diy projector from the Philippines

[hertzblaster]

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.

[hertzblaster]

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

[TESCORP]

Thanks Hertz! thats exactly what I wanted to know.

[dolbythx]

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!

[doggie750]

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