Hi, strange problem I have built my PJ and it is functioning at a maximum temperature (sensor on lcd screen) of 95.3 degrees. i know this is rather warmer than most but I cannot get it any lower. The triuble I am having is that the rear fresnel is bent, buckled and well and truly out of shape, I can only put this down to heat. I have the requisite tempered glass. however I have put this about one inch away from the fresnel, should it be closer? I can see no recommendation for the distance between the 2. The temperature at the rear fresnel is 90 degrees.
Any help gratefully received.

Have you tried attaching the fres lens to the temp glass?

Wait! Did you just say the temp is lower at the rear fres than it is at the lcd?

Alot of people attach the glass or lexan to the rear fresnal to keep it from bowing. Mine has also bowed a bit. I am building a new PJ and will attach my lexan to it to help keep it from bowing becuase this can cause uneven lighting.

If your sensor is actualy touching a surface (lcd, fresnal, temp. glass) the reading will be significantly higher than expected. Unless I'm wrong, you should be reading the temperature of the air passing accross the lcd and not the surface of the monitor itself.

A few questions...

Is your air intake slot of standard width?
Are you using an air filter?
What type of fan are you using, and how much air does it move?
Does your rear fres. just hang in space or is it attatched to some sort of backing material like glass or lexan?

but isn't the temperature of the actual lcd itself what is important? I know most people measure the air temp, but it seems to me the actual panel temp is what would be important...

Probably. But everyone here seems to be getting along just fine reading the air temperature.

I read my temp at the bottom of my panel, my temp stays about 10 degrees above room temp with one 120mm fan. do you have any pics of your set up? are you pulling cool air in and across your panel? do you have a big enough space under your safety glass? which fan are you using? is it blowing hot air OUT of your pj? is it sucking cool air IN? are there any air leaks? I have my rear fresnel "sandwiched" between my safety glass and the frame that holds it, it bows ever so slightly but that is because it touches the glass. in my new version case the fresnel is framed and is 5mm in front of the lexan. the panel is 15mm in front of that and this is where I draw cool air in between the panel and fresnel. what type of filter are you using? I use a fine mesh almost like fine curtain material. I have to clean it once a month when I notice the temp going 15 degrees above room temp. I probably use PJ1 every night for at least 4/6 hours. once it gets to normal operating temps it stays there.

Hi to respond to your questions.

The PJ is built to the standard guide sizes, I am using the fan (evercool) supplied by lumenlabs, The air intake is the standeard size. The gap under the safety glass is just over 3/4 inch. I DO NOT have an air filter, why would this make a diference? I did a small leak test with a modified smoke pellet which indicated that there were no leaks foward of the lcd.

Shivers20 yes the temperature is cooler at the rear fresnel than the lcd.

I have just noticed that the lid of my projector has a slight bow in it which maybe accounts for a maximum 5mm gap at the centre of the lid over the safety glass.

I have moved my safety glass up towards my fresnel, this has taken out the bow a little but not reduced the temperature.

My son is away with the camera for another 2 days, I will post some pictures on Friday. Many thanks for your replies.

An air filter will restrict air flow and cause your pj to run a little hotter.

As for that gap. We need to observe a strict air circuit in our projectors to keep them cool. Try to patch up that gap and if you still have a problem ther are plenty of other measures to try.

Oh another question... How is your fan positioned on the projector? Mine for example (I've got two evercools) are located on the back of the box toward the top blowing down.

okay will try to fill the gap,

My fan is positioned about 3/4 of the way down the box also blowing down.