass has a phosphor powder and the electron gun is inside the neck (skinny part) of the tube. Regular full color CRTs have a metal structure inside called a shadow mask.

[@haphizyahmad8788]

hello... I'm watching from Malaysia... interesting to watch this old widescreen technology...

[@Alpha17x]

The fresnel lens magnifies the projection that's hitting the mirror in the back and makes it fill the screen area, but that alone makes the image look warped, exactly as it would under ba magnify glass. The lenticular sheet (straight lines) straightens the image, eliminating that warping. The acrylic sheet protects everything else and make the physical structure of the lenses invisible to the viewer, unless their face is right against the screen. This same technique can be used to make your own rear projection screen, though if you're not bouncing off a mirror and instead pointing straight at the rear of the 'lens stack' you'd need to add a light diffusion layer like LCDs have. I'm not an expert, i just spent a lot of (fun) times messing around with stuff like this.

[@BGTech1]

Thanks so much for the great information! I’ve always wondered about the exact purpose of the different lenses.

[@pacthesir]

You know what's odd, when I was younger, I would always be fascinated by these big TVs, one time while I was bored, I looked into the TVs front still covered with the material, and found Red Green and Blue lights, at the time I was confused on what those were... Eventually the TV was trashed... I never got to see the inside of it. It was an old RCA tv. I think it was from 2000 or 2001.

[@BGTech1]

When I was a kid theses TVs were already 10 years obsolete, but people still were getting rid of them. My parents wouldn’t let me take one home, so if it was in my neighborhood I would take parts off before the garbage picked it up. I think it’s surprising to most people that most of the tv is just empty space. Only the bottom part has the parts.

[@askjeevescosby2928]

These are great for light gun games. You can get huge tvs like this up to 70 inches and have all the benefits of a crt since they use tubes to create the image. Only set back is the brightness.

[@Maximus-the-7th]

You can use the glass as a huge magnifying glass to melt the metals using sun

[@BGTech1]

Yup, I have plans to make a frame for it so I can use it for experiments like that.

[@THEATREGODou812]

That's the problem with those Is you always had to sit directly in front of them The fresnel lens and then go Is designed to spread the light out The piece with the vertical lines handles the vertical and horizontal where are you reading the material from is it the manual

[@Alexander_Sannikov]

i was curious what was the purpose of ethylene glycol in those lenses. surprisingly i could not find a good answer on the internet. so for fun i decided to ask chatgpt and it said it's used as a coolant to transfer heat away from the tube. i guess it makes sense, but it's still not clear to me why it needs to be a liquid. apparently it sometimes becomes contaminated by a fungus.

[@BGTech1]

That’s correct, it is also used because it creates a quality optical coupling between the crts and lens assembly that mitigates luminosity and picture quality losses. crt fungus is a bit of a misnomer, as it has nothing to do with a biological fungus. In some conditions the ethylene glycol will form small crystals suspended in the fluid that will block light and decrease picture quality.

[@BABA-ws5eo]

It does make sense that if you want to cool the light emitting surface of the CRT carrying away the heat with a liquid makes sense. How else would you do it without blocking the picture?

[@Alexander_Sannikov]

@@BABA-ws5eoum.. with glass?

[@GlacialErratic]

great job. I am about to tear down a similar model Sony. I had no idea I'd find some of the things you pointed out.

[@timvottero6313]

Excellent video! I am thinking about parting out my 13 year old Toshiba tn55x81 cinema series hd rear projection TV (which still works, but has not been plugged in for months) to harvest it's front lense and whatever else cool there is to salvage (optical lenses, heat sinks, speakers, casters, etc.) Besides warnings about ethylene glycol within the lense housing, the KZbin videos warn about "discharging" the CRTs and capacitors to avoid a nasty shock. Any advice about this project?

[@BGTech1]

As long as your tv has been sitting for a few days you have nothing to worry about. The charges dissipate as time goes on after you last turned in on. To discharge the crts and flyback, connect a flathead screwdriver to a piece of wire and the other end to the metal chassis. While only Holding onto the plastic screwdriver handle, slide it under the anode caps for each crt and make contact to the metal piece in the center. After that it’s safe to disconnect.

[@slimbruh]

@@BGTech1idk where you heard that but no crts use thousands of volts and hold thats electricity for severals of years

[@BGTech1]

@@slimbruh That’s not correct, you might want to do a little more research.

[@vanderlinde4you]

Still amazing tech from that era.

[@GlutenEruption]

9:00 that’s a mu which is the SI prefix for micro (ie ug for microgram), so micro-processor

[@taran.dhudike7]

Sir this pic tube is recharged

[@EmilioHernandez-iq4qq]

Hola una pregunta yo tengo una de esas se ve muy bien apenas limpie los proyectores y se ve muy clarito pero se ven los colores un poko separados como puedo arreglar

[@BGTech1]

Ésa es una cuestión de convergencia. Es necesario ajustar la convergencia.

