Instructables

Salvaging the Fresnel Lens from a Rear Projection TV

video Salvaging the Fresnel Lens from a Rear Projection TV

I was thinking of DrSimons awesome instructable the other day when i spotted a discarded TV on the road side.  
Since it was garbage day, and my wife stated in no uncertain terms that it had to go "that day", I decided to make a quick video on how to get the screen out. I also salvaged a nice first surface mirror form the cabinet for a never to be made future laser instructable.

So enjoy this brief video of me looking disheveled and fat as I rush to disassemble the TV before the garbage truck comes.


amarzian16 days ago

I just salvaged one from out front Some guy came down our street and dumped it off in front of our house. I wonder if any use can be made with the three lenses?

agoldsmith111 months ago
Would a 15-20 inch fresnel lens be effective for a cardboard solar oven? (painted black, insulated, etc.)
I can't believe it... I had the chance to salvage a huge one, I mean like the double of the one of the video! If I only had known at the time... agh! Imagine how powerful it could have been...
Okay, I've been waiting a while to find a projection TV and I finally found one in another state (we were giving two horses back and picking up mine) and someone had already taken the screens out of it, but luckily had left the one I need (I hope, it was kinda hard to test it when it was getting dark so I'm not 100% sure yet)

Anyways, we had to haul it back in the back of the horse trailer and it had fallen over (thought it was secure) onto fine pine shavings and a bit of horse poop (ew and will be washed) and I was wondering if scratches could hinder the screen very much. It was pitch black when we finally made it home and I couldn't see to check for scratches.
rgilliam1 year ago
I was watching someone making a cooker out of this; I had an idea of makeing a cement water storage & placing this on top for a solor water heater.
d1ndian1 year ago
Can you try to use the fresnel lens to make a DIY projecter that can be hooked to a portable dvd player?
ssmith23 years ago
Thanks for the video! I just picked up a 62" DLP TV for free on craigslist last night for this reason and my power drill just finished charging! Time to get myself some quality free parts for my tesla turbine ORC project ;)

If you all want to know what I'm up to check it out at teslapower.wordpress.com
Thanks for this, and very nice link. I demand your future laser instructable!

So what are you planning with the lens?
kricketone3 years ago
I made a cooker out of one of these, I can turn a hot dog into a black lump in one min we checked the temp on mine at 3000 degrees on a bright day.
rimar20003 years ago
TUA, with that front surface mirror you can make a 3D mirror array for photograph.
Oroka3 years ago
Awwww, I just threw out a 50" DLP TV last month too!
Our community has an electronic drop off where I usually use a pry bar or the lug nut wrench from my trunk to recover fresnel lenses. It´s quick and dirty, but the plastic housing usually gives way pretty quick.
EmmettO3 years ago
I really want to find one of these. I had a chance to get a broken rear projection tv a while ago but couldn't find the time to pick it up. Frustrating!
Tool Using Animal (author)  EmmettO3 years ago
Now's the time of year, with HDTV's as cheap as they are, people are upgrading, just cruise the neighborhood on garbage night.