After warm-up screen flashes and loses color but comes back on and off intermittidly. This is a 50" Zenith Plasma tv. thanks.

This could be caused by multiple things. The first problem that comes to mind is a bad power supply in my experience. The second problem that comes to mind is possibly a bad t-con or backlight inverter board. Could you tell me, when the TV powers back off can you see a picture in on the screen if you shine a flashlight up to the display?

TV type ......................plasma TV
Screen size ..................50 in
Viewing Angle ....................160 degrees
Color .......................dark silver, silver
Video............. Interface Component, composite, HDMI, S-Video
PC Interface ..............VGA (HD-15)
Timer Functions................ Sleep, wake
HDMI Ports Qty ...................1 port(s)
Power Consumption Operational .................450 Watt
www.electro-medical.blogspot.com

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.

Flashing error codes could be the Direct tv box itself.Because tvs have problems within itself don't flashes error codes on the tv screen,the problems,just show up.Tries tv and Direct tv satellite box unplug,replug it back like about an hour later.By letting the tv resetting itself back to the factory setting and the Direct tv box updates it softwares data's.The problems should be solved,if have the same problems,first call Direct tv for a replacement box,see how it work out.Than turn ur attention to the tv.

While watching, TV made a sharp bang sound. Sound Problem with the Zenith Z50PX2D 50 in. HDTV Plasma Television While watching, TV made a sharp bang sound. Sound still good, channels can be changed, but no screen, now tv wont come on at all?

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.

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

try inspecting all caps to see if anything poped out the top or leaky. if none, try replacing the zsus, ysus and upper and lower driver boards. must do all at the same time.

does it look like this:
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm