Red screen Tv worked fine in the morning. Turned back on and only get a red screen. Channels work ok and audio is fine as it changes with channels. Any ideas.

If the picture is OK then check your sound cables, red and white if analog, or swap out the HDMI cable with one that you know works.
Also, on the SETTINGS screen make sure your audio is set to stereo not surround sound.

Check the antenna/cable line going to your tv. You may have to go outside your house to investigate.

your tv board was crashed, change with new one

Your SAP/MTS function is most likely turned on. This feature has 3 modes: Stereo, Mono and SAP. Stereo and Mono are easy to understand, it's the SAP that can get you. SAP stands for Second Audio Production. It is used to provide weather, information or an additional language translation of a program. Some broadcasters simply transmit the mono audio over the SAP audio channel when the are not using it for other purposes. Other broadcasters simply do not use it, which does not give you any audio. Look on your remote for a SAP or MTS button. If you do not see one, look in your TV user menu for this feature. If you are using a cable box, look in the audio menu of the cable box. You are looking for something set to SAP... just change it to STEREO. I hope this was helpful.

No. You probably have a bad Cable Box.

I did not fix the problem, but you have the model number wrong, it is KP-46WT510

I do need some help.

check the following power supply components
power transistor of the supply
zener diodes
rectifier diodes

hi, see if the right funtion is selected, tv, vcr, dvd.then if that does not help, get a universal remote. they don't cost alot or some don't good luck. hope this helps.

http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

I called westinghouse with a similar problem(my picture shows up but all the white turns blue or somtimes pink).
they say the problem is similar to that of the xbox 360's red ring of death problem. Now what needs to be done is the unit needs to be unplugged completely for about 30 minutes. this allows the unit to completely cool down. and when the unit restarts and heats up the troubled connections will reflow and all will be fixed.
I tried this and it worked well for my TV. but it is only a temp fix and will need to be done again if the problem occurs.