1999 toshiba CZ36T1 blacks out for hours then comes back on.

try removing the battery and leaving it for half an hour, refit the battery and see if it fires up then.

unplug the set for a half hour and start over. As long as you did not save the settings, all should be ok.

Those flashes are fault indications. http://electronicshelponline.blogspot.com/ Visit the site linked here to get more details. Search the site by type in the brand name of your device in the search box at the top right of the display window to get gathered all the related posts.

Your TV is 10 years old. There is no lamp to replace. There is a board inside the TV that controls the back light. It's called the ballast board. TV Parts Universal TV Stands DLP Chips ShopJimmy You might be able to get one here.

convergence repair needed

Try resetting the TV by leaving it unplugged for an hour.
Plug it back in and check to see if it works normally.
If that doesn't work, rule out the Directv box by pressing the reset button near the access card. The box could be putting out a signal that doesn't have video or audio.
If everything fails, have the tech man come back to check everything that he did before you use the warranty on the TV.

if this is a old unit the there is serious problem with the display.

check how many times the light blinks and get back to us.

How do you know when your light bulb has burned out? I have sound with a black screen

unplug the laptop, remove the battery, wait 15seconds, put the battery back, plug it back in.

If it doesnt work after this.

Drop me a line and il give you more assitance.

There could be bad solder connections on C809 and C810. There was a technical bulliten on this problem a while back agao. good luck