Viewsonic PJ558D shuts off after a few seconds

NOPE U NEED TO REPLACE COLOR WHEEL

Look to the color wheel for your problem. They do wear out.

If the yellow is perfectly uniform across the whole screen, then a processor problem may be present.
If the lamp is very old then this could be a problem.
Otherwise an optical part has deteriated due to overheating

take it to a repair shop

i have the same problem, been workign on it for a week now... someone says the color wheel might be off thus, noit detecting the correct RPM of the color wheel, and you will have to open the machine up and re adjust by hand. im about to take it apart now... wish me luck

Not for a while yet. You'll need to use the "standard" lamp. Do not forget to reset the lamp timer when you change the lamp.

it is called a color wheel, and you can buy it on-line from the viewsonic website:

http://store.viewsonic.com/html/vsc_ibePPSerialNumSrch.jsp?minisite=11174&site=&respid=52561&language=US

The color wheels for these projectors can run anywhere from $50-$150 plus installation. With projectors now in the 3-400 range it may actually cost less to replace instead of repair.

The 4805 Color wheel part number is 525-0146-00

You can buy it from AV SOLUTIONS in NY

As far as if it's worth it... That's up to you.

I've encountered this same issue. I had a large Yellow Line down the left side of the screen for a few months. It got bigger and bigger, then one day I was using it and Bam! What sounded like a fire cracker was my color wheel exploding. I also had the rubbing sound, or at least something similar to that sound prior to the explosion. InFocus quoted me about $300 to fix..