[@surindersingh4786]

Thanks a ton bro for this amazing video👋👌👏🙌🙏

[@james_horan]

I saved the CRT lenses from a teardown of my own. What would one use those for? Would they have any sale value?

[@BGTech1]

I haven’t found a use for them yet. A few of them seem like standard magnifying lenses. No, these don’t have resale value.

[@james_horan]

@BGTech1 what about the cathod ray tube with all the wires coming out of it?

[@BGTech1]

@ The only value is pretty much just the scrap copper. Often times you will actually have to pay to have the crt tubes recycled.

[@coondogtheman]

Curious if you can cut out the audio amp section on those white lines and hook it up and have it work.

[@BGTech1]

That’s a neat idea! If the traces of the amp circuitry don’t cross the lines then it’s probably possible. You will still have to figure out the traces that go to other parts of the board for power, low-level input and volume control though.

[@coondogtheman]

@BGTech1 Volume can be wired straight to the left & right line input of the amp IC. That is how most amps work. You are just varying the level of the input. Electronic volume controls do this similarly the audio output chip is just varying the output level of the audio i.e. more output = louder output from the amp. Headphone circuits bypass the main amp and feed audio straight from the audio output chip and not the main amp otherwise you'll blow the headphones. Power you just need to google for a datasheet of the amp and it will tell you the operating voltage range and where the pins are for power, input and output but usually the speakers have a connector.

[@BGTech1]

@coondogtheman Sounds like a cool project. Unfortunately I don’t have these boards anymore.

[@coondogtheman]

@@BGTech1 I've always wanted to strip down one of these TVs but they are hard to find.

[@BGTech1]

@coondogtheman yea, I’ve noticed they aren’t as common as they where 10 years ago when I was a kid. Check Fb marketplace people sometimes post them for free.

[@davidperry4013]

in 2004 50 inch Plasma and CCFL LCD TVs are a thing but, were often times the same price as a 65-inch Sony Bravia A95L after adjusting for inflation. I'd get that 1499-dollar 1080P LCD TV if I were adulting back then and enjoy playing Xbox games in HD as well as enjoying digital cable TV to the fullest potential. Than later own the full trio of 7th gen game systems with Wii for Nintendo games, Playstation for RPG games, and Xbox 360 for FPS games.

[@BGTech1]

Soon you can expect a really nice video on a QLED tv. It’s going to be a new type of video I haven’t done yet. It will be a detailed teardown, but also a documentary style analysis of its architecture and how it works.

[@danman8417]

How long from start to finish ? we have one to dismantle enough to carry to dumpster

[@BGTech1]

You could take it completely apart in less than 30 minutes

[@Glowbuggear]

Awesome video. Can you confirm that the fresnel lens is a spot lens and not linear. Thanks

[@BGTech1]

Yes, it is. It’s made with circular groves and it focuses light to a single point.

[@Glowbuggear]

Thanks!

[@Someguy-t4l]

Hello, i recently disassembled a rear crt projection tv similar to this one, i kept the lenses from the projectors, the frensel lenses and the mirror inside. I was wondering if any of those parts could be toxic or irradiated. It might be a dumb question but those crts produce radiation from x-rays right? If that's so wouldn't that make the other parts slightly radioactive? Is it safe to keep the mirror as a simple wall mirror? Also any advice as to do with the lenses? They seem only good as magnifying glass i tought about making a telescope but they dont seem good enough for that. Thanks for he help

[@BGTech1]

Hi, There is no need to worry about radiation. While CRTs do give off some X-ray radiation when in operation, the radiation isn’t nearly powerful enough to irradiate other nearby objects or people. It is perfectly safe to keep or repurpose parts from the tv. I haven’t found a good use for the tree lens assembly mounted to the CRTs, but they do act a lot like a standard magnifying glass. I believe each assembly has two or possibly more different lens inside which might be interesting for experiments.

[@Someguy-t4l]

@@BGTech1 Thanks for the quick answer, that puts my mind at ease.

[@miknord5493]

I have the speakers only

[@Sonic_The_Electronic_Madlad]

In Czech Republic these are quite rare to see. I was looking for one for a long time until I was going through a scrap yard and found one! All the color guns are working but there is something fucked up in the video circuitry. I'm planning on using the color guns for some kind of project. Maybe a some sort of spot light. It's actually quite amazing how TVs got simple over the years. Anyways, nice video!

[@BGTech1]

Here in the U.S. Rear projection TVs and crt TVs have gotten a lot less common in the last several years.

