After some Googling, I discovered that my particular model (SK-19H210S) is notorious for this exact problem. Every review I read told the same story: "It lasted a year and then died! Westinghouse told me I was S.O.L.!"
Time to break out the ol' screwdriver and take a peek under the hood.
My first suspect was the power supply board. Possibly just a blown fuse? After taking the TV apart, and inspecting the power supply, I found the culprit: a bad 2200uF capacitor. One lousy capacitor goes and the whole darn TV is useless! Sheesh...
I have a sneaking suspicion that Westinghouse bought a got bad batch of capacitors that only lasted for a year. If I am correct, than replacing this one little part could revive your poor little TV!
These instructions are intended for only this specific model of TV. Even if you do have the same model, it is still possible that the problem is something completely different. It might be worth a shot though. The worst you could do is break it. If its already broken then whats the difference?
A word of caution: You may encounter high voltages! Capacitors can store a lot of electricity. It is a good idea to discharge capacitors by shorting out their leads with a plastic handled screwdriver. Wear safety glasses while doing this!
Multimeter (for checking faulty components)
Plastic pry bars (For getting the case apart without scratching it. An old credit card might work too. Try a butter knife if you don't care about scratches)
Towel (to keep the screen from getting scratched)
Hammer (for if it doesn't work and you get frustrated)
One 2200uF 16v Electrolytic capacitor
Aluminum foil tape (duct tape or Gorilla tape might work in a pinch)
FREE (if you scrounge, $3 at the most if you don't)
If you have all the tools, then all you need is the replacement capacitor. I scrounged one from my pile of electronic junk.
If you don't have one on hand, try a local hobby shop or RadioShack. I did a quick search on eBay and found a lot of 5 for $2.50 including shipping.
Just make sure that the one you're using is a 2200uF electrolytic capacitor with a 16v working voltage.
Step 1: Case Disassembly
If you are an experienced TV-disassembler, skip to step 7.
It helps to keep small parts in a dish or a cup.
Taping screws to a piece of paper and writing notes helps you remember where they go.
Marking or labeling parts and wires as you take them apart is helpful when it comes time to reassemble.
First, remove the front speaker cover by prying it downward. It is just snapped on, no screws.