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Set will have a "HYPER" BOARD causing this issue----there was a service bulletin with a photo of the board with 10 surface mounted filter caps that dry out and need to be replaced.
The failing caps tend to begin to regain capacitance when hot---gradually the wait gets longer and longer.
Board no longer available from Toshiba so 3 choices: replace the caps yourself (tricky and not easy) or have it sent for rebuilt to PTS electronics (about 200) or go shopping for a new set and retire this one.
Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
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!
CK your hori output Transistor and small blue capacitor round it feed the hori output 2k high voltage cap if they are OK then Replace both of your STK ICs they will have part number on them. For Parts Call Mats 1-800-628-1118