My westinghouse tv tx-42f430s only shows w for 2 secs. only power button works.

SOURCE: westinghouse tx-42f430s won't power on

More likely it's because of power circuit of your TV set. If you are not trained enough in repairing TV sets, appeal to your local repair center

SOURCE: my 42 inch westinghouse wont turn onDTV 1080p TX-42F430S

If you are referring to that you are unable to select the the 1080p setting in the TV menu, first try changing the aspect ratio in the TV Menu.
If that does not do it, you have to change the display setting ion your device, if you can not or it does not have 1080p the problem is that resolution is unsupported by your device

SOURCE: Westinghouse model tx-42f430s won't power on

That problem is usually have 2 causes..Its either power supply board or main board..

Please take this steps on how to determine the problem:
1. Open the back cover.
2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..
3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..
4. If the power supply output is normal..The problem could be on the main board...
5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..
6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..
Hope this solution will be helpful..

Thanks for using fixya...