Toshiba theaterview HD 52" has black box on screen

This is lamp of your tv (lamp with housing) that you will see inside tv.
Click Toshiba Support to download user manual copy and check page-50 to 52 for lamp replacement instructions.
Thanks.

Look for bad stk's on convergence module. This may take care of pincushion too.

THanks

Unplug the power to the TV and HD cable box, wait 5 min. Plug TV and HD cable box back in.Everything is working like new. Go figure.

in the customer menu--find the closed caption settings---you will most likely find the set has been set to TEXT 1---with the remote select either CC1 or OFF---the black box was for text (books) and was not ever used much---usually someone engages it by accident

You have inadvertently activated one of the closed-caption modes called T1 or Text 1. Find out how to turn the closed-captioning off and on and you'll be able to turn this off.

On my toshiba I just use the input button on remote.

yes its on your remote. its the c.capt button. or go under menu/enter and pan to the left untill it comes up. and turn it off by scrolling through the caption buttons

could it possible be a problem with closed caption setting....is this a square or rectangular box how big?

You should have 2 cables going into the Sky HD box not just 1

I have the same tv and had it fixed the problem is most likely the power supply a $50.00 part but I suggest you have a repairman do the fix. Total cost should be around $250.00 for labor and parts.Also unplug your tv for over 4 hours then plug it back in to see if it works they call this a hard reset.If this does not work after 4 hours try unplugging it overnight and then try it. That is what I did to use the tv until I got it fixed. The only thing it could be is the convergence circuitv if this is the case it should cost about $400.00