LN-R268W picture is gone but the red dot is still on.

Go through the setup program again to scan channels, check the connection on the set for damage and looseness

There is some shorted component/s in the circuit broad inside. The set goes protection mode [short circuit]; as your reports here. To detect the actual fault point and board is a skilled work. must have through knowledge in electronics, and experience to work with these modes TVs.

hi my lcd ic problem 8 pin z1021hai thise no finde in market please that ic matching number ic solve me thank you

If its under waranty take it back and get a replacement

If you are refering to signal you receceive on an antenna, then yes. It's actually called a Digital Tuner. The standard analog tuners that are in most older TV's will work for the Analog signals that you will probibally still be receiving, the Digital signals will not be available to you. This will depend on if stations in your area are at transmitting in Digital or analog or both. These boxes are the devices the government was either giving away, or making availalbe for a low cost to those whom need it via cupons. This has ended, but you can check this gov site out that talks in detail about it. You can buy the Digital Tuner boxes for pretty cheap from what I havce seen, but you will probibally need an antenna also.

when you try to use your hdmi cable do you have the component your trying to use on? because the tv might need it to be powered up to recocnize the signal that, that input is in use

I have the same problem and when I phoned the local authorized Toshiba Dealer. They said it could be the main circuit board or the board that drives that board. Estimated cost of boards $200.00 to $500.00 !! If its the plasma itself then it is not even worth repairing, cheaper to buy a new tv... Great eh? NOT !

u need a main signal board replacement

when it blanks out, tuen the lights out in the room, and shine a flash light at the screen, see if you can see the picture, if you can, it is the inverter moard blamking out, thats the board that lights the back lights, if you cant, hit the input button on the remote, if the TV comes back with a picture, it is a problem with the main board, in paticular the componant input on the main board

you have no deflection and don't leave the dot on to long it will burn the crt's.