I am posting here for advice. I have been having trouble with my Optoma HD70 for quite some time now. The unit will work fine for a seemingly random period of time (sometimes only 10 minutes, sometimes an hour or more), and then it will crap out.
When I say crap out, the picture will flicker in color. The flickering will get faster, then the unit will shut down altogether (usually associated with a high pitched whine). After shutdown, the error light will flash orange. I have to then unplug the unit, plug it back in, and power it back up. The symptoms will usually repeat after that.
I am almost certain this problem is temperature related. The reason I believe this is: these symptoms were persistent a few months ago. Then, based on advice I found on google, I set the HD70 to "high altitude mode," which is just a high fan mode, and it worked PERFECTLY for a month and a half or so. Now, the symptoms are back.
So, I have a few theories:
1. The fan is "bad." As in, not moving enough air... The fan does not sound funny at all, so I am doubting this...
2. Dirty: not likely, as I took it apart and blew the dust out of it twice since November.
3. Poor positioning: possible. The unit is very near a wall (behind it), and a bulkhead that's in place for an air duct... this may be an issue.
4. Old bulb?
This one I hope you guys can answer for me... the bulb is well over the recommended 2000 hours... somewhere around 2700 I think. Do old bulbs overheat? I had planned to simply use this bulb until it absolutely no longer functioned. However, if a bulb replacement will fix this, I will purchase one now.
5. INSERT THEORY HERE THAT I CANNOT THINK OF!!
I set up an experiment to test these possibilities. I have a multimeter with a temp probe. The probe is stuck just inside one of the exhaust vents in the HD70, recording the temp of the exhaust air. I will, for a few weeks, record the temperature of that air when the unit either: 1. Flickers or 2. Fails.
See picture below for my setup.
I will also try other methods of cooling, such as very low room temp, and adding an external fan...
Again, I appreciate any theories/advice you guys can deliver! Thank you!
, on Flickr[/IMG]