[@Sonic_The_Electronic_Madlad]

@@BGTech1 Here brand new CRT TVs are being sold purely because of people who cannot afford an LCD TV. However, rear projection TVs are incredibl rare not only in Czech Republic, but also Germany, Poland Slovakia etc. The one that I found was a one-in-a-milion coincidences, it eas imported from the US, hence why it was so rare.

[@BGTech1]

@@Sonic_The_Electronic_Madlad Interesting! Rear projection TVs were the more expensive alternative to crt TVs so they always have been less common that crts. It’s probably been at least 15 years since crt TVs have been sold in stores, Now days you can buy a full HD LCD tv for very cheap. Around 8-10 years ago people were throwing crt TVs out very often. I was 9 or 10 at the time, and I would pull parts from them right on the curb. Back then people didn’t care.

[@DolezalPetr]

these crts are rare, I would buy one

[@RussXDX]

I have a Panasonic 2003 model and it just today started having a blue tint. unfortunately i might have to take it apart.

[@BGTech1]

@RussXDX It might be worth trying to fix it, but there is no clear solution you your probably right. fortunately they are a great source of parts!

[@abysspegasusgaming]

Rear projection TV's are fun to tear apart, but for those looking to tear apart these sets, be careful of the oil that's used inside of the display assembly as it may cause irritation/burning to the skin depending on what kind of oil is used within.

[@worldwidesports5k]

Hello i have a 65 in hitachi rear projection tv, its making a clicking sound and the screen flicks, what do you think the problem could be, i use it to watch football games in the garage thanks.

[@BGTech1]

See if you can find the service manual online. They are very helpful.

[@worldwidesports5k]

@BGTech1 Thanks for the reply but I think I found the problem, I took off the rear panel and dust was everywhere, the motherboard was full of dust, I clean everything up really good and the clicking sound and the flickering screen stopped, it's back to normal. thank you for the reply I really appreciate it thank you.

[@BGTech1]

@worldwidesports5k Glad to help! Sometimes that’s all it takes to get something to work again.

[@taran.dhudike7]

Sir I'm technician. please help me. My projector's red colour poor,, please help me

[@ajazmansuri4151]

Nice vedio

[@Raziel_SSJ]

9:00 *μ* is the unit prefix character in the metric system for "Micro" (10‾⁶) ► _microprocessor_

[@Thestickchannel_OG]

So if mine is dangerous to touch meanwhile is on is because some ground isn't attached well?

[@BGTech1]

The exterior should be fine to touch, even if your ground is not connected well. (I’m assuming you mean the ground connection on the power cord, not something internally)

[@Thestickchannel_OG]

@@BGTech1 no i mean if I touch the connector on the back for the speakers I get shocked

[@Thestickchannel_OG]

Btw do you know why in my tv the soft rubber things with the fluid are swollen?​@@BGTech1

[@BGTech1]

@@Thestickchannel_OG I’m not sure it could be because of a short somewhere. I’ve seen those explanation things swollen too, I guess it just happens over time as it ages.

[@Thestickchannel_OG]

@@BGTech1 so I can't do nothing to prevent the other 2 from exploding?

[@jelaniobamyersel2339]

I have a Sony LCD projection TV model number KF 350 w e610 I am trying to get a picture and I just get static in it. I can play my DVDs on it when I switch it to the channels I just get static

[@riteshpahladsingh3819]

Interesting piece of technology.

[@jacoblovett7560]

How would i turn one of these bulbs into a spotlight

[@BGTech1]

Well, these are not exactly light bulbs, rather they are miniature tv tubes. The lenses that come on them already focus the light somewhat so I’m not sure what you mean by “spotlight”. You could probably have one of these aimed at a wall in a dark room and be able to see the video playing.

[@Scyth3934]

I've always wanted to teardown a rear projection tv

[@BGTech1]

They are pretty fun to take apart. Check fb marketplace people post them for free

[@chrisbailey7384]

Why is the blue one have a clear lens?

[@BGTech1]

It’s for color accuracy. I couldn’t find any information about it on the internet.

[@chrisbailey7384]

@@BGTech1 me either. I would guess the blue one has a blue phosphor wheras the red and green on is the white phosphor.

[@BGTech1]

@@chrisbailey7384 I thought so too, but the phosphors are actually red, green and blue for each of the tubes. My guess is that the red and green isn’t the exact shade required for accuracy reproducing the whole spectrum of colors, and the filters correct the shades. I’m not sure why this isn’t an issue with direct view CRTs though.

[@zsombor_99]

What if you take one of these CRTs and try to connect it to a greyscale television? 🤔

[@efe794]

Ben yeni aldım 100 dolara kötü gösteriyordu içini açtım temizledim Lensleri sildim Şimdi Mükemmel gösteriyor

[@BGTech1]

👍🏻

[@turboterminator7]

Hello i have what appears to be a hair showing on screen what do i do thankyou

[@BGTech1]

Take the front screen panel off and clean off the three lens at the bottom. You could also take them off and clean the lens underneath.

