Toshiba shuts dowm

Something is causing the TV shut down or go in to 'protect' mode.
It is unusual to actually hear a component inside the TV go bad, but you obviously did. Probably in the main power supply or something that normally uses a higher voltage in the TV since you heard it..

The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Replace the IC's with STK 392-110T.
Toshiba has a Service Bulletin on this problem.

Good Day,lizbg;
Check the solder connections at the negative side of both C809 and C810. Resolder if necessary. This a common problem with model.
Good Luck, Big Irish.

You need a new bulb

sound like to me caption 1 is turn on .. try going into settings menu and shutting off close caption...

please post your model number I have a link that has a toshiba power supply and shut down circuitry troubleshooting manal. Toshiba is one of the easiest power supplies to shoot

What is the model number?

If your set all of a sudden won't come on, e.g., the screen is blank, but the LED on the under the screen next to the on/off switch keeps flashing, then there may be an internal fault on the set that needs to be reset.
To force the reset, try this:

• Unplug the set and wait a few seconds
• Replug and see if the video returns

Whenever the set senses an internal fault through its monitoring circuitry, it essentially shuts down the set. The flashing LED provides the indication that a fault has been detected. Removing power to the set resets the monitoring circuitry. When plugged back in, the circuitry again does a check of the system. If it finds that there truly is a problem, then the set is shut down and the LED will again flash. In this case, you need to call a service tech. Most of the time, however, the unplug/replug routine is enough to get the set up and running.

my guess would be flyback however your lucky you might be able to see a burnt spot on the board giving you a better clue.