Hello all, well I got my 20 dollar OHP in the other day from ebay. It was going to be just a piece of crap tester, but once I received it I saw it had been retrofit with a 1000w Halogen bulb and ballast. Condensor lens and reflector installed. So this should be a piece of cake to retrofit with MH, we shall see. My question is, the glass on the top of the OHP (The part the LCD Panel sits on) is pretty scratched up, and has one big scratch you can see on the screen fairly well. Is this any kind of special glass that retracts heat or anything? If not, I will just go get a piece of glass cut to fit in place of it the bad one.
Thanks for any advice and/or tips.
Thanks for any advice and/or tips.
Remove the glass.. and put nothing!
The bottom of the lcd produce heat when the light hit the polarizer, with a glass under it, you trap the heat there.
The bottom of the lcd produce heat when the light hit the polarizer, with a glass under it, you trap the heat there.
hmm
I am not sure I follow. So you are saying just remove the glass on the top all together? And just have my LCD Panel sit on the open frame? In other words, I would have, Bulb, Condensor lens, Glass Fresnal, LCD Panel. Correct?
Thanks for the taking the time to help me out.
I am not sure I follow. So you are saying just remove the glass on the top all together? And just have my LCD Panel sit on the open frame? In other words, I would have, Bulb, Condensor lens, Glass Fresnal, LCD Panel. Correct?
Thanks for the taking the time to help me out.
Re: hmm
Yeah that what I mean. Reflector, lamp, condenser lens, fresnel lens, lcd, fresnel lens ( I case of a split fresnel ), projection lens.
That's the way I did it, and cruser too did it that way.
This way I get way less heat than with the glass. Why? because this way I can blow air on the bottom of the LCD, what couldn't be achived with the lcd on the stage glass.
So to resume, without the glass, I can blow air on both top and bottom of the lcd, with glass, only the top.
ArcadEd said:
Yeah that what I mean. Reflector, lamp, condenser lens, fresnel lens, lcd, fresnel lens ( I case of a split fresnel ), projection lens.
That's the way I did it, and cruser too did it that way.
This way I get way less heat than with the glass. Why? because this way I can blow air on the bottom of the LCD, what couldn't be achived with the lcd on the stage glass.
So to resume, without the glass, I can blow air on both top and bottom of the lcd, with glass, only the top.
Fans
So do you have a fan inside the OHP that blows air from underneath onto the bottom of the LCD? That is a very intersting idea, and I think that is first I have heard of it. Do you have any pictures of your current setup, I would love to get a visual of what exactly you are saying.
What about the issue that ND discusses, about the blockage of UV heat? Remember, I am using a LCD projection panel and not an LCD Display.
Thanks again.
So do you have a fan inside the OHP that blows air from underneath onto the bottom of the LCD? That is a very intersting idea, and I think that is first I have heard of it. Do you have any pictures of your current setup, I would love to get a visual of what exactly you are saying.
What about the issue that ND discusses, about the blockage of UV heat? Remember, I am using a LCD projection panel and not an LCD Display.
Thanks again.
a good idea for LCD monitors but maybe not so with panels.My panel has an internal fan blowing air around thw whole LCD ans the the glasses in fron and back the the lcd keep the air from leaving 🙂
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