[@gokhankaya1318]

Merhaba.... Sony kdf e50a11e model tv. Ekrandaki göruntüler kirmizi.... ve birazda mavi... Nedeni nedir? acaba yardim edebilirmisiniz tesekkurler.

[@BGTech1]

Kesin nedenden emin değilim. Renk ayarlarında bir sorun var veya yeşil LCD çipi düzgün çalışmıyor.

[@DarkRed-k2c]

How to solve, the projector tv when hot always turns off?

[@BGTech1]

Is it overheating?

[@UserUnknown8570]

very informative video. thanks!

[@shawncalderon4950]

Great job!

[@bennyjoseph9761]

Sir, any possibility to get High volt splitter (or it may be a exstarter)for Lg projection tv model no.PT-53A80..Part no. is 4410Z-A001F.

[@BGTech1]

It looks like you can get one off eBay and some other online sites.

[@عليالعبدالله-س2ي]

What is this fluid inside the three lenses?

[@BGTech1]

It’s Ethylene Glycol

[@EmilioHernandez-iq4qq]

Hola le podré conectar otra bocina a esta tv

[@BGTech1]

Yes it is possible. This tv provides a RCA low-level Audio output. (The rightmost red and white connector on the black panel) Use a RCA audio cable to connect an amplifier and speakers.

[@jeanfrarugama3423]

Super cool thanks for sharing

[@thestreaker4635]

Those tv are bad in bright light so u have to watch it in dark rooms with no light. The picture quality is bad even the crt tv looks better

[@BGTech1]

Yea, that’s one of the reasons why I decided it wasn’t worth keeping.

[@18436Melissa]

Unless if you replace the CRT displays with LCDs and have a 100W LED behind it.

[@hunterm4188]

Lol such a dumbass comment

[@BongLeach]

Can taking a rear projection TV shock you? I stopped dismantling because I don't want to hurt myself any tips anyone? TIA

[@BGTech1]

As long as your tv has been sitting for a few days you have nothing to worry about. The charges dissipate as time goes on after you last turned in on. To discharge the crts and flyback, connect a flathead screwdriver to a piece of wire and the other end to the metal chassis. While only Holding onto the plastic screwdriver handle, slide it under the anode caps for each crt and make contact to the metal piece in the center. After that it’s safe to disconnect.

[@toddteagarden2200]

What does the ethylene glycol do?

[@BGTech1]

It cools the crts and provides a quality optical coupling between the crts and concave lenses.

[@Nerven-z2s]

A TV has given birth to triplets!

[@justinreaves5364]

Where did you find that tv 📺 at?

[@BGTech1]

I got lucky and Someone was throwing it out with the trash. TVs like this are not too common anymore.

[@justinreaves5364]

@@BGTech1 yeah ik what you mean once i was doing door dash and i saw a projector tv just like that next to the trash but i didnt take it 📺

[@sohanjasinghe1]

I saw most of STK ic’s on audio amplifiers

[@BGTech1]

Maybe they are made by the same company

[@JayTheComputerGuy]

I should’ve gotten one I saw for free. My mom even pointed it out and said I could get it

[@BGTech1]

There’s a good chance you’ll see another one. Also look at Facebook marketplace people post rptvs for free all the time

[@topher8634]

That Greek letter means "micro"

[@beaumotplage]

Did you have to destroy it?

[@BGTech1]

It wasn’t working right, and to repair it would have costed more than a new hd lcd.

[@beaumotplage]

@@BGTech1 OK, fair enough if it was faulty :-) . Where possible, I think these rare TVs, or even just their parts, should be preserved as you can often use TVs, or their tubes in old rear- projection arcade machines and they do look great for old games (when tuned-up). Giant 4:3, native 15kHz with no lag and big scanlines is a nice thing.

[@DolezalPetr]

ah yes the greek letter processor

[@prince_cobra]

I believe in advance technology ⚙ Great Sony

[@Dizlaykunsubscribe]

33557я

[@numberones9831]

Primary colours: RED, BLUE and YELLOW.

[@BGTech1]

Red, green, and blue are the primary colors of light, as opposed to pigments, which use the RYB color model. Since TVs work by emitting light, they use the RGB color model.

[@chrisbailey7384]

Red, Yellow and Blue are for mixing paint. The blue paint in the primary color is more azure/light blue towards cyan shade which allows mixing yellow and blue to make green wheras the blue light in the RGB is a very deep royal blue almost indigo shade of blue.

[@josehugobarrerasanchez8350]

Que desperdicio mejor la hubiera VENDIDO.

[@riteshpahladsingh3819]

Interesting piece of technology.