My projector is a toshiba TLP-T521 and I want to convert it the a led light source.
I have sourced all the parts and i'm still waiting for some to arrive, I will update this with the new steps once I receive the parts.
So far I have managed to bypass the bulb check and run my LED with a boost converter but it had problems. The image was to dim and the LED was flickering.
Step 1: Prologue
For anyone who just wants to see the project skip this step as it will just be a bit of history ;)
I'm currently 15, when I started this project I was about 12 or 13.
I had wanted a projector for a while but could not afford a new one for a few hundred, I needed one under a 100 euros. It was one of my first times buying online. I went on ebay and searched for a few weeks finding lots with blown bulbs for very cheap prices but bulbs were expensive so I wanted a working one!
I finally found one marked as working with a bulb for around 60€ so I bought it.
After a long wait for me, being excited to finally be getting a projector it finally arrived and was soon in my bedroom. I turned it on and it had a great image! (one I still remember and want to achieve in the instructsble). But disaster soon struck, 60€ was too good to be true, after a few hours of YouTube videos later the bulb light came on and the projector off!
I let it cool down and turned it back on, it lasted another 10min before that red light of doom came on again. arrrh!
It was bulb searching time, I went online and found the bulb for around 100€, too much for me, at 12 I would have been spending all of my money on a light bulb, it seemed like madness!
I thought to myself: "It's just a light bulb, why can't I use any old one?"
So back online again! I found a few people who had done it but there were no tutorials for my model so I followed the general rule of connecting the 3.3v to ground to bypass the lamp check and it worked! success!
Now I needed a bulb, I didn't know about high powered leds back then and so this is where the project got stuck. I tried car headlamps, overhead spotlights and some others but they were never bright enough. Also I had a lot of trouble mounting them not having a drill or glue gun.
So now we arrive today, the projector sat in a box under my bed for years and I never touched it until a few months ago. I researched again and found out about high powered leds. Well let's hope it works this time!
Step 2: Bypassing the Bulb Check
Step 3: LED
First I mounted the led on an old computer heatsink (with fan). I then connected the fan wires the one of the projectors fans in parallel. I then set the boost converter to 32v, connected the led and then a 12v pc psu to power it all.
But here's the problem: I don't know if using a non current regulated supply damaged the led or if it's normal but at above 30v the led starts the flicker between bright and dim. I have tried different boost converters and 12v sources but it's always the same. The leds current draw is continuously varying!
I have now ordered a 100w led driver and a new led.
Step 4: Tests
Keep in mind that this really was a pitch dark room and that it was a big projection. And I think it might now be even dimmer than when I took this photo :/
Step 5: Preparing for My Led Driver.
Finally I have fitted a relay so that the projector can control the led just like the old lamp. I found a wire going to the ballast that was 4.5v when the lamp should be on and 0v when off.
I used one designed for micro controllers like in the photo but the single version. I connected 4.5v to signal or in, ground to ground and +5v to the IR receiver 5v pin (you can use any 5v pin I just used that one for convenience).
Step 6: After Thoughts
I will update this once I have fitted in the new stuff and post results. I might even make a video demonstrating it! Who knows!
Edit: I got everything working how I wanted a while ago but didn't update this because the light output is still weaker than I would have liked... I have tried various methods to direct the beam (Reflector's, Fresnel lenses...) but nothing improves the light output! The projector is fully usable as normal but not as bright!
I still haven't made a video but I might do soon. I am also working on a 3d printer so I might make an instructable on that to! Who knows!