My plasma tv automatically shuts off when you turn it on.....the receiver stays on where the volume is controlled...however the tv monitor and box turn off from green light to red light.....sometimes the tv will stay on for a brief amount of time half and hour to an hours...the last couple of days...the tv shuts off as soon as the screen comes on. Please help.

SOURCE: 42 inch plasma

TURN OFF THE MAINS AND THEN SWITCH IT BACK ON

SOURCE: PLASMA DISPLAY STARTING UP. PLEASE WAIT

Un plug the power to the Plasma Screen and also to the Media Receiver for ten minutes. Disconnect the off the air antennas both A and B. After ten minutes plug in the plasma screen then the media receiver and turn on wi the remote control. You should now be back in operation. I was.
Also It may not be a bad digital tuner. The TV Guide feature is active even when the zip code is set to all 0s so if you have an over the air antenna attached the TV will look for the TV Guide info and if it can not find it because of a weak signal or the chanel it is tuned to does not carry that information the TV thinks that tuner does not work which triggers the 12 flashes. Also on power up the gray box with the waring message "Plasma Display Starting Up, Please Wait" appears and the screen is blank.

SOURCE: Panasonic TH50PH10 Turn off Automatically

Hi, if your plasma flashes 10 times it means that there is a problem with the sustain driver. This could be an intermittent problem, such as when the set heats up. It should be returned to the dealer as it is under warranty.

SOURCE: Screen lower half goes black/blank

The lower "Y Buffer" board is defective. Best repaired by a technician, or contact Phillips support for the part if you think you are able to replace a small circuit board on your own.

SOURCE: Green spots/pixels at top of TV screen

I have a 50" Pioneer PDP-503MXE with the same problem - the fans don't run. It appears to be a problem with the temperature sensor that controls the fan speed. However, the fans can manually be switched to MAX.
To do this, put the display in standby. Press the 'Menu' button and within 3 seconds press the 'Power/Standby' button. The 'Integration Menu' will appear. Select the 'Option' tab on the right. Scroll down (next page) to the 'Fan Control' option. It will most likely be set to 'Auto'. Press 'Set' to change it to 'Max'. Within a few seconds the fans will run.
At Max the fans are a bit noisey but it will cool the unit down.