A friend brought the majority of an old Toshiba 42PW23P rear projection television around so that we could tear it down and salvage components from it... and that's exactly what we did.
When I was a kid, my parents decided to get one of these for Christmas in 2002 instead of buying us all presents. Many hours of N64, GameCube, PS2 racked up on it, at times forgot to pause even - not a single burn in issue. I think it is still running at my Mum's Boyfriend's house, it sits in his living room! Not bad!
Had no idea that the phosphors were different colors, thought it was all filtering. Makes sense though from an efficiency standpoint. Great fun to watch, thanks !!
Thanks robstorms - I'd never seen a red phosphor CRT before, which is why I was expecting white with a colour filter in there. Now that everything has gone digital, I find it amazing what they used to achieve with analog electronics and some clever physics/optics. The cumulative amount of science which made that TV set work, with electron beams, magnetic fields, phosphors, lenses, infrared controllers and little microprocessors is quite amazing when you think about it. Cheers!!
Jim Conner A lot of the Scopes had red Phosphor Jim, apparently finding a decent red phosphor was the kick in the pants for colour TV no one could be bothered before because the colour would of sucked !!
101blog That's a very good point... I'd seen green-screen monitors, cyan oscilloscopes and amber terminals.. but I'd never seen a red one... I guess they stopped making all of the mono-colour displays when they worked out how to do full-colour... which would have been when they sorted out the red phosphor... D'oh... I should have realised that every colour telly had red phosphor dots on the screen... Thanks for pointing that out.. Cheers!!
Hi @diamond4829 - I never found any mirror assembly in there. It was three high brightness CRTs with projection lenses in front of them. (I've still got the projector lenses stored in my garage as they are cool bits of kit - You can project your smartphone onto a wall :-). I'm not sure where a mirror assembly would come into play with this type of telly. Cheers!!
I'm trying to repair the convergence chips on one of these boards and I couldn't figure out how to separate those connectors at 18:02. Ended up watching the entire video for it and also learnt a great deal about the workings of the tv. Thanks!
Thanks for watching asuspower ... I fond pulling that set to pieces very interesting too - Until it arrived I was expecting to be pulling apart a more modern DLP/LCD based system, so it was an unexpected surprise to see all the analog electronics in there. Hope you're having a great weekend. Cheers!!
FesterWerks - Hi Mark. I lenses were the highest up on the to-keep list... I'm going to have some fun playing around with them... For starters I'm going to have to see what happens when I focus the sun through them :)... Hope you're having a good weekend - it's greenhouse time for me. Cheers!!
Up until yesterday I even had an ant problem going on in my greenhouse which could have been a great testing ground.... but I used Pyrethum to poison them, rather than cooking them with the power of the sun... Somehow it seemed more humane, but I can't really say I'd fancy either death myself. Cheers!!
Hi +lorefolk Lisseerk - My friend left the fresnel lenses at his brother's house when he collected the TV... He's promised to bring them over for me to play with some time in the future. Cheers!!
Hello! I have an old Toshiba 50'' CRT rear projection TV (2004). Unfortunately it's faulty since last August. Will I have to teardown it too? :( :( :( The system board is like yours :o
What's the fault? Teardowns are a lot of fun for end-of-life equipment, but I'm all in favour of fixing thigns if at all possible. I might still have some spares that I kept from the set I tore down.
@@ThingsWhichArentWork I like to try to fix things too. The problems started while I was watching a movie. The image became dark and blurry/distorted on the left side. I have a picture of the defect: ibb.co/FmdhKZ5 . Thank you.
That's an interesting one. My best guess would be that the deflection coils that are used to steer the electron beam aren't getting enough voltage to steer the beam to the edges of the screen. It would either be that, or the high voltage supply that is responsible for accellerating the electrons towards the front of the screen. Either fault could cause the same effect that you're seeing with the colours misaligned and blurry. I've no idea how to go about fixing either issue I'm afraid.
@@ThingsWhichArentWork Thank you very much for the answer. I really appreciate your considerations. Someone told me about possible IC problems, but your answer makes more sense. ;)
Hi +Slot1Gamer - It can't be biological growth because the inside of the gun contains a vacuum so nothing alive could grow in there.... I do remember though that old CRT guns could grow short circuits between connections... something about the metal atoms being attracted to each other due to the high voltages and building little metal tendrils out from the surface of the conductors... They used to have a 'repair' technique where they'd just apply enough current to burn out the short, thereby restoring the tube back to working order... I think that must be the growth you're thinking of... Cheers!!
Jim Conner From what I've read it's a kind of fungus or something. I've had it happen to one of my old sets. It makes the image blurry, yes the tube is under vacuum but is the lens and fluid?
+Slot1Gamer Thanks for that link - I hadn't heard of that particular problem, but it makes perfect sense... I've heard of people's water cooled PCs getting algae growth inside when they've just added glycol and not any kind of fungicide into their cooling mixture - the glycol will act as a food source for the bacteria/fungus to grow. Hope you're having a good weekend. Cheers!!
Hi again +Slot1Gamer - I was hopeful that you'd nailed it, but puzzled as to how it could work without some kind of sensor to read back the projected image... after checking the owners manual, I found that this TV never had an auto convergence feature, so unfortunately the metal bar is still a mystery. It doesn't seem to effect the projected image at all when the lenses are in place - I think the lens focuses the image off to the side of that bar... perhaps the bar is cropping one edge off the red image... but why would the want to do that?...I still can't figure it out... Cheers!!
+Green Pretzel Of all the bits I salvaged from that TV, I reckon the speakers will turn out to be the most useful parts... It's rather a shame that they don't make 'em like they used to... Cheers!!
