Yes this is a little bit lol huge 🙂 but I have a 30" LCD TV (native 720P & VGA input) with faulty backlit. Everything (lcd, inputs, etc.) works flawlessly, except backlit.
I have tried to repair it via several ways (tinkers, etc.) however I couldn't get it repaired (due to crazy repairing prices, etc.). So it will be going to trash, if I don't use it for a DIY project lol.
Anyway; I need some answers. If anyone can help me, I will be appreciated.
Questions;
1- Can I get reasonable ansi lumen level on the wall (~1000 lumens) without using Fresnel or condenser lens ?
2- Will 400 watt metal halide bulb enough to get ~1000 ansi lumen output ?
3- What type of objective lens could project whole (30") screen ?
4- Do you have any advises to simulate lol Fresnel lens ?
5- Should I use mirror (-s) to get smaller (?) box dimensions ?
6- Can anyone make a box size calculation for this project ?
Thanks in advance. 🙂
PS: Don't worry about box size, because I already ventured freakin' huge box dimensions.
I have tried to repair it via several ways (tinkers, etc.) however I couldn't get it repaired (due to crazy repairing prices, etc.). So it will be going to trash, if I don't use it for a DIY project lol.
Anyway; I need some answers. If anyone can help me, I will be appreciated.
Questions;
1- Can I get reasonable ansi lumen level on the wall (~1000 lumens) without using Fresnel or condenser lens ?
2- Will 400 watt metal halide bulb enough to get ~1000 ansi lumen output ?
3- What type of objective lens could project whole (30") screen ?
4- Do you have any advises to simulate lol Fresnel lens ?
5- Should I use mirror (-s) to get smaller (?) box dimensions ?
6- Can anyone make a box size calculation for this project ?
Thanks in advance. 🙂
PS: Don't worry about box size, because I already ventured freakin' huge box dimensions.
I don't think it's a viable project, you would struggle to find a lens that would project the full 30"
Someone else might know differently though.....
Someone else might know differently though.....
escalade182 said:
I'm excited 🙂, can you give me some specific information or link ?
Edit: I have started a research. But I still need your guidance. 🙂
well i guess it is possable but would be very expensive to get enought light and to get the lcd evenly lit not to mention the focal lense i think finding a lense to project the full 30 inches will be the hardest part ... then evenly lighting the lcd ... i mean from what iv seen peaple are haveing a tough time with a 17 inch lcd let alone a 19 inch ... so youre 30 inch will be interesting.
GOOD LUCKjavascript:smilie('
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GOOD LUCKjavascript:smilie('
')v1d9uy said:well i guess it is possable but would be very expensive to get enought light and to get the lcd evenly lit not to mention the focal lense i think finding a lense to project the full 30 inches will be the hardest part ... then evenly lighting the lcd ... i mean from what iv seen peaple are haveing a tough time with a 17 inch lcd let alone a 19 inch ... so youre 30 inch will be interesting.
GOOD LUCKjavascript:smilie('
As I mentioned (?) 'this is just an idea'. I mean I'm doing a basis research, so if it's not reasonable as monetary (lol), and if it's not -really- reasonable, I would not be starting this project. I'm just pinning down.
well there is alot of smart peaple on here im sure theyll point you in the right direction .. or have ideas for you im not sure on this but im assuming if you got a 1000 watt metal halide bulb u might even get a decent ansi without useing a fresnle but im not sure how evenly it will light the lcd
4real. Shoot, send it to me instead. I'll fix the heck out of it and stick it in my living room. I very seriously doubt you will be able to find optics for a screen that size.
my Sharp XG-e1200u's LCD is 1.5" diagonaly....why the hell would anyone need a 30"? seriously. the resolution probably isnt as good as my 1.5" 🙄
in all honesty, fix it. dont tear it apart. If you cant fix it, ill buy it from you for $30 and fix it myself. (even though its worth around $400 used)
in all honesty, fix it. dont tear it apart. If you cant fix it, ill buy it from you for $30 and fix it myself.
(even though its worth around $400 used)Guys thanks for friendly advises, but you guys are missing out something or you didn't read over my posts. I mean I don't live in USA 🙂 , I live in near the Middle East (yes I didn't mention my living place but I mentioned that I'm on one-way street lol) .
And no one fixes this backlit issue (due to rusticity). They say "We must change its motherboard , we can't fix this issue because this is very new technology lol..." , and you know it costs freakin' expensive. As I said; "it will be going to trash if I don't use in a DIY project". Isn't it clear ?
Besides I could not send this huge think to USA or somewhere lol.
And no one fixes this backlit issue (due to rusticity). They say "We must change its motherboard , we can't fix this issue because this is very new technology lol..." , and you know it costs freakin' expensive. As I said; "it will be going to trash if I don't use in a DIY project". Isn't it clear ?
