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Replace the CRT base connecting socket. It is bad.[Corroded Focus pin connection]. Can be located at the CRT base card.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
That is a drawing number for the IC itself. I will need the model of the TV and the location number for that IC to be able to look up the Toshiba part number. The location number will be silk screened onto the pc board where it came from.
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There are many regulator IC in TV you can find it easy the commonly used are 3 pin part number is 4 digit example LM7809/AN7809 this means possitive ic regulator 9v output. LM7909/AN7809 means neg. output 9V. so you can search it on your board. Good Luck
If you can see the menus this means the CRT, high voltage, scan amplifiiers, the output video processor, and CRT drive circuits are working. The fault is most likely in the video section of the input select circuits.
Maybe the Toshiba parts department can supply a service manual for your set. With a signal source, a scope, and a DVM, an experienced technician can troubleshoot your set to locate where the failure is occuring.
I have not serviced this model, but in other models I have found the main input select IC to be defective. In some cases I also found a bad voltage regulator IC that supplies the input section has failed.
are you sure that you are checking this correctly? What is the location number for this regulator? If its the main regulator, what are you using for ground on your meter? Also, isn't the part number marked on the regulator?