Tv Comes On For A Split Second, Picture Goes Black But Sound Remains!!

there is two possibilities, either one of the lamps (florescent back lights behind the LCD screen. one of those inside he LCD panel) fail to light and the inverter senses it and shuts them all off, or the power supply has bad filter capacitors.

Look at the picture when the back lights light up for the split second. watch to see if you can notice a darker horizontal band indicating which lamp is failing to work. The problem is either the lamp or that section of the inverter that controls that lamp. A technician can check the inverter to see if it's a lamp or inverter The inverter is available separately, while the lamps will require a complete panel (very expensive and not worth repairing).

If you don't see a darker band then: remove the back and check for capacitors on the power supply that has the top puffed up slightly. If you find any, replace them. These parts (capacitors) are available at places like Radio Shack. you can either replace them yourself, or take the power supply board and the capacitors to a local TV shop and they will likely charge $20 to replace them for you. The power supply is the module that the AC cord plugs into, and the value of the capacitors is printed on the side. Normally the bad ones are rated at 10vdc-16vdc and they could be 1000 to 2200 micro-farads. These capacitors will look like a cylinder with a silver top. Google bad capacitors on LCD HDTV and you will see massive amounts of data.