Check and make sure you are on tv not video. Unplug and replug all the game systems or other things you might have plugged in your tv.
And if those don't work make sure you are not on input channels (input1, input 2, and do on). If still you are having problems go to the tv menu and and make sure you are on antenna if you have a antenna or cable or satilite if you are on one of those. I hope this helps!
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check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.----
a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.----
with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT.
excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen.
check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines.
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It has been my experience with Sonys that those three colored lines indicate that the set is having trouble with the data communication lines. The hitch is that a model as complex as that one has as many as five seperate clock/data lines and if any one of them goes down the set will exhibit your symptom. It will take a professional to track down which line is causing the problem. I've seen audio output IC's as well as tuners cause the problem.
Sorry about your issue, however, LCD's do not have a lamp, they have a back light but the chances that is bad is a million to one. I strongly recommend taking it in for an evaluation. I understand your feelings that it should last 5 years or so, however I see every brand, a year or two old with these types of issues. The day's of no problems for 5 yrs up to 20 are definitely over. This is technology at it's finest.
A "Gray Scale" adjustment may solve you problem.
If one of the picture tubes is set too high it will cause these RETRACE lines.
Then too a weak picture tube might cause this.
If the horizontal lines are one color: red, green,or blue then whichever color that is shown would tell you which tube is set too high.
Your set has 3 screen controls that control the brightness of each tube. One may need to be turned down a little.