Originally Posted by m335i
Okay i am having problems with my Optima HD20 Projector. I bought it refurbished. It worked great for about a year has about 2500 hours on bulb now. When i turn it on it works great color is great and picture is great, but after about 15-20 mins the color starts to look like it has high contrast or something and it starts looking greenish purple. If i leave it on it will start to flicker and color will be all over the place like rainbow
... Anyone know what this might be? What could i do to fix it?
Mine (just over 3000 lamp hours, 6 of those 'bright') has started doing similar. Colors are clipping. At first I thought it was an issue with certain broadcasts because it only happened and was apparent on deep reds (like those commonly seen on a certain network's Sunday evening cartoons). It slowly got worse and became more apparent. Lowering the brightness and/or R/G/B gain/bias settings made it less so, leading me to believe that there is clipping occurring in the circuitry that does the balancing/biasing (analog?). I tried recalibrating it and this didn't help (in fact, it seemed the reds were way off and the other colors were off a bit as well). Shutting it, letting it cool, blowing out the dust, then bringing it back up didn't appear to help much either. Resetting factory defaults made it seemingly better but it still has issues. Grey steps show a different color tint at each level, so something has clearly gone non-linear and biases are likely off.
Has anyone had this issue before and found a solution? Bad caps? Burnt transistors?
Is there anywhere that is familiar with these that performs repairs for a reasonable fee?