First, hang in there. We can probably get this back to normal operation with a little more effort. Second, don't be afraid of a little de soldering and capacitor replacement. Watch a couple of YouTube videos and you'll be an expert in no time. It's only slightly more advanced than turning a screw. Okay, how to find your power supply. See where the power cord attaches to the back of your TV? That first board is the power supply which "conditions" the electricity for use in the various parts of the TV. It will have about 3 various sized connectors, including a two wire lead that goes to the ballast (brown and blue) Pull your power supply and check your capacitors. IF the power supply is the problem, you can either buy a used one, get lucky and find a new one, or swap out the capacitors if you have a bad one. If you find bulging capacitors you know that that's the problem. If not, move on down the list of suspects. The TV may be turning itself off to protect itself. And the first suspect here is HEAT. Is everything CLEAN inside. Especially the fan blades and all the heat sinks? You may want to "hot wire" the thermostat switch that sits just above the lamp (by connecting white and blue to each other) or replace the thermostat switch with a new one. Costs about $2. Replacing your FANS may also be an option as they may be under performing and letting heat build up to the point that the TV shuts off to protect itself. Is the TV too close to the wall? Is it getting enough air? And it bears saying one more time, is everything inside CLEAN???