Piece of Junk - Zenith Plasma Z50PX2D

these can be a bit costly. I would call around and get a few prices. It maybe cheaper to buy a new set.
good luck

LG Inside.

Needs either a Y-Sustain or a Z-Sustain.

Whichever has the blown fuse inside.

Its not the CRT, its the Y Sustain board.. This happened to mine 30 minutes ago.. and has happened to every owner of a plasma tv that uses the toshiba Y Sustain board..

if you have had it less than 2 yrs still in warranty

Please take the time (5 min) to file a complaint with www.consumeraffairs.com...you will see that you are not the only one with this exact same issue on this zenith plasma model Z50PX2D:
http://www.consumeraffairs.com/search.html?cx=partner-pub-0200629403145096%3Aqt7mbbqybbg&cof=FORID%3A10&ie=ISO-8859-1&q=zenith+plasma+#1124

it's your power supply that has gone. I had the same problem after owning my LG Z50PX2D for 2 months. The repair shop had it for 6 months. now I have the famous "POP & BLACK SCREEN SICKNESS" LG/Zenith should fix this.

bad upper, lower y sus & z sus pcb about 800 to 1000 to fix 

My TV has a picture but its very poor quality and its fading ,blurry color it is not clear what can i do to fix.Thanks

Did it make a pop noise first?

Check your input connections, especially the HDMI (if in use). I have found through personal experience that the weight of the cable and any small vibration can be enough to loosen the connection and leave you a blank screen. The manufacturers would have been smarter to have all the inputs face toward the floor at the bottom of the set (like the power cord). Anyone who has mounted their set to the wall will understand what I am saying.
That being said, you may be better off saving your money and buying a new LCD TV. The Zenith sets have proved to be a ticking bomb. If you Google "pop" and "z50px2d" you will read a number of posts on various boards that indicate that the Zenith plasmas have about a 2 year life expectancy before they are in need of some very expensive service. And frequently even after they are serviced are prone to further failure.
Someone pointed out to me not to long ago a valid fact: LCD technology has been around since the pocket calculator and therefore much less prone to unexpected failure than the relatively new plasma technology. I just wish someone had told me that 2 years ago when I ponied up $3000 for my Zenith z50px2d that blew out a few days ago.