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Old 3rd July 2011, 03:14 AM   #21
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Hii jayadev

I have decided to go your way as far as lcd is concerned for the reason that I want HDMI to intigrate the projection with my AVR. Will need your guidence in stripping the lcd. may i please have the specs of lcd and its dimensions so that i m able to decide upon the size of fresnels. What stage is ur PJ in. would like to see it in action. looking forward to see pics as realistic as possible...may be a nice video if possible.
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Old 3rd July 2011, 03:41 AM   #22
jayadev is offline jayadev  India
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dennymushtang , no worries i will post everything you ask.!!
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Old 5th July 2011, 09:17 PM   #23
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hey jayadev so how did you deal with all that heat from the 400w mh bulb? it was causing black spots on lcd earlier right?

can you list cooling specs. my main concern is the cooling for the lamp. thnks so much.
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Old 7th July 2011, 01:14 PM   #24
jayadev is offline jayadev  India
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heat has been well controlled.by 05 numbers of fan from old PC.
that much was not required though but those fans were laying useless since a long time so i just found it for a better use.

one fan on top blows over the lamp to fresnel and rest of the fan pull air behind the lamp.

fresnel remain bit warm now but lcd stays cool even after 4 hours of movie.

the black spot was caused due to the weirdest reasons and that is due to the reflector behind the lamp.
the reflector was concentrating the light to fresnel and fresnel was focusing it to a very narrow area making the light and heat intense on the LCD .
the solution -the reflector was removed. reflector wont help much in my setup as the lcd is too big or may be some other exotic kind of focal would be required to spread the light from lamp evenly on lcd.
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Old 7th July 2011, 05:41 PM   #25
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so two 4 inch 12v fans and one 5inch 230v fan are enough?

and which reflector did you use that caused you problems?

i was going to use car headlight reflector is that ok?
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Old 8th July 2011, 03:15 PM   #26
jayadev is offline jayadev  India
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Quote:
so two 4 inch 12v fans and one 5inch 230v fan are enough?
that would be more than sufficient. i am using four 4 inch and a five inch. i got 2 6inch also but it was not needed.

i used car headlight reflector (round ambassador car )and that was a villain.
the reason is the too much of overall focal length of converged light. so one has to be carefull choosing reflector. it acts like an undesired lens in front of lamp and lcd.

Last edited by jayadev; 8th July 2011 at 03:18 PM.
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Old 8th July 2011, 04:44 PM   #27
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so that industrial type reflector that you have posted in your first post the one you used?

the one you have posted photo of
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Old 10th July 2011, 02:39 AM   #28
jayadev is offline jayadev  India
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Quote:
the one you have posted photo of
had been removed. now my projector consist no reflector as long as i dont get right one.
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Old 10th July 2011, 01:15 PM   #29
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so which is the ideal reflector? just a half cylinder of reflecting material or small plastic reflector or what exactly?

im about to start my build as i have assembled all the equipment. just this last part remains.

thanks for your help.
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Old 10th July 2011, 09:05 PM   #30
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hiii guys.....one doubt. how would u control the light coming out of so many holes...that is to cater for 5 fans. I suppose even the light spilling out of one hole will be unbearable. Wont it spoil the show in a dark room?????

@ jayadev
Plz post some pictures of ur projector in action...preferably a comparision of HD and non HD content.
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