First test the flyback if its good or bad. you will need a device to test with it or let it test at somewhere at electronic stores that will accept to test the flyback. if it is good troubleshoot your tv. good luck!
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A blue screen indicates no video signal, if you change the video input to a DVD player is it still a blue screen? If yes then the TV is defective. If no then some how the signal is being lost to the TV from whatever source you use for watching broadcast TV
DVD player into your TV and power on. Make sure you plug the right
component cables into their corresponding inputs on the back of the TV.
This is usually done by simply matching the colors of ends of the
cables with the colors of the input holes on the back of the TV.
Turn TV to the proper input to display the DVD. Make sure there is not a DVD in the player.
burn-in reduction screen saver DVD in the player. Allow a few seconds
for the DVD to start playing. A pattern of white "video snow" will
appear on your screen. The entire screen should be taken up with this
the DVD for at least several hours; this will help wear the TVs
phosphors evenly. Depending on how long the image has been burned into
the screen, the amount of time you should play the DVD varies a lot. A
good rule to follow would be to play the DVD at least four times the
period the image has been displayed. If you have an image that has been
on the screen two hours a day for a whole month, run the screen saver
for at least 240 hours
you have a flat screen, look on the back of the flat panel for digital in (yellow, white & red jacks). this will be connected to yes the DVD player. using your tv remote switch the source enable to watch a DVD. you comcast cable is still connected to watch this simply switch back to cable source..
It sounds like you have no signal being detected by the TV. Check your connections to the TV from your cable box or satelite reciever to be sure they're plugged in tightly. If you have a DVD player or VCR, try watching something from one of them to see if you get a picture. If you do, then your problem may be with your cable box or satelite reciever, and not the TV.