Hello
The Optoma HD20P doesn't have an air filter.
If you remove the covers you will find 2 cooling fans that get a build up of dust on the leading edges of the fan blades.
These can easily be cleaned with a small paint brush and a drinking straw to blow out the excess dust.
If you are having overheating problems, please view my post on replacing the heat sink compound on the image processor.
Cheers
SOURCE: OPTOMA EP716
ALSO CHECK YOUR FAN. IF THE FAN OR A HEAT SINK IS NOT WORKING PROPERLY (I.E. THE FAN MAY JUST NEED TO BE CLEANED OR REPLACED, THERE SHOULD BE A SMALL HEAT SINK. IF CLOUDED W/DUST, IT WILL KEEP THE OPERATION SHORT). ALSO CHECK IF YOU HAVE SET ANY TEMPERATURE SHUTDOWN PARAMETERS. IF YOUR LAMP HEATS UP FOR SO LONG AND REACHES A TEMPERATURE THAT WILL AFFECT THE CIRCUITS, THIS OF COURSE WILL SHUT DOWN YOUR UNIT UNEXPECTEDLY. HOPE THIS HELPS...JGUAM
SOURCE: Optoma DLP EP719
Try this:
There is a stuffed 10v 3300uf capacitor on the power board. You need to replace it.
Bellow you can check in the picture where the capacitor is located.
Notice that in this picture I have already took the bad capacitor out and replaced with two small cords to reach the bottom and test the new capacitor.
To reach this place is not fast, several layers of plastic and metal must be removed, but is not a hard task to take the capacitor out and replace it for another.
It works just great! Now it is back on track with awesome image.
SOURCE: How to connect the Optoma Pico PK-101 DLP to a laptop
You have to buy a 17€ converter.... here on my website, is a diagramm on the B chapter that explain a lot.
http://shadar.spacequadrat.de/?p=121#more-121
Here is the link to buy one converter
http://shop.ebay.fr/i.html?_nkw=pc+VGA+to+converter&_sacat=0&defsort=15&LH_BIN=1&_sop=15&_odkw=pc+to+converter&_osacat=0&bkBtn=&LH_ClassifyToggle=0&_trksid=p3286.m270.l1313
SOURCE: I just got a new
Hi miracles4all: I solved HDMI signal issue in my Optoma HD20. In my case it was the lack of contact between the HDMI cable plug male ending and the Optoma HD20 HDMI female port. My 35ft cable plug male HDMI ending was not completely "seating" in the Optoma HD20 HDMI female port. I solved the problem by purchasing a HDMI female to female coupler and adding a 3ft HDMI cable that had a slim male ending. This 3ft HDMI extension cable made better contact to the Optoma HDMI port and the projector was immediately able to detect HDMI signal. Hope this helps you... kaufmanekpr
SOURCE: optoma hd20 green light flashing
I think your mainboard is fried.
Had the same issue, but still didn't find a cheap way for a replacement. Optoma wants at least 400 € ...
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