Where do I purchase and how do I replace a picture lamp for a panasonic PT-56DLX75 56 in. HDTV Television ? I live near Sioux Falls, South Dakota.

If you have not replaced the lamp in this television at any time, it is probably in need of replacement. Lamp # is TY-LA1000. I buy lamps on e-bay from a company called niosales, excellent quality and free shipping. There are also three fans in your television, if the small fan near the DMD module fails the tv will not start ofr stay on. I really believe the lamp is your trouble though.
http://cgi.ebay.com/Panasonic-TY-LA1000-TYLA1000-NEW-PHILIPS-LAMP-CAGE-/390092304715?pt=LH_DefaultDomain_0&hash=item5ad350314b

main lamp needs replacing.....picture in picture is not processed the same.

You should have received a message on the screen about replacing the lamp. Also, the LAMP led on the front should be lit in red.
You can replace the lamp assembly easily for about $150 - $250.
Don't try to replace the bulb only.
A new Panasonic Plasma TV will cost about $1000 and good for another 5 to 6 years.

Do you hear the fan blowing? If not, you have another problem.
Also, check all the cables.

Hi to all Panasonic HDTV DLP PT-50LC13 owners i have this TV for Repair or Parts. It does,nt powerup i know the fix but i dont want it so is for parts for $100 bucks

Your model doesnt have a lamp. It has three picture tubes instead.

Go here and download the "Datasheet"

http://www.mcmelectronics.com/product/P-TY-LA1500#?gclid=CPzAv4627poCFQhhnAoduxTECA

You need to reset the lamp timer.
Hold the volume down button AND the Mute button on the remote for 5 seconds.

Your problem more than likely lies in your lamp. The whirring noise you hear is the ballast trying to fire up the bad lamp. The lamp part # for your set is TY-LA1000 and can be purchased online at vance baldwin. This is something you can easily replace yourself and your owners manual will give you instructions. Hope this helps

not really, just be careful about getting finger prints on the lamp as the oils from your fingers will shorten the lifespan of the lamp.