The problem is with the DM module. Usually replacing the 6 1000microfarad caps fix it. But sometimes the DM module needs to be replaced or worked on a bit more. Other parts that are to be checked are Horizontal output transistor(HOT) and flyback. You can click here to have an idea about fixing it. It is not of your model but a similar one.

Flyback is used to generate high voltage to control the movement of electron beam in the CRT. Horizontal output transistor drives the flyback. These parts are not recommended to be replaced by end-user without proper skills and schematics as these sets have high voltage in them and need to worked on very carefully. Also sometimes the HOT gets shorted again and again even after getting replaced if they are not placed carefully on the heat sink.

If you want to repair it yourself then you should be having proper knowledge about the internal circuitry of the TV.
You should also require a multimeter and soldering equipments and schematics. I'm sorry there is no easy fix or press-a-button fix. This is an internal failure. If you wish to take it to a repair shop it would cost you around $350(unless it is a weak CRT). You can use http://national.citysearch.com/ and search for "TV Repair"(without quotes) in your area. Or you can use http://www.tvrepairpros.com/
Now it depends on how long you have used the set, because that will help you determine whether to repair or replace the set. If the set has never shown any problems earlier then I'd say repairing could be worth it. If you have any queries then I would be glad to assist you further. Now I know this is not the best answer, but like I said, there is no easy fix as this is internal failure.