Sony KP46WT510 picture goes back and fortto horizontal color bars

Hi,Yes your problem sounds like the DMD board.This is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Here's a video that will help you find where the DMd chip is located : http://www.youtube.com/watch?v=0jr_9A5Xd2Q Have a blessed one!

Sounds like the CRT tubes are going out which is fairly common on Sony. Inside the back of the TV there are 6 knobs - 2 for each color...one is for focus - dont touch - the other for brightness...turn down the brightness just a hair untill the lines go away.

This could be from 2 things. 1 is the optical block is going bad or 2 you got a peice of dust blown in from the cooling fan and its blocking the color filter internally. If you are capable you can take the tv apart and blow compressed air into the color block and remove the dust. Hope this helps

you can fix it with the KP46WT510 convergence repair kit at the following link as your model uses the same kit as do most Sony models, The kit contains the ICs , PIco fuses and 4 of the resistors plus free instructions.
http://servicemanuals.vstore.ca/

you van get the repair kit at the following link which has both convergence ICs, the six pico fuses and four of the feed resistors plus the instructions on how to do the repair.
http://servicemanuals.vstore.ca/product_info.php/pName/sony-kp46wt510-convergence-repair-kit/cName/convergence-repair-kits

Hi Veronica,
I need to know exact model number of your Toshiba TV to help you out.
You can find it at back of TV on some kind of sticker.

Good Day petepath7;

With separation of colors it sounds like the convergence IC's have failed., but first try unplugging TV from a/c power for 4-5 minutes then plug back in, if no fix see previous.l

check your menu settings if not there then you may require board level service.or eprom sub menu adjustment.

Your set is starting to get a convergence problem and the only way to repair it is by changing the convergence IC's,(3)one for each color,the blue migh be showing more now but soon all 3 colors will be out of alignment and you will not be able to correct it with the custumer controls,is great that it has worked for so long without this problem,if you are familiar with tv service you have a place to check but if you are not too familiar be safe and call for help from a pro-servicer.Let Us know how it goes.

Have you taken another set an hooked up the cable or sat. to the other tv from this tv? Try that first thing. Next try the video input like with a dvd or vcr. No lines ?? Then sounds like the tuner could be going bad in this set. if you still have lines then its a problem in the video or horizontal section in the tv set. There are no user serviceable parts inside this set so its anot advised to gointo this set to try to fix it. You can get a serious shock or cause more problems with the set. I know you said it is about 5 or so years old. Its at the point of do you wanna invest in this set?? If you really like the way it works then a tuner shouldnt (if thats the problem) run more then 2 to 3 hundred bucks with the labor. Good Luck