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#701 |
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diyAudio Member
Join Date: Jan 2004
Location: manila
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just use a smaller arc bulb like HSD and you will be happy with the results. For me, Its the key to a high quality image. If you are still using HQI bulb or those other big bulbs, then you are missing alot.
I uses the ballast that i used for 250w hqi-tsd. Each lcd has different transmissiveness and each lcd controller is different also that can impact brightness and image quality w/c you know already . My general impression on the lcd. The best lcd to use based from my limited experiences are LG- excellent colors and brightness. Higher color accuracy. AUO ( Benq monitor ) - 262k colors only but image is very sharp and the brightest among my three preferred panel Samsung-very good colors and bright also. toshiba and sanyo - not my preference. I have hotspot, or bulb arc showing at the center at the image using LG lcd before, problem has gotten worst when i changed from HQI to HSD bulb. Based from local builders expereinces, not all LG models have this problem. Anyway, i thought that it has something to do with LCD polarizer also. Samsung 15inch lcd used by local builders doesnt have this problem using identical set of parts as I use. I am inclined also to believe that it is caused by the imperfection in the grooves at the center of bottom fresnel. I got so many fresnel with different defects at the center. And each kind of defect will show different annoyance at the center of projected image ( smal to big brown spot, rings, halo, veins like appearance and bulb arc showing at the center) I had eliminated hot spot using different technique. 1. Change the fresnel - you can tell which fresnel has problem by putting it under the light . Observe the hotspot. Different fresnel or production batch , or from different supplier will show from bright hotspot or non at all. 2. Move the bottom fresenel to the lcd closer- This did it for me It totally eliminated the hotspot. I got 3/8 inch distance form lcd to bottom fresenel. But this could be a serious concern in cooling if you are using 400 watts bulb. When i was using 250w HQI-TSd, the problem is subtle. So alittle under voltage using voltage regulator did it. The problem is subtle maybe because the bulb arc is a lot bigger. The brightness per unit length of the bulb arc is lower compared tomuch smaller arc bulb. I hope my solution works for you also. |
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#702 |
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diyAudio Member
Join Date: Jan 2004
Location: manila
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My current 1920x1200 LG projector has the same hotspot problem. Hotspot was eliminated by moving the bottom fresnel close to lcd,
Pics of current Filipino's pride,The new singing sensation Charice Pempengco , back-up by the very popular Oprah and David Foster. Using my HD projector and dvd player at 1400x900 resolution you tube movie file
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#703 |
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diyAudio Member
Join Date: Jul 2007
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Thanks Hertz! thats exactly what I wanted to know.
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DIY projector enclosures for sale www.DIYProjectorKits.com Plans, parts, kits. |
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#704 |
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diyAudio Member
Join Date: Sep 2007
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Hello Kababayans! Simple question.... Is it possible to replace only the bulb excluding the box module? I have a 130w lamp with only a rating of 1000hrs. Replacement of the module will cost me $400(for 1000 hrs!#*&5%!) and worst the unit has been discontinued. If so what about the availability here in RP. This is a Plus Piano hometheater dlp projector that I use in a dedicated HTdark room. 500 lumens only but the video is almost filmlike on a 100" screen. I hate to let it go. Any comments and suggestions is highly appreciable. Thanks guys!
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#705 |
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diyAudio Member
Join Date: Jul 2005
Location: East Bay CALIFORNIA
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How's our mother land bro....GODSPEED to you all.
I would like to get onboard on this but my concern is the image quality vs a HD 1080p LCD TV. I am pretty sure you have investigated on this and would like to know your 2cents. Please advice. Praying hard here due to the sufferring of our fellow kababayans... Thank you, Edwin |
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