Toshiba 46H83 won't turn on...replace bulb???

I think the screen adj is too high on one of the screens.
How and where did you touch focus?

www.aaatvservice.com

Presuming bulb was installed correctly it could be the ballast that powers it.

If possible try to look from outside where lamp is to see if it even fires up for a few seconds.

you more than likely have a bad panel inside of your tv. you can have someone repair it but it's not recommended as it's pretty expensive. You should just invest in a new tv.

the red flash you are talking about im assuming is the screen going red
that usualy means a red picture tube they break down
one way to tell turn the red screen control counter clockwise and see if you can control the tube gain
and then you can lightly tap on crt neck and i do mean carfuly and see if it flashes it most likely will and you would need to change the crt and reset it up

only fuse I know is near back of tv inside power section right next to the power cord input ... my first thought tho is damaged capacitors inside same area ... good luck getting it apart ... I took mine apart but difficult to figure how

if you are using an areal for your tv move your areal and see if it works or do the tuning for it .

make sure tv not in standby mode

It sounds like a bulb. I would call toshiba and ask them what the replacement part is for that. I briefly googled for it but couldn't find the matching bulb for the 46H83