My Westinghouse flat screen TV won't show picture . All it says is no signal

The TV is not receiving a video signal. It is probably the cable you are connecting the tv to the source. If you are using an adapter, don't. Buy a proper cable.

The input signal is missing and the blue screen background comes on the screen. Change the input to some other device which you are sure works and see.

First when tapping changes the picture you have somewhere a bad connection; in electrical board or wiring.
When the screen goes blank after a while means some capacitor is bad/old.

Ur tv the LCD inverter board it dead.The LCD inverter is the board that help the LCD screen panel to get a backlight to produce a picture,the LCD inverter board is dead and it not working anymore that why u only get 8 sec.of the picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It a long board in shape.

westinghouse flat screen ...blue light on lower part...can not get to stay on tv and no sound...what button so i push to go back to tv

westing house flat screen tv hd...has sound no picture

I'm willing to bet it's the main board. Its the board that all the video and audio inputs. What is the model number I could find the part for you. You could change it out yourself, Its not that hard. Let me know.

There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

HELLO MAKE SURE ALL THE CONNECTOR CABLES ARE TIGHT ON THE MAIN BOARD IF THEY ARE OK CHECK THE INVERTER BOARD FOR DRY JOINTS GOOD LUCK

SHAUN

Some solutions to this same problem were posted here, hope this helps.