Besides I could not send this huge think to USA or somewhere lol.
escalade182 said:
HouseMachine said:
@Escalade; my 30" one has mid level HDTV native resolution (720P=1280x720 pixels) , and 16.7m / 16 ms panel. 😉
Stocker said:
If you know about fixing backlit issues please enlighten me. I assume it's inverter board. As you know Stocker; I also tried to run flourescent tubes via external inverter with 12V adapter. And I get half success. Can you help me if I post the picture of motherboard and inverter board ?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=67043
Wow 30". To tell you the truth, just the projection lens would cost more than the original LCD; easily in the thousands.
One option you could research is finding a 30" (or bigger) fresnel lens. I've seen 48" fresnels before. Use this as the "back" fresnel (put is behind your stripped LCD). Then use a low wattage bulb (50W maybe?) and place the bulb at the focal length of the fresnel lens. Place a reflector behind the bulb. This will give you a backlight so you can watch the LCD like it was originally before the backlight died.
One option you could research is finding a 30" (or bigger) fresnel lens. I've seen 48" fresnels before. Use this as the "back" fresnel (put is behind your stripped LCD). Then use a low wattage bulb (50W maybe?) and place the bulb at the focal length of the fresnel lens. Place a reflector behind the bulb. This will give you a backlight so you can watch the LCD like it was originally before the backlight died.
An externally hosted image should be here but it was not working when we last tested it.
Thanks Superdavuemo for the idea. Actually I also thought about realizing this idea; I mean making my own backlit unit. One year ago, there was a tv magnifier (huge pvc Fresnels) seller in my country, and its prices were quite cheap (~100$ for 40" pvc Fresnel). However the firm is not existing anymore. Lastly I will be trying to make my own fresnel lens using glass cutter 🙂. I mean I'm in very desperate situation (I think it's time to watch Desperate Housewives lol).
It might even be possible to use two 400mm x 400mm fresnel lenses (assuming the 30" screen is widescreen 16:9) with two light sources. It would take some adjusting but because you are only spreading light, you might be able to get a nice even distribution.
I did not realize that this was the same panel as in the other thread.
If the fluorescent bulbs work at all, the likely source of the trouble is in the inverter, as you were mentioning in that other thread. I think the reason that you were getting half-brightness from the new inverters was that they could not deliver what the lamps wanted.
Lamps long enough to run the width of a 30" TV will want something in the range of 800-2000Volts I think, depending on diameter. Inverters designed for a 10 or 12" lamp might give you only 300-500V or less. Not to mention that the current will be likely less also. Try to obtain a CCFL inverter designed for use with the size lamps you have and see if that gets the brightness up.
OR get a few sheets of translucent material and a couple small fluorescent desk lamp -sized light fixtures. like some of the fluorescent fixtures here
and make a light-box behind the panel, and use it like a regular-sized 30inch CRT display.
If the fluorescent bulbs work at all, the likely source of the trouble is in the inverter, as you were mentioning in that other thread. I think the reason that you were getting half-brightness from the new inverters was that they could not deliver what the lamps wanted.
Lamps long enough to run the width of a 30" TV will want something in the range of 800-2000Volts I think, depending on diameter. Inverters designed for a 10 or 12" lamp might give you only 300-500V or less. Not to mention that the current will be likely less also. Try to obtain a CCFL inverter designed for use with the size lamps you have and see if that gets the brightness up.
OR get a few sheets of translucent material and a couple small fluorescent desk lamp -sized light fixtures. like some of the fluorescent fixtures here
and make a light-box behind the panel, and use it like a regular-sized 30inch CRT display.
Here is an inverter for a 24" ccfl. I don't know if will help you, but it will have higher voltage than those designed for 12" tubes.
edit:
I just saw from your other thread that the display has an array of 8 lamps. If you can find any info on that 8 lamp inverter you linked, I'm sure we can help you find a replacement.
edit:
I just saw from your other thread that the display has an array of 8 lamps. If you can find any info on that 8 lamp inverter you linked, I'm sure we can help you find a replacement.
fresnel
Their is a guy on ebay that sells a 48 x 48 fresnel for $80 or so
Two would give you a start of a PJ but you would still need a realy big triplet. A 1500 watt MH lamp and a home made triplet and you would have a 6 foot long PJ! Do you have a realy large house?
The cheep fix would be to get two backlights from some of the people that have scraped theirs from the LCD's and adapt them to fit.
good luck Dave
Their is a guy on ebay that sells a 48 x 48 fresnel for $80 or so
Two would give you a start of a PJ but you would still need a realy big triplet. A 1500 watt MH lamp and a home made triplet and you would have a 6 foot long PJ! Do you have a realy large house?
The cheep fix would be to get two backlights from some of the people that have scraped theirs from the LCD's and adapt them to fit.
good luck Dave
Thx guys so much for links, and ideas. I think I will try to find those inverters in my place, that you've pointed out. I mean; I will be trying to restore its backlit again.
PS: Overd0se I couldn't reach any technical document on their site. If I could get some information, I will email you. Thx 🙂.
PS: Overd0se I couldn't reach any technical document on their site. If I could get some information, I will email you. Thx 🙂.
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